/*
* tkScrollbar.c (CTk) --
*
* This module implements a scrollbar widgets for the CTk
* toolkit. A scrollbar displays a slider and two arrows;
* mouse clicks on features within the scrollbar cause
* scrolling commands to be invoked.
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
* Copyright (c) 1994-1995 Cleveland Clinic Foundation
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* @(#) $Id: ctk.shar,v 1.50 1996/01/15 14:47:16 andrewm Exp andrewm $
*/
#include "tkPort.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.*/
Tcl_Interp *interp; /* Interpreter associated with scrollbar. */
Tcl_Command widgetCmd; /* Token for scrollbar's widget command. */
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. */
/*
* Information used when displaying widget:
*/
int borderWidth; /* Width of border in pixels. */
int sliderFirst; /* Character coordinate of top or left edge
* of slider area, including border. */
int sliderLast; /* Coordinate of character just after bottom
* or right edge of slider area, including
* border. */
/*
* Information describing the application related to the scrollbar.
* This information is provided by the application by invoking the
* "set" widget command. This information can now be provided in
* two ways: the "old" form (totalUnits, windowUnits, firstUnit,
* and lastUnit), or the "new" form (firstFraction and lastFraction).
* FirstFraction and lastFraction will always be valid, but
* the old-style information is only valid if the NEW_STYLE_COMMANDS
* flag is 0.
*/
int totalUnits; /* Total dimension of application, in
* units. Valid only if the NEW_STYLE_COMMANDS
* flag isn't set. */
int windowUnits; /* Maximum number of units that can be
* displayed in the window at once. Valid
* only if the NEW_STYLE_COMMANDS flag isn't
* set. */
int firstUnit; /* Number of last unit visible in
* application's window. Valid only if the
* NEW_STYLE_COMMANDS flag isn't set. */
int lastUnit; /* Index of last unit visible in window.
* Valid only if the NEW_STYLE_COMMANDS
* flag isn't set. */
double firstFraction; /* Position of first visible thing in window,
* specified as a fraction between 0 and
* 1.0. */
double lastFraction; /* Position of last visible thing in window,
* specified as a fraction between 0 and
* 1.0. */
/*
* Miscellaneous information:
*/
char *takeFocus; /* Value of -takefocus option; not used in
* the C code, but used by keyboard traversal
* scripts. Malloc'ed, but may be NULL. */
int flags; /* Various flags; see below for
* definitions. */
} Scrollbar;
/*
* Flag bits for scrollbars:
*
* REDRAW_PENDING: Non-zero means a DoWhenIdle handler
* has already been queued to redraw
* this window.
* NEW_STYLE_COMMANDS: Non-zero means the new style of commands
* should be used to communicate with the
* widget: ".t yview scroll 2 lines", instead
* of ".t yview 40", for example.
* GOT_FOCUS: Non-zero means this window has the input
* focus.
*/
#define REDRAW_PENDING 1
#define NEW_STYLE_COMMANDS 2
#define GOT_FOCUS 4
/*
* Minimum slider length and (fixed) arrow length, in characters.
*/
#define MIN_SLIDER_LENGTH 1
#define ARROW_LENGTH 1
/*
* Information used for argv parsing.
