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Micropolis Activity
/*
* tkInterval.c --
*
* This module implements a interval widgets for the Tk toolkit.
* A interval displays a slider that can be adjusted to change a
* value; it also displays numeric labels and a textual label,
* if desired.
*
* Copyright 1990 Regents of the University of California.
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies. The University of California
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
/* Improvements in the version used for Micropolis are copyrighted and
* licensed under these copyright terms.
*
* Micropolis, Unix Version. This game was released for the Unix platform
* in or about 1990 and has been modified for inclusion in the One Laptop
* Per Child program. Copyright (C) 1989 - 2007 Electronic Arts Inc. If
* you need assistance with this program, you may contact:
* http://wiki.laptop.org/go/Micropolis or email [email protected].
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details. You should have received a
* copy of the GNU General Public License along with this program. If
* not, see <http://www.gnu.org/licenses/>.
*
* ADDITIONAL TERMS per GNU GPL Section 7
*
* No trademark or publicity rights are granted. This license does NOT
* give you any right, title or interest in the trademark SimCity or any
* other Electronic Arts trademark. You may not distribute any
* modification of this program using the trademark SimCity or claim any
* affliation or association with Electronic Arts Inc. or its employees.
*
* Any propagation or conveyance of this program must include this
* copyright notice and these terms.
*
* If you convey this program (or any modifications of it) and assume
* contractual liability for the program to recipients of it, you agree
* to indemnify Electronic Arts for any liability that those contractual
* assumptions impose on Electronic Arts.
*
* You may not misrepresent the origins of this program; modified
* versions of the program must be marked as such and not identified as
* the original program.
*
* This disclaimer supplements the one included in the General Public
* License. TO THE FULLEST EXTENT PERMISSIBLE UNDER APPLICABLE LAW, THIS
* PROGRAM IS PROVIDED TO YOU "AS IS," WITH ALL FAULTS, WITHOUT WARRANTY
* OF ANY KIND, AND YOUR USE IS AT YOUR SOLE RISK. THE ENTIRE RISK OF
* SATISFACTORY QUALITY AND PERFORMANCE RESIDES WITH YOU. ELECTRONIC ARTS
* DISCLAIMS ANY AND ALL EXPRESS, IMPLIED OR STATUTORY WARRANTIES,
* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, SATISFACTORY QUALITY,
* FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT OF THIRD PARTY
* RIGHTS, AND WARRANTIES (IF ANY) ARISING FROM A COURSE OF DEALING,
* USAGE, OR TRADE PRACTICE. ELECTRONIC ARTS DOES NOT WARRANT AGAINST
* INTERFERENCE WITH YOUR ENJOYMENT OF THE PROGRAM; THAT THE PROGRAM WILL
* MEET YOUR REQUIREMENTS; THAT OPERATION OF THE PROGRAM WILL BE
* UNINTERRUPTED OR ERROR-FREE, OR THAT THE PROGRAM WILL BE COMPATIBLE
* WITH THIRD PARTY SOFTWARE OR THAT ANY ERRORS IN THE PROGRAM WILL BE
* CORRECTED. NO ORAL OR WRITTEN ADVICE PROVIDED BY ELECTRONIC ARTS OR
* ANY AUTHORIZED REPRESENTATIVE SHALL CREATE A WARRANTY. SOME
* JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF OR LIMITATIONS ON IMPLIED
* WARRANTIES OR THE LIMITATIONS ON THE APPLICABLE STATUTORY RIGHTS OF A
* CONSUMER, SO SOME OR ALL OF THE ABOVE EXCLUSIONS AND LIMITATIONS MAY
* NOT APPLY TO YOU.
*/
#include "tkconfig.h"
#include "default.h"
#include "tkint.h"
/*
* A data structure of the following type is kept for each interval
* widget managed by this file:
*/
typedef struct {
Tk_Window tkwin; /* Window that embodies the interval. NULL
* means that the window has been destroyed
* but the data structures haven't yet been
* cleaned up.*/
Tcl_Interp *interp; /* Interpreter associated with interval. */
Tk_Uid orientUid; /* Orientation for window ("vertical" or
* "horizontal"). */
int vertical; /* Non-zero means vertical orientation,
* zero means horizontal. */
int minValue; /* Value corresponding to minimum of interval. */
int maxValue; /* Value corresponding to maximum of interval. */
int fromValue; /* Value corresponding to left or top of
* interval. */
int toValue; /* Value corresponding to right or bottom
* of interval. */
int tickInterval; /* Distance between tick marks; 0 means
* don't display any tick marks. */
int trackValue; /* Value of mouse at start of tracking. */
int trackWidth; /* Value of max-min at start of tracking. */
int trackState; /* Tracking state. */
char *command; /* Command prefix to use when invoking Tcl
* commands because the interval value changed.
* NULL means don't invoke commands.
* Malloc'ed. */
int commandLength; /* Number of non-NULL bytes in command. */
char *label; /* Label to display above or to right of
* interval; NULL means don't display a
* label. Malloc'ed. */
int labelLength; /* Number of non-NULL chars. in label. */
Tk_Uid state; /* Normal or disabled. Value cannot be
* changed when interval is disabled. */
/*
* Information used when displaying widget:
*/
int borderWidth; /* Width of 3-D border around window. */
Tk_3DBorder bgBorder; /* Used for drawing background. */
Tk_3DBorder sliderBorder; /* Used for drawing slider in normal mode. */
Tk_3DBorder activeBorder; /* Used for drawing slider when active (i.e.
* when mouse is in window). */
XFontStruct *fontPtr; /* Information about text font, or NULL. */
XColor *textColorPtr; /* Color for drawing text. */
GC textGC; /* GC for drawing text in normal mode. */
int width; /* Desired narrow dimension of interval,
* in pixels. */
int length; /* Desired long dimension of interval,
* in pixels. */
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 showValue; /* Non-zero means to display the interval value
* below or to the left of the slider; zero
* means don't display the value. */
int tickPixels; /* Number of pixels required for widest tick
* mark. 0 means don't display ticks.*/
int valuePixels; /* Number of pixels required for value text. */
int labelPixels; /* Number of pixels required for label. 0
* means don't display label. */
/*
* Miscellaneous information:
*/
Cursor cursor; /* Current cursor for window, or None. */
int flags; /* Various flags; see below for
* definitions. */
} Interval;
/*
* Flag bits for intervals:
*
* REDRAW_SLIDER - 1 means slider (and numerical readout) need
* to be redrawn.
