archie/tk4.2/generic/tkCanvas.c

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/*
* tkCanvas.c --
*
* This module implements canvas widgets for the Tk toolkit.
* A canvas displays a background and a collection of graphical
* objects such as rectangles, lines, and texts.
*
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* Copyright (c) 1991-1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkCanvas.c 1.119 96/03/21 11:26:39
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*/
#include "default.h"
#include "tkInt.h"
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#include "tkPort.h"
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#include "tkCanvas.h"
/*
* See tkCanvas.h for key data structures used to implement canvases.
*/
/*
* The structure defined below is used to keep track of a tag search
* in progress. Only the "prevPtr" field should be accessed by anyone
* other than StartTagSearch and NextItem.
*/
typedef struct TagSearch {
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TkCanvas *canvasPtr; /* Canvas widget being searched. */
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Tk_Uid tag; /* Tag to search for. 0 means return
* all items. */
Tk_Item *prevPtr; /* Item just before last one found (or NULL
* if last one found was first in the item
* list of canvasPtr). */
Tk_Item *currentPtr; /* Pointer to last item returned. */
int searchOver; /* Non-zero means NextItem should always
* return NULL. */
} TagSearch;
/*
* Information used for argv parsing.
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_BORDER, "-background", "background", "Background",
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DEF_CANVAS_BG_COLOR, Tk_Offset(TkCanvas, bgBorder),
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TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
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DEF_CANVAS_BG_MONO, Tk_Offset(TkCanvas, bgBorder),
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TK_CONFIG_MONO_ONLY},
{TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
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DEF_CANVAS_BORDER_WIDTH, Tk_Offset(TkCanvas, borderWidth), 0},
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{TK_CONFIG_DOUBLE, "-closeenough", "closeEnough", "CloseEnough",
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DEF_CANVAS_CLOSE_ENOUGH, Tk_Offset(TkCanvas, closeEnough), 0},
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{TK_CONFIG_BOOLEAN, "-confine", "confine", "Confine",
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DEF_CANVAS_CONFINE, Tk_Offset(TkCanvas, confine), 0},
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{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
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DEF_CANVAS_CURSOR, Tk_Offset(TkCanvas, cursor), TK_CONFIG_NULL_OK},
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{TK_CONFIG_PIXELS, "-height", "height", "Height",
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DEF_CANVAS_HEIGHT, Tk_Offset(TkCanvas, height), 0},
{TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
"HighlightBackground", DEF_CANVAS_HIGHLIGHT_BG,
Tk_Offset(TkCanvas, highlightBgColorPtr), 0},
{TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
DEF_CANVAS_HIGHLIGHT, Tk_Offset(TkCanvas, highlightColorPtr), 0},
{TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
"HighlightThickness",
DEF_CANVAS_HIGHLIGHT_WIDTH, Tk_Offset(TkCanvas, highlightWidth), 0},
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{TK_CONFIG_BORDER, "-insertbackground", "insertBackground", "Foreground",
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DEF_CANVAS_INSERT_BG, Tk_Offset(TkCanvas, textInfo.insertBorder), 0},
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{TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
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DEF_CANVAS_INSERT_BD_COLOR,
Tk_Offset(TkCanvas, textInfo.insertBorderWidth), TK_CONFIG_COLOR_ONLY},
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{TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
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DEF_CANVAS_INSERT_BD_MONO,
Tk_Offset(TkCanvas, textInfo.insertBorderWidth), TK_CONFIG_MONO_ONLY},
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{TK_CONFIG_INT, "-insertofftime", "insertOffTime", "OffTime",
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DEF_CANVAS_INSERT_OFF_TIME, Tk_Offset(TkCanvas, insertOffTime), 0},
{TK_CONFIG_INT, "-insertontime", "insertOnTime", "OnTime",
DEF_CANVAS_INSERT_ON_TIME, Tk_Offset(TkCanvas, insertOnTime), 0},
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{TK_CONFIG_PIXELS, "-insertwidth", "insertWidth", "InsertWidth",
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DEF_CANVAS_INSERT_WIDTH, Tk_Offset(TkCanvas, textInfo.insertWidth), 0},
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{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
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DEF_CANVAS_RELIEF, Tk_Offset(TkCanvas, relief), 0},
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{TK_CONFIG_STRING, "-scrollregion", "scrollRegion", "ScrollRegion",
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DEF_CANVAS_SCROLL_REGION, Tk_Offset(TkCanvas, regionString),
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TK_CONFIG_NULL_OK},
{TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
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DEF_CANVAS_SELECT_COLOR, Tk_Offset(TkCanvas, textInfo.selBorder),
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TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
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DEF_CANVAS_SELECT_MONO, Tk_Offset(TkCanvas, textInfo.selBorder),
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TK_CONFIG_MONO_ONLY},
{TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
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DEF_CANVAS_SELECT_BD_COLOR,
Tk_Offset(TkCanvas, textInfo.selBorderWidth), TK_CONFIG_COLOR_ONLY},
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{TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
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DEF_CANVAS_SELECT_BD_MONO, Tk_Offset(TkCanvas, textInfo.selBorderWidth),
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TK_CONFIG_MONO_ONLY},
{TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
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DEF_CANVAS_SELECT_FG_COLOR, Tk_Offset(TkCanvas, textInfo.selFgColorPtr),
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TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
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DEF_CANVAS_SELECT_FG_MONO, Tk_Offset(TkCanvas, textInfo.selFgColorPtr),
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TK_CONFIG_MONO_ONLY},
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{TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
DEF_CANVAS_TAKE_FOCUS, Tk_Offset(TkCanvas, takeFocus),
TK_CONFIG_NULL_OK},
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{TK_CONFIG_PIXELS, "-width", "width", "Width",
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DEF_CANVAS_WIDTH, Tk_Offset(TkCanvas, width), 0},
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{TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
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DEF_CANVAS_X_SCROLL_CMD, Tk_Offset(TkCanvas, xScrollCmd),
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TK_CONFIG_NULL_OK},
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{TK_CONFIG_PIXELS, "-xscrollincrement", "xScrollIncrement",
"ScrollIncrement",
DEF_CANVAS_X_SCROLL_INCREMENT, Tk_Offset(TkCanvas, xScrollIncrement),
0},
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{TK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
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DEF_CANVAS_Y_SCROLL_CMD, Tk_Offset(TkCanvas, yScrollCmd),
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TK_CONFIG_NULL_OK},
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{TK_CONFIG_PIXELS, "-yscrollincrement", "yScrollIncrement",
"ScrollIncrement",
DEF_CANVAS_Y_SCROLL_INCREMENT, Tk_Offset(TkCanvas, yScrollIncrement),
0},
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{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* List of all the item types known at present:
*/
static Tk_ItemType *typeList = NULL; /* NULL means initialization hasn't
* been done yet. */
/*
* Standard item types provided by Tk:
*/
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extern Tk_ItemType tkArcType, tkBitmapType, tkImageType, tkLineType;
extern Tk_ItemType tkOvalType, tkPolygonType;
extern Tk_ItemType tkRectangleType, tkTextType, tkWindowType;
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/*
* Various Tk_Uid's used by this module (set up during initialization):
*/
static Tk_Uid allUid = NULL;
static Tk_Uid currentUid = NULL;
/*
* Statistics counters:
*/
static int numIdSearches;
static int numSlowSearches;
/*
* Prototypes for procedures defined later in this file:
*/
static void CanvasBindProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static void CanvasBlinkProc _ANSI_ARGS_((ClientData clientData));
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static void CanvasCmdDeletedProc _ANSI_ARGS_((
ClientData clientData));
static void CanvasDoEvent _ANSI_ARGS_((TkCanvas *canvasPtr,
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XEvent *eventPtr));
static void CanvasEventProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static int CanvasFetchSelection _ANSI_ARGS_((
ClientData clientData, int offset,
char *buffer, int maxBytes));
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static Tk_Item * CanvasFindClosest _ANSI_ARGS_((TkCanvas *canvasPtr,
double coords[2]));
static void CanvasFocusProc _ANSI_ARGS_((TkCanvas *canvasPtr,
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int gotFocus));
static void CanvasLostSelection _ANSI_ARGS_((
ClientData clientData));
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static void CanvasSelectTo _ANSI_ARGS_((TkCanvas *canvasPtr,
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Tk_Item *itemPtr, int index));
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static void CanvasSetOrigin _ANSI_ARGS_((TkCanvas *canvasPtr,
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int xOrigin, int yOrigin));
static void CanvasUpdateScrollbars _ANSI_ARGS_((
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TkCanvas *canvasPtr));
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static int CanvasWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
static int ConfigureCanvas _ANSI_ARGS_((Tcl_Interp *interp,
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TkCanvas *canvasPtr, int argc, char **argv,
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int flags));
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static void DestroyCanvas _ANSI_ARGS_((char *memPtr));
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static void DisplayCanvas _ANSI_ARGS_((ClientData clientData));
static void DoItem _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Item *itemPtr, Tk_Uid tag));
static int FindItems _ANSI_ARGS_((Tcl_Interp *interp,
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TkCanvas *canvasPtr, int argc, char **argv,
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char *newTag, char *cmdName, char *option));
static int FindArea _ANSI_ARGS_((Tcl_Interp *interp,
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TkCanvas *canvasPtr, char **argv, Tk_Uid uid,
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int enclosed));
static double GridAlign _ANSI_ARGS_((double coord, double spacing));
static void InitCanvas _ANSI_ARGS_((void));
static Tk_Item * NextItem _ANSI_ARGS_((TagSearch *searchPtr));
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static void PickCurrentItem _ANSI_ARGS_((TkCanvas *canvasPtr,
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XEvent *eventPtr));
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static void PrintScrollFractions _ANSI_ARGS_((int screen1,
int screen2, int object1, int object2,
char *string));
static void RelinkItems _ANSI_ARGS_((TkCanvas *canvasPtr,
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char *tag, Tk_Item *prevPtr));
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static Tk_Item * StartTagSearch _ANSI_ARGS_((TkCanvas *canvasPtr,
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char *tag, TagSearch *searchPtr));
/*
*--------------------------------------------------------------
*
* Tk_CanvasCmd --
*
* This procedure is invoked to process the "canvas" Tcl
* command. See the user documentation for details on what
* it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
Tk_CanvasCmd(clientData, interp, argc, argv)
ClientData clientData; /* Main window associated with
* interpreter. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
Tk_Window tkwin = (Tk_Window) clientData;
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TkCanvas *canvasPtr;
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Tk_Window new;
if (typeList == NULL) {
InitCanvas();
}
if (argc < 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " pathName ?options?\"", (char *) NULL);
return TCL_ERROR;
}
new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
if (new == NULL) {
return TCL_ERROR;
}
/*
* Initialize fields that won't be initialized by ConfigureCanvas,
* or which ConfigureCanvas expects to have reasonable values
* (e.g. resource pointers).
*/
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canvasPtr = (TkCanvas *) ckalloc(sizeof(TkCanvas));
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canvasPtr->tkwin = new;
canvasPtr->display = Tk_Display(new);
canvasPtr->interp = interp;
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canvasPtr->widgetCmd = Tcl_CreateCommand(interp,
Tk_PathName(canvasPtr->tkwin), CanvasWidgetCmd,
(ClientData) canvasPtr, CanvasCmdDeletedProc);
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canvasPtr->firstItemPtr = NULL;
canvasPtr->lastItemPtr = NULL;
canvasPtr->borderWidth = 0;
canvasPtr->bgBorder = NULL;
canvasPtr->relief = TK_RELIEF_FLAT;
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canvasPtr->highlightWidth = 0;
canvasPtr->highlightBgColorPtr = NULL;
canvasPtr->highlightColorPtr = NULL;
canvasPtr->inset = 0;
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canvasPtr->pixmapGC = None;
canvasPtr->width = None;
canvasPtr->height = None;
canvasPtr->confine = 0;
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canvasPtr->textInfo.selBorder = NULL;
canvasPtr->textInfo.selBorderWidth = 0;
canvasPtr->textInfo.selFgColorPtr = NULL;
canvasPtr->textInfo.selItemPtr = NULL;
canvasPtr->textInfo.selectFirst = -1;
canvasPtr->textInfo.selectLast = -1;
canvasPtr->textInfo.anchorItemPtr = NULL;
canvasPtr->textInfo.selectAnchor = 0;
canvasPtr->textInfo.insertBorder = NULL;
canvasPtr->textInfo.insertWidth = 0;
canvasPtr->textInfo.insertBorderWidth = 0;
canvasPtr->textInfo.focusItemPtr = NULL;
canvasPtr->textInfo.gotFocus = 0;
canvasPtr->textInfo.cursorOn = 0;
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canvasPtr->insertOnTime = 0;
canvasPtr->insertOffTime = 0;
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canvasPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
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canvasPtr->xOrigin = canvasPtr->yOrigin = 0;
canvasPtr->drawableXOrigin = canvasPtr->drawableYOrigin = 0;
canvasPtr->bindingTable = NULL;
canvasPtr->currentItemPtr = NULL;
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canvasPtr->newCurrentPtr = NULL;
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canvasPtr->closeEnough = 0.0;
canvasPtr->pickEvent.type = LeaveNotify;
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canvasPtr->pickEvent.xcrossing.x = 0;
canvasPtr->pickEvent.xcrossing.y = 0;
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canvasPtr->state = 0;
canvasPtr->xScrollCmd = NULL;
canvasPtr->yScrollCmd = NULL;
canvasPtr->scrollX1 = 0;
canvasPtr->scrollY1 = 0;
canvasPtr->scrollX2 = 0;
canvasPtr->scrollY2 = 0;
canvasPtr->regionString = NULL;
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canvasPtr->xScrollIncrement = 0;
canvasPtr->yScrollIncrement = 0;
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canvasPtr->scanX = 0;
canvasPtr->scanXOrigin = 0;
canvasPtr->scanY = 0;
canvasPtr->scanYOrigin = 0;
canvasPtr->hotPtr = NULL;
canvasPtr->hotPrevPtr = NULL;
canvasPtr->cursor = None;
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canvasPtr->takeFocus = NULL;
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canvasPtr->pixelsPerMM = WidthOfScreen(Tk_Screen(new));
canvasPtr->pixelsPerMM /= WidthMMOfScreen(Tk_Screen(new));
canvasPtr->flags = 0;
canvasPtr->nextId = 1;
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canvasPtr->psInfoPtr = NULL;
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Tk_SetClass(canvasPtr->tkwin, "Canvas");
Tk_CreateEventHandler(canvasPtr->tkwin,
ExposureMask|StructureNotifyMask|FocusChangeMask,
CanvasEventProc, (ClientData) canvasPtr);
Tk_CreateEventHandler(canvasPtr->tkwin, KeyPressMask|KeyReleaseMask
|ButtonPressMask|ButtonReleaseMask|EnterWindowMask
|LeaveWindowMask|PointerMotionMask, CanvasBindProc,
(ClientData) canvasPtr);
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Tk_CreateSelHandler(canvasPtr->tkwin, XA_PRIMARY, XA_STRING,
CanvasFetchSelection, (ClientData) canvasPtr, XA_STRING);
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if (ConfigureCanvas(interp, canvasPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
interp->result = Tk_PathName(canvasPtr->tkwin);
return TCL_OK;
error:
Tk_DestroyWindow(canvasPtr->tkwin);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* CanvasWidgetCmd --
*
* This procedure is invoked to process the Tcl command
* that corresponds to a widget managed by this module.
