geos_one/archie
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
main
archie/tk4.2/generic/tkScale.c

2055 lines
63 KiB
C
Raw Permalink Normal View History

Update tcl/tk for tcl-dp
2024-05-27 16:40:40 +02:00
/*
* tkScale.c --
*
* This module implements a scale widgets for the Tk toolkit.
* A scale displays a slider that can be adjusted to change a
* value; it also displays numeric labels and a textual label,
* if desired.
*
* The modifications to use floating-point values are based on
* an implementation by Paul Mackerras. The -variable option
* is due to Henning Schulzrinne. All of these are used with
* permission.
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkScale.c 1.80 96/03/21 13:11:55
*/
#include "tkPort.h"
#include "default.h"
#include "tkInt.h"
#include <math.h>
/*
* A data structure of the following type is kept for each scale
* widget managed by this file:
*/
typedef struct {
Tk_Window tkwin; /* Window that embodies the scale. 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 scale. */
Tcl_Command widgetCmd; /* Token for scale's widget command. */
Tk_Uid orientUid; /* Orientation for window ("vertical" or
* "horizontal"). */
int vertical; /* Non-zero means vertical orientation,
* zero means horizontal. */
int width; /* Desired narrow dimension of scale,
* in pixels. */
int length; /* Desired long dimension of scale,
* in pixels. */
double value; /* Current value of scale. */
char *varName; /* Name of variable (malloc'ed) or NULL.
* If non-NULL, scale's value tracks
* the contents of this variable and
* vice versa. */
double fromValue; /* Value corresponding to left or top of
* scale. */
double toValue; /* Value corresponding to right or bottom
* of scale. */
double tickInterval; /* Distance between tick marks; 0 means
* don't display any tick marks. */
double resolution; /* If > 0, all values are rounded to an
* even multiple of this value. */
int digits; /* Number of significant digits to print
* in values. 0 means we get to choose the
* number based on resolution and/or the
* range of the scale. */
char format[10]; /* Sprintf conversion specifier computed from
* digits and other information. */
double bigIncrement; /* Amount to use for large increments to
* scale value. (0 means we pick a value). */
char *command; /* Command prefix to use when invoking Tcl
* commands because the scale value changed.
* NULL means don't invoke commands.
* Malloc'ed. */
int repeatDelay; /* How long to wait before auto-repeating
* on scrolling actions (in ms). */
int repeatInterval; /* Interval between autorepeats (in ms). */
char *label; /* Label to display above or to right of
* scale; 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 scale is disabled. */
/*
* Information used when displaying widget:
*/
int borderWidth; /* Width of 3-D border around window. */
Tk_3DBorder bgBorder; /* Used for drawing slider and other
* background areas. */
Tk_3DBorder activeBorder; /* For drawing the slider when active. */
int sliderRelief; /* Is slider to be drawn raised, sunken, etc. */
XColor *troughColorPtr; /* Color for drawing trough. */
GC troughGC; /* For drawing trough. */
GC copyGC; /* Used for copying from pixmap onto screen. */
XFontStruct *fontPtr; /* Information about text font, or NULL. */
XColor *textColorPtr; /* Color for drawing text. */
GC textGC; /* GC for drawing text in normal mode. */
int relief; /* Indicates whether window as a whole is
* raised, sunken, or flat. */
int highlightWidth; /* Width in pixels of highlight to draw
* around widget when it has the focus.
* <= 0 means don't draw a highlight. */
XColor *highlightBgColorPtr;
/* Color for drawing traversal highlight
* area when highlight is off. */
XColor *highlightColorPtr; /* Color for drawing traversal highlight. */
int inset; /* Total width of all borders, including
* traversal highlight and 3-D border.
* Indicates how much interior stuff must
* be offset from outside edges to leave
* room for borders. */
int sliderLength; /* Length of slider, measured in pixels along
* long dimension of scale. */
int showValue; /* Non-zero means to display the scale value
* below or to the left of the slider; zero
* means don't display the value. */
/*
* Layout information for horizontal scales, assuming that window
* gets the size it requested:
*/
int horizLabelY; /* Y-coord at which to draw label. */
int horizValueY; /* Y-coord at which to draw value text. */
int horizTroughY; /* Y-coord of top of slider trough. */
int horizTickY; /* Y-coord at which to draw tick text. */
/*
* Layout information for vertical scales, assuming that window
* gets the size it requested:
*/
int vertTickRightX; /* X-location of right side of tick-marks. */
int vertValueRightX; /* X-location of right side of value string. */
int vertTroughX; /* X-location of scale's slider trough. */
int vertLabelX; /* X-location of origin of label. */
/*
* Miscellaneous information:
*/
Tk_Cursor cursor; /* Current cursor for window, or None. */
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. */
} Scale;
/*
* Flag bits for scales:
*
* 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).
* INVOKE_COMMAND - 1 means the scale's command needs to be
* invoked during the next redisplay (the
* value of the scale has changed since the
* last time the command was invoked).
* SETTING_VAR - 1 means that the associated variable is
* being set by us, so there's no need for
* ScaleVarProc to do anything.
* NEVER_SET - 1 means that the scale's value has never
* been set before (so must invoke -command and
* set associated variable even if the value
* doesn't appear to have changed).
* GOT_FOCUS - 1 means that the focus is currently in
* this widget.
*/
#define REDRAW_SLIDER 1
#define REDRAW_OTHER 2
#define REDRAW_ALL 3
#define ACTIVE 4
#define INVOKE_COMMAND 0x10
#define SETTING_VAR 0x20
#define NEVER_SET 0x40
#define GOT_FOCUS 0x80
/*
* Symbolic values for the active parts of a slider. These are
* the values that may be returned by the ScaleElement procedure.
*/
#define OTHER 0
#define TROUGH1 1
#define SLIDER 2
#define TROUGH2 3
/*
* Space to leave between scale area and text, and between text and
* edge of window.
*/
#define SPACING 2
/*
* How many characters of space to provide when formatting the
* scale's value:
*/
#define PRINT_CHARS 150
/*
* Information used for argv parsing.