* REDRAW_OTHER - 1 means other stuff besides slider and value
* need to be redrawn.
* REDRAW_ALL - 1 means the entire widget needs to be redrawn.
* ACTIVE - 1 means the widget is active (the mouse is
* in its window).
* BUTTON_PRESSED - 1 means a button press is in progress, so
* slider should appear depressed and should be
* draggable.
*/
#define REDRAW_SLIDER 1
#define REDRAW_OTHER 2
#define REDRAW_ALL 3
#define ACTIVE 4
#define BUTTON_PRESSED 8
/*
* Space to leave between interval area and text.
*/
#define SPACING 2
/*
* Information used for argv parsing.
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_BORDER, "-activeforeground", "activeForeground", "Background",
DEF_SCALE_ACTIVE_FG_COLOR, Tk_Offset(Interval, activeBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-activeforeground", "activeForeground", "Background",
DEF_SCALE_ACTIVE_FG_MONO, Tk_Offset(Interval, activeBorder),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_SCALE_BG_COLOR, Tk_Offset(Interval, bgBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_SCALE_BG_MONO, Tk_Offset(Interval, 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_SCALE_BORDER_WIDTH, Tk_Offset(Interval, borderWidth), 0},
{TK_CONFIG_STRING, "-command", "command", "Command",
(char *) NULL, Tk_Offset(Interval, command), 0},
{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
DEF_SCALE_CURSOR, Tk_Offset(Interval, cursor), TK_CONFIG_NULL_OK},
{TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_FONT, "-font", "font", "Font",
DEF_SCALE_FONT, Tk_Offset(Interval, fontPtr),
0},
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_SCALE_FG_COLOR, Tk_Offset(Interval, textColorPtr),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_SCALE_FG_MONO, Tk_Offset(Interval, textColorPtr),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_INT, "-from", "from", "From",
DEF_SCALE_FROM, Tk_Offset(Interval, fromValue), 0},
{TK_CONFIG_STRING, "-label", "label", "Label",
DEF_SCALE_LABEL, Tk_Offset(Interval, label), 0},
{TK_CONFIG_PIXELS, "-length", "length", "Length",
DEF_SCALE_LENGTH, Tk_Offset(Interval, length), 0},
{TK_CONFIG_UID, "-orient", "orient", "Orient",
DEF_SCALE_ORIENT, Tk_Offset(Interval, orientUid), 0},
{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
DEF_SCALE_RELIEF, Tk_Offset(Interval, relief), 0},
{TK_CONFIG_BOOLEAN, "-showvalue", "showValue", "ShowValue",
DEF_SCALE_SHOW_VALUE, Tk_Offset(Interval, showValue), 0},
{TK_CONFIG_BORDER, "-sliderforeground", "sliderForeground", "Background",
DEF_SCALE_SLIDER_FG_COLOR, Tk_Offset(Interval, sliderBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-sliderforeground", "sliderForeground", "Background",
DEF_SCALE_SLIDER_FG_MONO, Tk_Offset(Interval, sliderBorder),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_PIXELS, "-min", "min", "Min",
"0", Tk_Offset(Interval, minValue), 0},
{TK_CONFIG_PIXELS, "-max", "max", "Max",
"9999", Tk_Offset(Interval, maxValue), 0},
{TK_CONFIG_UID, "-state", "state", "State",
DEF_SCALE_STATE, Tk_Offset(Interval, state), 0},
{TK_CONFIG_INT, "-tickinterval", "tickInterval", "TickInterval",
DEF_SCALE_TICK_INTERVAL, Tk_Offset(Interval, tickInterval), 0},
{TK_CONFIG_INT, "-to", "to", "To",
DEF_SCALE_TO, Tk_Offset(Interval, toValue), 0},
{TK_CONFIG_PIXELS, "-width", "width", "Width",
DEF_SCALE_WIDTH, Tk_Offset(Interval, 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 ComputeIntervalGeometry _ANSI_ARGS_((Interval *intervalPtr));
static int ConfigureInterval _ANSI_ARGS_((Tcl_Interp *interp,
Interval *intervalPtr, int argc, char **argv,
int flags));
static void DestroyInterval _ANSI_ARGS_((ClientData clientData));
static void DisplayHorizontalInterval _ANSI_ARGS_((
ClientData clientData));
static void DisplayHorizontalValue _ANSI_ARGS_((Interval *intervalPtr,
int value, int bottom));
static void DisplayVerticalInterval _ANSI_ARGS_((
ClientData clientData));
static void DisplayVerticalValue _ANSI_ARGS_((Interval *intervalPtr,
int value, int rightEdge));
static void EventuallyRedrawInterval _ANSI_ARGS_((Interval *intervalPtr,
int what));
static int PixelToValue _ANSI_ARGS_((Interval *intervalPtr, int x,
int y));
static void IntervalEventProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static void IntervalMouseProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static int IntervalWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
static void SetInterval _ANSI_ARGS_((Interval *intervalPtr,
int minValue, int maxValue, int notify));
static void TrackInterval _ANSI_ARGS_((Interval *intervalPtr,
int value));
static void StartTrackInterval _ANSI_ARGS_((Interval *intervalPtr,
int value));
static int ValueToPixel _ANSI_ARGS_((Interval *intervalPtr, int value));
/*
*--------------------------------------------------------------
*
* Tk_IntervalCmd --
*
* This procedure is invoked to process the "interval" 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_IntervalCmd(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 Interval *intervalPtr;
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 ConfigureInterval,
* or which ConfigureInterval expects to have reasonable values
* (e.g. resource pointers).