* See the user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
static int
CanvasWidgetCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about canvas
* widget. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
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TkCanvas *canvasPtr = (TkCanvas *) clientData;
size_t length;
int c, result;
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Tk_Item *itemPtr = NULL; /* Initialization needed only to
* prevent compiler warning. */
TagSearch search;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " option ?arg arg ...?\"", (char *) NULL);
return TCL_ERROR;
}
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Tcl_Preserve((ClientData) canvasPtr);
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result = TCL_OK;
c = argv[1][0];
length = strlen(argv[1]);
if ((c == 'a') && (strncmp(argv[1], "addtag", length) == 0)) {
if (argc < 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " addtags tag searchCommand ?arg arg ...?\"",
(char *) NULL);
goto error;
}
result = FindItems(interp, canvasPtr, argc-3, argv+3, argv[2], argv[0],
" addtag tag");
} else if ((c == 'b') && (strncmp(argv[1], "bbox", length) == 0)
&& (length >= 2)) {
int i, gotAny;
int x1 = 0, y1 = 0, x2 = 0, y2 = 0; /* Initializations needed
* only to prevent compiler
* warnings. */
if (argc < 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " bbox tagOrId ?tagOrId ...?\"",
(char *) NULL);
goto error;
}
gotAny = 0;
for (i = 2; i < argc; i++) {
for (itemPtr = StartTagSearch(canvasPtr, argv[i], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
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if ((itemPtr->x1 >= itemPtr->x2)
|| (itemPtr->y1 >= itemPtr->y2)) {
continue;
}
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if (!gotAny) {
x1 = itemPtr->x1;
y1 = itemPtr->y1;
x2 = itemPtr->x2;
y2 = itemPtr->y2;
gotAny = 1;
} else {
if (itemPtr->x1 < x1) {
x1 = itemPtr->x1;
}
if (itemPtr->y1 < y1) {
y1 = itemPtr->y1;
}
if (itemPtr->x2 > x2) {
x2 = itemPtr->x2;
}
if (itemPtr->y2 > y2) {
y2 = itemPtr->y2;
}
}
}
}
if (gotAny) {
sprintf(interp->result, "%d %d %d %d", x1, y1, x2, y2);
}
} else if ((c == 'b') && (strncmp(argv[1], "bind", length) == 0)
&& (length >= 2)) {
ClientData object;
if ((argc < 3) || (argc > 5)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " bind tagOrId ?sequence? ?command?\"",
(char *) NULL);
goto error;
}
/*
* Figure out what object to use for the binding (individual
* item vs. tag).
*/
object = 0;
if (isdigit(UCHAR(argv[2][0]))) {
int id;
char *end;
id = strtoul(argv[2], &end, 0);
if (*end != 0) {
goto bindByTag;
}
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if (itemPtr->id == id) {
object = (ClientData) itemPtr;
break;
}
}
if (object == 0) {
Tcl_AppendResult(interp, "item \"", argv[2],
"\" doesn't exist", (char *) NULL);
goto error;
}
} else {
bindByTag:
object = (ClientData) Tk_GetUid(argv[2]);
}
/*
* Make a binding table if the canvas doesn't already have
* one.
*/
if (canvasPtr->bindingTable == NULL) {
canvasPtr->bindingTable = Tk_CreateBindingTable(interp);
}
if (argc == 5) {
int append = 0;
unsigned long mask;
if (argv[4][0] == 0) {
result = Tk_DeleteBinding(interp, canvasPtr->bindingTable,
object, argv[3]);
goto done;
}
if (argv[4][0] == '+') {
argv[4]++;
append = 1;
}
mask = Tk_CreateBinding(interp, canvasPtr->bindingTable,
object, argv[3], argv[4], append);
if (mask == 0) {
goto error;
}
2024-05-27 16:40:40 +02:00
if (mask & (unsigned) ~(ButtonMotionMask|Button1MotionMask
|Button2MotionMask|Button3MotionMask|Button4MotionMask
|Button5MotionMask|ButtonPressMask|ButtonReleaseMask
|EnterWindowMask|LeaveWindowMask|KeyPressMask
|KeyReleaseMask|PointerMotionMask)) {
2024-05-27 16:13:40 +02:00
Tk_DeleteBinding(interp, canvasPtr->bindingTable,
object, argv[3]);
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "requested illegal events; ",
"only key, button, motion, and enter/leave ",
"events may be used", (char *) NULL);
goto error;
}
} else if (argc == 4) {
char *command;
command = Tk_GetBinding(interp, canvasPtr->bindingTable,
object, argv[3]);
if (command == NULL) {
goto error;
}
interp->result = command;
} else {
Tk_GetAllBindings(interp, canvasPtr->bindingTable, object);
}
} else if ((c == 'c') && (strcmp(argv[1], "canvasx") == 0)) {
int x;
double grid;
if ((argc < 3) || (argc > 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " canvasx screenx ?gridspacing?\"",
(char *) NULL);
goto error;
}
if (Tk_GetPixels(interp, canvasPtr->tkwin, argv[2], &x) != TCL_OK) {
goto error;
}
if (argc == 4) {
2024-05-27 16:40:40 +02:00
if (Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr, argv[3],
&grid) != TCL_OK) {
2024-05-27 16:13:40 +02:00
goto error;
}
} else {
grid = 0.0;
}
x += canvasPtr->xOrigin;
Tcl_PrintDouble(interp, GridAlign((double) x, grid), interp->result);
} else if ((c == 'c') && (strcmp(argv[1], "canvasy") == 0)) {
int y;
double grid;
if ((argc < 3) || (argc > 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " canvasy screeny ?gridspacing?\"",
(char *) NULL);
goto error;
}
if (Tk_GetPixels(interp, canvasPtr->tkwin, argv[2], &y) != TCL_OK) {
goto error;
}
if (argc == 4) {
2024-05-27 16:40:40 +02:00
if (Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr,
argv[3], &grid) != TCL_OK) {
2024-05-27 16:13:40 +02:00
goto error;
}
} else {
grid = 0.0;
}
y += canvasPtr->yOrigin;
Tcl_PrintDouble(interp, GridAlign((double) y, grid), interp->result);
2024-05-27 16:40:40 +02:00
} else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
&& (length >= 2)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " cget option\"",
(char *) NULL);
goto error;
}
result = Tk_ConfigureValue(interp, canvasPtr->tkwin, configSpecs,
(char *) canvasPtr, argv[2], 0);
2024-05-27 16:13:40 +02:00
} else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
&& (length >= 3)) {
if (argc == 2) {
result = Tk_ConfigureInfo(interp, canvasPtr->tkwin, configSpecs,
(char *) canvasPtr, (char *) NULL, 0);
} else if (argc == 3) {
result = Tk_ConfigureInfo(interp, canvasPtr->tkwin, configSpecs,
(char *) canvasPtr, argv[2], 0);
} else {
result = ConfigureCanvas(interp, canvasPtr, argc-2, argv+2,
TK_CONFIG_ARGV_ONLY);
}
} else if ((c == 'c') && (strncmp(argv[1], "coords", length) == 0)
&& (length >= 3)) {
if (argc < 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " coords tagOrId ?x y x y ...?\"",
(char *) NULL);
goto error;
}
itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
if (itemPtr != NULL) {
if (argc != 3) {
2024-05-27 16:40:40 +02:00
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
}
if (itemPtr->typePtr->coordProc != NULL) {
2024-05-27 16:40:40 +02:00
result = (*itemPtr->typePtr->coordProc)(interp,
(Tk_Canvas) canvasPtr, itemPtr, argc-3, argv+3);
2024-05-27 16:13:40 +02:00
}
if (argc != 3) {
2024-05-27 16:40:40 +02:00
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
}
}
} else if ((c == 'c') && (strncmp(argv[1], "create", length) == 0)
&& (length >= 2)) {
2024-05-27 16:40:40 +02:00
Tk_ItemType *typePtr;
2024-05-27 16:13:40 +02:00
Tk_ItemType *matchPtr = NULL;
2024-05-27 16:40:40 +02:00
Tk_Item *itemPtr;
2024-05-27 16:13:40 +02:00
if (argc < 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " create type ?arg arg ...?\"", (char *) NULL);
goto error;
}
c = argv[2][0];
length = strlen(argv[2]);
for (typePtr = typeList; typePtr != NULL; typePtr = typePtr->nextPtr) {
if ((c == typePtr->name[0])
&& (strncmp(argv[2], typePtr->name, length) == 0)) {
if (matchPtr != NULL) {
badType:
Tcl_AppendResult(interp,
"unknown or ambiguous item type \"",
argv[2], "\"", (char *) NULL);
goto error;
}
matchPtr = typePtr;
}
}
if (matchPtr == NULL) {
goto badType;
}
typePtr = matchPtr;
itemPtr = (Tk_Item *) ckalloc((unsigned) typePtr->itemSize);
itemPtr->id = canvasPtr->nextId;
canvasPtr->nextId++;
itemPtr->tagPtr = itemPtr->staticTagSpace;
itemPtr->tagSpace = TK_TAG_SPACE;
itemPtr->numTags = 0;
itemPtr->typePtr = typePtr;
2024-05-27 16:40:40 +02:00
if ((*typePtr->createProc)(interp, (Tk_Canvas) canvasPtr,
itemPtr, argc-3, argv+3) != TCL_OK) {
2024-05-27 16:13:40 +02:00
ckfree((char *) itemPtr);
goto error;
}
itemPtr->nextPtr = NULL;
canvasPtr->hotPtr = itemPtr;
canvasPtr->hotPrevPtr = canvasPtr->lastItemPtr;
if (canvasPtr->lastItemPtr == NULL) {
canvasPtr->firstItemPtr = itemPtr;
} else {
canvasPtr->lastItemPtr->nextPtr = itemPtr;
}
canvasPtr->lastItemPtr = itemPtr;
2024-05-27 16:40:40 +02:00
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
canvasPtr->flags |= REPICK_NEEDED;
sprintf(interp->result, "%d", itemPtr->id);
} else if ((c == 'd') && (strncmp(argv[1], "dchars", length) == 0)
&& (length >= 2)) {
int first, last;
if ((argc != 4) && (argc != 5)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " dchars tagOrId first ?last?\"",
(char *) NULL);
goto error;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
if ((itemPtr->typePtr->indexProc == NULL)
|| (itemPtr->typePtr->dCharsProc == NULL)) {
continue;
}
2024-05-27 16:40:40 +02:00
if ((*itemPtr->typePtr->indexProc)(interp, (Tk_Canvas) canvasPtr,
itemPtr, argv[3], &first) != TCL_OK) {
2024-05-27 16:13:40 +02:00
goto error;
}
if (argc == 5) {
2024-05-27 16:40:40 +02:00
if ((*itemPtr->typePtr->indexProc)(interp,
(Tk_Canvas) canvasPtr, itemPtr, argv[4], &last)
!= TCL_OK) {
2024-05-27 16:13:40 +02:00
goto error;
}
} else {
last = first;
}
/*
* Redraw both item's old and new areas: it's possible
* that a delete could result in a new area larger than
* the old area.