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
DEF_SCALE_ACTIVE_BG_COLOR, Tk_Offset(Scale, activeBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
DEF_SCALE_ACTIVE_BG_MONO, Tk_Offset(Scale, activeBorder),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_SCALE_BG_COLOR, Tk_Offset(Scale, bgBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_SCALE_BG_MONO, Tk_Offset(Scale, bgBorder),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_DOUBLE, "-bigincrement", "bigIncrement", "BigIncrement",
DEF_SCALE_BIG_INCREMENT, Tk_Offset(Scale, bigIncrement), 0},
{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(Scale, borderWidth), 0},
{TK_CONFIG_STRING, "-command", "command", "Command",
DEF_SCALE_COMMAND, Tk_Offset(Scale, command), TK_CONFIG_NULL_OK},
{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
DEF_SCALE_CURSOR, Tk_Offset(Scale, cursor), TK_CONFIG_NULL_OK},
{TK_CONFIG_INT, "-digits", "digits", "Digits",
DEF_SCALE_DIGITS, Tk_Offset(Scale, digits), 0},
{TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_FONT, "-font", "font", "Font",
DEF_SCALE_FONT, Tk_Offset(Scale, fontPtr),
0},
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_SCALE_FG_COLOR, Tk_Offset(Scale, textColorPtr),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_SCALE_FG_MONO, Tk_Offset(Scale, textColorPtr),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_DOUBLE, "-from", "from", "From",
DEF_SCALE_FROM, Tk_Offset(Scale, fromValue), 0},
{TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
"HighlightBackground", DEF_SCALE_HIGHLIGHT_BG,
Tk_Offset(Scale, highlightBgColorPtr), 0},
{TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
DEF_SCALE_HIGHLIGHT, Tk_Offset(Scale, highlightColorPtr), 0},
{TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
"HighlightThickness",
DEF_SCALE_HIGHLIGHT_WIDTH, Tk_Offset(Scale, highlightWidth), 0},
{TK_CONFIG_STRING, "-label", "label", "Label",
DEF_SCALE_LABEL, Tk_Offset(Scale, label), TK_CONFIG_NULL_OK},
{TK_CONFIG_PIXELS, "-length", "length", "Length",
DEF_SCALE_LENGTH, Tk_Offset(Scale, length), 0},
{TK_CONFIG_UID, "-orient", "orient", "Orient",
DEF_SCALE_ORIENT, Tk_Offset(Scale, orientUid), 0},
{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
DEF_SCALE_RELIEF, Tk_Offset(Scale, relief), 0},
{TK_CONFIG_INT, "-repeatdelay", "repeatDelay", "RepeatDelay",
DEF_SCALE_REPEAT_DELAY, Tk_Offset(Scale, repeatDelay), 0},
{TK_CONFIG_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",
DEF_SCALE_REPEAT_INTERVAL, Tk_Offset(Scale, repeatInterval), 0},
{TK_CONFIG_DOUBLE, "-resolution", "resolution", "Resolution",
DEF_SCALE_RESOLUTION, Tk_Offset(Scale, resolution), 0},
{TK_CONFIG_BOOLEAN, "-showvalue", "showValue", "ShowValue",
DEF_SCALE_SHOW_VALUE, Tk_Offset(Scale, showValue), 0},
{TK_CONFIG_PIXELS, "-sliderlength", "sliderLength", "SliderLength",
DEF_SCALE_SLIDER_LENGTH, Tk_Offset(Scale, sliderLength), 0},
{TK_CONFIG_RELIEF, "-sliderrelief", "sliderRelief", "SliderRelief",
DEF_SCALE_SLIDER_RELIEF, Tk_Offset(Scale, sliderRelief),
TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_UID, "-state", "state", "State",
DEF_SCALE_STATE, Tk_Offset(Scale, state), 0},
{TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
DEF_SCALE_TAKE_FOCUS, Tk_Offset(Scale, takeFocus),
TK_CONFIG_NULL_OK},
{TK_CONFIG_DOUBLE, "-tickinterval", "tickInterval", "TickInterval",
DEF_SCALE_TICK_INTERVAL, Tk_Offset(Scale, tickInterval), 0},
{TK_CONFIG_DOUBLE, "-to", "to", "To",
DEF_SCALE_TO, Tk_Offset(Scale, toValue), 0},
{TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",
DEF_SCALE_TROUGH_COLOR, Tk_Offset(Scale, troughColorPtr),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",
DEF_SCALE_TROUGH_MONO, Tk_Offset(Scale, troughColorPtr),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_STRING, "-variable", "variable", "Variable",
DEF_SCALE_VARIABLE, Tk_Offset(Scale, varName), TK_CONFIG_NULL_OK},
{TK_CONFIG_PIXELS, "-width", "width", "Width",
DEF_SCALE_WIDTH, Tk_Offset(Scale, 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 ComputeFormat _ANSI_ARGS_((Scale *scalePtr));
static void ComputeScaleGeometry _ANSI_ARGS_((Scale *scalePtr));
static int ConfigureScale _ANSI_ARGS_((Tcl_Interp *interp,
Scale *scalePtr, int argc, char **argv,
int flags));
static void DestroyScale _ANSI_ARGS_((char *memPtr));
static void DisplayScale _ANSI_ARGS_((ClientData clientData));
static void DisplayHorizontalScale _ANSI_ARGS_((Scale *scalePtr,
Drawable drawable, XRectangle *drawnAreaPtr));
static void DisplayHorizontalValue _ANSI_ARGS_((Scale *scalePtr,
Drawable drawable, double value, int top));
static void DisplayVerticalScale _ANSI_ARGS_((Scale *scalePtr,
Drawable drawable, XRectangle *drawnAreaPtr));
static void DisplayVerticalValue _ANSI_ARGS_((Scale *scalePtr,
Drawable drawable, double value, int rightEdge));
static void EventuallyRedrawScale _ANSI_ARGS_((Scale *scalePtr,
int what));
static double PixelToValue _ANSI_ARGS_((Scale *scalePtr, int x,
int y));
static double RoundToResolution _ANSI_ARGS_((Scale *scalePtr,
double value));
static void ScaleCmdDeletedProc _ANSI_ARGS_((
ClientData clientData));
static int ScaleElement _ANSI_ARGS_((Scale *scalePtr, int x,
int y));
static void ScaleEventProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static char * ScaleVarProc _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, char *name1, char *name2,
int flags));
static int ScaleWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
static void SetScaleValue _ANSI_ARGS_((Scale *scalePtr,
double value, int setVar, int invokeCommand));
static int ValueToPixel _ANSI_ARGS_((Scale *scalePtr, double value));
/*
*--------------------------------------------------------------
*
* Tk_ScaleCmd --
*
* This procedure is invoked to process the "scale" 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_ScaleCmd(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 Scale *scalePtr;
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 ConfigureScale,
* or which ConfigureScale expects to have reasonable values
* (e.g. resource pointers).