*/
intervalPtr = (Interval *) ckalloc(sizeof(Interval));
intervalPtr->tkwin = new;
intervalPtr->interp = interp;
intervalPtr->minValue = 0;
intervalPtr->maxValue = 0;
intervalPtr->command = NULL;
intervalPtr->label = NULL;
intervalPtr->state = tkNormalUid;
intervalPtr->bgBorder = NULL;
intervalPtr->sliderBorder = NULL;
intervalPtr->activeBorder = NULL;
intervalPtr->fontPtr = NULL;
intervalPtr->textColorPtr = NULL;
intervalPtr->textGC = None;
intervalPtr->cursor = None;
intervalPtr->flags = 0;
Tk_SetClass(intervalPtr->tkwin, "Interval");
Tk_CreateEventHandler(intervalPtr->tkwin, ExposureMask|StructureNotifyMask,
IntervalEventProc, (ClientData) intervalPtr);
Tk_CreateEventHandler(intervalPtr->tkwin, EnterWindowMask|LeaveWindowMask
|PointerMotionMask|ButtonPressMask|ButtonReleaseMask,
IntervalMouseProc, (ClientData) intervalPtr);
Tcl_CreateCommand(interp, Tk_PathName(intervalPtr->tkwin), IntervalWidgetCmd,
(ClientData) intervalPtr, (void (*)()) NULL);
if (ConfigureInterval(interp, intervalPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
interp->result = Tk_PathName(intervalPtr->tkwin);
return TCL_OK;
error:
Tk_DestroyWindow(intervalPtr->tkwin);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* IntervalWidgetCmd --
*
* 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
IntervalWidgetCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about interval
* widget. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Interval *intervalPtr = (Interval *) 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) intervalPtr);
c = argv[1][0];
length = strlen(argv[1]);
if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)) {
if (argc == 2) {
result = Tk_ConfigureInfo(interp, intervalPtr->tkwin, configSpecs,
(char *) intervalPtr, (char *) NULL, 0);
} else if (argc == 3) {
result = Tk_ConfigureInfo(interp, intervalPtr->tkwin, configSpecs,
(char *) intervalPtr, argv[2], 0);
} else {
result = ConfigureInterval(interp, intervalPtr, 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", intervalPtr->minValue, intervalPtr->maxValue);
} else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {
int minValue, maxValue;
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " set minValue maxValue\"", (char *) NULL);
goto error;
}
if (Tcl_GetInt(interp, argv[2], &minValue) != TCL_OK) {
goto error;
}
if (Tcl_GetInt(interp, argv[3], &maxValue) != TCL_OK) {
goto error;
}
if (minValue > maxValue) {
int temp = minValue;
minValue = maxValue; maxValue = temp;
}
if (intervalPtr->state == tkNormalUid) {
if ((minValue < intervalPtr->fromValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
minValue = intervalPtr->fromValue;
}
if ((minValue > intervalPtr->toValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
minValue = intervalPtr->toValue;
}
if ((maxValue < intervalPtr->fromValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
maxValue = intervalPtr->fromValue;
}
if ((maxValue > intervalPtr->toValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
maxValue = intervalPtr->toValue;
}
SetInterval(intervalPtr, minValue, maxValue, 1);
}
} else if ((c == 'r') && (strncmp(argv[1], "reset", length) == 0)) {
if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " reset\"", (char *) NULL);
goto error;
}
SetInterval(intervalPtr,
intervalPtr->fromValue, intervalPtr->toValue, 0);
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be configure, get, or set", (char *) NULL);
goto error;
}
Tk_Release((ClientData) intervalPtr);
return result;
error:
Tk_Release((ClientData) intervalPtr);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DestroyInterval --
*
* This procedure is invoked by Tk_EventuallyFree or Tk_Release
* to clean up the internal structure of a button at a safe time
* (when no-one is using it anymore).
*
* Results:
* None.
*
* Side effects:
* Everything associated with the interval is freed up.
*
*----------------------------------------------------------------------
*/
static void
DestroyInterval(clientData)
ClientData clientData; /* Info about interval widget. */
{
register Interval *intervalPtr = (Interval *) clientData;
if (intervalPtr->command != NULL) {
ckfree(intervalPtr->command);
}
if (intervalPtr->label != NULL) {
ckfree(intervalPtr->label);
}
if (intervalPtr->bgBorder != NULL) {
Tk_Free3DBorder(intervalPtr->bgBorder);
}
if (intervalPtr->sliderBorder != NULL) {
Tk_Free3DBorder(intervalPtr->sliderBorder);
}
if (intervalPtr->activeBorder != NULL) {
Tk_Free3DBorder(intervalPtr->activeBorder);
}
if (intervalPtr->fontPtr != NULL) {
Tk_FreeFontStruct(intervalPtr->fontPtr);
}
if (intervalPtr->textColorPtr != NULL) {
Tk_FreeColor(intervalPtr->textColorPtr);
}
if (intervalPtr->textGC != None) {
Tk_FreeGC(intervalPtr->textGC);
}
if (intervalPtr->cursor != None) {
Tk_FreeCursor(intervalPtr->cursor);
}
ckfree((char *) intervalPtr);
}
/*
*----------------------------------------------------------------------
*
* ConfigureInterval --
*
* This procedure is called to process an argv/argc list, plus
* the Tk option database, in order to configure (or
* reconfigure) a interval 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 intervalPtr; old resources get freed,
* if there were any.
*
*----------------------------------------------------------------------
*/
static int
ConfigureInterval(interp, intervalPtr, argc, argv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
register Interval *intervalPtr; /* 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. */
{
XGCValues gcValues;
GC newGC;
int length;
if (Tk_ConfigureWidget(interp, intervalPtr->tkwin, configSpecs,
argc, argv, (char *) intervalPtr, 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(intervalPtr->orientUid);
if (strncmp(intervalPtr->orientUid, "vertical", length) == 0) {
intervalPtr->vertical = 1;
} else if (strncmp(intervalPtr->orientUid, "horizontal", length) == 0) {
intervalPtr->vertical = 0;
} else {
Tcl_AppendResult(interp, "bad orientation \"", intervalPtr->orientUid,
"\": must be vertical or horizontal", (char *) NULL);
return TCL_ERROR;
}
if ((intervalPtr->state != tkNormalUid)
&& (intervalPtr->state != tkDisabledUid)) {
Tcl_AppendResult(interp, "bad state value \"", intervalPtr->state,
"\": must be normal or disabled", (char *) NULL);
intervalPtr->state = tkNormalUid;
return TCL_ERROR;
}
/*
* Make sure that the tick interval has the right sign so that
* addition moves from fromValue to toValue.