*/
2024-05-27 16:40:40 +02:00
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
(*itemPtr->typePtr->dCharsProc)((Tk_Canvas) canvasPtr,
itemPtr, first, last);
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
}
} else if ((c == 'd') && (strncmp(argv[1], "delete", length) == 0)
&& (length >= 2)) {
int i;
for (i = 2; i < argc; i++) {
for (itemPtr = StartTagSearch(canvasPtr, argv[i], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
2024-05-27 16:40:40 +02:00
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
if (canvasPtr->bindingTable != NULL) {
Tk_DeleteAllBindings(canvasPtr->bindingTable,
(ClientData) itemPtr);
}
2024-05-27 16:40:40 +02:00
(*itemPtr->typePtr->deleteProc)((Tk_Canvas) canvasPtr, itemPtr,
canvasPtr->display);
2024-05-27 16:13:40 +02:00
if (itemPtr->tagPtr != itemPtr->staticTagSpace) {
ckfree((char *) itemPtr->tagPtr);
}
if (search.prevPtr == NULL) {
canvasPtr->firstItemPtr = itemPtr->nextPtr;
if (canvasPtr->firstItemPtr == NULL) {
canvasPtr->lastItemPtr = NULL;
}
} else {
search.prevPtr->nextPtr = itemPtr->nextPtr;
}
if (canvasPtr->lastItemPtr == itemPtr) {
canvasPtr->lastItemPtr = search.prevPtr;
}
ckfree((char *) itemPtr);
if (itemPtr == canvasPtr->currentItemPtr) {
canvasPtr->currentItemPtr = NULL;
canvasPtr->flags |= REPICK_NEEDED;
}
2024-05-27 16:40:40 +02:00
if (itemPtr == canvasPtr->newCurrentPtr) {
canvasPtr->newCurrentPtr = NULL;
canvasPtr->flags |= REPICK_NEEDED;
}
if (itemPtr == canvasPtr->textInfo.focusItemPtr) {
canvasPtr->textInfo.focusItemPtr = NULL;
2024-05-27 16:13:40 +02:00
}
2024-05-27 16:40:40 +02:00
if (itemPtr == canvasPtr->textInfo.selItemPtr) {
canvasPtr->textInfo.selItemPtr = NULL;
2024-05-27 16:13:40 +02:00
}
if ((itemPtr == canvasPtr->hotPtr)
2024-05-27 16:40:40 +02:00
|| (itemPtr == canvasPtr->hotPrevPtr)) {
2024-05-27 16:13:40 +02:00
canvasPtr->hotPtr = NULL;
}
}
}
} else if ((c == 'd') && (strncmp(argv[1], "dtag", length) == 0)
&& (length >= 2)) {
Tk_Uid tag;
int i;
if ((argc != 3) && (argc != 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " dtag tagOrId ?tagToDelete?\"",
(char *) NULL);
goto error;
}
if (argc == 4) {
tag = Tk_GetUid(argv[3]);
} else {
tag = Tk_GetUid(argv[2]);
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
for (i = itemPtr->numTags-1; i >= 0; i--) {
if (itemPtr->tagPtr[i] == tag) {
itemPtr->tagPtr[i] = itemPtr->tagPtr[itemPtr->numTags-1];
itemPtr->numTags--;
}
}
}
} else if ((c == 'f') && (strncmp(argv[1], "find", length) == 0)
&& (length >= 2)) {
if (argc < 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " find searchCommand ?arg arg ...?\"",
(char *) NULL);
goto error;
}
result = FindItems(interp, canvasPtr, argc-2, argv+2, (char *) NULL,
argv[0]," find");
} else if ((c == 'f') && (strncmp(argv[1], "focus", length) == 0)
&& (length >= 2)) {
if (argc > 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " focus ?tagOrId?\"",
(char *) NULL);
goto error;
}
2024-05-27 16:40:40 +02:00
itemPtr = canvasPtr->textInfo.focusItemPtr;
2024-05-27 16:13:40 +02:00
if (argc == 2) {
if (itemPtr != NULL) {
sprintf(interp->result, "%d", itemPtr->id);
}
goto done;
}
2024-05-27 16:40:40 +02:00
if ((itemPtr != NULL) && (canvasPtr->textInfo.gotFocus)) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
}
if (argv[2][0] == 0) {
2024-05-27 16:40:40 +02:00
canvasPtr->textInfo.focusItemPtr = NULL;
2024-05-27 16:13:40 +02:00
goto done;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
if (itemPtr->typePtr->icursorProc != NULL) {
break;
}
}
if (itemPtr == NULL) {
goto done;
}
2024-05-27 16:40:40 +02:00
canvasPtr->textInfo.focusItemPtr = itemPtr;
if (canvasPtr->textInfo.gotFocus) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
}
} else if ((c == 'g') && (strncmp(argv[1], "gettags", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " gettags tagOrId\"", (char *) NULL);
goto error;
}
itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
if (itemPtr != NULL) {
int i;
for (i = 0; i < itemPtr->numTags; i++) {
Tcl_AppendElement(interp, (char *) itemPtr->tagPtr[i]);
}
}
} else if ((c == 'i') && (strncmp(argv[1], "icursor", length) == 0)
&& (length >= 2)) {
int index;
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " icursor tagOrId index\"",
(char *) NULL);
goto error;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
if ((itemPtr->typePtr->indexProc == NULL)
|| (itemPtr->typePtr->icursorProc == NULL)) {
goto done;
}
2024-05-27 16:40:40 +02:00
if ((*itemPtr->typePtr->indexProc)(interp, (Tk_Canvas) canvasPtr,
itemPtr, argv[3], &index) != TCL_OK) {
2024-05-27 16:13:40 +02:00
goto error;
}
2024-05-27 16:40:40 +02:00
(*itemPtr->typePtr->icursorProc)((Tk_Canvas) canvasPtr, itemPtr,
index);
if ((itemPtr == canvasPtr->textInfo.focusItemPtr)
&& (canvasPtr->textInfo.cursorOn)) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
}
}
} else if ((c == 'i') && (strncmp(argv[1], "index", length) == 0)
&& (length >= 3)) {
int index;
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " index tagOrId string\"",
(char *) NULL);
goto error;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
if (itemPtr->typePtr->indexProc != NULL) {
break;
}
}
if (itemPtr == NULL) {
Tcl_AppendResult(interp, "can't find an indexable item \"",
argv[2], "\"", (char *) NULL);
goto error;
}
2024-05-27 16:40:40 +02:00
if ((*itemPtr->typePtr->indexProc)(interp, (Tk_Canvas) canvasPtr,
itemPtr, argv[3], &index) != TCL_OK) {
2024-05-27 16:13:40 +02:00
goto error;
}
sprintf(interp->result, "%d", index);
} else if ((c == 'i') && (strncmp(argv[1], "insert", length) == 0)
&& (length >= 3)) {
int beforeThis;
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " insert tagOrId beforeThis string\"",
(char *) NULL);
goto error;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
if ((itemPtr->typePtr->indexProc == NULL)
|| (itemPtr->typePtr->insertProc == NULL)) {
continue;
}
2024-05-27 16:40:40 +02:00
if ((*itemPtr->typePtr->indexProc)(interp, (Tk_Canvas) canvasPtr,
itemPtr, argv[3], &beforeThis) != TCL_OK) {
2024-05-27 16:13:40 +02:00
goto error;
}
/*
* Redraw both item's old and new areas: it's possible
* that an insertion could result in a new area either
* larger or smaller than the old area.
*/
2024-05-27 16:40:40 +02:00
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
(*itemPtr->typePtr->insertProc)((Tk_Canvas) canvasPtr,
itemPtr, beforeThis, argv[4]);
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr, itemPtr->x1,
itemPtr->y1, itemPtr->x2, itemPtr->y2);
}
} else if ((c == 'i') && (strncmp(argv[1], "itemcget", length) == 0)
&& (length >= 6)) {
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " itemcget tagOrId option\"",
(char *) NULL);
return TCL_ERROR;
}
itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
if (itemPtr != NULL) {
result = Tk_ConfigureValue(canvasPtr->interp, canvasPtr->tkwin,
itemPtr->typePtr->configSpecs, (char *) itemPtr,
argv[3], 0);
2024-05-27 16:13:40 +02:00
}
} else if ((c == 'i') && (strncmp(argv[1], "itemconfigure", length) == 0)
2024-05-27 16:40:40 +02:00
&& (length >= 6)) {
2024-05-27 16:13:40 +02:00
if (argc < 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " itemconfigure tagOrId ?option value ...?\"",
(char *) NULL);
goto error;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
if (argc == 3) {
result = Tk_ConfigureInfo(canvasPtr->interp, canvasPtr->tkwin,
itemPtr->typePtr->configSpecs, (char *) itemPtr,
(char *) NULL, 0);
} else if (argc == 4) {
result = Tk_ConfigureInfo(canvasPtr->interp, canvasPtr->tkwin,
itemPtr->typePtr->configSpecs, (char *) itemPtr,
argv[3], 0);
} else {
2024-05-27 16:40:40 +02:00
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
result = (*itemPtr->typePtr->configProc)(interp,
(Tk_Canvas) canvasPtr, itemPtr, argc-3, argv+3,
TK_CONFIG_ARGV_ONLY);
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
canvasPtr->flags |= REPICK_NEEDED;
}
if ((result != TCL_OK) || (argc < 5)) {
break;
}
}
} else if ((c == 'l') && (strncmp(argv[1], "lower", length) == 0)) {
Tk_Item *prevPtr;
if ((argc != 3) && (argc != 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " lower tagOrId ?belowThis?\"",
(char *) NULL);
goto error;
}
/*
* First find the item just after which we'll insert the
* named items.
*/
if (argc == 3) {
prevPtr = NULL;
} else {
prevPtr = StartTagSearch(canvasPtr, argv[3], &search);
if (prevPtr != NULL) {
prevPtr = search.prevPtr;
} else {
Tcl_AppendResult(interp, "tag \"", argv[3],
"\" doesn't match any items", (char *) NULL);
goto error;
}
}
RelinkItems(canvasPtr, argv[2], prevPtr);
} else if ((c == 'm') && (strncmp(argv[1], "move", length) == 0)) {
double xAmount, yAmount;
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " move tagOrId xAmount yAmount\"",
(char *) NULL);
goto error;
}
2024-05-27 16:40:40 +02:00
if ((Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr, argv[3],
&xAmount) != TCL_OK) || (Tk_CanvasGetCoord(interp,
(Tk_Canvas) canvasPtr, argv[4], &yAmount) != TCL_OK)) {
2024-05-27 16:13:40 +02:00
goto error;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
2024-05-27 16:40:40 +02:00
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
(void) (*itemPtr->typePtr->translateProc)((Tk_Canvas) canvasPtr,
itemPtr, xAmount, yAmount);
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
canvasPtr->flags |= REPICK_NEEDED;
}
} else if ((c == 'p') && (strncmp(argv[1], "postscript", length) == 0)) {
result = TkCanvPostscriptCmd(canvasPtr, interp, argc, argv);
} else if ((c == 'r') && (strncmp(argv[1], "raise", length) == 0)) {
Tk_Item *prevPtr;
if ((argc != 3) && (argc != 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " raise tagOrId ?aboveThis?\"",
(char *) NULL);
goto error;
}
/*
* First find the item just after which we'll insert the
* named items.
*/
if (argc == 3) {
prevPtr = canvasPtr->lastItemPtr;
} else {
prevPtr = NULL;
for (itemPtr = StartTagSearch(canvasPtr, argv[3], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
prevPtr = itemPtr;
}
if (prevPtr == NULL) {
Tcl_AppendResult(interp, "tagOrId \"", argv[3],
"\" doesn't match any items", (char *) NULL);
goto error;
}
}
RelinkItems(canvasPtr, argv[2], prevPtr);
} else if ((c == 's') && (strncmp(argv[1], "scale", length) == 0)
&& (length >= 3)) {
double xOrigin, yOrigin, xScale, yScale;
if (argc != 7) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " scale tagOrId xOrigin yOrigin xScale yScale\"",
(char *) NULL);
goto error;
}
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if ((Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr,
argv[3], &xOrigin) != TCL_OK)
|| (Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr,
argv[4], &yOrigin) != TCL_OK)
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|| (Tcl_GetDouble(interp, argv[5], &xScale) != TCL_OK)
|| (Tcl_GetDouble(interp, argv[6], &yScale) != TCL_OK)) {
goto error;
}
if ((xScale == 0.0) || (yScale == 0.0)) {
interp->result = "scale factor cannot be zero";
goto error;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
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Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
(void) (*itemPtr->typePtr->scaleProc)((Tk_Canvas) canvasPtr,
itemPtr, xOrigin, yOrigin, xScale, yScale);
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
2024-05-27 16:13:40 +02:00
canvasPtr->flags |= REPICK_NEEDED;
}
} else if ((c == 's') && (strncmp(argv[1], "scan", length) == 0)
&& (length >= 3)) {
int x, y;
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " scan mark|dragto x y\"", (char *) NULL);
goto error;
}
if ((Tcl_GetInt(interp, argv[3], &x) != TCL_OK)
|| (Tcl_GetInt(interp, argv[4], &y) != TCL_OK)){
goto error;
}
if ((argv[2][0] == 'm')
&& (strncmp(argv[2], "mark", strlen(argv[2])) == 0)) {
canvasPtr->scanX = x;
canvasPtr->scanXOrigin = canvasPtr->xOrigin;
canvasPtr->scanY = y;
canvasPtr->scanYOrigin = canvasPtr->yOrigin;
} else if ((argv[2][0] == 'd')
&& (strncmp(argv[2], "dragto", strlen(argv[2])) == 0)) {
int newXOrigin, newYOrigin, tmp;
/*
* Compute a new view origin for the canvas, amplifying the
2024-05-27 16:40:40 +02:00
* mouse motion.
2024-05-27 16:13:40 +02:00
*/
tmp = canvasPtr->scanXOrigin - 10*(x - canvasPtr->scanX)
- canvasPtr->scrollX1;
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newXOrigin = canvasPtr->scrollX1 + tmp;
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tmp = canvasPtr->scanYOrigin - 10*(y - canvasPtr->scanY)
- canvasPtr->scrollY1;
2024-05-27 16:40:40 +02:00
newYOrigin = canvasPtr->scrollY1 + tmp;
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CanvasSetOrigin(canvasPtr, newXOrigin, newYOrigin);
} else {
Tcl_AppendResult(interp, "bad scan option \"", argv[2],
2024-05-27 16:40:40 +02:00
"\": must be mark or dragto", (char *) NULL);
2024-05-27 16:13:40 +02:00
goto error;
}
} else if ((c == 's') && (strncmp(argv[1], "select", length) == 0)
&& (length >= 2)) {
int index;
if (argc < 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " select option ?tagOrId? ?arg?\"", (char *) NULL);
goto error;
}
if (argc >= 4) {
for (itemPtr = StartTagSearch(canvasPtr, argv[3], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
if ((itemPtr->typePtr->indexProc != NULL)
&& (itemPtr->typePtr->selectionProc != NULL)){
break;
}
}
if (itemPtr == NULL) {
Tcl_AppendResult(interp,
"can't find an indexable and selectable item \"",
argv[3], "\"", (char *) NULL);
goto error;
}
}
if (argc == 5) {
2024-05-27 16:40:40 +02:00
if ((*itemPtr->typePtr->indexProc)(interp, (Tk_Canvas) canvasPtr,
itemPtr, argv[4], &index) != TCL_OK) {
2024-05-27 16:13:40 +02:00
goto error;
}
}
length = strlen(argv[2]);
c = argv[2][0];
if ((c == 'a') && (strncmp(argv[2], "adjust", length) == 0)) {
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " select adjust tagOrId index\"",
(char *) NULL);
goto error;
}
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if (canvasPtr->textInfo.selItemPtr == itemPtr) {
if (index < (canvasPtr->textInfo.selectFirst
+ canvasPtr->textInfo.selectLast)/2) {
canvasPtr->textInfo.selectAnchor =
canvasPtr->textInfo.selectLast + 1;
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} else {
2024-05-27 16:40:40 +02:00
canvasPtr->textInfo.selectAnchor =
canvasPtr->textInfo.selectFirst;
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}
}
CanvasSelectTo(canvasPtr, itemPtr, index);
} else if ((c == 'c') && (argv[2] != NULL)
&& (strncmp(argv[2], "clear", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " select clear\"", (char *) NULL);
goto error;
}
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if (canvasPtr->textInfo.selItemPtr != NULL) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->textInfo.selItemPtr->x1,
canvasPtr->textInfo.selItemPtr->y1,
canvasPtr->textInfo.selItemPtr->x2,
canvasPtr->textInfo.selItemPtr->y2);
canvasPtr->textInfo.selItemPtr = NULL;
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}
goto done;
} else if ((c == 'f') && (strncmp(argv[2], "from", length) == 0)) {
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " select from tagOrId index\"",
(char *) NULL);
goto error;
}
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canvasPtr->textInfo.anchorItemPtr = itemPtr;
canvasPtr->textInfo.selectAnchor = index;
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} else if ((c == 'i') && (strncmp(argv[2], "item", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " select item\"", (char *) NULL);
goto error;
}
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if (canvasPtr->textInfo.selItemPtr != NULL) {
sprintf(interp->result, "%d",
canvasPtr->textInfo.selItemPtr->id);
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}
} else if ((c == 't') && (strncmp(argv[2], "to", length) == 0)) {
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " select to tagOrId index\"",
(char *) NULL);
goto error;
}
CanvasSelectTo(canvasPtr, itemPtr, index);
} else {
Tcl_AppendResult(interp, "bad select option \"", argv[2],
"\": must be adjust, clear, from, item, or to",
(char *) NULL);
goto error;
}
} else if ((c == 't') && (strncmp(argv[1], "type", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " type tag\"", (char *) NULL);
goto error;
}
itemPtr = StartTagSearch(canvasPtr, argv[2], &search);
if (itemPtr != NULL) {
interp->result = itemPtr->typePtr->name;
}
} else if ((c == 'x') && (strncmp(argv[1], "xview", length) == 0)) {
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int count, type;
int newX = 0; /* Initialization needed only to prevent
* gcc warnings. */
double fraction;
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if (argc == 2) {
PrintScrollFractions(canvasPtr->xOrigin + canvasPtr->inset,
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin)
- canvasPtr->inset, canvasPtr->scrollX1,
canvasPtr->scrollX2, interp->result);
} else {
type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
switch (type) {
case TK_SCROLL_ERROR:
goto error;
case TK_SCROLL_MOVETO:
newX = canvasPtr->scrollX1 - canvasPtr->inset
+ (int) (fraction * (canvasPtr->scrollX2
- canvasPtr->scrollX1) + 0.5);
break;
case TK_SCROLL_PAGES:
newX = canvasPtr->xOrigin + count * .9
* (Tk_Width(canvasPtr->tkwin) - 2*canvasPtr->inset);
break;
case TK_SCROLL_UNITS:
if (canvasPtr->xScrollIncrement > 0) {
newX = canvasPtr->xOrigin
+ count*canvasPtr->xScrollIncrement;
} else {
newX = canvasPtr->xOrigin + count * .1
* (Tk_Width(canvasPtr->tkwin)
- 2*canvasPtr->inset);
}
break;
}
CanvasSetOrigin(canvasPtr, newX, canvasPtr->yOrigin);
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}
} else if ((c == 'y') && (strncmp(argv[1], "yview", length) == 0)) {
2024-05-27 16:40:40 +02:00
int count, type;
int newY = 0; /* Initialization needed only to prevent
* gcc warnings. */
double fraction;
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2024-05-27 16:40:40 +02:00
if (argc == 2) {
PrintScrollFractions(canvasPtr->yOrigin + canvasPtr->inset,
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin)
- canvasPtr->inset, canvasPtr->scrollY1,
canvasPtr->scrollY2, interp->result);
} else {
type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
switch (type) {
case TK_SCROLL_ERROR:
goto error;
case TK_SCROLL_MOVETO:
newY = canvasPtr->scrollY1 - canvasPtr->inset
+ (int) (fraction*(canvasPtr->scrollY2
- canvasPtr->scrollY1) + 0.5);
break;
case TK_SCROLL_PAGES:
newY = canvasPtr->yOrigin + count * .9
* (Tk_Height(canvasPtr->tkwin)
- 2*canvasPtr->inset);
break;
case TK_SCROLL_UNITS:
if (canvasPtr->yScrollIncrement > 0) {
newY = canvasPtr->yOrigin
+ count*canvasPtr->yScrollIncrement;
} else {
newY = canvasPtr->yOrigin + count * .1
* (Tk_Height(canvasPtr->tkwin)
- 2*canvasPtr->inset);
}
break;
}
CanvasSetOrigin(canvasPtr, canvasPtr->xOrigin, newY);
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}
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
2024-05-27 16:40:40 +02:00
"\": must be addtag, bbox, bind, ",
"canvasx, canvasy, cget, configure, coords, create, ",
2024-05-27 16:13:40 +02:00
"dchars, delete, dtag, find, focus, ",
2024-05-27 16:40:40 +02:00
"gettags, icursor, index, insert, itemcget, itemconfigure, ",
"lower, move, postscript, raise, scale, scan, ",
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"select, type, xview, or yview",
(char *) NULL);
goto error;
}
done:
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Tcl_Release((ClientData) canvasPtr);
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return result;
error:
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Tcl_Release((ClientData) canvasPtr);
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return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DestroyCanvas --
*
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* This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
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* to clean up the internal structure of a canvas at a safe time
* (when no-one is using it anymore).