*/
scalePtr = (Scale *) ckalloc(sizeof(Scale));
scalePtr->tkwin = new;
scalePtr->display = Tk_Display(new);
scalePtr->interp = interp;
scalePtr->widgetCmd = Tcl_CreateCommand(interp,
Tk_PathName(scalePtr->tkwin), ScaleWidgetCmd,
(ClientData) scalePtr, ScaleCmdDeletedProc);
scalePtr->orientUid = NULL;
scalePtr->vertical = 0;
scalePtr->width = 0;
scalePtr->length = 0;
scalePtr->value = 0;
scalePtr->varName = NULL;
scalePtr->fromValue = 0;
scalePtr->toValue = 0;
scalePtr->tickInterval = 0;
scalePtr->resolution = 1;
scalePtr->bigIncrement = 0.0;
scalePtr->command = NULL;
scalePtr->repeatDelay = 0;
scalePtr->repeatInterval = 0;
scalePtr->label = NULL;
scalePtr->labelLength = 0;
scalePtr->state = tkNormalUid;
scalePtr->borderWidth = 0;
scalePtr->bgBorder = NULL;
scalePtr->activeBorder = NULL;
scalePtr->sliderRelief = TK_RELIEF_RAISED;
scalePtr->troughColorPtr = NULL;
scalePtr->troughGC = None;
scalePtr->copyGC = None;
scalePtr->fontPtr = NULL;
scalePtr->textColorPtr = NULL;
scalePtr->textGC = None;
scalePtr->relief = TK_RELIEF_FLAT;
scalePtr->highlightWidth = 0;
scalePtr->highlightBgColorPtr = NULL;
scalePtr->highlightColorPtr = NULL;
scalePtr->inset = 0;
scalePtr->sliderLength = 0;
scalePtr->showValue = 0;
scalePtr->horizLabelY = 0;
scalePtr->horizValueY = 0;
scalePtr->horizTroughY = 0;
scalePtr->horizTickY = 0;
scalePtr->vertTickRightX = 0;
scalePtr->vertValueRightX = 0;
scalePtr->vertTroughX = 0;
scalePtr->vertLabelX = 0;
scalePtr->cursor = None;
scalePtr->takeFocus = NULL;
scalePtr->flags = NEVER_SET;
Tk_SetClass(scalePtr->tkwin, "Scale");
Tk_CreateEventHandler(scalePtr->tkwin,
ExposureMask|StructureNotifyMask|FocusChangeMask,
ScaleEventProc, (ClientData) scalePtr);
if (ConfigureScale(interp, scalePtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
interp->result = Tk_PathName(scalePtr->tkwin);
return TCL_OK;
error:
Tk_DestroyWindow(scalePtr->tkwin);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* ScaleWidgetCmd --
*
* 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
ScaleWidgetCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about scale
* widget. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Scale *scalePtr = (Scale *) 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;
}
Tcl_Preserve((ClientData) scalePtr);
c = argv[1][0];
length = strlen(argv[1]);
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, scalePtr->tkwin, configSpecs,
(char *) scalePtr, argv[2], 0);
} else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
&& (length >= 3)) {
if (argc == 2) {
result = Tk_ConfigureInfo(interp, scalePtr->tkwin, configSpecs,
(char *) scalePtr, (char *) NULL, 0);
} else if (argc == 3) {
result = Tk_ConfigureInfo(interp, scalePtr->tkwin, configSpecs,
(char *) scalePtr, argv[2], 0);
} else {
result = ConfigureScale(interp, scalePtr, argc-2, argv+2,
TK_CONFIG_ARGV_ONLY);
}
} else if ((c == 'c') && (strncmp(argv[1], "coords", length) == 0)
&& (length >= 3)) {
int x, y ;
double value;
if ((argc != 2) && (argc != 3)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " coords ?value?\"", (char *) NULL);
goto error;
}
if (argc == 3) {
if (Tcl_GetDouble(interp, argv[2], &value) != TCL_OK) {
goto error;
}
} else {
value = scalePtr->value;
}
if (scalePtr->vertical) {
x = scalePtr->vertTroughX + scalePtr->width/2
+ scalePtr->borderWidth;
y = ValueToPixel(scalePtr, value);
} else {
x = ValueToPixel(scalePtr, value);
y = scalePtr->horizTroughY + scalePtr->width/2
+ scalePtr->borderWidth;
}
sprintf(interp->result, "%d %d", x, y);
} else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
double value;
int x, y;
if ((argc != 2) && (argc != 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " get ?x y?\"", (char *) NULL);
goto error;
}
if (argc == 2) {
value = scalePtr->value;
} else {
if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
|| (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
goto error;
}
value = PixelToValue(scalePtr, x, y);
}
sprintf(interp->result, scalePtr->format, value);
} else if ((c == 'i') && (strncmp(argv[1], "identify", length) == 0)) {
int x, y, thing;
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " identify 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;
}
thing = ScaleElement(scalePtr, x,y);
switch (thing) {
case TROUGH1: interp->result = "trough1"; break;
case SLIDER: interp->result = "slider"; break;
case TROUGH2: interp->result = "trough2"; break;
}
} else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {
double value;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " set value\"", (char *) NULL);
goto error;
}
if (Tcl_GetDouble(interp, argv[2], &value) != TCL_OK) {
goto error;
}
if (scalePtr->state != tkDisabledUid) {
SetScaleValue(scalePtr, value, 1, 1);
}
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be cget, configure, coords, get, identify, or set",
(char *) NULL);
goto error;
}
Tcl_Release((ClientData) scalePtr);
return result;
error:
Tcl_Release((ClientData) scalePtr);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DestroyScale --
*
* This procedure is invoked by Tcl_EventuallyFree or Tcl_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 scale is freed up.
*
*----------------------------------------------------------------------
*/
static void
DestroyScale(memPtr)
char *memPtr; /* Info about scale widget. */
{
register Scale *scalePtr = (Scale *) memPtr;
/*
* Free up all the stuff that requires special handling, then
* let Tk_FreeOptions handle all the standard option-related
* stuff.
*/
if (scalePtr->varName != NULL) {
Tcl_UntraceVar(scalePtr->interp, scalePtr->varName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ScaleVarProc, (ClientData) scalePtr);
}
if (scalePtr->troughGC != None) {
Tk_FreeGC(scalePtr->display, scalePtr->troughGC);
}
if (scalePtr->copyGC != None) {
Tk_FreeGC(scalePtr->display, scalePtr->copyGC);
}
if (scalePtr->textGC != None) {
Tk_FreeGC(scalePtr->display, scalePtr->textGC);
}
Tk_FreeOptions(configSpecs, (char *) scalePtr, scalePtr->display, 0);
ckfree((char *) scalePtr);
}
/*
*----------------------------------------------------------------------
*
* ConfigureScale --
*
* This procedure is called to process an argv/argc list, plus
* the Tk option database, in order to configure (or
* reconfigure) a scale 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 scalePtr; old resources get freed,
* if there were any.
*
*----------------------------------------------------------------------
*/
static int
ConfigureScale(interp, scalePtr, argc, argv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
register Scale *scalePtr; /* 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;
size_t length;
/*
* Eliminate any existing trace on a variable monitored by the scale.
*/
if (scalePtr->varName != NULL) {
Tcl_UntraceVar(interp, scalePtr->varName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ScaleVarProc, (ClientData) scalePtr);
}
if (Tk_ConfigureWidget(interp, scalePtr->tkwin, configSpecs,
argc, argv, (char *) scalePtr, flags) != TCL_OK) {
return TCL_ERROR;
}
/*
* If the scale is tied to the value of a variable, then set up
* a trace on the variable's value and set the scale's value from
* the value of the variable, if it exists.