*/
if ((intervalPtr->tickInterval < 0)
^ ((intervalPtr->toValue - intervalPtr->fromValue) < 0)) {
intervalPtr->tickInterval = -intervalPtr->tickInterval;
}
/*
* Set the interval mix and max values to themselves; all this does is
* to make sure that the interval's value is within the new acceptable
* range for the interval.
*/
SetInterval(intervalPtr, intervalPtr->minValue, intervalPtr->maxValue, 0);
if (intervalPtr->command != NULL) {
intervalPtr->commandLength = strlen(intervalPtr->command);
} else {
intervalPtr->commandLength = 0;
}
if (intervalPtr->label != NULL) {
intervalPtr->labelLength = strlen(intervalPtr->label);
} else {
intervalPtr->labelLength = 0;
}
Tk_SetBackgroundFromBorder(intervalPtr->tkwin, intervalPtr->bgBorder);
gcValues.font = intervalPtr->fontPtr->fid;
gcValues.foreground = intervalPtr->textColorPtr->pixel;
newGC = Tk_GetGC(intervalPtr->tkwin, GCForeground|GCFont, &gcValues);
if (intervalPtr->textGC != None) {
Tk_FreeGC(intervalPtr->textGC);
}
intervalPtr->textGC = newGC;
if (intervalPtr->relief != TK_RELIEF_FLAT) {
intervalPtr->offset = intervalPtr->borderWidth;
} else {
intervalPtr->offset = 0;
}
/*
* Recompute display-related information, and let the geometry
* manager know how much space is needed now.
*/
ComputeIntervalGeometry(intervalPtr);
EventuallyRedrawInterval(intervalPtr, REDRAW_ALL);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ComputeIntervalGeometry --
*
* This procedure is called to compute various geometrical
* information for a interval, such as where various things get
* displayed. It's called when the window is reconfigured.
*
* Results:
* None.
*
* Side effects:
* Display-related numbers get changed in *scrollPtr. The
* geometry manager gets told about the window's preferred size.
*
*----------------------------------------------------------------------
*/
static void
ComputeIntervalGeometry(intervalPtr)
register Interval *intervalPtr; /* Information about widget. */
{
XCharStruct bbox;
char valueString[30];
int dummy, lineHeight;
/*
* Horizontal intervals are simpler than vertical ones because
* all sizes are the same (the height of a line of text);
* handle them first and then quit.
*/
if (!intervalPtr->vertical) {
lineHeight = intervalPtr->fontPtr->ascent + intervalPtr->fontPtr->descent;
if (intervalPtr->tickInterval != 0) {
intervalPtr->tickPixels = lineHeight;
} else {
intervalPtr->tickPixels = 0;
}
if (intervalPtr->showValue) {
intervalPtr->valuePixels = lineHeight + SPACING;
} else {
intervalPtr->valuePixels = 0;
}
if (intervalPtr->labelLength != 0) {
intervalPtr->labelPixels = lineHeight;
} else {
intervalPtr->labelPixels = 0;
}
Tk_GeometryRequest(intervalPtr->tkwin,
intervalPtr->length + 2*intervalPtr->offset,
intervalPtr->tickPixels + intervalPtr->valuePixels
+ intervalPtr->width + 2*intervalPtr->borderWidth
+ intervalPtr->labelPixels + 2*intervalPtr->offset);
Tk_SetInternalBorder(intervalPtr->tkwin, intervalPtr->borderWidth);
return;
}
/*
* Vertical interval: compute the amount of space needed for tick marks
* and current value by formatting strings for the two end points;
* use whichever length is longer.
*/
sprintf(valueString, "%d", intervalPtr->fromValue);
XTextExtents(intervalPtr->fontPtr, valueString, strlen(valueString),
&dummy, &dummy, &dummy, &bbox);
intervalPtr->tickPixels = bbox.rbearing + bbox.lbearing;
sprintf(valueString, "%d", intervalPtr->toValue);
XTextExtents(intervalPtr->fontPtr, valueString, strlen(valueString),
&dummy, &dummy, &dummy, &bbox);
if (intervalPtr->tickPixels < bbox.rbearing + bbox.lbearing) {
intervalPtr->tickPixels = bbox.rbearing + bbox.lbearing;
}
/*
* Pad the value with a bit of extra space for prettier printing.
*/
intervalPtr->tickPixels += intervalPtr->fontPtr->ascent/2;
intervalPtr->valuePixels = intervalPtr->tickPixels;
if (intervalPtr->tickInterval == 0) {
intervalPtr->tickPixels = 0;
}
if (!intervalPtr->showValue) {
intervalPtr->valuePixels = 0;
}
if (intervalPtr->labelLength == 0) {
intervalPtr->labelPixels = 0;
} else {
XTextExtents(intervalPtr->fontPtr, intervalPtr->label,
intervalPtr->labelLength, &dummy, &dummy, &dummy, &bbox);
intervalPtr->labelPixels = bbox.rbearing + bbox.lbearing
+ intervalPtr->fontPtr->ascent;
}
Tk_GeometryRequest(intervalPtr->tkwin, 2*intervalPtr->borderWidth
+ intervalPtr->tickPixels + intervalPtr->valuePixels + SPACING
+ intervalPtr->width + intervalPtr->labelPixels,
intervalPtr->length);
Tk_SetInternalBorder(intervalPtr->tkwin, intervalPtr->borderWidth);
}
/*
*--------------------------------------------------------------
*
* DisplayVerticalInterval --
*
* This procedure redraws the contents of a vertical interval
* 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
DisplayVerticalInterval(clientData)
ClientData clientData; /* Information about widget. */
{
register Interval *intervalPtr = (Interval *) clientData;
register Tk_Window tkwin = intervalPtr->tkwin;
int tickRightEdge, valueRightEdge, labelLeftEdge, intervalLeftEdge;
int totalPixels, x, y, width, height, tickValue, min, max;
int relief;
Tk_3DBorder sliderBorder;
if ((intervalPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
goto done;
}
/*
* Scanning from left to right across the window, the window
* will contain four columns: ticks, value, interval, and label.
