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archie/tk3.6/tkScrollbar.c

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Intial commit
2024-05-27 16:13:40 +02:00
/*
* tkScrollbar.c --
*
* This module implements a scrollbar widgets for the Tk
* toolkit. A scrollbar displays a slider and two arrows;
* mouse clicks on features within the scrollbar cause
* scrolling commands to be invoked.
*
* Copyright (c) 1990-1993 The Regents of the University of California.
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#ifndef lint
static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkScrollbar.c,v 1.45 93/10/27 17:13:08 ouster Exp $ SPRITE (Berkeley)";
#endif
#include "tkConfig.h"
#include "default.h"
#include "tkInt.h"
/*
* A data structure of the following type is kept for each scrollbar
* widget managed by this file:
*/
typedef struct {
Tk_Window tkwin; /* Window that embodies the scrollbar. NULL
* means that the window has been destroyed
* but the data structures haven't yet been
* cleaned up.*/
Display *display; /* Display containing widget. Used, among
* other things, so that resources can be
* freed even after tkwin has gone away. */
Tcl_Interp *interp; /* Interpreter associated with scrollbar. */
Tk_Uid orientUid; /* Orientation for window ("vertical" or
* "horizontal"). */
int vertical; /* Non-zero means vertical orientation
* requested, zero means horizontal. */
int width; /* Desired narrow dimension of scrollbar,
* in pixels. */
char *command; /* Command prefix to use when invoking
* scrolling commands. NULL means don't
* invoke commands. Malloc'ed. */
int commandSize; /* Number of non-NULL bytes in command. */
int repeatDelay; /* How long to wait before auto-repeating
* on scrolling actions (in ms). */
int repeatInterval; /* Interval between autorepeats (in ms). */
/*
* Information used when displaying widget:
*/
int borderWidth; /* Width of 3-D borders. */
Tk_3DBorder bgBorder; /* Used for drawing background. */
Tk_3DBorder fgBorder; /* For drawing foreground shapes. */
Tk_3DBorder activeBorder; /* For drawing foreground shapes when
* active (i.e. when mouse is positioned
* over element). NULL means use fgBorder. */
GC copyGC; /* Used for copying from pixmap onto screen. */
int relief; /* Indicates whether window as a whole is
* raised, sunken, or flat. */
int offset; /* Zero if relief is TK_RELIEF_FLAT,
* borderWidth otherwise. Indicates how
* much interior stuff must be offset from
* outside edges to leave room for border. */
int arrowLength; /* Length of arrows along long dimension of
* scrollbar. Recomputed on window size
* changes. */
int sliderFirst; /* Pixel coordinate of top or left edge
* of slider area, including border. */
int sliderLast; /* Coordinate of pixel just after bottom
* or right edge of slider area, including
* border. */
int mouseField; /* Indicates which scrollbar element is
* under mouse (e.g. TOP_ARROW; see below
* for possible values). */
int pressField; /* Field in which button was pressed, or -1
* if no button is down. */
int pressPos; /* Position of mouse when button was
* pressed (y for vertical scrollbar, x
* for horizontal). */
int pressFirstUnit; /* Value of "firstUnit" when mouse button
* was pressed. */
/*
* Information describing the application related to the scrollbar.
* This information is provided by the application by invoking the
* "set" widget command.
*/
int totalUnits; /* Total dimension of application, in
* units. */
int windowUnits; /* Maximum number of units that can
* be displayed in the window at
* once. */
int firstUnit; /* Number of last unit visible in
* application's window. */
int lastUnit; /* Index of last unit visible in window. */
/*
* Miscellaneous information:
*/
Cursor cursor; /* Current cursor for window, or None. */
Tk_TimerToken autoRepeat; /* Token for auto-repeat that's
* currently in progress. NULL means no
* auto-repeat in progress. */
int flags; /* Various flags; see below for
* definitions. */
} Scrollbar;
/*
* Legal values for "mouseField" field of Scrollbar structures. These
* are also the return values from the ScrollbarPosition procedure.
*/
#define TOP_ARROW 1
#define TOP_GAP 2
#define SLIDER 3
#define BOTTOM_GAP 4
#define BOTTOM_ARROW 5
#define OUTSIDE 6
/*
* Flag bits for scrollbars:
*
* REDRAW_PENDING: Non-zero means a DoWhenIdle handler
* has already been queued to redraw
* this window.
*/
#define REDRAW_PENDING 1
/*
* Minimum slider length, in pixels (designed to make sure that the slider
* is always easy to grab with the mouse).
*/
#define MIN_SLIDER_LENGTH 5
/*
* Information used for argv parsing.