*/
if (scalePtr->varName != NULL) {
char *stringValue, *end;
double value;
stringValue = Tcl_GetVar(interp, scalePtr->varName, TCL_GLOBAL_ONLY);
if (stringValue != NULL) {
value = strtod(stringValue, &end);
if ((end != stringValue) && (*end == 0)) {
scalePtr->value = RoundToResolution(scalePtr, value);
}
}
Tcl_TraceVar(interp, scalePtr->varName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ScaleVarProc, (ClientData) scalePtr);
}
/*
* Several options need special processing, such as parsing the
* orientation and creating GCs.
*/
length = strlen(scalePtr->orientUid);
if (strncmp(scalePtr->orientUid, "vertical", length) == 0) {
scalePtr->vertical = 1;
} else if (strncmp(scalePtr->orientUid, "horizontal", length) == 0) {
scalePtr->vertical = 0;
} else {
Tcl_AppendResult(interp, "bad orientation \"", scalePtr->orientUid,
"\": must be vertical or horizontal", (char *) NULL);
return TCL_ERROR;
}
scalePtr->fromValue = RoundToResolution(scalePtr, scalePtr->fromValue);
scalePtr->toValue = RoundToResolution(scalePtr, scalePtr->toValue);
scalePtr->tickInterval = RoundToResolution(scalePtr,
scalePtr->tickInterval);
/*
* Make sure that the tick interval has the right sign so that
* addition moves from fromValue to toValue.
*/
if ((scalePtr->tickInterval < 0)
^ ((scalePtr->toValue - scalePtr->fromValue) < 0)) {
scalePtr->tickInterval = -scalePtr->tickInterval;
}
/*
* Set the scale value to itself; all this does is to make sure
* that the scale's value is within the new acceptable range for
* the scale and reflect the value in the associated variable,
* if any.
*/
ComputeFormat(scalePtr);
SetScaleValue(scalePtr, scalePtr->value, 1, 1);
if (scalePtr->label != NULL) {
scalePtr->labelLength = strlen(scalePtr->label);
} else {
scalePtr->labelLength = 0;
}
if ((scalePtr->state != tkNormalUid)
&& (scalePtr->state != tkDisabledUid)
&& (scalePtr->state != tkActiveUid)) {
Tcl_AppendResult(interp, "bad state value \"", scalePtr->state,
"\": must be normal, active, or disabled", (char *) NULL);
scalePtr->state = tkNormalUid;
return TCL_ERROR;
}
Tk_SetBackgroundFromBorder(scalePtr->tkwin, scalePtr->bgBorder);
gcValues.foreground = scalePtr->troughColorPtr->pixel;
newGC = Tk_GetGC(scalePtr->tkwin, GCForeground, &gcValues);
if (scalePtr->troughGC != None) {
Tk_FreeGC(scalePtr->display, scalePtr->troughGC);
}
scalePtr->troughGC = newGC;
if (scalePtr->copyGC == None) {
gcValues.graphics_exposures = False;
scalePtr->copyGC = Tk_GetGC(scalePtr->tkwin, GCGraphicsExposures,
&gcValues);
}
if (scalePtr->highlightWidth < 0) {
scalePtr->highlightWidth = 0;
}
gcValues.font = scalePtr->fontPtr->fid;
gcValues.foreground = scalePtr->textColorPtr->pixel;
newGC = Tk_GetGC(scalePtr->tkwin, GCForeground|GCFont, &gcValues);
if (scalePtr->textGC != None) {
Tk_FreeGC(scalePtr->display, scalePtr->textGC);
}
scalePtr->textGC = newGC;
scalePtr->inset = scalePtr->highlightWidth + scalePtr->borderWidth;
/*
* Recompute display-related information, and let the geometry
* manager know how much space is needed now.
*/
ComputeScaleGeometry(scalePtr);
EventuallyRedrawScale(scalePtr, REDRAW_ALL);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ComputeFormat --
*
* This procedure is invoked to recompute the "format" field
* of a scale's widget record, which determines how the value
* of the scale is converted to a string.
*
* Results:
* None.
*
* Side effects:
* The format field of scalePtr is modified.
*
*----------------------------------------------------------------------
*/
static void
ComputeFormat(scalePtr)
Scale *scalePtr; /* Information about scale widget. */
{
double maxValue, x;
int mostSigDigit, numDigits, leastSigDigit, afterDecimal;
int eDigits, fDigits;
/*
* Compute the displacement from the decimal of the most significant
* digit required for any number in the scale's range.
*/
maxValue = fabs(scalePtr->fromValue);
x = fabs(scalePtr->toValue);
if (x > maxValue) {
maxValue = x;
}
if (maxValue == 0) {
maxValue = 1;
}
mostSigDigit = floor(log10(maxValue));
/*
* If the number of significant digits wasn't specified explicitly,
* compute it. It's the difference between the most significant
* digit needed to represent any number on the scale and the
* most significant digit of the smallest difference between
* numbers on the scale. In other words, display enough digits so
* that at least one digit will be different between any two adjacent
* positions of the scale.
*/
numDigits = scalePtr->digits;
if (numDigits <= 0) {
if (scalePtr->resolution > 0) {
/*
* A resolution was specified for the scale, so just use it.
*/
leastSigDigit = floor(log10(scalePtr->resolution));
} else {
/*
* No resolution was specified, so compute the difference
* in value between adjacent pixels and use it for the least
* significant digit.
*/
x = fabs(scalePtr->fromValue - scalePtr->toValue);
if (scalePtr->length > 0) {
x /= scalePtr->length;
}
if (x > 0){
leastSigDigit = floor(log10(x));
} else {
leastSigDigit = 0;
}
}
numDigits = mostSigDigit - leastSigDigit + 1;
if (numDigits < 1) {
numDigits = 1;
}
}
/*
* Compute the number of characters required using "e" format and
* "f" format, and then choose whichever one takes fewer characters.
*/
eDigits = numDigits + 4;
if (numDigits > 1) {
eDigits++; /* Decimal point. */
}
afterDecimal = numDigits - mostSigDigit - 1;
if (afterDecimal < 0) {
afterDecimal = 0;
}
fDigits = (mostSigDigit >= 0) ? mostSigDigit + afterDecimal : afterDecimal;
if (afterDecimal > 0) {
fDigits++; /* Decimal point. */
}
if (mostSigDigit < 0) {
fDigits++; /* Zero to left of decimal point. */
}
if (fDigits <= eDigits) {
sprintf(scalePtr->format, "%%.%df", afterDecimal);
} else {
sprintf(scalePtr->format, "%%.%de", numDigits-1);
}
}
/*
*----------------------------------------------------------------------
*
* ComputeScaleGeometry --
*
* This procedure is called to compute various geometrical
* information for a scale, 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 *scalePtr. The
* geometry manager gets told about the window's preferred size.