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_SYNONYM, "-bd", "borderWidth", (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_UID, "-orient", "orient", "Orient",
DEF_SCROLLBAR_ORIENT, Tk_Offset(Scrollbar, orientUid), 0},
{TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
DEF_SCROLLBAR_TAKE_FOCUS, Tk_Offset(Scrollbar, takeFocus),
TK_CONFIG_NULL_OK},
{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 ScrollbarCmdDeletedProc _ANSI_ARGS_((
ClientData clientData));
static void ScrollbarEventProc _ANSI_ARGS_((ClientData clientData,
Ctk_Event *eventPtr));
static int ScrollbarWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *, int argc, char **argv));
/*
*--------------------------------------------------------------
*
* 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->interp = interp;
scrollPtr->widgetCmd = Tcl_CreateCommand(interp,
Tk_PathName(scrollPtr->tkwin), ScrollbarWidgetCmd,
(ClientData) scrollPtr, ScrollbarCmdDeletedProc);
scrollPtr->orientUid = NULL;
scrollPtr->vertical = 0;
scrollPtr->width = 0;
scrollPtr->command = NULL;
scrollPtr->commandSize = 0;
scrollPtr->borderWidth = 0;
scrollPtr->sliderFirst = 0;
scrollPtr->sliderLast = 0;
scrollPtr->totalUnits = 0;
scrollPtr->windowUnits = 0;
scrollPtr->firstUnit = 0;
scrollPtr->lastUnit = 0;
scrollPtr->firstFraction = 0.0;
scrollPtr->lastFraction = 0.0;
scrollPtr->takeFocus = NULL;
scrollPtr->flags = 0;
Tk_SetClass(scrollPtr->tkwin, "Scrollbar");
Tk_CreateEventHandler(scrollPtr->tkwin,
CTK_EXPOSE_EVENT_MASK|CTK_FOCUS_EVENT_MASK|CTK_MAP_EVENT_MASK
|CTK_DESTROY_EVENT_MASK,
ScrollbarEventProc, (ClientData) scrollPtr);
if (ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
Tcl_SetResult(interp,Tk_PathName(scrollPtr->tkwin),TCL_VOLATILE);
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;
size_t length;
int 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 == 'a') && (strncmp(argv[1], "activate", length) == 0)) {
result = Ctk_Unsupported(interp, "scrollbar activate");
} 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, scrollPtr->tkwin, configSpecs,
(char *) scrollPtr, argv[2], 0);
} else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
&& (length >= 2)) {
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 == 'd') && (strncmp(argv[1], "delta", length) == 0)) {
int xDelta, yDelta, pixels, length;
double fraction;
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " delta xDelta yDelta\"", (char *) NULL);
goto error;
}
if ((Tcl_GetInt(interp, argv[2], &xDelta) != TCL_OK)
|| (Tcl_GetInt(interp, argv[3], &yDelta) != TCL_OK)) {
goto error;
}
if (scrollPtr->vertical) {
pixels = yDelta;
length = Tk_Height(scrollPtr->tkwin) - 1
- 2*(ARROW_LENGTH + scrollPtr->borderWidth);
} else {
pixels = xDelta;
length = Tk_Width(scrollPtr->tkwin) - 1
- 2*(ARROW_LENGTH + scrollPtr->borderWidth);
}
if (length == 0) {
fraction = 0.0;
} else {
fraction = ((double) pixels / (double) length);
}
{
char buffer[30];
sprintf(buffer, "%g", fraction);
Tcl_SetResult(interp,buffer,TCL_VOLATILE);
}
} else if ((c == 'f') && (strncmp(argv[1], "fraction", length) == 0)) {
int x, y, pos, length;
double fraction;
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " fraction x y\"", (char *) NULL);
goto error;
}
if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
|| (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
goto error;
}
if (scrollPtr->vertical) {
pos = y - (ARROW_LENGTH + scrollPtr->borderWidth);
length = Tk_Height(scrollPtr->tkwin) - 1
- 2*(ARROW_LENGTH + scrollPtr->borderWidth);
} else {
pos = x - (ARROW_LENGTH + scrollPtr->borderWidth);
length = Tk_Width(scrollPtr->tkwin) - 1
- 2*(ARROW_LENGTH + scrollPtr->borderWidth);
}
if (length == 0) {
fraction = 0.0;
} else {
