1224 lines
37 KiB
C
1224 lines
37 KiB
C
/*
|
||
* tkScrollbar.c --
|
||
*
|
||
* This module implements a scrollbar widgets for the Tk
|
||
* toolkit. A scrollbar displays a slider and two arrows;
|
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* mouse clicks on features within the scrollbar cause
|
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* scrolling commands to be invoked.
|
||
*
|
||
* Copyright (c) 1990-1993 The Regents of the University of California.
|
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* All rights reserved.
|
||
*
|
||
* Permission is hereby granted, without written agreement and without
|
||
* license or royalty fees, to use, copy, modify, and distribute this
|
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* software and its documentation for any purpose, provided that the
|
||
* above copyright notice and the following two paragraphs appear in
|
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* all copies of this software.
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*
|
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* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
|
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
|
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
|
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* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
|
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* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
|
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
|
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* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
|
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
|
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|
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#ifndef lint
|
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static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkScrollbar.c,v 1.45 93/10/27 17:13:08 ouster Exp $ SPRITE (Berkeley)";
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#endif
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|
||
#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
|
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* 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
|
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* 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. */
|
||
|
||
/*
|
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* Information describing the application related to the scrollbar.
|
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* 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",
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||
DEF_SCROLLBAR_ACTIVE_FG_COLOR, Tk_Offset(Scrollbar, activeBorder),
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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},
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||
{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",
|
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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},
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||
{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",
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DEF_SCROLLBAR_WIDTH, Tk_Offset(Scrollbar, width), 0},
|
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{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
|
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(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));
|
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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);
|
||
}
|