* Compute the x-coordinate for each of the columns.
*/
totalPixels = intervalPtr->tickPixels + intervalPtr->valuePixels
+ 2*intervalPtr->borderWidth + intervalPtr->width
+ 2*SPACING + intervalPtr->labelPixels;
tickRightEdge = (Tk_Width(tkwin) - totalPixels)/2 + intervalPtr->tickPixels;
valueRightEdge = tickRightEdge + intervalPtr->valuePixels;
intervalLeftEdge = valueRightEdge + SPACING;
labelLeftEdge = intervalLeftEdge + 2*intervalPtr->borderWidth
+ intervalPtr->width + intervalPtr->fontPtr->ascent/2;
/*
* Display the information from left to right across the window.
*/
if (intervalPtr->flags & REDRAW_OTHER) {
XClearWindow(Tk_Display(tkwin), Tk_WindowId(tkwin));
/*
* Display the tick marks.
*/
if (intervalPtr->tickPixels != 0) {
for (tickValue = intervalPtr->fromValue; ;
tickValue += intervalPtr->tickInterval) {
if (intervalPtr->toValue > intervalPtr->fromValue) {
if (tickValue > intervalPtr->toValue) {
break;
}
} else {
if (tickValue < intervalPtr->toValue) {
break;
}
}
DisplayVerticalValue(intervalPtr, tickValue, tickRightEdge);
}
}
}
/*
* Display the values, if they are desired. If not redisplaying the
* entire window, clear the area of the value to get rid of the
* old value displayed there.
*/
if (intervalPtr->showValue) {
if (!(intervalPtr->flags & REDRAW_OTHER)) {
XClearArea(Tk_Display(tkwin), Tk_WindowId(tkwin),
valueRightEdge-intervalPtr->valuePixels, intervalPtr->offset,
intervalPtr->valuePixels,
Tk_Height(tkwin) - 2*intervalPtr->offset, False);
}
DisplayVerticalValue(intervalPtr, intervalPtr->minValue, valueRightEdge);
DisplayVerticalValue(intervalPtr, intervalPtr->maxValue, valueRightEdge);
}
/*
* Display the interval and the slider. If not redisplaying the
* entire window, must clear the trench area to erase the old
* slider, but don't need to redraw the border.
*/
if (intervalPtr->flags & REDRAW_OTHER) {
Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalPtr->bgBorder, intervalLeftEdge, intervalPtr->offset,
intervalPtr->width + 2*intervalPtr->borderWidth,
Tk_Height(tkwin) - 2*intervalPtr->offset, intervalPtr->borderWidth,
TK_RELIEF_SUNKEN);
} else {
XClearArea(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalLeftEdge + intervalPtr->borderWidth,
intervalPtr->offset + intervalPtr->borderWidth,
intervalPtr->width,
Tk_Height(tkwin) - 2*intervalPtr->offset
- 2*intervalPtr->borderWidth, False);
}
if (intervalPtr->flags & ACTIVE) {
sliderBorder = intervalPtr->activeBorder;
} else {
sliderBorder = intervalPtr->sliderBorder;
}
width = intervalPtr->width;
min = ValueToPixel(intervalPtr, intervalPtr->minValue);
max = ValueToPixel(intervalPtr, intervalPtr->maxValue);
height = (max - min) + (2 * intervalPtr->borderWidth);
x = intervalLeftEdge + intervalPtr->borderWidth;
relief = (intervalPtr->flags & BUTTON_PRESSED) ? TK_RELIEF_SUNKEN
: TK_RELIEF_RAISED;
Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin), sliderBorder,
x, min, width, height, intervalPtr->borderWidth, relief);
/*
* Draw the label to the right of the interval.
*/
if ((intervalPtr->flags & REDRAW_OTHER) && (intervalPtr->labelPixels != 0)) {
XDrawString(Tk_Display(intervalPtr->tkwin), Tk_WindowId(intervalPtr->tkwin),
intervalPtr->textGC, labelLeftEdge,
intervalPtr->offset + (3*intervalPtr->fontPtr->ascent)/2,
intervalPtr->label, intervalPtr->labelLength);
}
/*
* Draw the window border.
*/
if ((intervalPtr->flags & REDRAW_OTHER)
&& (intervalPtr->relief != TK_RELIEF_FLAT)) {
Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalPtr->bgBorder, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin),
intervalPtr->borderWidth, intervalPtr->relief);
}
done:
intervalPtr->flags &= ~REDRAW_ALL;
}
/*
*----------------------------------------------------------------------
*
* DisplayVerticalValue --
*
* This procedure is called to display values (interval readings)
* for vertically-oriented intervals.
*
* Results:
* None.
*
* Side effects:
* The numerical value corresponding to value is displayed with
* its right edge at "rightEdge", and at a vertical position in
* the interval that corresponds to "value".
*
*----------------------------------------------------------------------
*/
static void
DisplayVerticalValue(intervalPtr, value, rightEdge)
register Interval *intervalPtr; /* Information about widget in which to
* display value. */
int value; /* Y-coordinate of number to display,
* specified in application coords, not
* in pixels (we'll compute pixels). */
int rightEdge; /* X-coordinate of right edge of text,
* specified in pixels. */
{
register Tk_Window tkwin = intervalPtr->tkwin;
int y, dummy, length;
char valueString[30];
XCharStruct bbox;
y = ValueToPixel(intervalPtr, value) + intervalPtr->fontPtr->ascent/2;
sprintf(valueString, "%d", value);
length = strlen(valueString);
XTextExtents(intervalPtr->fontPtr, valueString, length,
&dummy, &dummy, &dummy, &bbox);
/*
* Adjust the y-coordinate if necessary to keep the text entirely
* inside the window.