*
* Results:
* None.
*
* Side effects:
* Everything associated with the canvas is freed up.
*
*----------------------------------------------------------------------
*/
static void
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DestroyCanvas(memPtr)
char *memPtr; /* Info about canvas widget. */
2024-05-27 16:13:40 +02:00
{
2024-05-27 16:40:40 +02:00
TkCanvas *canvasPtr = (TkCanvas *) memPtr;
Tk_Item *itemPtr;
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/*
* Free up all of the items in the canvas.
*/
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = canvasPtr->firstItemPtr) {
canvasPtr->firstItemPtr = itemPtr->nextPtr;
2024-05-27 16:40:40 +02:00
(*itemPtr->typePtr->deleteProc)((Tk_Canvas) canvasPtr, itemPtr,
canvasPtr->display);
2024-05-27 16:13:40 +02:00
if (itemPtr->tagPtr != itemPtr->staticTagSpace) {
ckfree((char *) itemPtr->tagPtr);
}
ckfree((char *) itemPtr);
}
/*
* Free up all the stuff that requires special handling,
* then let Tk_FreeOptions handle all the standard option-related
* stuff.
*/
if (canvasPtr->pixmapGC != None) {
Tk_FreeGC(canvasPtr->display, canvasPtr->pixmapGC);
}
2024-05-27 16:40:40 +02:00
Tcl_DeleteTimerHandler(canvasPtr->insertBlinkHandler);
2024-05-27 16:13:40 +02:00
if (canvasPtr->bindingTable != NULL) {
Tk_DeleteBindingTable(canvasPtr->bindingTable);
}
Tk_FreeOptions(configSpecs, (char *) canvasPtr, canvasPtr->display, 0);
ckfree((char *) canvasPtr);
}
/*
*----------------------------------------------------------------------
*
* ConfigureCanvas --
*
* This procedure is called to process an argv/argc list, plus
* the Tk option database, in order to configure (or
* reconfigure) a canvas widget.
*
* Results:
* The return value is a standard Tcl result. If TCL_ERROR is
* returned, then interp->result contains an error message.
*
* Side effects:
* Configuration information, such as colors, border width,
* etc. get set for canvasPtr; old resources get freed,
* if there were any.
*
*----------------------------------------------------------------------
*/
static int
ConfigureCanvas(interp, canvasPtr, argc, argv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
2024-05-27 16:40:40 +02:00
TkCanvas *canvasPtr; /* Information about widget; may or may
2024-05-27 16:13:40 +02:00
* not already have values for some fields. */
int argc; /* Number of valid entries in argv. */
char **argv; /* Arguments. */
int flags; /* Flags to pass to Tk_ConfigureWidget. */
{
XGCValues gcValues;
GC new;
if (Tk_ConfigureWidget(interp, canvasPtr->tkwin, configSpecs,
argc, argv, (char *) canvasPtr, flags) != TCL_OK) {
return TCL_ERROR;
}
/*
* A few options need special processing, such as setting the
* background from a 3-D border and creating a GC for copying
* bits to the screen.
*/
Tk_SetBackgroundFromBorder(canvasPtr->tkwin, canvasPtr->bgBorder);
2024-05-27 16:40:40 +02:00
if (canvasPtr->highlightWidth < 0) {
canvasPtr->highlightWidth = 0;
}
canvasPtr->inset = canvasPtr->borderWidth + canvasPtr->highlightWidth;
2024-05-27 16:13:40 +02:00
gcValues.function = GXcopy;
gcValues.foreground = Tk_3DBorderColor(canvasPtr->bgBorder)->pixel;
gcValues.graphics_exposures = False;
new = Tk_GetGC(canvasPtr->tkwin,
GCFunction|GCForeground|GCGraphicsExposures, &gcValues);
if (canvasPtr->pixmapGC != None) {
Tk_FreeGC(canvasPtr->display, canvasPtr->pixmapGC);
}
canvasPtr->pixmapGC = new;
/*
* Reset the desired dimensions for the window.
*/
2024-05-27 16:40:40 +02:00
Tk_GeometryRequest(canvasPtr->tkwin, canvasPtr->width + 2*canvasPtr->inset,
canvasPtr->height + 2*canvasPtr->inset);
2024-05-27 16:13:40 +02:00
/*
* Restart the cursor timing sequence in case the on-time or off-time
* just changed.
*/
2024-05-27 16:40:40 +02:00
if (canvasPtr->textInfo.gotFocus) {
2024-05-27 16:13:40 +02:00
CanvasFocusProc(canvasPtr, 1);
}
/*
* Recompute the scroll region.
*/
canvasPtr->scrollX1 = 0;
canvasPtr->scrollY1 = 0;
canvasPtr->scrollX2 = 0;
canvasPtr->scrollY2 = 0;
if (canvasPtr->regionString != NULL) {
int argc2;
char **argv2;
if (Tcl_SplitList(canvasPtr->interp, canvasPtr->regionString,
&argc2, &argv2) != TCL_OK) {
return TCL_ERROR;
}
if (argc2 != 4) {
Tcl_AppendResult(interp, "bad scrollRegion \"",
canvasPtr->regionString, "\"", (char *) NULL);
2024-05-27 16:40:40 +02:00
badRegion:
2024-05-27 16:13:40 +02:00
ckfree(canvasPtr->regionString);
ckfree((char *) argv2);
canvasPtr->regionString = NULL;
return TCL_ERROR;
}
if ((Tk_GetPixels(canvasPtr->interp, canvasPtr->tkwin,
argv2[0], &canvasPtr->scrollX1) != TCL_OK)
|| (Tk_GetPixels(canvasPtr->interp, canvasPtr->tkwin,
argv2[1], &canvasPtr->scrollY1) != TCL_OK)
|| (Tk_GetPixels(canvasPtr->interp, canvasPtr->tkwin,
argv2[2], &canvasPtr->scrollX2) != TCL_OK)
|| (Tk_GetPixels(canvasPtr->interp, canvasPtr->tkwin,
argv2[3], &canvasPtr->scrollY2) != TCL_OK)) {
goto badRegion;
}
ckfree((char *) argv2);
}
/*
2024-05-27 16:40:40 +02:00
* Reset the canvas's origin (this is a no-op unless confine
2024-05-27 16:13:40 +02:00
* mode has just been turned on or the scroll region has changed).
*/
CanvasSetOrigin(canvasPtr, canvasPtr->xOrigin, canvasPtr->yOrigin);
2024-05-27 16:40:40 +02:00
canvasPtr->flags |= UPDATE_SCROLLBARS|REDRAW_BORDERS;
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->xOrigin, canvasPtr->yOrigin,
2024-05-27 16:13:40 +02:00
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* DisplayCanvas --
*
* This procedure redraws the contents of a canvas window.
* It is invoked as a do-when-idle handler, so it only runs
* when there's nothing else for the application to do.
*
* Results:
* None.
*
* Side effects:
* Information appears on the screen.
*
*--------------------------------------------------------------
*/
static void
DisplayCanvas(clientData)
ClientData clientData; /* Information about widget. */
{
2024-05-27 16:40:40 +02:00
TkCanvas *canvasPtr = (TkCanvas *) clientData;
Tk_Window tkwin = canvasPtr->tkwin;
Tk_Item *itemPtr;
2024-05-27 16:13:40 +02:00
Pixmap pixmap;
2024-05-27 16:40:40 +02:00
int screenX1, screenX2, screenY1, screenY2, width, height;
2024-05-27 16:13:40 +02:00
if (canvasPtr->tkwin == NULL) {
return;
}
if (!Tk_IsMapped(tkwin)) {
goto done;
}
/*
* Choose a new current item if that is needed (this could cause
* event handlers to be invoked).
*/
while (canvasPtr->flags & REPICK_NEEDED) {
2024-05-27 16:40:40 +02:00
Tcl_Preserve((ClientData) canvasPtr);
2024-05-27 16:13:40 +02:00
canvasPtr->flags &= ~REPICK_NEEDED;
PickCurrentItem(canvasPtr, &canvasPtr->pickEvent);
tkwin = canvasPtr->tkwin;
2024-05-27 16:40:40 +02:00
Tcl_Release((ClientData) canvasPtr);
2024-05-27 16:13:40 +02:00
if (tkwin == NULL) {
return;
}
}
/*
* Compute the intersection between the area that needs redrawing
* and the area that's visible on the screen.
*/
2024-05-27 16:40:40 +02:00
if ((canvasPtr->redrawX1 < canvasPtr->redrawX2)
&& (canvasPtr->redrawY1 < canvasPtr->redrawY2)) {
screenX1 = canvasPtr->xOrigin + canvasPtr->inset;
screenY1 = canvasPtr->yOrigin + canvasPtr->inset;
screenX2 = canvasPtr->xOrigin + Tk_Width(tkwin) - canvasPtr->inset;
screenY2 = canvasPtr->yOrigin + Tk_Height(tkwin) - canvasPtr->inset;
if (canvasPtr->redrawX1 > screenX1) {
screenX1 = canvasPtr->redrawX1;
}
if (canvasPtr->redrawY1 > screenY1) {
screenY1 = canvasPtr->redrawY1;
}
if (canvasPtr->redrawX2 < screenX2) {
screenX2 = canvasPtr->redrawX2;
}
if (canvasPtr->redrawY2 < screenY2) {
screenY2 = canvasPtr->redrawY2;
}
if ((screenX1 >= screenX2) || (screenY1 >= screenY2)) {
goto borders;
}
/*
* Redrawing is done in a temporary pixmap that is allocated
* here and freed at the end of the procedure. All drawing
* is done to the pixmap, and the pixmap is copied to the
* screen at the end of the procedure. The temporary pixmap
* serves two purposes:
*
* 1. It provides a smoother visual effect (no clearing and
* gradual redraw will be visible to users).
* 2. It allows us to redraw only the objects that overlap
* the redraw area. Otherwise incorrect results could
* occur from redrawing things that stick outside of
* the redraw area (we'd have to redraw everything in
* order to make the overlaps look right).
*
* Some tricky points about the pixmap:
*
* 1. We only allocate a large enough pixmap to hold the
* area that has to be redisplayed. This saves time in
* in the X server for large objects that cover much
* more than the area being redisplayed: only the area
* of the pixmap will actually have to be redrawn.
* 2. Some X servers (e.g. the one for DECstations) have troubles
* with characters that overlap an edge of the pixmap (on the
* DEC servers, as of 8/18/92, such characters are drawn one
* pixel too far to the right). To handle this problem,
* make the pixmap a bit larger than is absolutely needed
* so that for normal-sized fonts the characters that overlap
* the edge of the pixmap will be outside the area we care
* about.
*/
canvasPtr->drawableXOrigin = screenX1 - 30;
canvasPtr->drawableYOrigin = screenY1 - 30;
pixmap = Tk_GetPixmap(Tk_Display(tkwin), Tk_WindowId(tkwin),
(screenX2 + 30 - canvasPtr->drawableXOrigin),
(screenY2 + 30 - canvasPtr->drawableYOrigin),
Tk_Depth(tkwin));
/*
* Clear the area to be redrawn.
*/
width = screenX2 - screenX1;
height = screenY2 - screenY1;
XFillRectangle(Tk_Display(tkwin), pixmap, canvasPtr->pixmapGC,
screenX1 - canvasPtr->drawableXOrigin,
screenY1 - canvasPtr->drawableYOrigin, (unsigned int) width,
(unsigned int) height);
/*
* Scan through the item list, redrawing those items that need it.
* An item must be redraw if either (a) it intersects the smaller
* on-screen area or (b) it intersects the full canvas area and its
* type requests that it be redrawn always (e.g. so subwindows can
* be unmapped when they move off-screen).