*
*----------------------------------------------------------------------
*/
static void
ComputeScaleGeometry(scalePtr)
register Scale *scalePtr; /* Information about widget. */
{
XCharStruct bbox;
char valueString[PRINT_CHARS];
int dummy, lineHeight, valuePixels, x, y, extraSpace;
/*
* Horizontal scales 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 (!scalePtr->vertical) {
lineHeight = scalePtr->fontPtr->ascent + scalePtr->fontPtr->descent;
y = scalePtr->inset;
extraSpace = 0;
if (scalePtr->labelLength != 0) {
scalePtr->horizLabelY = y + SPACING;
y += lineHeight + SPACING;
extraSpace = SPACING;
}
if (scalePtr->showValue) {
scalePtr->horizValueY = y + SPACING;
y += lineHeight + SPACING;
extraSpace = SPACING;
} else {
scalePtr->horizValueY = y;
}
y += extraSpace;
scalePtr->horizTroughY = y;
y += scalePtr->width + 2*scalePtr->borderWidth;
if (scalePtr->tickInterval != 0) {
scalePtr->horizTickY = y + SPACING;
y += lineHeight + 2*SPACING;
}
Tk_GeometryRequest(scalePtr->tkwin,
scalePtr->length + 2*scalePtr->inset, y + scalePtr->inset);
Tk_SetInternalBorder(scalePtr->tkwin, scalePtr->inset);
return;
}
/*
* Vertical scale: compute the amount of space needed to display
* the scales value by formatting strings for the two end points;
* use whichever length is longer.
*/
sprintf(valueString, scalePtr->format, scalePtr->fromValue);
XTextExtents(scalePtr->fontPtr, valueString, (int) strlen(valueString),
&dummy, &dummy, &dummy, &bbox);
valuePixels = bbox.rbearing - bbox.lbearing;
sprintf(valueString, scalePtr->format, scalePtr->toValue);
XTextExtents(scalePtr->fontPtr, valueString, (int) strlen(valueString),
&dummy, &dummy, &dummy, &bbox);
if (valuePixels < bbox.rbearing - bbox.lbearing) {
valuePixels = bbox.rbearing - bbox.lbearing;
}
/*
* Assign x-locations to the elements of the scale, working from
* left to right.
*/
x = scalePtr->inset;
if ((scalePtr->tickInterval != 0) && (scalePtr->showValue)) {
scalePtr->vertTickRightX = x + SPACING + valuePixels;
scalePtr->vertValueRightX = scalePtr->vertTickRightX + valuePixels
+ scalePtr->fontPtr->ascent/2;
x = scalePtr->vertValueRightX + SPACING;
} else if (scalePtr->tickInterval != 0) {
scalePtr->vertTickRightX = x + SPACING + valuePixels;
scalePtr->vertValueRightX = scalePtr->vertTickRightX;
x = scalePtr->vertTickRightX + SPACING;
} else if (scalePtr->showValue) {
scalePtr->vertTickRightX = x;
scalePtr->vertValueRightX = x + SPACING + valuePixels;
x = scalePtr->vertValueRightX + SPACING;
} else {
scalePtr->vertTickRightX = x;
scalePtr->vertValueRightX = x;
}
scalePtr->vertTroughX = x;
x += 2*scalePtr->borderWidth + scalePtr->width;
if (scalePtr->labelLength == 0) {
scalePtr->vertLabelX = 0;
} else {
XTextExtents(scalePtr->fontPtr, scalePtr->label,
scalePtr->labelLength, &dummy, &dummy, &dummy, &bbox);
scalePtr->vertLabelX = x + scalePtr->fontPtr->ascent/2 - bbox.lbearing;
x = scalePtr->vertLabelX + bbox.rbearing
+ scalePtr->fontPtr->ascent/2;
}
Tk_GeometryRequest(scalePtr->tkwin, x + scalePtr->inset,
scalePtr->length + 2*scalePtr->inset);
Tk_SetInternalBorder(scalePtr->tkwin, scalePtr->inset);
}
/*
*--------------------------------------------------------------
*
* DisplayVerticalScale --
*
* This procedure redraws the contents of a vertical scale
* 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:
* There is no return value. If only a part of the scale needs
* to be redrawn, then drawnAreaPtr is modified to reflect the
* area that was actually modified.
*
* Side effects:
* Information appears on the screen.
*
*--------------------------------------------------------------
*/
static void
DisplayVerticalScale(scalePtr, drawable, drawnAreaPtr)
Scale *scalePtr; /* Widget record for scale. */
Drawable drawable; /* Where to display scale (window
* or pixmap). */
XRectangle *drawnAreaPtr; /* Initally contains area of window;
* if only a part of the scale is
* redrawn, gets modified to reflect
* the part of the window that was
* redrawn. */
{
Tk_Window tkwin = scalePtr->tkwin;
int x, y, width, height, shadowWidth;
double tickValue;
Tk_3DBorder sliderBorder;
/*
* Display the information from left to right across the window.
*/
if (!(scalePtr->flags & REDRAW_OTHER)) {
drawnAreaPtr->x = scalePtr->vertTickRightX;
drawnAreaPtr->y = scalePtr->inset;
drawnAreaPtr->width = scalePtr->vertTroughX + scalePtr->width
+ 2*scalePtr->borderWidth - scalePtr->vertTickRightX;
drawnAreaPtr->height -= 2*scalePtr->inset;
}
Tk_Fill3DRectangle(tkwin, drawable, scalePtr->bgBorder,
drawnAreaPtr->x, drawnAreaPtr->y, drawnAreaPtr->width,
drawnAreaPtr->height, 0, TK_RELIEF_FLAT);
if (scalePtr->flags & REDRAW_OTHER) {
/*
* Display the tick marks.
*/
if (scalePtr->tickInterval != 0) {
for (tickValue = scalePtr->fromValue; ;
tickValue += scalePtr->tickInterval) {
/*
* The RoundToResolution call gets rid of accumulated
* round-off errors, if any.
*/
tickValue = RoundToResolution(scalePtr, tickValue);
if (scalePtr->toValue >= scalePtr->fromValue) {
if (tickValue > scalePtr->toValue) {
break;
}
} else {
if (tickValue < scalePtr->toValue) {
break;
}
}
DisplayVerticalValue(scalePtr, drawable, tickValue,
scalePtr->vertTickRightX);
}
}
}
/*
* Display the value, if it is desired.
*/
if (scalePtr->showValue) {
DisplayVerticalValue(scalePtr, drawable, scalePtr->value,
scalePtr->vertValueRightX);
}
/*
* Display the trough and the slider.