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_BORDER, "-activeforeground", "activeForeground", "Background",
DEF_SCROLLBAR_ACTIVE_FG_COLOR, Tk_Offset(Scrollbar, activeBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-activeforeground", "activeForeground", "Background",
DEF_SCROLLBAR_ACTIVE_FG_MONO, Tk_Offset(Scrollbar, activeBorder),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_SCROLLBAR_BG_COLOR, Tk_Offset(Scrollbar, bgBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_SCROLLBAR_BG_MONO, Tk_Offset(Scrollbar, bgBorder),
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",
DEF_SCROLLBAR_BORDER_WIDTH, Tk_Offset(Scrollbar, borderWidth), 0},
{TK_CONFIG_STRING, "-command", "command", "Command",
DEF_SCROLLBAR_COMMAND, Tk_Offset(Scrollbar, command),
TK_CONFIG_NULL_OK},
{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
DEF_SCROLLBAR_CURSOR, Tk_Offset(Scrollbar, cursor), TK_CONFIG_NULL_OK},
{TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_BORDER, "-foreground", "foreground", "Foreground",
DEF_SCROLLBAR_FG_COLOR, Tk_Offset(Scrollbar, fgBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-foreground", "foreground", "Foreground",
DEF_SCROLLBAR_FG_MONO, Tk_Offset(Scrollbar, fgBorder),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_UID, "-orient", "orient", "Orient",
DEF_SCROLLBAR_ORIENT, Tk_Offset(Scrollbar, orientUid), 0},
{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
DEF_SCROLLBAR_RELIEF, Tk_Offset(Scrollbar, relief), 0},
{TK_CONFIG_INT, "-repeatdelay", "repeatDelay", "RepeatDelay",
DEF_SCROLLBAR_REPEAT_DELAY, Tk_Offset(Scrollbar, repeatDelay), 0},
{TK_CONFIG_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",
DEF_SCROLLBAR_REPEAT_INTERVAL, Tk_Offset(Scrollbar, repeatInterval), 0},
{TK_CONFIG_PIXELS, "-width", "width", "Width",
DEF_SCROLLBAR_WIDTH, Tk_Offset(Scrollbar, width), 0},
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* Forward declarations for procedures defined later in this file:
*/
static void ComputeScrollbarGeometry _ANSI_ARGS_((
Scrollbar *scrollPtr));
static int ConfigureScrollbar _ANSI_ARGS_((Tcl_Interp *interp,
Scrollbar *scrollPtr, int argc, char **argv,
int flags));
static void DestroyScrollbar _ANSI_ARGS_((ClientData clientData));
static void DisplayScrollbar _ANSI_ARGS_((ClientData clientData));
static void EventuallyRedraw _ANSI_ARGS_((Scrollbar *scrollPtr));
static void ScrollbarEventProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static void ScrollbarMouseProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static void ScrollbarNewField _ANSI_ARGS_((Scrollbar *scrollPtr,
int field));
static int ScrollbarPosition _ANSI_ARGS_((Scrollbar *scrollPtr,
int x, int y));
static void ScrollbarTimerProc _ANSI_ARGS_((
ClientData clientData));
static int ScrollbarWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *, int argc, char **argv));
static void ScrollCmd _ANSI_ARGS_((Scrollbar *scrollPtr,
int unit));
/*
*--------------------------------------------------------------
*
* Tk_ScrollbarCmd --
*
* This procedure is invoked to process the "scrollbar" 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_ScrollbarCmd(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;
register Scrollbar *scrollPtr;
Tk_Window new;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
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 ConfigureScrollbar,
* or which ConfigureScrollbar expects to have reasonable values
* (e.g. resource pointers).