*/
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if ((itemPtr->x1 >= screenX2)
|| (itemPtr->y1 >= screenY2)
|| (itemPtr->x2 < screenX1)
|| (itemPtr->y2 < screenY1)) {
if (!itemPtr->typePtr->alwaysRedraw
|| (itemPtr->x1 >= canvasPtr->redrawX2)
|| (itemPtr->y1 >= canvasPtr->redrawY2)
|| (itemPtr->x2 < canvasPtr->redrawX1)
|| (itemPtr->y2 < canvasPtr->redrawY1)) {
continue;
}
2024-05-27 16:13:40 +02:00
}
2024-05-27 16:40:40 +02:00
(*itemPtr->typePtr->displayProc)((Tk_Canvas) canvasPtr, itemPtr,
canvasPtr->display, pixmap, screenX1, screenY1, width,
height);
2024-05-27 16:13:40 +02:00
}
2024-05-27 16:40:40 +02:00
/*
* Copy from the temporary pixmap to the screen, then free up
* the temporary pixmap.
*/
XCopyArea(Tk_Display(tkwin), pixmap, Tk_WindowId(tkwin),
canvasPtr->pixmapGC,
screenX1 - canvasPtr->drawableXOrigin,
screenY1 - canvasPtr->drawableYOrigin,
(unsigned) (screenX2 - screenX1),
(unsigned) (screenY2 - screenY1),
screenX1 - canvasPtr->xOrigin, screenY1 - canvasPtr->yOrigin);
Tk_FreePixmap(Tk_Display(tkwin), pixmap);
2024-05-27 16:13:40 +02:00
}
/*
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* Draw the window borders, if needed.
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*/
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borders:
if (canvasPtr->flags & REDRAW_BORDERS) {
canvasPtr->flags &= ~REDRAW_BORDERS;
if (canvasPtr->borderWidth > 0) {
Tk_Draw3DRectangle(tkwin, Tk_WindowId(tkwin),
canvasPtr->bgBorder, canvasPtr->highlightWidth,
canvasPtr->highlightWidth,
Tk_Width(tkwin) - 2*canvasPtr->highlightWidth,
Tk_Height(tkwin) - 2*canvasPtr->highlightWidth,
canvasPtr->borderWidth, canvasPtr->relief);
}
if (canvasPtr->highlightWidth != 0) {
GC gc;
if (canvasPtr->textInfo.gotFocus) {
gc = Tk_GCForColor(canvasPtr->highlightColorPtr,
Tk_WindowId(tkwin));
} else {
gc = Tk_GCForColor(canvasPtr->highlightBgColorPtr,
Tk_WindowId(tkwin));
}
Tk_DrawFocusHighlight(tkwin, gc, canvasPtr->highlightWidth,
Tk_WindowId(tkwin));
}
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}
done:
canvasPtr->flags &= ~REDRAW_PENDING;
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canvasPtr->redrawX1 = canvasPtr->redrawX2 = 0;
canvasPtr->redrawY1 = canvasPtr->redrawY2 = 0;
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if (canvasPtr->flags & UPDATE_SCROLLBARS) {
CanvasUpdateScrollbars(canvasPtr);
}
}
/*
*--------------------------------------------------------------
*
* CanvasEventProc --
*
* This procedure is invoked by the Tk dispatcher for various
* events on canvases.
*
* Results:
* None.
*
* Side effects:
* When the window gets deleted, internal structures get
* cleaned up. When it gets exposed, it is redisplayed.
*
*--------------------------------------------------------------
*/
static void
CanvasEventProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
XEvent *eventPtr; /* Information about event. */
{
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TkCanvas *canvasPtr = (TkCanvas *) clientData;
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if (eventPtr->type == Expose) {
int x, y;
x = eventPtr->xexpose.x + canvasPtr->xOrigin;
y = eventPtr->xexpose.y + canvasPtr->yOrigin;
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Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr, x, y,
x + eventPtr->xexpose.width,
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y + eventPtr->xexpose.height);
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if ((eventPtr->xexpose.x < canvasPtr->inset)
|| (eventPtr->xexpose.y < canvasPtr->inset)
|| ((eventPtr->xexpose.x + eventPtr->xexpose.width)
> (Tk_Width(canvasPtr->tkwin) - canvasPtr->inset))
|| ((eventPtr->xexpose.y + eventPtr->xexpose.height)
> (Tk_Height(canvasPtr->tkwin) - canvasPtr->inset))) {
canvasPtr->flags |= REDRAW_BORDERS;
}
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} else if (eventPtr->type == DestroyNotify) {
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if (canvasPtr->tkwin != NULL) {
canvasPtr->tkwin = NULL;
Tcl_DeleteCommand(canvasPtr->interp,
Tcl_GetCommandName(canvasPtr->interp,
canvasPtr->widgetCmd));
}
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if (canvasPtr->flags & REDRAW_PENDING) {
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Tcl_CancelIdleCall(DisplayCanvas, (ClientData) canvasPtr);
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}
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Tcl_EventuallyFree((ClientData) canvasPtr, DestroyCanvas);
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} else if (eventPtr->type == ConfigureNotify) {
canvasPtr->flags |= UPDATE_SCROLLBARS;
/*
* The call below is needed in order to recenter the canvas if
* it's confined and its scroll region is smaller than the window.
*/
CanvasSetOrigin(canvasPtr, canvasPtr->xOrigin, canvasPtr->yOrigin);
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Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr, canvasPtr->xOrigin,
canvasPtr->yOrigin,
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
canvasPtr->flags |= REDRAW_BORDERS;
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} else if (eventPtr->type == FocusIn) {
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if (eventPtr->xfocus.detail != NotifyInferior) {
CanvasFocusProc(canvasPtr, 1);
}
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} else if (eventPtr->type == FocusOut) {
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if (eventPtr->xfocus.detail != NotifyInferior) {
CanvasFocusProc(canvasPtr, 0);
}
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} else if (eventPtr->type == UnmapNotify) {
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Tk_Item *itemPtr;
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/*
* Special hack: if the canvas is unmapped, then must notify
* all items with "alwaysRedraw" set, so that they know that
* they are no longer displayed.
*/
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if (itemPtr->typePtr->alwaysRedraw) {
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(*itemPtr->typePtr->displayProc)((Tk_Canvas) canvasPtr,
itemPtr, canvasPtr->display, None, 0, 0, 0, 0);
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}
}
}
}
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/*
*----------------------------------------------------------------------
*
* CanvasCmdDeletedProc --
*
* This procedure is invoked when a widget command is deleted. If
* the widget isn't already in the process of being destroyed,
* this command destroys it.
*
* Results:
* None.
*
* Side effects:
* The widget is destroyed.
*
*----------------------------------------------------------------------
*/
static void
CanvasCmdDeletedProc(clientData)
ClientData clientData; /* Pointer to widget record for widget. */
{
TkCanvas *canvasPtr = (TkCanvas *) clientData;
Tk_Window tkwin = canvasPtr->tkwin;
/*
* This procedure could be invoked either because the window was
* destroyed and the command was then deleted (in which case tkwin
* is NULL) or because the command was deleted, and then this procedure
* destroys the widget.
*/
if (tkwin != NULL) {
canvasPtr->tkwin = NULL;
Tk_DestroyWindow(tkwin);
}
}
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/*
*--------------------------------------------------------------
*
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* Tk_CanvasEventuallyRedraw --
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*
* Arrange for part or all of a canvas widget to redrawn at
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* some convenient time in the future.
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*
* Results:
* None.
*
* Side effects:
* The screen will eventually be refreshed.
*
*--------------------------------------------------------------
*/
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void
Tk_CanvasEventuallyRedraw(canvas, x1, y1, x2, y2)
Tk_Canvas canvas; /* Information about widget. */
int x1, y1; /* Upper left corner of area to redraw.
* Pixels on edge are redrawn. */
int x2, y2; /* Lower right corner of area to redraw.
* Pixels on edge are not redrawn. */
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{
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TkCanvas *canvasPtr = (TkCanvas *) canvas;
if ((x1 == x2) || (y1 == y2)) {
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return;
}
if (canvasPtr->flags & REDRAW_PENDING) {
if (x1 <= canvasPtr->redrawX1) {
canvasPtr->redrawX1 = x1;
}
if (y1 <= canvasPtr->redrawY1) {
canvasPtr->redrawY1 = y1;
}
if (x2 >= canvasPtr->redrawX2) {
canvasPtr->redrawX2 = x2;
}
if (y2 >= canvasPtr->redrawY2) {
canvasPtr->redrawY2 = y2;
}
} else {
canvasPtr->redrawX1 = x1;
canvasPtr->redrawY1 = y1;
canvasPtr->redrawX2 = x2;
canvasPtr->redrawY2 = y2;
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Tcl_DoWhenIdle(DisplayCanvas, (ClientData) canvasPtr);
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canvasPtr->flags |= REDRAW_PENDING;
}
}
/*
*--------------------------------------------------------------
*
* Tk_CreateItemType --
*
* This procedure may be invoked to add a new kind of canvas
* element to the core item types supported by Tk.
*
* Results:
* None.
*
* Side effects:
* From now on, the new item type will be useable in canvas
* widgets (e.g. typePtr->name can be used as the item type
* in "create" widget commands). If there was already a
* type with the same name as in typePtr, it is replaced with
* the new type.
*
*--------------------------------------------------------------
*/
void
Tk_CreateItemType(typePtr)
Tk_ItemType *typePtr; /* Information about item type;
* storage must be statically
* allocated (must live forever). */
{
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Tk_ItemType *typePtr2, *prevPtr;
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if (typeList == NULL) {
InitCanvas();
}
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/*
* If there's already an item type with the given name, remove it.
*/
for (typePtr2 = typeList, prevPtr = NULL; typePtr2 != NULL;
prevPtr = typePtr2, typePtr2 = typePtr2->nextPtr) {
if (strcmp(typePtr2->name, typePtr->name) == 0) {
if (prevPtr == NULL) {
typeList = typePtr2->nextPtr;
} else {
prevPtr->nextPtr = typePtr2->nextPtr;
}
break;
}
}
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typePtr->nextPtr = typeList;
typeList = typePtr;
}
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/*
*----------------------------------------------------------------------
*
* Tk_GetItemTypes --
*
* This procedure returns a pointer to the list of all item
* types.
*
* Results:
* The return value is a pointer to the first in the list
* of item types currently supported by canvases.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tk_ItemType *
Tk_GetItemTypes()
{
if (typeList == NULL) {
InitCanvas();
}
return typeList;
}
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/*
*--------------------------------------------------------------
*
* InitCanvas --
*
* This procedure is invoked to perform once-only-ever
* initialization for the module, such as setting up
* the type table.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static void
InitCanvas()
{
if (typeList != NULL) {
return;
}
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typeList = &tkRectangleType;
tkRectangleType.nextPtr = &tkTextType;
tkTextType.nextPtr = &tkLineType;
tkLineType.nextPtr = &tkPolygonType;
tkPolygonType.nextPtr = &tkImageType;
tkImageType.nextPtr = &tkOvalType;
tkOvalType.nextPtr = &tkBitmapType;
tkBitmapType.nextPtr = &tkArcType;
tkArcType.nextPtr = &tkWindowType;
tkWindowType.nextPtr = NULL;
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allUid = Tk_GetUid("all");
currentUid = Tk_GetUid("current");
}
/*
*--------------------------------------------------------------
*
* StartTagSearch --
*
* This procedure is called to initiate an enumeration of
* all items in a given canvas that contain a given tag.
*
* Results:
* The return value is a pointer to the first item in
* canvasPtr that matches tag, or NULL if there is no
* such item. The information at *searchPtr is initialized
* such that successive calls to NextItem will return
* successive items that match tag.
*
* Side effects:
* SearchPtr is linked into a list of searches in progress
* on canvasPtr, so that elements can safely be deleted
* while the search is in progress. EndTagSearch must be
* called at the end of the search to unlink searchPtr from
* this list.
*
*--------------------------------------------------------------
*/
static Tk_Item *
StartTagSearch(canvasPtr, tag, searchPtr)
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TkCanvas *canvasPtr; /* Canvas whose items are to be
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* searched. */
char *tag; /* String giving tag value. */
TagSearch *searchPtr; /* Record describing tag search;
* will be initialized here. */
{
int id;
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Tk_Item *itemPtr, *prevPtr;
Tk_Uid *tagPtr;
Tk_Uid uid;
int count;
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/*
* Initialize the search.
*/
searchPtr->canvasPtr = canvasPtr;
searchPtr->searchOver = 0;
/*
* Find the first matching item in one of several ways. If the tag
* is a number then it selects the single item with the matching
* identifier. In this case see if the item being requested is the
* hot item, in which case the search can be skipped.
*/
if (isdigit(UCHAR(*tag))) {
char *end;
numIdSearches++;
id = strtoul(tag, &end, 0);
if (*end == 0) {
itemPtr = canvasPtr->hotPtr;
prevPtr = canvasPtr->hotPrevPtr;
if ((itemPtr == NULL) || (itemPtr->id != id) || (prevPtr == NULL)
|| (prevPtr->nextPtr != itemPtr)) {
numSlowSearches++;
for (prevPtr = NULL, itemPtr = canvasPtr->firstItemPtr;
itemPtr != NULL;
prevPtr = itemPtr, itemPtr = itemPtr->nextPtr) {
if (itemPtr->id == id) {
break;
}
}
}
searchPtr->prevPtr = prevPtr;
searchPtr->searchOver = 1;
canvasPtr->hotPtr = itemPtr;
canvasPtr->hotPrevPtr = prevPtr;
return itemPtr;
}
}
searchPtr->tag = uid = Tk_GetUid(tag);
if (uid == allUid) {
/*
* All items match.
*/
searchPtr->tag = NULL;
searchPtr->prevPtr = NULL;
searchPtr->currentPtr = canvasPtr->firstItemPtr;
return canvasPtr->firstItemPtr;
}
/*
* None of the above. Search for an item with a matching tag.
*/
for (prevPtr = NULL, itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
prevPtr = itemPtr, itemPtr = itemPtr->nextPtr) {
for (tagPtr = itemPtr->tagPtr, count = itemPtr->numTags;
count > 0; tagPtr++, count--) {
if (*tagPtr == uid) {
searchPtr->prevPtr = prevPtr;
searchPtr->currentPtr = itemPtr;
return itemPtr;
}
}
}
searchPtr->prevPtr = prevPtr;
searchPtr->searchOver = 1;
return NULL;
}
/*
*--------------------------------------------------------------
*
* NextItem --
*
* This procedure returns successive items that match a given
* tag; it should be called only after StartTagSearch has been
* used to begin a search.
*
* Results:
* The return value is a pointer to the next item that matches
* the tag specified to StartTagSearch, or NULL if no such
* item exists. *SearchPtr is updated so that the next call
* to this procedure will return the next item.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static Tk_Item *
NextItem(searchPtr)
TagSearch *searchPtr; /* Record describing search in
* progress. */
{
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Tk_Item *itemPtr, *prevPtr;
int count;
Tk_Uid uid;
Tk_Uid *tagPtr;
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/*
* Find next item in list (this may not actually be a suitable
* one to return), and return if there are no items left.
*/
prevPtr = searchPtr->prevPtr;
if (prevPtr == NULL) {
itemPtr = searchPtr->canvasPtr->firstItemPtr;
} else {
itemPtr = prevPtr->nextPtr;
}
if ((itemPtr == NULL) || (searchPtr->searchOver)) {
searchPtr->searchOver = 1;
return NULL;
}
if (itemPtr != searchPtr->currentPtr) {
/*
* The structure of the list has changed. Probably the
* previously-returned item was removed from the list.