fraction = ((double) pos / (double) length);
}
if (fraction < 0) {
fraction = 0;
} else if (fraction > 1.0) {
fraction = 1.0;
}
{
char buffer[30];
sprintf(buffer, "%g", fraction);
Tcl_SetResult(interp,buffer,TCL_VOLATILE);
}
} 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;
}
if (scrollPtr->flags & NEW_STYLE_COMMANDS) {
char first[TCL_DOUBLE_SPACE], last[TCL_DOUBLE_SPACE];
Tcl_PrintDouble(interp, scrollPtr->firstFraction, first);
Tcl_PrintDouble(interp, scrollPtr->lastFraction, last);
Tcl_AppendResult(interp, first, " ", last, (char *) NULL);
} else {
char buffer[100];
sprintf(buffer, "%d %d %d %d", scrollPtr->totalUnits,
scrollPtr->windowUnits, scrollPtr->firstUnit,
scrollPtr->lastUnit);
Tcl_SetResult(interp, buffer, TCL_VOLATILE);
}
} else if ((c == 'i') && (strncmp(argv[1], "identify", length) == 0)) {
result = Ctk_Unsupported(interp, "scrollbar identify");
} else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {
int totalUnits, windowUnits, firstUnit, lastUnit;
if (argc == 4) {
double first, last;
if (Tcl_GetDouble(interp, argv[2], &first) != TCL_OK) {
goto error;
}
if (Tcl_GetDouble(interp, argv[3], &last) != TCL_OK) {
goto error;
}
if (first < 0) {
scrollPtr->firstFraction = 0;
} else if (first > 1.0) {
scrollPtr->firstFraction = 1.0;
} else {
scrollPtr->firstFraction = first;
}
if (last < scrollPtr->firstFraction) {
scrollPtr->lastFraction = scrollPtr->firstFraction;
} else if (last > 1.0) {
scrollPtr->lastFraction = 1.0;
} else {
scrollPtr->lastFraction = last;
}
scrollPtr->flags |= NEW_STYLE_COMMANDS;
} else if (argc == 6) {
if (Tcl_GetInt(interp, argv[2], &totalUnits) != TCL_OK) {
goto error;
}
if (totalUnits < 0) {
totalUnits = 0;
}
if (Tcl_GetInt(interp, argv[3], &windowUnits) != TCL_OK) {
goto error;
}
if (windowUnits < 0) {
windowUnits = 0;
}
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) {
lastUnit = firstUnit;
}
} else {
firstUnit = lastUnit = 0;
}
scrollPtr->totalUnits = totalUnits;
scrollPtr->windowUnits = windowUnits;
scrollPtr->firstUnit = firstUnit;
scrollPtr->lastUnit = lastUnit;
if (scrollPtr->totalUnits == 0) {
scrollPtr->firstFraction = 0.0;
scrollPtr->lastFraction = 1.0;
} else {
scrollPtr->firstFraction = ((double) firstUnit)/totalUnits;
scrollPtr->lastFraction = ((double) (lastUnit+1))/totalUnits;
}
scrollPtr->flags &= ~NEW_STYLE_COMMANDS;
} else {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " set firstFraction lastFraction\" or \"",
argv[0],
" set totalUnits windowUnits firstUnit lastUnit\"",
(char *) NULL);
goto error;
}
ComputeScrollbarGeometry(scrollPtr);
EventuallyRedraw(scrollPtr);
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be activate, cget, configure, delta, fraction, ",
"get, identify, 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.
*/
Tk_FreeOptions(configSpecs, (char *) scrollPtr, 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. */
{
size_t length;
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.
*/
if (scrollPtr->width < 1) {
scrollPtr->width = 1;
}
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;
}
/*
* 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.
*/
Tk_SetInternalBorder(scrollPtr->tkwin, scrollPtr->borderWidth);
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;
int bd = scrollPtr->borderWidth;
int xBound = Tk_Width(tkwin) - bd;
int yBound = Tk_Height(tkwin) - bd;
int middle;
if ((scrollPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
goto done;
}
if (scrollPtr->vertical) {
if (Tk_Width(tkwin) > 1 + 2*bd) {
Ctk_FillRect(tkwin, bd, bd, xBound, yBound, CTK_PLAIN_STYLE, ' ');
}
middle = Tk_Width(tkwin)/2;
Ctk_DrawCharacter(tkwin, middle, bd, CTK_PLAIN_STYLE, '^');
Ctk_FillRect(tkwin, middle, bd+1, middle+1, yBound-1,
CTK_PLAIN_STYLE, '|');