*/
scrollPtr = (Scrollbar *) ckalloc(sizeof(Scrollbar));
scrollPtr->tkwin = new;
scrollPtr->display = Tk_Display(new);
scrollPtr->interp = interp;
scrollPtr->orientUid = NULL;
scrollPtr->vertical = 0;
scrollPtr->width = 0;
scrollPtr->command = NULL;
scrollPtr->commandSize = 0;
scrollPtr->repeatDelay = 0;
scrollPtr->repeatInterval = 0;
scrollPtr->borderWidth = 0;
scrollPtr->bgBorder = NULL;
scrollPtr->fgBorder = NULL;
scrollPtr->activeBorder = NULL;
scrollPtr->copyGC = None;
scrollPtr->relief = TK_RELIEF_FLAT;
scrollPtr->offset = 0;
scrollPtr->arrowLength = 0;
scrollPtr->sliderFirst = 0;
scrollPtr->sliderLast = 0;
scrollPtr->mouseField = OUTSIDE;
scrollPtr->pressField = -1;
scrollPtr->pressPos = 0;
scrollPtr->pressFirstUnit = 0;
scrollPtr->totalUnits = 0;
scrollPtr->windowUnits = 0;
scrollPtr->firstUnit = 0;
scrollPtr->lastUnit = 0;
scrollPtr->cursor = None;
scrollPtr->autoRepeat = NULL;
scrollPtr->flags = 0;
Tk_SetClass(scrollPtr->tkwin, "Scrollbar");
Tk_CreateEventHandler(scrollPtr->tkwin, ExposureMask|StructureNotifyMask,
ScrollbarEventProc, (ClientData) scrollPtr);
Tk_CreateEventHandler(scrollPtr->tkwin, EnterWindowMask|LeaveWindowMask
|PointerMotionMask|ButtonPressMask|ButtonReleaseMask,
ScrollbarMouseProc, (ClientData) scrollPtr);
Tcl_CreateCommand(interp, Tk_PathName(scrollPtr->tkwin), ScrollbarWidgetCmd,
(ClientData) scrollPtr, (void (*)()) NULL);
if (ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
interp->result = Tk_PathName(scrollPtr->tkwin);
return TCL_OK;
error:
Tk_DestroyWindow(scrollPtr->tkwin);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* ScrollbarWidgetCmd --
*
* 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
ScrollbarWidgetCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about scrollbar
* widget. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Scrollbar *scrollPtr = (Scrollbar *) clientData;
int result = TCL_OK;
int length;
char c;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " option ?arg arg ...?\"", (char *) NULL);
return TCL_ERROR;
}
Tk_Preserve((ClientData) scrollPtr);
c = argv[1][0];
length = strlen(argv[1]);
if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)) {
if (argc == 2) {
result = Tk_ConfigureInfo(interp, scrollPtr->tkwin, configSpecs,
(char *) scrollPtr, (char *) NULL, 0);
} else if (argc == 3) {
result = Tk_ConfigureInfo(interp, scrollPtr->tkwin, configSpecs,
(char *) scrollPtr, argv[2], 0);
} else {
result = ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2,
TK_CONFIG_ARGV_ONLY);
}
} else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " get\"", (char *) NULL);
goto error;
}
sprintf(interp->result, "%d %d %d %d", scrollPtr->totalUnits,
scrollPtr->windowUnits, scrollPtr->firstUnit,
scrollPtr->lastUnit);
} else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {
int totalUnits, windowUnits, firstUnit, lastUnit;
if (argc != 6) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0],
" set totalUnits windowUnits firstUnit lastUnit\"",
(char *) NULL);
goto error;
}
if (Tcl_GetInt(interp, argv[2], &totalUnits) != TCL_OK) {
goto error;
}
if (totalUnits < 0) {
sprintf(interp->result, "illegal totalUnits %d", totalUnits);
goto error;
}
if (Tcl_GetInt(interp, argv[3], &windowUnits) != TCL_OK) {
goto error;
}
if (windowUnits < 0) {
sprintf(interp->result, "illegal windowUnits %d", windowUnits);
goto error;
}
if (Tcl_GetInt(interp, argv[4], &firstUnit) != TCL_OK) {
goto error;
}
if (Tcl_GetInt(interp, argv[5], &lastUnit) != TCL_OK) {
goto error;
}
if (totalUnits > 0) {
if (lastUnit < firstUnit) {
sprintf(interp->result, "illegal lastUnit %d", lastUnit);
goto error;
}
} else {
firstUnit = lastUnit = 0;
}
scrollPtr->totalUnits = totalUnits;
scrollPtr->windowUnits = windowUnits;
scrollPtr->firstUnit = firstUnit;
scrollPtr->lastUnit = lastUnit;
ComputeScrollbarGeometry(scrollPtr);
EventuallyRedraw(scrollPtr);
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be configure, get, or set", (char *) NULL);
goto error;
}
Tk_Release((ClientData) scrollPtr);
return result;
error:
Tk_Release((ClientData) scrollPtr);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DestroyScrollbar --
*
* This procedure is invoked by Tk_EventuallyFree or Tk_Release
* to clean up the internal structure of a scrollbar at a safe time
* (when no-one is using it anymore).
*
* Results:
* None.
*
* Side effects:
* Everything associated with the scrollbar is freed up.
*
*----------------------------------------------------------------------
*/
static void
DestroyScrollbar(clientData)
ClientData clientData; /* Info about scrollbar widget. */
{
register Scrollbar *scrollPtr = (Scrollbar *) clientData;
/*
* Free up all the stuff that requires special handling, then
* let Tk_FreeOptions handle all the standard option-related
* stuff.