* In this case, don't advance prevPtr; just return
* its new successor (i.e. do nothing here).
*/
} else {
prevPtr = itemPtr;
itemPtr = prevPtr->nextPtr;
}
/*
* Handle special case of "all" search by returning next item.
*/
uid = searchPtr->tag;
if (uid == NULL) {
searchPtr->prevPtr = prevPtr;
searchPtr->currentPtr = itemPtr;
return itemPtr;
}
/*
* Look for an item with a particular tag.
*/
for ( ; itemPtr != NULL; prevPtr = itemPtr, itemPtr = itemPtr->nextPtr) {
for (tagPtr = itemPtr->tagPtr, count = itemPtr->numTags;
count > 0; tagPtr++, count--) {
if (*tagPtr == uid) {
searchPtr->prevPtr = prevPtr;
searchPtr->currentPtr = itemPtr;
return itemPtr;
}
}
}
searchPtr->prevPtr = prevPtr;
searchPtr->searchOver = 1;
return NULL;
}
/*
*--------------------------------------------------------------
*
* DoItem --
*
* This is a utility procedure called by FindItems. It
* either adds itemPtr's id to the result forming in interp,
* or it adds a new tag to itemPtr, depending on the value
* of tag.
*
* Results:
* None.
*
* Side effects:
* If tag is NULL then itemPtr's id is added as a list element
* to interp->result; otherwise tag is added to itemPtr's
* list of tags.
*
*--------------------------------------------------------------
*/
static void
DoItem(interp, itemPtr, tag)
Tcl_Interp *interp; /* Interpreter in which to (possibly)
* record item id. */
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Tk_Item *itemPtr; /* Item to (possibly) modify. */
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Tk_Uid tag; /* Tag to add to those already
* present for item, or NULL. */
{
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Tk_Uid *tagPtr;
int count;
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/*
* Handle the "add-to-result" case and return, if appropriate.
*/
if (tag == NULL) {
char msg[30];
sprintf(msg, "%d", itemPtr->id);
Tcl_AppendElement(interp, msg);
return;
}
for (tagPtr = itemPtr->tagPtr, count = itemPtr->numTags;
count > 0; tagPtr++, count--) {
if (tag == *tagPtr) {
return;
}
}
/*
* Grow the tag space if there's no more room left in the current
* block.
*/
if (itemPtr->tagSpace == itemPtr->numTags) {
Tk_Uid *newTagPtr;
itemPtr->tagSpace += 5;
newTagPtr = (Tk_Uid *) ckalloc((unsigned)
(itemPtr->tagSpace * sizeof(Tk_Uid)));
memcpy((VOID *) newTagPtr, (VOID *) itemPtr->tagPtr,
(itemPtr->numTags * sizeof(Tk_Uid)));
if (itemPtr->tagPtr != itemPtr->staticTagSpace) {
ckfree((char *) itemPtr->tagPtr);
}
itemPtr->tagPtr = newTagPtr;
tagPtr = &itemPtr->tagPtr[itemPtr->numTags];
}
/*
* Add in the new tag.
*/
*tagPtr = tag;
itemPtr->numTags++;
}
/*
*--------------------------------------------------------------
*
* FindItems --
*
* This procedure does all the work of implementing the
* "find" and "addtag" options of the canvas widget command,
* which locate items that have certain features (location,
* tags, position in display list, etc.).
*
* Results:
* A standard Tcl return value. If newTag is NULL, then a
* list of ids from all the items that match argc/argv is
* returned in interp->result. If newTag is NULL, then
* the normal interp->result is an empty string. If an error
* occurs, then interp->result will hold an error message.
*
* Side effects:
* If newTag is non-NULL, then all the items that match the
* information in argc/argv have that tag added to their
* lists of tags.
*
*--------------------------------------------------------------
*/
static int
FindItems(interp, canvasPtr, argc, argv, newTag, cmdName, option)
Tcl_Interp *interp; /* Interpreter for error reporting. */
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TkCanvas *canvasPtr; /* Canvas whose items are to be
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* searched. */
int argc; /* Number of entries in argv. Must be
* greater than zero. */
char **argv; /* Arguments that describe what items
* to search for (see user doc on
* "find" and "addtag" options). */
char *newTag; /* If non-NULL, gives new tag to set
* on all found items; if NULL, then
* ids of found items are returned
* in interp->result. */
char *cmdName; /* Name of original Tcl command, for
* use in error messages. */
char *option; /* For error messages: gives option
* from Tcl command and other stuff
* up to what's in argc/argv. */
{
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int c;
size_t length;
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TagSearch search;
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Tk_Item *itemPtr;
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Tk_Uid uid;
if (newTag != NULL) {
uid = Tk_GetUid(newTag);
} else {
uid = NULL;
}
c = argv[0][0];
length = strlen(argv[0]);
if ((c == 'a') && (strncmp(argv[0], "above", length) == 0)
&& (length >= 2)) {
Tk_Item *lastPtr = NULL;
if (argc != 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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cmdName, option, " above tagOrId", (char *) NULL);
return TCL_ERROR;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[1], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
lastPtr = itemPtr;
}
if ((lastPtr != NULL) && (lastPtr->nextPtr != NULL)) {
DoItem(interp, lastPtr->nextPtr, uid);
}
} else if ((c == 'a') && (strncmp(argv[0], "all", length) == 0)
&& (length >= 2)) {
if (argc != 1) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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cmdName, option, " all", (char *) NULL);
return TCL_ERROR;
}
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
DoItem(interp, itemPtr, uid);
}
} else if ((c == 'b') && (strncmp(argv[0], "below", length) == 0)) {
if (argc != 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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cmdName, option, " below tagOrId", (char *) NULL);
return TCL_ERROR;
}
itemPtr = StartTagSearch(canvasPtr, argv[1], &search);
if (search.prevPtr != NULL) {
DoItem(interp, search.prevPtr, uid);
}
} else if ((c == 'c') && (strncmp(argv[0], "closest", length) == 0)) {
double closestDist;
Tk_Item *startPtr, *closestPtr;
double coords[2], halo;
int x1, y1, x2, y2;
if ((argc < 3) || (argc > 5)) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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cmdName, option, " closest x y ?halo? ?start?",
(char *) NULL);
return TCL_ERROR;
}
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if ((Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr, argv[1],
&coords[0]) != TCL_OK) || (Tk_CanvasGetCoord(interp,
(Tk_Canvas) canvasPtr, argv[2], &coords[1]) != TCL_OK)) {
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return TCL_ERROR;
}
if (argc > 3) {
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if (Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr, argv[3],
&halo) != TCL_OK) {
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return TCL_ERROR;
}
if (halo < 0.0) {
Tcl_AppendResult(interp, "can't have negative halo value \"",
argv[3], "\"", (char *) NULL);
return TCL_ERROR;
}
} else {
halo = 0.0;
}
/*
* Find the item at which to start the search.
*/
startPtr = canvasPtr->firstItemPtr;
if (argc == 5) {
itemPtr = StartTagSearch(canvasPtr, argv[4], &search);
if (itemPtr != NULL) {
startPtr = itemPtr;
}
}
/*
* The code below is optimized so that it can eliminate most
* items without having to call their item-specific procedures.
* This is done by keeping a bounding box (x1, y1, x2, y2) that
* an item's bbox must overlap if the item is to have any
* chance of being closer than the closest so far.
*/
itemPtr = startPtr;
if (itemPtr == NULL) {
return TCL_OK;
}
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closestDist = (*itemPtr->typePtr->pointProc)((Tk_Canvas) canvasPtr,
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itemPtr, coords) - halo;
if (closestDist < 0.0) {
closestDist = 0.0;
}
while (1) {
double newDist;
/*
* Update the bounding box using itemPtr, which is the
* new closest item.
*/
x1 = (coords[0] - closestDist - halo - 1);
y1 = (coords[1] - closestDist - halo - 1);
x2 = (coords[0] + closestDist + halo + 1);
y2 = (coords[1] + closestDist + halo + 1);
closestPtr = itemPtr;
/*
* Search for an item that beats the current closest one.
* Work circularly through the canvas's item list until
* getting back to the starting item.
*/
while (1) {
itemPtr = itemPtr->nextPtr;
if (itemPtr == NULL) {
itemPtr = canvasPtr->firstItemPtr;
}
if (itemPtr == startPtr) {
DoItem(interp, closestPtr, uid);
return TCL_OK;
}
if ((itemPtr->x1 >= x2) || (itemPtr->x2 <= x1)
|| (itemPtr->y1 >= y2) || (itemPtr->y2 <= y1)) {
continue;
}
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newDist = (*itemPtr->typePtr->pointProc)((Tk_Canvas) canvasPtr,
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itemPtr, coords) - halo;
if (newDist < 0.0) {
newDist = 0.0;
}
if (newDist <= closestDist) {
closestDist = newDist;
break;
}
}
}
} else if ((c == 'e') && (strncmp(argv[0], "enclosed", length) == 0)) {
if (argc != 5) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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cmdName, option, " enclosed x1 y1 x2 y2", (char *) NULL);
return TCL_ERROR;
}
return FindArea(interp, canvasPtr, argv+1, uid, 1);
} else if ((c == 'o') && (strncmp(argv[0], "overlapping", length) == 0)) {
if (argc != 5) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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cmdName, option, " overlapping x1 y1 x2 y2",
(char *) NULL);
return TCL_ERROR;
}
return FindArea(interp, canvasPtr, argv+1, uid, 0);
} else if ((c == 'w') && (strncmp(argv[0], "withtag", length) == 0)) {
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if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
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cmdName, option, " withtag tagOrId", (char *) NULL);
return TCL_ERROR;
}
for (itemPtr = StartTagSearch(canvasPtr, argv[1], &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
DoItem(interp, itemPtr, uid);
}
} else {
Tcl_AppendResult(interp, "bad search command \"", argv[0],
"\": must be above, all, below, closest, enclosed, ",
"overlapping, or withtag", (char *) NULL);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* FindArea --
*
* This procedure implements area searches for the "find"
* and "addtag" options.
*
* Results:
* A standard Tcl return value. If newTag is NULL, then a
* list of ids from all the items overlapping or enclosed
* by the rectangle given by argc is returned in interp->result.
* If newTag is NULL, then the normal interp->result is an
* empty string. If an error occurs, then interp->result will
* hold an error message.
*
* Side effects:
* If uid is non-NULL, then all the items overlapping
* or enclosed by the area in argv have that tag added to
* their lists of tags.
*
*--------------------------------------------------------------
*/
static int
FindArea(interp, canvasPtr, argv, uid, enclosed)
Tcl_Interp *interp; /* Interpreter for error reporting
* and result storing. */
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TkCanvas *canvasPtr; /* Canvas whose items are to be
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* searched. */
char **argv; /* Array of four arguments that
* give the coordinates of the
* rectangular area to search. */
Tk_Uid uid; /* If non-NULL, gives new tag to set
* on all found items; if NULL, then
* ids of found items are returned
* in interp->result. */
int enclosed; /* 0 means overlapping or enclosed
* items are OK, 1 means only enclosed
* items are OK. */
{
double rect[4], tmp;
int x1, y1, x2, y2;
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Tk_Item *itemPtr;
if ((Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr, argv[0],
&rect[0]) != TCL_OK)
|| (Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr, argv[1],
&rect[1]) != TCL_OK)
|| (Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr, argv[2],
&rect[2]) != TCL_OK)
|| (Tk_CanvasGetCoord(interp, (Tk_Canvas) canvasPtr, argv[3],
&rect[3]) != TCL_OK)) {
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return TCL_ERROR;
}
if (rect[0] > rect[2]) {
tmp = rect[0]; rect[0] = rect[2]; rect[2] = tmp;
}
if (rect[1] > rect[3]) {
tmp = rect[1]; rect[1] = rect[3]; rect[3] = tmp;
}
/*
* Use an integer bounding box for a quick test, to avoid
* calling item-specific code except for items that are close.
*/
x1 = (rect[0]-1.0);
y1 = (rect[1]-1.0);
x2 = (rect[2]+1.0);
y2 = (rect[3]+1.0);
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if ((itemPtr->x1 >= x2) || (itemPtr->x2 <= x1)
|| (itemPtr->y1 >= y2) || (itemPtr->y2 <= y1)) {
continue;
}
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if ((*itemPtr->typePtr->areaProc)((Tk_Canvas) canvasPtr, itemPtr, rect)
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>= enclosed) {
DoItem(interp, itemPtr, uid);
}
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* RelinkItems --
*
* Move one or more items to a different place in the
* display order for a canvas.
*
* Results:
* None.
*
* Side effects:
* The items identified by "tag" are moved so that they
* are all together in the display list and immediately
* after prevPtr. The order of the moved items relative
* to each other is not changed.
*
*--------------------------------------------------------------
*/
static void
RelinkItems(canvasPtr, tag, prevPtr)
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TkCanvas *canvasPtr; /* Canvas to be modified. */
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char *tag; /* Tag identifying items to be moved
* in the redisplay list. */
Tk_Item *prevPtr; /* Reposition the items so that they
* go just after this item (NULL means
* put at beginning of list). */
{
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Tk_Item *itemPtr;
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TagSearch search;
Tk_Item *firstMovePtr, *lastMovePtr;
/*
* Find all of the items to be moved and remove them from
* the list, making an auxiliary list running from firstMovePtr
* to lastMovePtr. Record their areas for redisplay.
*/
firstMovePtr = lastMovePtr = NULL;
for (itemPtr = StartTagSearch(canvasPtr, tag, &search);
itemPtr != NULL; itemPtr = NextItem(&search)) {
if (itemPtr == prevPtr) {
/*
* Item after which insertion is to occur is being
* moved! Switch to insert after its predecessor.
*/
prevPtr = search.prevPtr;
}
if (search.prevPtr == NULL) {
canvasPtr->firstItemPtr = itemPtr->nextPtr;
} else {
search.prevPtr->nextPtr = itemPtr->nextPtr;
}
if (canvasPtr->lastItemPtr == itemPtr) {
canvasPtr->lastItemPtr = search.prevPtr;
}
if (firstMovePtr == NULL) {
firstMovePtr = itemPtr;
} else {
lastMovePtr->nextPtr = itemPtr;
}
lastMovePtr = itemPtr;
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Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr, itemPtr->x1, itemPtr->y1,
2024-05-27 16:13:40 +02:00
itemPtr->x2, itemPtr->y2);
canvasPtr->flags |= REPICK_NEEDED;
}
/*
* Insert the list of to-be-moved items back into the canvas's
* at the desired position.
*/
if (firstMovePtr == NULL) {
return;
}
if (prevPtr == NULL) {
lastMovePtr->nextPtr = canvasPtr->firstItemPtr;
canvasPtr->firstItemPtr = firstMovePtr;
} else {
lastMovePtr->nextPtr = prevPtr->nextPtr;
prevPtr->nextPtr = firstMovePtr;
}
if (canvasPtr->lastItemPtr == prevPtr) {
canvasPtr->lastItemPtr = lastMovePtr;
}
}
/*
*--------------------------------------------------------------
*
* CanvasBindProc --
*
* This procedure is invoked by the Tk dispatcher to handle
* events associated with bindings on items.