*/
Tk_Draw3DRectangle(tkwin, drawable,
scalePtr->bgBorder, scalePtr->vertTroughX, scalePtr->inset,
scalePtr->width + 2*scalePtr->borderWidth,
Tk_Height(tkwin) - 2*scalePtr->inset, scalePtr->borderWidth,
TK_RELIEF_SUNKEN);
XFillRectangle(scalePtr->display, drawable, scalePtr->troughGC,
scalePtr->vertTroughX + scalePtr->borderWidth,
scalePtr->inset + scalePtr->borderWidth,
(unsigned) scalePtr->width,
(unsigned) (Tk_Height(tkwin) - 2*scalePtr->inset
- 2*scalePtr->borderWidth));
if (scalePtr->state == tkActiveUid) {
sliderBorder = scalePtr->activeBorder;
} else {
sliderBorder = scalePtr->bgBorder;
}
width = scalePtr->width;
height = scalePtr->sliderLength/2;
x = scalePtr->vertTroughX + scalePtr->borderWidth;
y = ValueToPixel(scalePtr, scalePtr->value) - height;
shadowWidth = scalePtr->borderWidth/2;
if (shadowWidth == 0) {
shadowWidth = 1;
}
Tk_Draw3DRectangle(tkwin, drawable, sliderBorder, x, y, width,
2*height, shadowWidth, scalePtr->sliderRelief);
x += shadowWidth;
y += shadowWidth;
width -= 2*shadowWidth;
height -= shadowWidth;
Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y, width,
height, shadowWidth, scalePtr->sliderRelief);
Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y+height,
width, height, shadowWidth, scalePtr->sliderRelief);
/*
* Draw the label to the right of the scale.
*/
if ((scalePtr->flags & REDRAW_OTHER) && (scalePtr->labelLength != 0)) {
XDrawString(scalePtr->display, drawable,
scalePtr->textGC, scalePtr->vertLabelX,
scalePtr->inset + (3*scalePtr->fontPtr->ascent)/2,
scalePtr->label, scalePtr->labelLength);
}
}
/*
*----------------------------------------------------------------------
*
* DisplayVerticalValue --
*
* This procedure is called to display values (scale readings)
* for vertically-oriented scales.
*
* 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 scale that corresponds to "value".
*
*----------------------------------------------------------------------
*/
static void
DisplayVerticalValue(scalePtr, drawable, value, rightEdge)
register Scale *scalePtr; /* Information about widget in which to
* display value. */
Drawable drawable; /* Pixmap or window in which to draw
* the value. */
double 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 = scalePtr->tkwin;
int y, dummy, length;
char valueString[PRINT_CHARS];
XCharStruct bbox;
y = ValueToPixel(scalePtr, value) + scalePtr->fontPtr->ascent/2;
sprintf(valueString, scalePtr->format, value);
length = strlen(valueString);
XTextExtents(scalePtr->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) < (scalePtr->inset + SPACING)) {
y = scalePtr->inset + SPACING + bbox.ascent;
}
if ((y + bbox.descent) > (Tk_Height(tkwin) - scalePtr->inset - SPACING)) {
y = Tk_Height(tkwin) - scalePtr->inset - SPACING - bbox.descent;
}
XDrawString(scalePtr->display, drawable, scalePtr->textGC,
rightEdge - bbox.rbearing, y, valueString, length);
}
/*
*--------------------------------------------------------------
*
* DisplayHorizontalScale --
*
* This procedure redraws the contents of a horizontal scale
* 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:
* There is no return value. If only a part of the scale needs
* to be redrawn, then drawnAreaPtr is modified to reflect the
* area that was actually modified.
*
* Side effects:
* Information appears on the screen.
*
*--------------------------------------------------------------
*/
static void
DisplayHorizontalScale(scalePtr, drawable, drawnAreaPtr)
Scale *scalePtr; /* Widget record for scale. */
Drawable drawable; /* Where to display scale (window
* or pixmap). */
XRectangle *drawnAreaPtr; /* Initally contains area of window;
* if only a part of the scale is
* redrawn, gets modified to reflect
* the part of the window that was
* redrawn. */
{
register Tk_Window tkwin = scalePtr->tkwin;
int x, y, width, height, shadowWidth;
double tickValue;
Tk_3DBorder sliderBorder;
/*
* Display the information from bottom to top across the window.
*/
if (!(scalePtr->flags & REDRAW_OTHER)) {
drawnAreaPtr->x = scalePtr->inset;
drawnAreaPtr->y = scalePtr->horizValueY;
drawnAreaPtr->width -= 2*scalePtr->inset;
drawnAreaPtr->height = scalePtr->horizTroughY + scalePtr->width
+ 2*scalePtr->borderWidth - scalePtr->horizValueY;
}
Tk_Fill3DRectangle(tkwin, drawable, scalePtr->bgBorder,
drawnAreaPtr->x, drawnAreaPtr->y, drawnAreaPtr->width,
drawnAreaPtr->height, 0, TK_RELIEF_FLAT);
if (scalePtr->flags & REDRAW_OTHER) {
/*
* Display the tick marks.
*/
if (scalePtr->tickInterval != 0) {
for (tickValue = scalePtr->fromValue; ;
tickValue += scalePtr->tickInterval) {
/*
* The RoundToResolution call gets rid of accumulated
* round-off errors, if any.
*/
tickValue = RoundToResolution(scalePtr, tickValue);
if (scalePtr->toValue >= scalePtr->fromValue) {
if (tickValue > scalePtr->toValue) {
break;
}
} else {
if (tickValue < scalePtr->toValue) {
break;
}
}
DisplayHorizontalValue(scalePtr, drawable, tickValue,
scalePtr->horizTickY);
}
}
}
/*
* Display the value, if it is desired.
*/
if (scalePtr->showValue) {
DisplayHorizontalValue(scalePtr, drawable, scalePtr->value,
scalePtr->horizValueY);
}
/*
* Display the trough and the slider.
*/
y = scalePtr->horizTroughY;
Tk_Draw3DRectangle(tkwin, drawable,
scalePtr->bgBorder, scalePtr->inset, y,
Tk_Width(tkwin) - 2*scalePtr->inset,
scalePtr->width + 2*scalePtr->borderWidth,
scalePtr->borderWidth, TK_RELIEF_SUNKEN);
XFillRectangle(scalePtr->display, drawable, scalePtr->troughGC,
scalePtr->inset + scalePtr->borderWidth,
y + scalePtr->borderWidth,
(unsigned) (Tk_Width(tkwin) - 2*scalePtr->inset
- 2*scalePtr->borderWidth),
(unsigned) scalePtr->width);
if (scalePtr->state == tkActiveUid) {
sliderBorder = scalePtr->activeBorder;
} else {
sliderBorder = scalePtr->bgBorder;
}
width = scalePtr->sliderLength/2;
height = scalePtr->width;
x = ValueToPixel(scalePtr, scalePtr->value) - width;
y += scalePtr->borderWidth;
shadowWidth = scalePtr->borderWidth/2;
if (shadowWidth == 0) {
shadowWidth = 1;
}
Tk_Draw3DRectangle(tkwin, drawable, sliderBorder,
x, y, 2*width, height, shadowWidth, scalePtr->sliderRelief);
x += shadowWidth;
y += shadowWidth;
width -= shadowWidth;
height -= 2*shadowWidth;
Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y, width, height,
shadowWidth, scalePtr->sliderRelief);
Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x+width, y,
width, height, shadowWidth, scalePtr->sliderRelief);
/*
* Draw the label at the top of the scale.