*/
if (scrollPtr->copyGC != None) {
Tk_FreeGC(scrollPtr->display, scrollPtr->copyGC);
}
Tk_FreeOptions(configSpecs, (char *) scrollPtr, scrollPtr->display, 0);
ckfree((char *) scrollPtr);
}
/*
*----------------------------------------------------------------------
*
* ConfigureScrollbar --
*
* This procedure is called to process an argv/argc list, plus
* the Tk option database, in order to configure (or
* reconfigure) a scrollbar 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 scrollPtr; old resources get freed,
* if there were any.
*
*----------------------------------------------------------------------
*/
static int
ConfigureScrollbar(interp, scrollPtr, argc, argv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
register Scrollbar *scrollPtr; /* Information about widget; may or
* may 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. */
{
int length;
XGCValues gcValues;
if (Tk_ConfigureWidget(interp, scrollPtr->tkwin, configSpecs,
argc, argv, (char *) scrollPtr, flags) != TCL_OK) {
return TCL_ERROR;
}
/*
* A few options need special processing, such as parsing the
* orientation or setting the background from a 3-D border.
*/
length = strlen(scrollPtr->orientUid);
if (strncmp(scrollPtr->orientUid, "vertical", length) == 0) {
scrollPtr->vertical = 1;
} else if (strncmp(scrollPtr->orientUid, "horizontal", length) == 0) {
scrollPtr->vertical = 0;
} else {
Tcl_AppendResult(interp, "bad orientation \"", scrollPtr->orientUid,
"\": must be vertical or horizontal", (char *) NULL);
return TCL_ERROR;
}
if (scrollPtr->command != NULL) {
scrollPtr->commandSize = strlen(scrollPtr->command);
} else {
scrollPtr->commandSize = 0;
}
Tk_SetBackgroundFromBorder(scrollPtr->tkwin, scrollPtr->bgBorder);
if (scrollPtr->copyGC == None) {
gcValues.graphics_exposures = False;
scrollPtr->copyGC = Tk_GetGC(scrollPtr->tkwin, GCGraphicsExposures,
&gcValues);
}
/*
* Register the desired geometry for the window (leave enough space
* for the two arrows plus a minimum-size slider, plus border around
* the whole window, if any). Then arrange for the window to be
* redisplayed.
*/
ComputeScrollbarGeometry(scrollPtr);
EventuallyRedraw(scrollPtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* DisplayScrollbar --
*
* This procedure redraws the contents of a scrollbar 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
DisplayScrollbar(clientData)
ClientData clientData; /* Information about window. */
{
register Scrollbar *scrollPtr = (Scrollbar *) clientData;
register Tk_Window tkwin = scrollPtr->tkwin;
XPoint points[7];
Tk_3DBorder border;
int relief, width;
Pixmap pixmap;
if ((scrollPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
goto done;
}
if (scrollPtr->vertical) {
width = Tk_Width(tkwin) - 2*scrollPtr->offset;
} else {
width = Tk_Height(tkwin) - 2*scrollPtr->offset;
}
/*
* In order to avoid screen flashes, this procedure redraws
* the scrollbar in a pixmap, then copies the pixmap to the
* screen in a single operation. This means that there's no
* point in time where the on-sreen image has been cleared.
*/
pixmap = XCreatePixmap(scrollPtr->display, Tk_WindowId(tkwin),
Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
Tk_Fill3DRectangle(scrollPtr->display, pixmap, scrollPtr->bgBorder,
0, 0, Tk_Width(tkwin), Tk_Height(tkwin),
scrollPtr->borderWidth, scrollPtr->relief);
/*
* Draw the top or left arrow. The coordinates of the polygon
* points probably seem odd, but they were carefully chosen with
* respect to X's rules for filling polygons. These point choices
* cause the arrows to just fill the narrow dimension of the
* scrollbar and be properly centered.
*/
if (scrollPtr->mouseField == TOP_ARROW) {
border = scrollPtr->activeBorder;
relief = scrollPtr->pressField == TOP_ARROW ? TK_RELIEF_SUNKEN
: TK_RELIEF_RAISED;
} else {
border = scrollPtr->fgBorder;
relief = TK_RELIEF_RAISED;
}
if (scrollPtr->vertical) {
points[0].x = scrollPtr->offset - 1;
points[0].y = scrollPtr->arrowLength + scrollPtr->offset;
points[1].x = width + scrollPtr->offset;
points[1].y = points[0].y;
points[2].x = width/2 + scrollPtr->offset;
points[2].y = scrollPtr->offset - 1;
Tk_Fill3DPolygon(scrollPtr->display, pixmap, border,
points, 3, scrollPtr->borderWidth, relief);
} else {
points[0].x = scrollPtr->arrowLength + scrollPtr->offset;
points[0].y = scrollPtr->offset - 1;
points[1].x = scrollPtr->offset;
points[1].y = width/2 + scrollPtr->offset;
points[2].x = points[0].x;
points[2].y = width + scrollPtr->offset;
Tk_Fill3DPolygon(scrollPtr->display, pixmap, border,
points, 3, scrollPtr->borderWidth, relief);
}
/*
* Display the bottom or right arrow.