*
* Results:
* None.
*
* Side effects:
* Depends on the command invoked as part of the binding
* (if there was any).
*
*--------------------------------------------------------------
*/
static void
CanvasBindProc(clientData, eventPtr)
ClientData clientData; /* Pointer to canvas structure. */
XEvent *eventPtr; /* Pointer to X event that just
* happened. */
{
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TkCanvas *canvasPtr = (TkCanvas *) clientData;
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Tcl_Preserve((ClientData) canvasPtr);
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/*
* This code below keeps track of the current modifier state in
* canvasPtr>state. This information is used to defer repicks of
* the current item while buttons are down.
*/
if ((eventPtr->type == ButtonPress) || (eventPtr->type == ButtonRelease)) {
int mask;
switch (eventPtr->xbutton.button) {
case Button1:
mask = Button1Mask;
break;
case Button2:
mask = Button2Mask;
break;
case Button3:
mask = Button3Mask;
break;
case Button4:
mask = Button4Mask;
break;
case Button5:
mask = Button5Mask;
break;
default:
mask = 0;
break;
}
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/*
* For button press events, repick the current item using the
* button state before the event, then process the event. For
* button release events, first process the event, then repick
* the current item using the button state *after* the event
* (the button has logically gone up before we change the
* current item).
*/
if (eventPtr->type == ButtonPress) {
/*
* On a button press, first repick the current item using
* the button state before the event, the process the event.
*/
canvasPtr->state = eventPtr->xbutton.state;
PickCurrentItem(canvasPtr, eventPtr);
canvasPtr->state ^= mask;
CanvasDoEvent(canvasPtr, eventPtr);
} else {
/*
* Button release: first process the event, with the button
* still considered to be down. Then repick the current
* item under the assumption that the button is no longer down.
*/
canvasPtr->state = eventPtr->xbutton.state;
CanvasDoEvent(canvasPtr, eventPtr);
eventPtr->xbutton.state ^= mask;
canvasPtr->state = eventPtr->xbutton.state;
PickCurrentItem(canvasPtr, eventPtr);
eventPtr->xbutton.state ^= mask;
}
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goto done;
} else if ((eventPtr->type == EnterNotify)
|| (eventPtr->type == LeaveNotify)) {
canvasPtr->state = eventPtr->xcrossing.state;
PickCurrentItem(canvasPtr, eventPtr);
goto done;
} else if (eventPtr->type == MotionNotify) {
canvasPtr->state = eventPtr->xmotion.state;
PickCurrentItem(canvasPtr, eventPtr);
}
CanvasDoEvent(canvasPtr, eventPtr);
done:
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Tcl_Release((ClientData) canvasPtr);
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}
/*
*--------------------------------------------------------------
*
* PickCurrentItem --
*
* Find the topmost item in a canvas that contains a given
* location and mark the the current item. If the current
* item has changed, generate a fake exit event on the old
* current item and a fake enter event on the new current
* item.
*
* Results:
* None.
*
* Side effects:
* The current item for canvasPtr may change. If it does,
* then the commands associated with item entry and exit
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* could do just about anything. A binding script could
* delete the canvas, so callers should protect themselves
* with Tcl_Preserve and Tcl_Release.
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*
*--------------------------------------------------------------
*/
static void
PickCurrentItem(canvasPtr, eventPtr)
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TkCanvas *canvasPtr; /* Canvas widget in which to select
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* current item. */
XEvent *eventPtr; /* Event describing location of
* mouse cursor. Must be EnterWindow,
* LeaveWindow, ButtonRelease, or
* MotionNotify. */
{
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double coords[2];
int buttonDown;
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/*
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* Check whether or not a button is down. If so, we'll log entry
* and exit into and out of the current item, but not entry into
* any other item. This implements a form of grabbing equivalent
* to what the X server does for windows.
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*/
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buttonDown = canvasPtr->state
& (Button1Mask|Button2Mask|Button3Mask|Button4Mask|Button5Mask);
if (!buttonDown) {
canvasPtr->flags &= ~LEFT_GRABBED_ITEM;
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}
/*
* Save information about this event in the canvas. The event in
* the canvas is used for two purposes:
*
* 1. Event bindings: if the current item changes, fake events are
* generated to allow item-enter and item-leave bindings to trigger.
* 2. Reselection: if the current item gets deleted, can use the
* saved event to find a new current item.
* Translate MotionNotify events into EnterNotify events, since that's
* what gets reported to item handlers.
*/
if (eventPtr != &canvasPtr->pickEvent) {
if ((eventPtr->type == MotionNotify)
|| (eventPtr->type == ButtonRelease)) {
canvasPtr->pickEvent.xcrossing.type = EnterNotify;
canvasPtr->pickEvent.xcrossing.serial = eventPtr->xmotion.serial;
canvasPtr->pickEvent.xcrossing.send_event
= eventPtr->xmotion.send_event;
canvasPtr->pickEvent.xcrossing.display = eventPtr->xmotion.display;
canvasPtr->pickEvent.xcrossing.window = eventPtr->xmotion.window;
canvasPtr->pickEvent.xcrossing.root = eventPtr->xmotion.root;
canvasPtr->pickEvent.xcrossing.subwindow = None;
canvasPtr->pickEvent.xcrossing.time = eventPtr->xmotion.time;
canvasPtr->pickEvent.xcrossing.x = eventPtr->xmotion.x;
canvasPtr->pickEvent.xcrossing.y = eventPtr->xmotion.y;
canvasPtr->pickEvent.xcrossing.x_root = eventPtr->xmotion.x_root;
canvasPtr->pickEvent.xcrossing.y_root = eventPtr->xmotion.y_root;
canvasPtr->pickEvent.xcrossing.mode = NotifyNormal;
canvasPtr->pickEvent.xcrossing.detail = NotifyNonlinear;
canvasPtr->pickEvent.xcrossing.same_screen
= eventPtr->xmotion.same_screen;
canvasPtr->pickEvent.xcrossing.focus = False;
canvasPtr->pickEvent.xcrossing.state = eventPtr->xmotion.state;
} else {
canvasPtr->pickEvent = *eventPtr;
}
}
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/*
* If this is a recursive call (there's already a partially completed
* call pending on the stack; it's in the middle of processing a
* Leave event handler for the old current item) then just return;
* the pending call will do everything that's needed.
*/
if (canvasPtr->flags & REPICK_IN_PROGRESS) {
return;
}
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/*
* A LeaveNotify event automatically means that there's no current
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* object, so the check for closest item can be skipped.
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*/
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coords[0] = canvasPtr->pickEvent.xcrossing.x + canvasPtr->xOrigin;
coords[1] = canvasPtr->pickEvent.xcrossing.y + canvasPtr->yOrigin;
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if (canvasPtr->pickEvent.type != LeaveNotify) {
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canvasPtr->newCurrentPtr = CanvasFindClosest(canvasPtr, coords);
} else {
canvasPtr->newCurrentPtr = NULL;
}
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if ((canvasPtr->newCurrentPtr == canvasPtr->currentItemPtr)
&& !(canvasPtr->flags & LEFT_GRABBED_ITEM)) {
/*
* Nothing to do: the current item hasn't changed.
*/
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return;
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}
/*
* Simulate a LeaveNotify event on the previous current item and
* an EnterNotify event on the new current item. Remove the "current"
* tag from the previous current item and place it on the new current
* item.
*/
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if ((canvasPtr->newCurrentPtr != canvasPtr->currentItemPtr)
&& (canvasPtr->currentItemPtr != NULL)
&& !(canvasPtr->flags & LEFT_GRABBED_ITEM)) {
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XEvent event;
Tk_Item *itemPtr = canvasPtr->currentItemPtr;
int i;
event = canvasPtr->pickEvent;
event.type = LeaveNotify;
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/*
* If the event's detail happens to be NotifyInferior the
* binding mechanism will discard the event. To be consistent,
* always use NotifyAncestor.
*/
event.xcrossing.detail = NotifyAncestor;
canvasPtr->flags |= REPICK_IN_PROGRESS;
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CanvasDoEvent(canvasPtr, &event);
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canvasPtr->flags &= ~REPICK_IN_PROGRESS;
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/*
* The check below is needed because there could be an event
* handler for <LeaveNotify> that deletes the current item.
*/
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if ((itemPtr == canvasPtr->currentItemPtr) && !buttonDown) {
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for (i = itemPtr->numTags-1; i >= 0; i--) {
if (itemPtr->tagPtr[i] == currentUid) {
itemPtr->tagPtr[i] = itemPtr->tagPtr[itemPtr->numTags-1];
itemPtr->numTags--;
break;
}
}
}
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/*
* Note: during CanvasDoEvent above, it's possible that
* canvasPtr->newCurrentPtr got reset to NULL because the
* item was deleted.
*/
}
if ((canvasPtr->newCurrentPtr != canvasPtr->currentItemPtr) && buttonDown) {
canvasPtr->flags |= LEFT_GRABBED_ITEM;
return;
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}
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/*
* Special note: it's possible that canvasPtr->newCurrentPtr ==
* canvasPtr->currentItemPtr here. This can happen, for example,
* if LEFT_GRABBED_ITEM was set.
*/
canvasPtr->flags &= ~LEFT_GRABBED_ITEM;
canvasPtr->currentItemPtr = canvasPtr->newCurrentPtr;
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if (canvasPtr->currentItemPtr != NULL) {
XEvent event;
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DoItem((Tcl_Interp *) NULL, canvasPtr->currentItemPtr, currentUid);
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event = canvasPtr->pickEvent;
event.type = EnterNotify;
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event.xcrossing.detail = NotifyAncestor;
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CanvasDoEvent(canvasPtr, &event);
}
}
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/*
*----------------------------------------------------------------------
*
* CanvasFindClosest --
*
* Given x and y coordinates, find the topmost canvas item that
* is "close" to the coordinates.
*
* Results:
* The return value is a pointer to the topmost item that is
* close to (x,y), or NULL if no item is close.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static Tk_Item *
CanvasFindClosest(canvasPtr, coords)
TkCanvas *canvasPtr; /* Canvas widget to search. */
double coords[2]; /* Desired x,y position in canvas,
* not screen, coordinates.) */
{
Tk_Item *itemPtr;
Tk_Item *bestPtr;
int x1, y1, x2, y2;
x1 = coords[0] - canvasPtr->closeEnough;
y1 = coords[1] - canvasPtr->closeEnough;
x2 = coords[0] + canvasPtr->closeEnough;
y2 = coords[1] + canvasPtr->closeEnough;
bestPtr = NULL;
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if ((itemPtr->x1 > x2) || (itemPtr->x2 < x1)
|| (itemPtr->y1 > y2) || (itemPtr->y2 < y1)) {
continue;
}
if ((*itemPtr->typePtr->pointProc)((Tk_Canvas) canvasPtr,
itemPtr, coords) <= canvasPtr->closeEnough) {
bestPtr = itemPtr;
}
}
return bestPtr;
}
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/*
*--------------------------------------------------------------
*
* CanvasDoEvent --
*
* This procedure is called to invoke binding processing
* for a new event that is associated with the current item
* for a canvas.
*
* Results:
* None.
*
* Side effects:
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* Depends on the bindings for the canvas. A binding script
* could delete the canvas, so callers should protect themselves
* with Tcl_Preserve and Tcl_Release.
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*
*--------------------------------------------------------------
*/
static void
CanvasDoEvent(canvasPtr, eventPtr)
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TkCanvas *canvasPtr; /* Canvas widget in which event
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* occurred. */
XEvent *eventPtr; /* Real or simulated X event that
* is to be processed. */
{
#define NUM_STATIC 3
ClientData staticObjects[NUM_STATIC];
ClientData *objectPtr;
int numObjects, i;
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Tk_Item *itemPtr;
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if (canvasPtr->bindingTable == NULL) {
return;
}
itemPtr = canvasPtr->currentItemPtr;
if ((eventPtr->type == KeyPress) || (eventPtr->type == KeyRelease)) {
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itemPtr = canvasPtr->textInfo.focusItemPtr;
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}
if (itemPtr == NULL) {
return;
}
/*
* Set up an array with all the relevant objects for processing
* this event. The relevant objects are (a) the event's item,
* (b) the tags associated with the event's item, and (c) the
* tag "all". If there are a lot of tags then malloc an array
* to hold all of the objects.
*/
numObjects = itemPtr->numTags + 2;
if (numObjects <= NUM_STATIC) {
objectPtr = staticObjects;
} else {
objectPtr = (ClientData *) ckalloc((unsigned)
(numObjects * sizeof(ClientData)));
}
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objectPtr[0] = (ClientData) allUid;
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for (i = itemPtr->numTags-1; i >= 0; i--) {
objectPtr[i+1] = (ClientData) itemPtr->tagPtr[i];
}
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objectPtr[itemPtr->numTags+1] = (ClientData) itemPtr;
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/*
* Invoke the binding system, then free up the object array if
* it was malloc-ed.
*/
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if (canvasPtr->tkwin != NULL) {
Tk_BindEvent(canvasPtr->bindingTable, eventPtr, canvasPtr->tkwin,
numObjects, objectPtr);
}
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if (objectPtr != staticObjects) {
ckfree((char *) objectPtr);
}
}
/*
*----------------------------------------------------------------------
*
* CanvasBlinkProc --
*
* This procedure is called as a timer handler to blink the
* insertion cursor off and on.
*
* Results:
* None.
*
* Side effects:
* The cursor gets turned on or off, redisplay gets invoked,
* and this procedure reschedules itself.
*
*----------------------------------------------------------------------
*/
static void
CanvasBlinkProc(clientData)
ClientData clientData; /* Pointer to record describing entry. */
{
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TkCanvas *canvasPtr = (TkCanvas *) clientData;
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if (!canvasPtr->textInfo.gotFocus || (canvasPtr->insertOffTime == 0)) {
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return;
}
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if (canvasPtr->textInfo.cursorOn) {
canvasPtr->textInfo.cursorOn = 0;
canvasPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
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canvasPtr->insertOffTime, CanvasBlinkProc,
(ClientData) canvasPtr);
} else {
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canvasPtr->textInfo.cursorOn = 1;
canvasPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
canvasPtr->insertOnTime, CanvasBlinkProc,
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(ClientData) canvasPtr);
}
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if (canvasPtr->textInfo.focusItemPtr != NULL) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->textInfo.focusItemPtr->x1,
canvasPtr->textInfo.focusItemPtr->y1,
canvasPtr->textInfo.focusItemPtr->x2,
canvasPtr->textInfo.focusItemPtr->y2);
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}
}
/*
*----------------------------------------------------------------------
*
* CanvasFocusProc --
*
* This procedure is called whenever a canvas gets or loses the
* input focus. It's also called whenever the window is
* reconfigured while it has the focus.
*
* Results:
* None.