*/
if ((scalePtr->flags & REDRAW_OTHER) && (scalePtr->labelLength != 0)) {
XDrawString(scalePtr->display, drawable,
scalePtr->textGC, scalePtr->inset + scalePtr->fontPtr->ascent/2,
scalePtr->horizLabelY + scalePtr->fontPtr->ascent,
scalePtr->label, scalePtr->labelLength);
}
}
/*
*----------------------------------------------------------------------
*
* DisplayHorizontalValue --
*
* This procedure is called to display values (scale readings)
* for horizontally-oriented scales.
*
* 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 scale that corresponds to "value".
*
*----------------------------------------------------------------------
*/
static void
DisplayHorizontalValue(scalePtr, drawable, value, top)
register Scale *scalePtr; /* Information about widget in which to
* display value. */
Drawable drawable; /* Pixmap or window in which to draw
* the value. */
double value; /* X-coordinate of number to display,
* specified in application coords, not
* in pixels (we'll compute pixels). */
int top; /* Y-coordinate of top edge of text,
* specified in pixels. */
{
register Tk_Window tkwin = scalePtr->tkwin;
int x, y, dummy, length;
char valueString[PRINT_CHARS];
XCharStruct bbox;
x = ValueToPixel(scalePtr, value);
y = top + scalePtr->fontPtr->ascent;
sprintf(valueString, scalePtr->format, value);
length = strlen(valueString);
XTextExtents(scalePtr->fontPtr, valueString, length,
&dummy, &dummy, &dummy, &bbox);
/*
* Adjust the x-coordinate if necessary to keep the text entirely
* inside the window.
*/
x -= (bbox.rbearing - bbox.lbearing)/2;
if ((x + bbox.lbearing) < (scalePtr->inset + SPACING)) {
x = scalePtr->inset + SPACING - bbox.lbearing;
}
if ((x + bbox.rbearing) > (Tk_Width(tkwin) - scalePtr->inset)) {
x = Tk_Width(tkwin) - scalePtr->inset - SPACING - bbox.rbearing;
}
XDrawString(scalePtr->display, drawable, scalePtr->textGC, x, y,
valueString, length);
}
/*
*----------------------------------------------------------------------
*
* DisplayScale --
*
* This procedure is invoked as an idle handler to redisplay
* the contents of a scale widget.
*
* Results:
* None.
*
* Side effects:
* The scale gets redisplayed.
*
*----------------------------------------------------------------------
*/
static void
DisplayScale(clientData)
ClientData clientData; /* Widget record for scale. */
{
Scale *scalePtr = (Scale *) clientData;
Tk_Window tkwin = scalePtr->tkwin;
Tcl_Interp *interp = scalePtr->interp;
Pixmap pixmap;
int result;
char string[PRINT_CHARS];
XRectangle drawnArea;
if ((scalePtr->tkwin == NULL) || !Tk_IsMapped(scalePtr->tkwin)) {
goto done;
}
/*
* Invoke the scale's command if needed.
*/
Tcl_Preserve((ClientData) scalePtr);
Tcl_Preserve((ClientData) interp);
if ((scalePtr->flags & INVOKE_COMMAND) && (scalePtr->command != NULL)) {
sprintf(string, scalePtr->format, scalePtr->value);
result = Tcl_VarEval(interp, scalePtr->command, " ", string,
(char *) NULL);
if (result != TCL_OK) {
Tcl_AddErrorInfo(interp, "\n (command executed by scale)");
Tcl_BackgroundError(interp);
}
}
Tcl_Release((ClientData) interp);
scalePtr->flags &= ~INVOKE_COMMAND;
if (scalePtr->tkwin == NULL) {
Tcl_Release((ClientData) scalePtr);
return;
}
Tcl_Release((ClientData) scalePtr);
/*
* In order to avoid screen flashes, this procedure redraws
* the scale 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 = Tk_GetPixmap(scalePtr->display, Tk_WindowId(tkwin),
Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
drawnArea.x = 0;
drawnArea.y = 0;
drawnArea.width = Tk_Width(tkwin);
drawnArea.height = Tk_Height(tkwin);
/*
* Much of the redisplay is done totally differently for
* horizontal and vertical scales. Handle the part that's
* different.
*/
if (scalePtr->vertical) {
DisplayVerticalScale(scalePtr, pixmap, &drawnArea);
} else {
DisplayHorizontalScale(scalePtr, pixmap, &drawnArea);
}
/*
* Now handle the part of redisplay that is the same for
* horizontal and vertical scales: border and traversal
* highlight.
*/
if (scalePtr->flags & REDRAW_OTHER) {
if (scalePtr->relief != TK_RELIEF_FLAT) {
Tk_Draw3DRectangle(tkwin, pixmap, scalePtr->bgBorder,
scalePtr->highlightWidth, scalePtr->highlightWidth,
Tk_Width(tkwin) - 2*scalePtr->highlightWidth,
Tk_Height(tkwin) - 2*scalePtr->highlightWidth,
scalePtr->borderWidth, scalePtr->relief);
}
if (scalePtr->highlightWidth != 0) {
GC gc;
if (scalePtr->flags & GOT_FOCUS) {
gc = Tk_GCForColor(scalePtr->highlightColorPtr, pixmap);
} else {
gc = Tk_GCForColor(scalePtr->highlightBgColorPtr, pixmap);
}
Tk_DrawFocusHighlight(tkwin, gc, scalePtr->highlightWidth, pixmap);
}
}
/*
* Copy the information from the off-screen pixmap onto the screen,
* then delete the pixmap.
*/
XCopyArea(scalePtr->display, pixmap, Tk_WindowId(tkwin),
scalePtr->copyGC, drawnArea.x, drawnArea.y, drawnArea.width,
drawnArea.height, drawnArea.x, drawnArea.y);
Tk_FreePixmap(scalePtr->display, pixmap);
done:
scalePtr->flags &= ~REDRAW_ALL;
}
/*
*----------------------------------------------------------------------
*
* ScaleElement --
*
* Determine which part of a scale widget lies under a given
* point.
*
* Results:
* The return value is either TROUGH1, SLIDER, TROUGH2, or
* OTHER, depending on which of the scale's active elements
* (if any) is under the point at (x,y).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
ScaleElement(scalePtr, x, y)
Scale *scalePtr; /* Widget record for scale. */
int x, y; /* Coordinates within scalePtr's window. */
{
int sliderFirst;
if (scalePtr->vertical) {
if ((x < scalePtr->vertTroughX)
|| (x >= (scalePtr->vertTroughX + 2*scalePtr->borderWidth +
scalePtr->width))) {
return OTHER;
}
if ((y < scalePtr->inset)
|| (y >= (Tk_Height(scalePtr->tkwin) - scalePtr->inset))) {
return OTHER;
}
sliderFirst = ValueToPixel(scalePtr, scalePtr->value)
- scalePtr->sliderLength/2;
if (y < sliderFirst) {
return TROUGH1;
}
if (y < (sliderFirst+scalePtr->sliderLength)) {
return SLIDER;
}
return TROUGH2;
}
if ((y < scalePtr->horizTroughY)
|| (y >= (scalePtr->horizTroughY + 2*scalePtr->borderWidth +
scalePtr->width))) {
return OTHER;
}
if ((x < scalePtr->inset)
|| (x >= (Tk_Width(scalePtr->tkwin) - scalePtr->inset))) {
return OTHER;
}
sliderFirst = ValueToPixel(scalePtr, scalePtr->value)
- scalePtr->sliderLength/2;
if (x < sliderFirst) {
return TROUGH1;
}
if (x < (sliderFirst+scalePtr->sliderLength)) {
return SLIDER;
}
return TROUGH2;
}
/*
*----------------------------------------------------------------------
*
* PixelToValue --
*
* Given a pixel within a scale window, return the scale
* reading corresponding to that pixel.