*/
if (scrollPtr->mouseField == BOTTOM_ARROW) {
border = scrollPtr->activeBorder;
relief = scrollPtr->pressField == BOTTOM_ARROW ? TK_RELIEF_SUNKEN
: TK_RELIEF_RAISED;
} else {
border = scrollPtr->fgBorder;
relief = TK_RELIEF_RAISED;
}
if (scrollPtr->vertical) {
points[0].x = scrollPtr->offset;
points[0].y = Tk_Height(tkwin) - scrollPtr->arrowLength
- scrollPtr->offset;
points[1].x = width/2 + scrollPtr->offset;
points[1].y = Tk_Height(tkwin) - scrollPtr->offset;
points[2].x = width + scrollPtr->offset;
points[2].y = points[0].y;
Tk_Fill3DPolygon(scrollPtr->display, pixmap, border,
points, 3, scrollPtr->borderWidth, relief);
} else {
points[0].x = Tk_Width(tkwin) - scrollPtr->arrowLength
- scrollPtr->offset;
points[0].y = scrollPtr->offset - 1;
points[1].x = points[0].x;
points[1].y = width + scrollPtr->offset;
points[2].x = Tk_Width(tkwin) - scrollPtr->offset;
points[2].y = width/2 + scrollPtr->offset;
Tk_Fill3DPolygon(scrollPtr->display, pixmap, border,
points, 3, scrollPtr->borderWidth, relief);
}
/*
* Display the slider.
*/
if (scrollPtr->mouseField == SLIDER) {
border = scrollPtr->activeBorder;
relief = scrollPtr->pressField == SLIDER ? TK_RELIEF_SUNKEN
: TK_RELIEF_RAISED;
} else {
border = scrollPtr->fgBorder;
relief = TK_RELIEF_RAISED;
}
if (scrollPtr->vertical) {
Tk_Fill3DRectangle(scrollPtr->display, pixmap, border,
1 + scrollPtr->offset, scrollPtr->sliderFirst,
width-2, scrollPtr->sliderLast - scrollPtr->sliderFirst,
scrollPtr->borderWidth, relief);
} else {
Tk_Fill3DRectangle(scrollPtr->display, pixmap, border,
scrollPtr->sliderFirst, 1 + scrollPtr->offset,
scrollPtr->sliderLast - scrollPtr->sliderFirst, width-2,
scrollPtr->borderWidth, relief);
}
/*
* Copy the information from the off-screen pixmap onto the screen,
* then delete the pixmap.
*/
XCopyArea(scrollPtr->display, pixmap, Tk_WindowId(tkwin),
scrollPtr->copyGC, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin), 0, 0);
XFreePixmap(scrollPtr->display, pixmap);
done:
scrollPtr->flags &= ~REDRAW_PENDING;
}
/*
*--------------------------------------------------------------
*
* ScrollbarEventProc --
*
* This procedure is invoked by the Tk dispatcher for various
* events on scrollbars.
*
* Results:
* None.
*
* Side effects:
* When the window gets deleted, internal structures get
* cleaned up. When it gets exposed, it is redisplayed.
*
*--------------------------------------------------------------
*/
static void
ScrollbarEventProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
XEvent *eventPtr; /* Information about event. */
{
Scrollbar *scrollPtr = (Scrollbar *) clientData;
if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
EventuallyRedraw(scrollPtr);
} else if (eventPtr->type == DestroyNotify) {
Tcl_DeleteCommand(scrollPtr->interp, Tk_PathName(scrollPtr->tkwin));
scrollPtr->tkwin = NULL;
if (scrollPtr->flags & REDRAW_PENDING) {
Tk_CancelIdleCall(DisplayScrollbar, (ClientData) scrollPtr);
}
Tk_EventuallyFree((ClientData) scrollPtr, DestroyScrollbar);
} else if (eventPtr->type == ConfigureNotify) {
ComputeScrollbarGeometry(scrollPtr);
}
}
/*
*----------------------------------------------------------------------
*
* ComputeScrollbarGeometry --
*
* After changes in a scrollbar's size or configuration, this
* procedure recomputes various geometry information used in
* displaying the scrollbar.
*
* Results:
* None.
*
* Side effects:
* The scrollbar will be displayed differently.