*
* Side effects:
* The cursor gets turned on or off.
*
*----------------------------------------------------------------------
*/
static void
CanvasFocusProc(canvasPtr, gotFocus)
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TkCanvas *canvasPtr; /* Canvas that just got or lost focus. */
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int gotFocus; /* 1 means window is getting focus, 0 means
* it's losing it. */
{
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Tcl_DeleteTimerHandler(canvasPtr->insertBlinkHandler);
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if (gotFocus) {
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canvasPtr->textInfo.gotFocus = 1;
canvasPtr->textInfo.cursorOn = 1;
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if (canvasPtr->insertOffTime != 0) {
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canvasPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
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canvasPtr->insertOffTime, CanvasBlinkProc,
(ClientData) canvasPtr);
}
} else {
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canvasPtr->textInfo.gotFocus = 0;
canvasPtr->textInfo.cursorOn = 0;
canvasPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
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}
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if (canvasPtr->textInfo.focusItemPtr != NULL) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->textInfo.focusItemPtr->x1,
canvasPtr->textInfo.focusItemPtr->y1,
canvasPtr->textInfo.focusItemPtr->x2,
canvasPtr->textInfo.focusItemPtr->y2);
}
if (canvasPtr->highlightWidth > 0) {
canvasPtr->flags |= REDRAW_BORDERS;
if (!(canvasPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayCanvas, (ClientData) canvasPtr);
canvasPtr->flags |= REDRAW_PENDING;
}
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}
}
/*
*----------------------------------------------------------------------
*
* CanvasSelectTo --
*
* Modify the selection by moving its un-anchored end. This could
* make the selection either larger or smaller.
*
* Results:
* None.
*
* Side effects:
* The selection changes.
*
*----------------------------------------------------------------------
*/
static void
CanvasSelectTo(canvasPtr, itemPtr, index)
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TkCanvas *canvasPtr; /* Information about widget. */
Tk_Item *itemPtr; /* Item that is to hold selection. */
int index; /* Index of element that is to become the
* "other" end of the selection. */
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{
int oldFirst, oldLast;
Tk_Item *oldSelPtr;
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oldFirst = canvasPtr->textInfo.selectFirst;
oldLast = canvasPtr->textInfo.selectLast;
oldSelPtr = canvasPtr->textInfo.selItemPtr;
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/*
* Grab the selection if we don't own it already.
*/
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if (canvasPtr->textInfo.selItemPtr == NULL) {
Tk_OwnSelection(canvasPtr->tkwin, XA_PRIMARY, CanvasLostSelection,
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(ClientData) canvasPtr);
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} else if (canvasPtr->textInfo.selItemPtr != itemPtr) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->textInfo.selItemPtr->x1,
canvasPtr->textInfo.selItemPtr->y1,
canvasPtr->textInfo.selItemPtr->x2,
canvasPtr->textInfo.selItemPtr->y2);
}
canvasPtr->textInfo.selItemPtr = itemPtr;
if (canvasPtr->textInfo.anchorItemPtr != itemPtr) {
canvasPtr->textInfo.anchorItemPtr = itemPtr;
canvasPtr->textInfo.selectAnchor = index;
}
if (canvasPtr->textInfo.selectAnchor <= index) {
canvasPtr->textInfo.selectFirst = canvasPtr->textInfo.selectAnchor;
canvasPtr->textInfo.selectLast = index;
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} else {
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canvasPtr->textInfo.selectFirst = index;
canvasPtr->textInfo.selectLast = canvasPtr->textInfo.selectAnchor - 1;
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}
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if ((canvasPtr->textInfo.selectFirst != oldFirst)
|| (canvasPtr->textInfo.selectLast != oldLast)
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|| (itemPtr != oldSelPtr)) {
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Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
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}
}
/*
*--------------------------------------------------------------
*
* CanvasFetchSelection --
*
* This procedure is invoked by Tk to return part or all of
* the selection, when the selection is in a canvas widget.
* This procedure always returns the selection as a STRING.
*
* Results:
* The return value is the number of non-NULL bytes stored
* at buffer. Buffer is filled (or partially filled) with a
* NULL-terminated string containing part or all of the selection,
* as given by offset and maxBytes.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
CanvasFetchSelection(clientData, offset, buffer, maxBytes)
ClientData clientData; /* Information about canvas widget. */
int offset; /* Offset within selection of first
* character to be returned. */
char *buffer; /* Location in which to place
* selection. */
int maxBytes; /* Maximum number of bytes to place
* at buffer, not including terminating
* NULL character. */
{
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TkCanvas *canvasPtr = (TkCanvas *) clientData;
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if (canvasPtr->textInfo.selItemPtr == NULL) {
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return -1;
}
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if (canvasPtr->textInfo.selItemPtr->typePtr->selectionProc == NULL) {
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return -1;
}
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return (*canvasPtr->textInfo.selItemPtr->typePtr->selectionProc)(
(Tk_Canvas) canvasPtr, canvasPtr->textInfo.selItemPtr, offset,
buffer, maxBytes);
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}
/*
*----------------------------------------------------------------------
*
* CanvasLostSelection --
*
* This procedure is called back by Tk when the selection is
* grabbed away from a canvas widget.
*
* Results:
* None.
*
* Side effects:
* The existing selection is unhighlighted, and the window is
* marked as not containing a selection.
*
*----------------------------------------------------------------------
*/
static void
CanvasLostSelection(clientData)
ClientData clientData; /* Information about entry widget. */
{
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TkCanvas *canvasPtr = (TkCanvas *) clientData;
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if (canvasPtr->textInfo.selItemPtr != NULL) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->textInfo.selItemPtr->x1,
canvasPtr->textInfo.selItemPtr->y1,
canvasPtr->textInfo.selItemPtr->x2,
canvasPtr->textInfo.selItemPtr->y2);
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}
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canvasPtr->textInfo.selItemPtr = NULL;
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}
/*
*--------------------------------------------------------------
*
* GridAlign --
*
* Given a coordinate and a grid spacing, this procedure
* computes the location of the nearest grid line to the
* coordinate.
*
* Results:
* The return value is the location of the grid line nearest
* to coord.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static double
GridAlign(coord, spacing)
double coord; /* Coordinate to grid-align. */
double spacing; /* Spacing between grid lines. If <= 0
* then no alignment is done. */
{
if (spacing <= 0.0) {
return coord;
}
if (coord < 0) {
return -((int) ((-coord)/spacing + 0.5)) * spacing;
}
return ((int) (coord/spacing + 0.5)) * spacing;
}
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/*
*----------------------------------------------------------------------
*
* PrintScrollFractions --
*
* Given the range that's visible in the window and the "100%
* range" for what's in the canvas, print a string containing
* the scroll fractions. This procedure is used for both x
* and y scrolling.
*
* Results:
* The memory pointed to by string is modified to hold
* two real numbers containing the scroll fractions (between
* 0 and 1) corresponding to the other arguments.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
PrintScrollFractions(screen1, screen2, object1, object2, string)
int screen1; /* Lowest coordinate visible in the window. */
int screen2; /* Highest coordinate visible in the window. */
int object1; /* Lowest coordinate in the object. */
int object2; /* Highest coordinate in the object. */
char *string; /* Two real numbers get printed here. Must
* have enough storage for two %g
* conversions. */
{
double range, f1, f2;
range = object2 - object1;
if (range <= 0) {
f1 = 0;
f2 = 1.0;
} else {
f1 = (screen1 - object1)/range;
if (f1 < 0) {
f1 = 0.0;
}
f2 = (screen2 - object1)/range;
if (f2 > 1.0) {
f2 = 1.0;
}
if (f2 < f1) {
f2 = f1;
}
}
sprintf(string, "%g %g", f1, f2);
}
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/*
*--------------------------------------------------------------
*
* CanvasUpdateScrollbars --
*
* This procedure is invoked whenever a canvas has changed in
* a way that requires scrollbars to be redisplayed (e.g. the
* view in the canvas has changed).
*
* Results:
* None.
*
* Side effects:
* If there are scrollbars associated with the canvas, then
* their scrolling commands are invoked to cause them to
* redisplay. If errors occur, additional Tcl commands may
* be invoked to process the errors.
*
*--------------------------------------------------------------
*/
static void
CanvasUpdateScrollbars(canvasPtr)
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TkCanvas *canvasPtr; /* Information about canvas. */
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{
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int result;
char buffer[200];
Tcl_Interp *interp;
int xOrigin, yOrigin, inset, width, height, scrollX1, scrollX2,
scrollY1, scrollY2;
char *xScrollCmd, *yScrollCmd;
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/*
* Save all the relevant values from the canvasPtr, because it might be
* deleted as part of either of the two calls to Tcl_VarEval below.
*/
interp = canvasPtr->interp;
Tcl_Preserve((ClientData) interp);
xScrollCmd = canvasPtr->xScrollCmd;
if (xScrollCmd != (char *) NULL) {
Tcl_Preserve((ClientData) xScrollCmd);
}
yScrollCmd = canvasPtr->yScrollCmd;
if (yScrollCmd != (char *) NULL) {
Tcl_Preserve((ClientData) yScrollCmd);
}
xOrigin = canvasPtr->xOrigin;
yOrigin = canvasPtr->yOrigin;
inset = canvasPtr->inset;
width = Tk_Width(canvasPtr->tkwin);
height = Tk_Height(canvasPtr->tkwin);
scrollX1 = canvasPtr->scrollX1;
scrollX2 = canvasPtr->scrollX2;
scrollY1 = canvasPtr->scrollY1;
scrollY2 = canvasPtr->scrollY2;
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canvasPtr->flags &= ~UPDATE_SCROLLBARS;
if (canvasPtr->xScrollCmd != NULL) {
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PrintScrollFractions(xOrigin + inset, xOrigin + width - inset,
scrollX1, scrollX2, buffer);
result = Tcl_VarEval(interp, xScrollCmd, " ", buffer, (char *) NULL);
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if (result != TCL_OK) {
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Tcl_BackgroundError(interp);
}
Tcl_ResetResult(interp);
Tcl_Release((ClientData) xScrollCmd);
}
if (yScrollCmd != NULL) {
PrintScrollFractions(yOrigin + inset, yOrigin + height - inset,
scrollY1, scrollY2, buffer);
result = Tcl_VarEval(interp, yScrollCmd, " ", buffer, (char *) NULL);
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if (result != TCL_OK) {
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Tcl_BackgroundError(interp);
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}
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Tcl_ResetResult(interp);
Tcl_Release((ClientData) yScrollCmd);
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}
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Tcl_Release((ClientData) interp);
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}
/*
*--------------------------------------------------------------
*
* CanvasSetOrigin --
*
* This procedure is invoked to change the mapping between
* canvas coordinates and screen coordinates in the canvas
* window.
*
* Results:
* None.
*
* Side effects:
* The canvas will be redisplayed to reflect the change in
* view. In addition, scrollbars will be updated if there
* are any.
*
*--------------------------------------------------------------
*/
static void
CanvasSetOrigin(canvasPtr, xOrigin, yOrigin)
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TkCanvas *canvasPtr; /* Information about canvas. */
int xOrigin; /* New X origin for canvas (canvas x-coord
* corresponding to left edge of canvas
* window). */
int yOrigin; /* New Y origin for canvas (canvas y-coord
* corresponding to top edge of canvas
* window). */
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{
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int left, right, top, bottom, delta;
/*
* If scroll increments have been set, round the window origin
* to the nearest multiple of the increments. Remember, the
* origin is the place just inside the borders, not the upper
* left corner.
*/
if (canvasPtr->xScrollIncrement > 0) {
if (xOrigin >= 0) {
xOrigin += canvasPtr->xScrollIncrement/2;
xOrigin -= (xOrigin + canvasPtr->inset)
% canvasPtr->xScrollIncrement;
} else {
xOrigin = (-xOrigin) + canvasPtr->xScrollIncrement/2;
xOrigin = -(xOrigin - (xOrigin - canvasPtr->inset)
% canvasPtr->xScrollIncrement);
}
}
if (canvasPtr->yScrollIncrement > 0) {
if (yOrigin >= 0) {
yOrigin += canvasPtr->yScrollIncrement/2;
yOrigin -= (yOrigin + canvasPtr->inset)
% canvasPtr->yScrollIncrement;
} else {
yOrigin = (-yOrigin) + canvasPtr->yScrollIncrement/2;
yOrigin = -(yOrigin - (yOrigin - canvasPtr->inset)
% canvasPtr->yScrollIncrement);
}
}
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/*
* Adjust the origin if necessary to keep as much as possible of the
* canvas in the view. The variables left, right, etc. keep track of
* how much extra space there is on each side of the view before it
* will stick out past the scroll region. If one side sticks out past
* the edge of the scroll region, adjust the view to bring that side
* back to the edge of the scrollregion (but don't move it so much that
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* the other side sticks out now). If scroll increments are in effect,
* be sure to adjust only by full increments.
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*/
if ((canvasPtr->confine) && (canvasPtr->regionString != NULL)) {
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left = xOrigin + canvasPtr->inset - canvasPtr->scrollX1;
right = canvasPtr->scrollX2
- (xOrigin + Tk_Width(canvasPtr->tkwin) - canvasPtr->inset);
top = yOrigin + canvasPtr->inset - canvasPtr->scrollY1;
bottom = canvasPtr->scrollY2
- (yOrigin + Tk_Height(canvasPtr->tkwin) - canvasPtr->inset);
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if ((left < 0) && (right > 0)) {
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delta = (right > -left) ? -left : right;
if (canvasPtr->xScrollIncrement > 0) {
delta -= delta % canvasPtr->xScrollIncrement;
}
xOrigin += delta;
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} else if ((right < 0) && (left > 0)) {
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delta = (left > -right) ? -right : left;
if (canvasPtr->xScrollIncrement > 0) {
delta -= delta % canvasPtr->xScrollIncrement;
}
xOrigin -= delta;
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}
if ((top < 0) && (bottom > 0)) {
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delta = (bottom > -top) ? -top : bottom;
if (canvasPtr->yScrollIncrement > 0) {
delta -= delta % canvasPtr->yScrollIncrement;
}
yOrigin += delta;
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} else if ((bottom < 0) && (top > 0)) {
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delta = (top > -bottom) ? -bottom : top;
if (canvasPtr->yScrollIncrement > 0) {
delta -= delta % canvasPtr->yScrollIncrement;
}
yOrigin -= delta;
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}
}
if ((xOrigin == canvasPtr->xOrigin) && (yOrigin == canvasPtr->yOrigin)) {
return;
}
/*
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* Tricky point: must redisplay not only everything that's visible
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* in the window's final configuration, but also everything that was
* visible in the initial configuration. This is needed because some
* item types, like windows, need to know when they move off-screen
* so they can explicitly undisplay themselves.
*/
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Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->xOrigin, canvasPtr->yOrigin,
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canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
canvasPtr->xOrigin = xOrigin;
canvasPtr->yOrigin = yOrigin;
canvasPtr->flags |= UPDATE_SCROLLBARS;
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Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->xOrigin, canvasPtr->yOrigin,
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canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
}