*/
if ((y - bbox.ascent) < intervalPtr->offset) {
y = intervalPtr->offset + bbox.ascent;
}
if ((y + bbox.descent) > (Tk_Height(tkwin) - intervalPtr->offset)) {
y = Tk_Height(tkwin) - intervalPtr->offset - bbox.descent;
}
XDrawString(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalPtr->textGC, rightEdge - bbox.rbearing,
y, valueString, length);
}
/*
*--------------------------------------------------------------
*
* DisplayHorizontalInterval --
*
* This procedure redraws the contents of a horizontal interval
* 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
DisplayHorizontalInterval(clientData)
ClientData clientData; /* Information about widget. */
{
register Interval *intervalPtr = (Interval *) clientData;
register Tk_Window tkwin = intervalPtr->tkwin;
int tickBottom, valueBottom, labelBottom, intervalBottom;
int totalPixels, x, y, width, height, tickValue, min, max;
int relief;
Tk_3DBorder sliderBorder;
if ((intervalPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
goto done;
}
/*
* Scanning from bottom to top across the window, the window
* will contain four rows: ticks, value, interval, and label.
* Compute the y-coordinate for each of the rows.
*/
totalPixels = intervalPtr->tickPixels + intervalPtr->valuePixels
+ 2*intervalPtr->borderWidth + intervalPtr->width
+ intervalPtr->labelPixels;
tickBottom = (Tk_Height(tkwin) + totalPixels)/2 - 1;
valueBottom = tickBottom - intervalPtr->tickPixels;
intervalBottom = valueBottom - intervalPtr->valuePixels;
labelBottom = intervalBottom - 2*intervalPtr->borderWidth - intervalPtr->width;
/*
* Display the information from bottom to top across the window.
*/
if (intervalPtr->flags & REDRAW_OTHER) {
XClearWindow(Tk_Display(tkwin), Tk_WindowId(tkwin));
/*
* Display the tick marks.
*/
if (intervalPtr->tickPixels != 0) {
for (tickValue = intervalPtr->fromValue; ;
tickValue += intervalPtr->tickInterval) {
if (intervalPtr->toValue > intervalPtr->fromValue) {
if (tickValue > intervalPtr->toValue) {
break;
}
} else {
if (tickValue < intervalPtr->toValue) {
break;
}
}
DisplayHorizontalValue(intervalPtr, tickValue, tickBottom);
}
}
}
/*
* Display the values, if they are desired. If not redisplaying the
* entire window, clear the area of the value to get rid of the
* old value displayed there.
*/
if (intervalPtr->showValue) {
if (!(intervalPtr->flags & REDRAW_OTHER)) {
XClearArea(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalPtr->offset, intervalBottom + 1,
Tk_Width(tkwin) - 2*intervalPtr->offset,
valueBottom - intervalBottom, False);
}
DisplayHorizontalValue(intervalPtr, intervalPtr->minValue, valueBottom);
DisplayHorizontalValue(intervalPtr, intervalPtr->maxValue, valueBottom);
}
/*
* Display the interval and the slider. If not redisplaying the
* entire window, must clear the trench area to erase the old
* slider, but don't need to redraw the border.
*/
y = intervalBottom - 2*intervalPtr->borderWidth - intervalPtr->width + 1;
if (intervalPtr->flags & REDRAW_OTHER) {
Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalPtr->bgBorder, intervalPtr->offset, y,
Tk_Width(tkwin) - 2*intervalPtr->offset,
intervalPtr->width + 2*intervalPtr->borderWidth,
intervalPtr->borderWidth, TK_RELIEF_SUNKEN);
} else {
XClearArea(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalPtr->offset + intervalPtr->borderWidth,
y + intervalPtr->borderWidth,
Tk_Width(tkwin) - 2*intervalPtr->offset - 2*intervalPtr->borderWidth,
intervalPtr->width, False);
}
if (intervalPtr->flags & ACTIVE) {
sliderBorder = intervalPtr->activeBorder;
} else {
sliderBorder = intervalPtr->sliderBorder;
}
height = intervalPtr->width;
min = ValueToPixel(intervalPtr, intervalPtr->minValue);
max = ValueToPixel(intervalPtr, intervalPtr->maxValue);
width = (max - min) + (2 * intervalPtr->borderWidth);
y += intervalPtr->borderWidth;
relief = (intervalPtr->flags & BUTTON_PRESSED) ? TK_RELIEF_SUNKEN
: TK_RELIEF_RAISED;
Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin), sliderBorder,
min, y, width, height, intervalPtr->borderWidth, relief);
/*
* Draw the label to the top of the interval.
*/
if ((intervalPtr->flags & REDRAW_OTHER) && (intervalPtr->labelPixels != 0)) {
XDrawString(Tk_Display(intervalPtr->tkwin), Tk_WindowId(intervalPtr->tkwin),
intervalPtr->textGC, intervalPtr->offset + intervalPtr->fontPtr->ascent/2,
labelBottom - intervalPtr->fontPtr->descent,
intervalPtr->label, intervalPtr->labelLength);
}
/*
* Draw the window border.
*/
if ((intervalPtr->flags & REDRAW_OTHER)
&& (intervalPtr->relief != TK_RELIEF_FLAT)) {
Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalPtr->bgBorder, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin),
intervalPtr->borderWidth, intervalPtr->relief);
}
done:
intervalPtr->flags &= ~REDRAW_ALL;
}
/*
*----------------------------------------------------------------------
*
* DisplayHorizontalValue --
*
* This procedure is called to display values (interval readings)
* for horizontally-oriented intervals.
*
* Results:
* None.
*
* Side effects:
* The numerical value corresponding to value is displayed with
* its bottom edge at "bottom", and at a horizontal position in
* the interval that corresponds to "value".