*
*----------------------------------------------------------------------
*/
static void
ComputeScrollbarGeometry(scrollPtr)
register Scrollbar *scrollPtr; /* Scrollbar whose geometry may
* have changed. */
{
int width, fieldLength;
if (scrollPtr->relief == TK_RELIEF_FLAT) {
scrollPtr->offset = 0;
} else {
scrollPtr->offset = scrollPtr->borderWidth;
}
width = (scrollPtr->vertical) ? Tk_Width(scrollPtr->tkwin)
: Tk_Height(scrollPtr->tkwin);
scrollPtr->arrowLength =
(((width - 2*scrollPtr->offset)*173) + 100) / 200;
fieldLength = (scrollPtr->vertical ? Tk_Height(scrollPtr->tkwin)
: Tk_Width(scrollPtr->tkwin))
- 2*(scrollPtr->arrowLength + scrollPtr->offset);
if (fieldLength < 0) {
fieldLength = 0;
}
if (scrollPtr->totalUnits <= 0) {
scrollPtr->sliderFirst = 0;
scrollPtr->sliderLast = fieldLength;
} else {
scrollPtr->sliderFirst = (fieldLength*scrollPtr->firstUnit
+ scrollPtr->totalUnits/2)/scrollPtr->totalUnits;
scrollPtr->sliderLast = (fieldLength*(scrollPtr->lastUnit+1)
+ scrollPtr->totalUnits/2)/scrollPtr->totalUnits;
/*
* Adjust the slider so that some piece of it is always
* displayed in the scrollbar and so that it has at least
* a minimal width (so it can be grabbed with the mouse).
*/
if (scrollPtr->sliderFirst > (fieldLength - 2*scrollPtr->borderWidth)) {
scrollPtr->sliderFirst = fieldLength - 2*scrollPtr->borderWidth;
}
if (scrollPtr->sliderFirst < 0) {
scrollPtr->sliderFirst = 0;
}
if (scrollPtr->sliderLast < (scrollPtr->sliderFirst
+ MIN_SLIDER_LENGTH)) {
scrollPtr->sliderLast = scrollPtr->sliderFirst + MIN_SLIDER_LENGTH;
}
if (scrollPtr->sliderLast > fieldLength) {
scrollPtr->sliderLast = fieldLength;
}
}
scrollPtr->sliderFirst += scrollPtr->arrowLength + scrollPtr->offset;
scrollPtr->sliderLast += scrollPtr->arrowLength + scrollPtr->offset;
/*
* Register the desired geometry for the window (leave enough space
* for the two arrows plus a minimum-size slider, plus border around
* the whole window, if any). Then arrange for the window to be
* redisplayed.
*/
if (scrollPtr->vertical) {
Tk_GeometryRequest(scrollPtr->tkwin,
scrollPtr->width + 2*scrollPtr->offset,
2*(scrollPtr->arrowLength + scrollPtr->borderWidth
+ scrollPtr->offset));
} else {
Tk_GeometryRequest(scrollPtr->tkwin,
2*(scrollPtr->arrowLength + scrollPtr->borderWidth
+ scrollPtr->offset), scrollPtr->width + 2*scrollPtr->offset);
}
Tk_SetInternalBorder(scrollPtr->tkwin, scrollPtr->borderWidth);
}
/*
*--------------------------------------------------------------
*
* ScrollbarPosition --
*
* Determine the scrollbar element corresponding to a
* given position.
*
* Results:
* One of TOP_ARROW, TOP_GAP, etc., indicating which element
* of the scrollbar covers the position given by (x, y). If
* (x,y) is outside the scrollbar entirely, then OUTSIDE is
* returned.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
ScrollbarPosition(scrollPtr, x, y)
register Scrollbar *scrollPtr; /* Scrollbar widget record. */
int x, y; /* Coordinates within scrollPtr's
* window. */
{
int length, width, tmp;
if (scrollPtr->vertical) {
length = Tk_Height(scrollPtr->tkwin);
width = Tk_Width(scrollPtr->tkwin);
} else {
tmp = x;
x = y;
y = tmp;
length = Tk_Width(scrollPtr->tkwin);
width = Tk_Height(scrollPtr->tkwin);
}
if ((x < 0) || (x > width) || (y < 0)) {
return OUTSIDE;
}
/*
* All of the calculations in this procedure mirror those in
* DisplayScrollbar. Be sure to keep the two consistent.
*/
if (y < (scrollPtr->offset + scrollPtr->arrowLength)) {
return TOP_ARROW;
}
if (y < scrollPtr->sliderFirst) {
return TOP_GAP;
}
if (y < scrollPtr->sliderLast) {
return SLIDER;
}
if (y >= (length - (scrollPtr->arrowLength + scrollPtr->offset))) {
return BOTTOM_ARROW;
}
return BOTTOM_GAP;
}
/*
*--------------------------------------------------------------
*
* ScrollbarMouseProc --
*
* This procedure is called back by Tk in response to
* mouse events such as window entry, window exit, mouse
* motion, and button presses.