Ctk_DrawCharacter(tkwin, middle, yBound-1, CTK_PLAIN_STYLE, 'V');
Ctk_FillRect(scrollPtr->tkwin,
middle, scrollPtr->sliderFirst, middle+1, scrollPtr->sliderLast,
CTK_PLAIN_STYLE, '#');
if (scrollPtr->flags & GOT_FOCUS) {
Ctk_SetCursor(tkwin, middle, scrollPtr->sliderFirst);
}
} else {
if (Tk_Height(tkwin) > 1 + 2*bd) {
Ctk_FillRect(tkwin, bd, bd, xBound, yBound, CTK_PLAIN_STYLE, ' ');
}
middle = Tk_Height(tkwin)/2;
Ctk_DrawCharacter(tkwin, bd, middle, CTK_PLAIN_STYLE, '<');
Ctk_FillRect(tkwin, bd+1, middle, xBound-1, middle+1,
CTK_PLAIN_STYLE, '-');
Ctk_DrawCharacter(tkwin, xBound-1, middle, CTK_PLAIN_STYLE, '>');
Ctk_FillRect(scrollPtr->tkwin,
scrollPtr->sliderFirst, middle, scrollPtr->sliderLast, middle+1,
CTK_PLAIN_STYLE, '#');
if (scrollPtr->flags & GOT_FOCUS) {
Ctk_SetCursor(tkwin, scrollPtr->sliderFirst, middle);
}
}
Ctk_DrawBorder(tkwin, CTK_PLAIN_STYLE, (char *)NULL);
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. */
Ctk_Event *eventPtr; /* Information about event. */
{
Scrollbar *scrollPtr = (Scrollbar *) clientData;
if (eventPtr->type == CTK_EXPOSE_EVENT) {
EventuallyRedraw(scrollPtr);
} else if (eventPtr->type == CTK_DESTROY_EVENT) {
if (scrollPtr->tkwin != NULL) {
scrollPtr->tkwin = NULL;
Tcl_DeleteCommand(scrollPtr->interp,
Tcl_GetCommandName(scrollPtr->interp,
scrollPtr->widgetCmd));
}
if (scrollPtr->flags & REDRAW_PENDING) {
Tcl_CancelIdleCall(DisplayScrollbar, (ClientData) scrollPtr);
}
Tk_EventuallyFree((ClientData) scrollPtr, DestroyScrollbar);
} else if (eventPtr->type == CTK_FOCUS_EVENT) {
scrollPtr->flags |= GOT_FOCUS;
} else if (eventPtr->type == CTK_UNFOCUS_EVENT) {
scrollPtr->flags &= ~GOT_FOCUS;
} else if (eventPtr->type == CTK_MAP_EVENT) {
ComputeScrollbarGeometry(scrollPtr);
}
}
/*
*----------------------------------------------------------------------
*
* ScrollbarCmdDeletedProc --
*
* 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
ScrollbarCmdDeletedProc(clientData)
ClientData clientData; /* Pointer to widget record for widget. */
{
Scrollbar *scrollPtr = (Scrollbar *) clientData;
Tk_Window tkwin = scrollPtr->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) {
scrollPtr->tkwin = NULL;
Tk_DestroyWindow(tkwin);
}
}
/*
*----------------------------------------------------------------------
*
* 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;
width = (scrollPtr->vertical)
? Tk_Width(scrollPtr->tkwin) : Tk_Height(scrollPtr->tkwin);
fieldLength = ( scrollPtr->vertical
? (Tk_Height(scrollPtr->tkwin) - 2*scrollPtr->borderWidth)
: (Tk_Width(scrollPtr->tkwin) - 2*scrollPtr->borderWidth) )
- 2*ARROW_LENGTH;
if (fieldLength < 0) {
fieldLength = 0;
}
scrollPtr->sliderFirst = fieldLength*scrollPtr->firstFraction;
scrollPtr->sliderLast = fieldLength*scrollPtr->lastFraction;
/*
* 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 - 1)) {
scrollPtr->sliderFirst = fieldLength - 1;
}
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;
}
if (scrollPtr->vertical) {
scrollPtr->sliderFirst += ARROW_LENGTH + scrollPtr->borderWidth;
scrollPtr->sliderLast += ARROW_LENGTH + scrollPtr->borderWidth;
} else {
scrollPtr->sliderFirst += ARROW_LENGTH + scrollPtr->borderWidth;
scrollPtr->sliderLast += ARROW_LENGTH + scrollPtr->borderWidth;
}
/*
* 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->borderWidth,
MIN_SLIDER_LENGTH + 2*(ARROW_LENGTH + scrollPtr->borderWidth));
} else {
Tk_GeometryRequest(scrollPtr->tkwin,
MIN_SLIDER_LENGTH + 2*(ARROW_LENGTH + scrollPtr->borderWidth),
scrollPtr->width + 2*scrollPtr->borderWidth);
}
}
/*
*--------------------------------------------------------------
*
* 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) {
Tcl_DoWhenIdle(DisplayScrollbar, (ClientData) scrollPtr);
scrollPtr->flags |= REDRAW_PENDING;
}
}