*
*----------------------------------------------------------------------
*/
static void
DisplayHorizontalValue(intervalPtr, value, bottom)
register Interval *intervalPtr; /* Information about widget in which to
* display value. */
int value; /* Y-coordinate of number to display,
* specified in application coords, not
* in pixels (we'll compute pixels). */
int bottom; /* Y-coordinate of bottom edge of text,
* specified in pixels. */
{
register Tk_Window tkwin = intervalPtr->tkwin;
int x, y, dummy, length;
char valueString[30];
XCharStruct bbox;
x = ValueToPixel(intervalPtr, value);
y = bottom - intervalPtr->fontPtr->descent;
sprintf(valueString, "%d", value);
length = strlen(valueString);
XTextExtents(intervalPtr->fontPtr, valueString, length,
&dummy, &dummy, &dummy, &bbox);
/*
* Adjust the x-coordinate if necessary to keep the text entirely
* inside the window.
*/
x -= (bbox.lbearing + bbox.rbearing)/2;
if ((x - bbox.lbearing) < intervalPtr->offset) {
x = intervalPtr->offset + bbox.lbearing;
}
if ((x + bbox.rbearing) > (Tk_Width(tkwin) - intervalPtr->offset)) {
x = Tk_Width(tkwin) - intervalPtr->offset - bbox.rbearing;
}
XDrawString(Tk_Display(tkwin), Tk_WindowId(tkwin),
intervalPtr->textGC, x, y, valueString, length);
}
/*
*----------------------------------------------------------------------
*
* PixelToValue --
*
* Given a pixel within a interval window, return the interval
* reading corresponding to that pixel.
*
* Results:
* An integer interval reading.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
PixelToValue(intervalPtr, x, y)
register Interval *intervalPtr; /* Information about widget. */
int x, y; /* Coordinates of point within
* window. */
{
int value, pixelRange;
if (intervalPtr->vertical) {
pixelRange = Tk_Height(intervalPtr->tkwin)
- 2*intervalPtr->offset - 4*intervalPtr->borderWidth;
value = y;
} else {
pixelRange = Tk_Width(intervalPtr->tkwin)
- 2*intervalPtr->offset - 4*intervalPtr->borderWidth;
value = x;
}
if (pixelRange <= 0) {
/*
* Not enough room for the slider to actually slide: just return
* a constant.
*/
return (0);
}
value -= intervalPtr->offset + intervalPtr->borderWidth;
#if 0
if (value < 0) {
value = 0;
}
if (value > pixelRange) {
value = pixelRange;
}
#endif
if (intervalPtr->toValue > intervalPtr->fromValue) {
value = intervalPtr->fromValue +
((value * (intervalPtr->toValue - intervalPtr->fromValue))
+ pixelRange/2)/pixelRange;
} else {
value = intervalPtr->toValue +
(((pixelRange - value)
* (intervalPtr->fromValue - intervalPtr->toValue))
+ pixelRange/2)/pixelRange;
}
return value;
}
/*
*----------------------------------------------------------------------
*
* ValueToPixel --
*
* Given a reading of the interval, return the x-coordinate or
* y-coordinate corresponding to that reading, depending on
* whether the interval is vertical or horizontal, respectively.
*
* Results:
* An integer value giving the pixel location corresponding
* to reading. The value is restricted to lie within the
* defined range for the interval.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
ValueToPixel(intervalPtr, value)
register Interval *intervalPtr; /* Information about widget. */
int value; /* Reading of the widget. */
{
int y, pixelRange, valueRange;
valueRange = intervalPtr->toValue - intervalPtr->fromValue;
pixelRange = (intervalPtr->vertical ? Tk_Height(intervalPtr->tkwin)
: Tk_Width(intervalPtr->tkwin))
- 2*intervalPtr->offset - 4*intervalPtr->borderWidth;
y = ((value - intervalPtr->fromValue) * pixelRange
+ valueRange/2) / valueRange;
if (y < 0) {
y = 0;
} else if (y > pixelRange) {
y = pixelRange;
}
y += intervalPtr->offset + intervalPtr->borderWidth;
return y;
}
/*
*--------------------------------------------------------------
*
* IntervalEventProc --
*
* This procedure is invoked by the Tk dispatcher for various
* events on intervals.
*
* Results:
* None.
*
* Side effects:
* When the window gets deleted, internal structures get
* cleaned up. When it gets exposed, it is redisplayed.
*
*--------------------------------------------------------------
*/
static void
IntervalEventProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
XEvent *eventPtr; /* Information about event. */
{
Interval *intervalPtr = (Interval *) clientData;
if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
EventuallyRedrawInterval(intervalPtr, REDRAW_ALL);
} else if (eventPtr->type == DestroyNotify) {
Tcl_DeleteCommand(intervalPtr->interp, Tk_PathName(intervalPtr->tkwin));
intervalPtr->tkwin = NULL;
if (intervalPtr->flags & REDRAW_ALL) {
if (intervalPtr->vertical) {
Tk_CancelIdleCall(DisplayVerticalInterval, (ClientData) intervalPtr);
} else {
Tk_CancelIdleCall(DisplayHorizontalInterval,
(ClientData) intervalPtr);
}
}
Tk_EventuallyFree((ClientData) intervalPtr, DestroyInterval);
} else if (eventPtr->type == ConfigureNotify) {
ComputeIntervalGeometry(intervalPtr);
}
}
/*
*--------------------------------------------------------------
*
* IntervalMouseProc --
*
* 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 interval by
* issuing commands in response to button presses and mouse
* motion.