*
* Results:
* None.
*
* Side effects:
* This procedure implements the "feel" of the scrollbar
* by issuing scrolling commands in response to button presses
* and mouse motion.
*
*--------------------------------------------------------------
*/
static void
ScrollbarMouseProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
register XEvent *eventPtr; /* Information about event. */
{
register Scrollbar *scrollPtr = (Scrollbar *) clientData;
Tk_Preserve((ClientData) scrollPtr);
if (eventPtr->type == EnterNotify) {
if (scrollPtr->pressField == -1) {
ScrollbarNewField(scrollPtr,
ScrollbarPosition(scrollPtr, eventPtr->xcrossing.x,
eventPtr->xcrossing.y));
}
} else if (eventPtr->type == LeaveNotify) {
if (scrollPtr->pressField == -1) {
ScrollbarNewField(scrollPtr, OUTSIDE);
}
} else if (eventPtr->type == MotionNotify) {
if (scrollPtr->pressField == SLIDER) {
int delta, length, newFirst;
if (scrollPtr->vertical) {
delta = eventPtr->xmotion.y - scrollPtr->pressPos;
length = Tk_Height(scrollPtr->tkwin)
- 2*(scrollPtr->arrowLength + scrollPtr->offset);
} else {
delta = eventPtr->xmotion.x - scrollPtr->pressPos;
length = Tk_Width(scrollPtr->tkwin)
- 2*(scrollPtr->arrowLength + scrollPtr->offset);
}
/*
* Do the division with positive numbers to avoid
* differences in negative-number truncation on different
* machines.
*/
if (delta >= 0) {
newFirst = scrollPtr->pressFirstUnit
+ ((delta * scrollPtr->totalUnits) + (length/2))
/ length;
} else {
newFirst = scrollPtr->pressFirstUnit
- (((-delta) * scrollPtr->totalUnits) + (length/2))
/ length;
}
ScrollCmd(scrollPtr, newFirst);
} else if (scrollPtr->pressField == -1) {
ScrollbarNewField(scrollPtr,
ScrollbarPosition(scrollPtr, eventPtr->xmotion.x,
eventPtr->xmotion.y));
}
} else if ((eventPtr->type == ButtonPress)
&& (eventPtr->xbutton.state == 0)) {
/*
* The following procedure call is only necessary for OpenWindows 2.0
* because it seems to send ButtonPress events to scrollbars
* without an EnterNotify or MotionNotify event first (9/23/92).
*/
ScrollbarNewField(scrollPtr,
ScrollbarPosition(scrollPtr, eventPtr->xbutton.x,
eventPtr->xbutton.y));
scrollPtr->pressField = scrollPtr->mouseField;
if (scrollPtr->pressField != SLIDER) {
scrollPtr->autoRepeat = Tk_CreateTimerHandler(
scrollPtr->repeatDelay,
ScrollbarTimerProc, (ClientData) scrollPtr);
}
if (scrollPtr->vertical) {
scrollPtr->pressPos = eventPtr->xbutton.y;
} else {
scrollPtr->pressPos = eventPtr->xbutton.x;
}
scrollPtr->pressFirstUnit = scrollPtr->firstUnit;
if (scrollPtr->pressFirstUnit <= -scrollPtr->windowUnits) {
scrollPtr->pressFirstUnit = 1-scrollPtr->windowUnits;
}
if (scrollPtr->pressFirstUnit >= scrollPtr->totalUnits) {
scrollPtr->pressFirstUnit = scrollPtr->totalUnits-1;
}
EventuallyRedraw(scrollPtr);
} else if (eventPtr->type == ButtonRelease) {
if (scrollPtr->pressField == scrollPtr->mouseField) {
switch (scrollPtr->pressField) {
case TOP_ARROW:
ScrollCmd(scrollPtr, scrollPtr->firstUnit-1);
break;
case TOP_GAP:
if (scrollPtr->windowUnits <= 1) {
ScrollCmd(scrollPtr, scrollPtr->firstUnit - 1);
} else {
ScrollCmd(scrollPtr, scrollPtr->firstUnit
- (scrollPtr->windowUnits-1));
}
break;
case BOTTOM_GAP: {
if (scrollPtr->windowUnits <= 1) {
ScrollCmd(scrollPtr, scrollPtr->firstUnit + 1);
} else {
ScrollCmd(scrollPtr, scrollPtr->firstUnit
+ (scrollPtr->windowUnits-1));
}
break;
}
case BOTTOM_ARROW:
ScrollCmd(scrollPtr, scrollPtr->firstUnit+1);
break;
}
}
if (scrollPtr->autoRepeat != NULL) {
Tk_DeleteTimerHandler(scrollPtr->autoRepeat);
scrollPtr->autoRepeat = NULL;
}
EventuallyRedraw(scrollPtr);
scrollPtr->pressField = -1;
ScrollbarNewField(scrollPtr,
ScrollbarPosition(scrollPtr, eventPtr->xbutton.x,
eventPtr->xbutton.y));
}
Tk_Release((ClientData) scrollPtr);
}
/*
*--------------------------------------------------------------
*
* ScrollCmd --
*
* This procedure takes care of invoking a scrolling Tcl
* command and reporting any error that occurs in it.