*
*--------------------------------------------------------------
*/
static void
IntervalMouseProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
register XEvent *eventPtr; /* Information about event. */
{
register Interval *intervalPtr = (Interval *) clientData;
if (intervalPtr->state != tkNormalUid) {
return;
}
Tk_Preserve((ClientData) intervalPtr);
if (eventPtr->type == EnterNotify) {
intervalPtr->flags |= ACTIVE;
EventuallyRedrawInterval(intervalPtr, REDRAW_SLIDER);
} else if (eventPtr->type == LeaveNotify) {
intervalPtr->flags &= ~ACTIVE;
EventuallyRedrawInterval(intervalPtr, REDRAW_SLIDER);
} else if ((eventPtr->type == MotionNotify)
&& (intervalPtr->flags & BUTTON_PRESSED)) {
TrackInterval(intervalPtr, PixelToValue(intervalPtr,
eventPtr->xmotion.x, eventPtr->xmotion.y));
} else if ((eventPtr->type == ButtonPress)
/* && (eventPtr->xbutton.button == Button1) */
&& (eventPtr->xbutton.state == 0)) {
intervalPtr->flags |= BUTTON_PRESSED;
StartTrackInterval(intervalPtr, PixelToValue(intervalPtr,
eventPtr->xbutton.x, eventPtr->xbutton.y));
/* NotifyInterval(intervalPtr); */
EventuallyRedrawInterval(intervalPtr, REDRAW_SLIDER);
} else if ((eventPtr->type == ButtonRelease)
/* && (eventPtr->xbutton.button == Button1) */
&& (intervalPtr->flags & BUTTON_PRESSED)) {
intervalPtr->flags &= ~BUTTON_PRESSED;
TrackInterval(intervalPtr, PixelToValue(intervalPtr,
eventPtr->xmotion.x, eventPtr->xmotion.y));
/* NotifyInterval(intervalPtr); */
EventuallyRedrawInterval(intervalPtr, REDRAW_SLIDER);
}
Tk_Release((ClientData) intervalPtr);
}
/*
*--------------------------------------------------------------
*
* TrackInterval --
*
* This procedure changes the value of a interval and invokes
* a Tcl command to reflect the current position of a interval
*
* Results:
* None.
*
* Side effects:
* A Tcl command is invoked, and an additional error-processing
* command may also be invoked. The interval's slider is redrawn.
*
*--------------------------------------------------------------
*/
static void
StartTrackInterval(intervalPtr, value)
register Interval *intervalPtr; /* Info about widget. */
int value; /* New value for interval. Gets
* adjusted if it's off the interval. */
{
int result;
char string[20];
if ((value < intervalPtr->fromValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
value = intervalPtr->fromValue;
}
if ((value > intervalPtr->toValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
value = intervalPtr->toValue;
}
intervalPtr->trackValue = value;
intervalPtr->trackWidth = intervalPtr->maxValue - intervalPtr->minValue;
if (value <= intervalPtr->minValue) {
intervalPtr->trackState = -1;
} else if (value >= intervalPtr->maxValue) {
intervalPtr->trackState = 1;
} else {
intervalPtr->trackState = 0;
}
SetInterval(intervalPtr, intervalPtr->minValue, intervalPtr->maxValue, 1);
}
static void
TrackInterval(intervalPtr, value)
register Interval *intervalPtr; /* Info about widget. */
int value;
{
int result;
char string[20];
int min, max, delta, lastmin, lastmax;
delta = value - intervalPtr->trackValue;
if (delta == 0) return;
intervalPtr->trackValue = value;
min = intervalPtr->minValue;
max = intervalPtr->maxValue;
switch (intervalPtr->trackState) {
case -1: /* left trench */
min += delta;
if (min > max) max = min;
break;
case 1: /* right trench */
max += delta;
if (min > max) min = max;
break;
case 0: /* center slider */
lastmin = min; lastmax = max;
min += delta; max += delta;
if ((max - min) != intervalPtr->trackWidth) { /* squished */
if (lastmin == intervalPtr->fromValue) {
min = max - intervalPtr->trackWidth;
} else if (lastmax == intervalPtr->toValue) {
max = min + intervalPtr->trackWidth;
}
}
break;
}
SetInterval(intervalPtr, min, max, 1);
}
static void
SetInterval(intervalPtr, min, max, notify)
register Interval *intervalPtr; /* Info about widget. */
int min, max, notify;
{
if (min > max) {
int temp = min;
min = max;
max = temp;
}
if ((min < intervalPtr->fromValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
min = intervalPtr->fromValue;
}
if ((min > intervalPtr->toValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
min = intervalPtr->toValue;
}
if ((max < intervalPtr->fromValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
max = intervalPtr->fromValue;
}
if ((max > intervalPtr->toValue)
^ (intervalPtr->toValue < intervalPtr->fromValue)) {
max = intervalPtr->toValue;
}
if ((min == intervalPtr->minValue) &&
(max == intervalPtr->maxValue)) {
return;
}
intervalPtr->minValue = min;
intervalPtr->maxValue = max;
EventuallyRedrawInterval(intervalPtr, REDRAW_SLIDER);
if (notify)
NotifyInterval(intervalPtr);
}
NotifyInterval(intervalPtr)
register Interval *intervalPtr; /* Info about widget. */
{
int result;
char string[256];
sprintf(string, " %d %d", intervalPtr->minValue, intervalPtr->maxValue);
result = Tcl_VarEval(intervalPtr->interp, intervalPtr->command, string,
(char *) NULL);
if (result != TCL_OK) {
TkBindError(intervalPtr->interp);
}
}
/*
*--------------------------------------------------------------
*
* EventuallyRedrawInterval --
*
* Arrange for part or all of a interval widget to redrawn at
* the next convenient time in the future.
*
* Results:
* None.
*
* Side effects:
* If "what" is REDRAW_SLIDER then just the slider and the
* value readout will be redrawn; if "what" is REDRAW_ALL
* then the entire widget will be redrawn.
*
*--------------------------------------------------------------
*/
static void
EventuallyRedrawInterval(intervalPtr, what)
register Interval *intervalPtr; /* Information about widget. */
int what; /* What to redraw: REDRAW_SLIDER
* or REDRAW_ALL. */
{
if ((what == 0) || (intervalPtr->tkwin == NULL)
|| !Tk_IsMapped(intervalPtr->tkwin)) {
return;
}
if ((intervalPtr->flags & REDRAW_ALL) == 0) {
if (intervalPtr->vertical) {
Tk_DoWhenIdle(DisplayVerticalInterval, (ClientData) intervalPtr);
} else {
Tk_DoWhenIdle(DisplayHorizontalInterval, (ClientData) intervalPtr);
}
}
intervalPtr->flags |= what;
}
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