*
* Results:
* None.
*
* Side effects:
* A Tcl command is invoked, and an additional error-processing
* command may also be invoked.
*
*--------------------------------------------------------------
*/
static void
ScrollCmd(scrollPtr, unit)
register Scrollbar *scrollPtr; /* Scrollbar from which to issue
* command. */
int unit; /* Unit position within thing being
* being displayed that should appear
* at top or right of screen. */
{
char string[20];
int result;
if ((unit == scrollPtr->firstUnit) || (scrollPtr->command == NULL)) {
return;
}
sprintf(string, " %d", unit);
result = Tcl_VarEval(scrollPtr->interp, scrollPtr->command, string,
(char *) NULL);
if (result != TCL_OK) {
Tcl_AddErrorInfo(scrollPtr->interp,
"\n (scrolling command executed by scrollbar)");
Tk_BackgroundError(scrollPtr->interp);
}
}
/*
*--------------------------------------------------------------
*
* EventuallyRedraw --
*
* Arrange for one or more of the fields of a scrollbar
* to be redrawn.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static void
EventuallyRedraw(scrollPtr)
register Scrollbar *scrollPtr; /* Information about widget. */
{
if ((scrollPtr->tkwin == NULL) || (!Tk_IsMapped(scrollPtr->tkwin))) {
return;
}
if ((scrollPtr->flags & REDRAW_PENDING) == 0) {
Tk_DoWhenIdle(DisplayScrollbar, (ClientData) scrollPtr);
scrollPtr->flags |= REDRAW_PENDING;
}
}
/*
*--------------------------------------------------------------
*
* ScrollbarNewField --
*
* This procedure is called to declare that the mouse is in
* a particular field of the scrollbar (e.g. top arrow), so
* that the field can be highlighed and the previous field
* can be returned to normal display.
*
* Results:
* None.
*
* Side effects:
* Fields may be redisplayed.
*
*--------------------------------------------------------------
*/
static void
ScrollbarNewField(scrollPtr, field)
register Scrollbar *scrollPtr; /* Information about widget. */
int field; /* Identifies field under mouse,
* e.g. TOP_ARROW. */
{
if (field == scrollPtr->mouseField) {
return;
}
EventuallyRedraw(scrollPtr);
scrollPtr->mouseField = field;
}
/*
*--------------------------------------------------------------
*
* ScrollbarTimerProc --
*
* This procedure is invoked as a Tk timer handler for actions
* that auto-repeat (mouse presses in an arrow or gap). It
* performs the auto-repeat action.
*
* Results:
* None.
*
* Side effects:
* Whatever action corresponds to the current mouse button
* is repeated, and this procedure is rescheduled to execute
* again later.
*
*--------------------------------------------------------------
*/
static void
ScrollbarTimerProc(clientData)
ClientData clientData; /* Information about widget. */
{
register Scrollbar *scrollPtr = (Scrollbar *) clientData;
Tk_Preserve((ClientData) scrollPtr);
switch(scrollPtr->pressField) {
case TOP_ARROW:
ScrollCmd(scrollPtr, scrollPtr->firstUnit-1);
break;
case TOP_GAP:
ScrollCmd(scrollPtr, scrollPtr->firstUnit
- (scrollPtr->windowUnits-1));
break;
case BOTTOM_GAP: {
ScrollCmd(scrollPtr, scrollPtr->firstUnit
+ (scrollPtr->windowUnits-1));
break;
}
case BOTTOM_ARROW:
ScrollCmd(scrollPtr, scrollPtr->firstUnit+1);
break;
}
if (scrollPtr->tkwin != NULL) {
scrollPtr->autoRepeat = Tk_CreateTimerHandler(
scrollPtr->repeatInterval, ScrollbarTimerProc,
(ClientData) scrollPtr);
}
Tk_Release((ClientData) scrollPtr);
}
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