*
* Results:
* A double-precision scale reading. If the value is outside
* the legal range for the scale then it's rounded to the nearest
* end of the scale.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static double
PixelToValue(scalePtr, x, y)
register Scale *scalePtr; /* Information about widget. */
int x, y; /* Coordinates of point within
* window. */
{
double value, pixelRange;
if (scalePtr->vertical) {
pixelRange = Tk_Height(scalePtr->tkwin) - scalePtr->sliderLength
- 2*scalePtr->inset - 2*scalePtr->borderWidth;
value = y;
} else {
pixelRange = Tk_Width(scalePtr->tkwin) - scalePtr->sliderLength
- 2*scalePtr->inset - 2*scalePtr->borderWidth;
value = x;
}
if (pixelRange <= 0) {
/*
* Not enough room for the slider to actually slide: just return
* the scale's current value.
*/
return scalePtr->value;
}
value -= scalePtr->sliderLength/2 + scalePtr->inset
+ scalePtr->borderWidth;
value /= pixelRange;
if (value < 0) {
value = 0;
}
if (value > 1) {
value = 1;
}
value = scalePtr->fromValue +
value * (scalePtr->toValue - scalePtr->fromValue);
return RoundToResolution(scalePtr, value);
}
/*
*----------------------------------------------------------------------
*
* ValueToPixel --
*
* Given a reading of the scale, return the x-coordinate or
* y-coordinate corresponding to that reading, depending on
* whether the scale 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 scale.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
ValueToPixel(scalePtr, value)
register Scale *scalePtr; /* Information about widget. */
double value; /* Reading of the widget. */
{
int y, pixelRange;
double valueRange;
valueRange = scalePtr->toValue - scalePtr->fromValue;
pixelRange = (scalePtr->vertical ? Tk_Height(scalePtr->tkwin)
: Tk_Width(scalePtr->tkwin)) - scalePtr->sliderLength
- 2*scalePtr->inset - 2*scalePtr->borderWidth;
if (valueRange == 0) {
y = 0;
} else {
y = (int) ((value - scalePtr->fromValue) * pixelRange
/ valueRange + 0.5);
if (y < 0) {
y = 0;
} else if (y > pixelRange) {
y = pixelRange;
}
}
y += scalePtr->sliderLength/2 + scalePtr->inset + scalePtr->borderWidth;
return y;
}
/*
*--------------------------------------------------------------
*
* ScaleEventProc --
*
* This procedure is invoked by the Tk dispatcher for various
* events on scales.
*
* Results:
* None.
*
* Side effects:
* When the window gets deleted, internal structures get
* cleaned up. When it gets exposed, it is redisplayed.
*
*--------------------------------------------------------------
*/
static void
ScaleEventProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
XEvent *eventPtr; /* Information about event. */
{
Scale *scalePtr = (Scale *) clientData;
if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
EventuallyRedrawScale(scalePtr, REDRAW_ALL);
} else if (eventPtr->type == DestroyNotify) {
if (scalePtr->tkwin != NULL) {
scalePtr->tkwin = NULL;
Tcl_DeleteCommand(scalePtr->interp,
Tcl_GetCommandName(scalePtr->interp, scalePtr->widgetCmd));
}
if (scalePtr->flags & REDRAW_ALL) {
Tcl_CancelIdleCall(DisplayScale, (ClientData) scalePtr);
}
Tcl_EventuallyFree((ClientData) scalePtr, DestroyScale);
} else if (eventPtr->type == ConfigureNotify) {
ComputeScaleGeometry(scalePtr);
EventuallyRedrawScale(scalePtr, REDRAW_ALL);
} else if (eventPtr->type == FocusIn) {
if (eventPtr->xfocus.detail != NotifyInferior) {
scalePtr->flags |= GOT_FOCUS;
if (scalePtr->highlightWidth > 0) {
EventuallyRedrawScale(scalePtr, REDRAW_ALL);
}
}
} else if (eventPtr->type == FocusOut) {
if (eventPtr->xfocus.detail != NotifyInferior) {
scalePtr->flags &= ~GOT_FOCUS;
if (scalePtr->highlightWidth > 0) {
EventuallyRedrawScale(scalePtr, REDRAW_ALL);
}
}
}
}
/*
*----------------------------------------------------------------------
*
* ScaleCmdDeletedProc --
*
* 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
ScaleCmdDeletedProc(clientData)
ClientData clientData; /* Pointer to widget record for widget. */
{
Scale *scalePtr = (Scale *) clientData;
Tk_Window tkwin = scalePtr->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) {
scalePtr->tkwin = NULL;
Tk_DestroyWindow(tkwin);
}
}
/*
*--------------------------------------------------------------
*
* SetScaleValue --
*
* This procedure changes the value of a scale and invokes
* a Tcl command to reflect the current position of a scale
*
* Results:
* None.
*
* Side effects:
* A Tcl command is invoked, and an additional error-processing
* command may also be invoked. The scale's slider is redrawn.
*
*--------------------------------------------------------------
*/
static void
SetScaleValue(scalePtr, value, setVar, invokeCommand)
register Scale *scalePtr; /* Info about widget. */
double value; /* New value for scale. Gets adjusted
* if it's off the scale. */
int setVar; /* Non-zero means reflect new value through
* to associated variable, if any. */
int invokeCommand; /* Non-zero means invoked -command option
* to notify of new value, 0 means don't. */
{
char string[PRINT_CHARS];
value = RoundToResolution(scalePtr, value);
if ((value < scalePtr->fromValue)
^ (scalePtr->toValue < scalePtr->fromValue)) {
value = scalePtr->fromValue;
}
if ((value > scalePtr->toValue)
^ (scalePtr->toValue < scalePtr->fromValue)) {
value = scalePtr->toValue;
}
if (scalePtr->flags & NEVER_SET) {
scalePtr->flags &= ~NEVER_SET;
} else if (scalePtr->value == value) {
return;
}
scalePtr->value = value;
if (invokeCommand) {
scalePtr->flags |= INVOKE_COMMAND;
}
EventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
if (setVar && (scalePtr->varName != NULL)) {
sprintf(string, scalePtr->format, scalePtr->value);
scalePtr->flags |= SETTING_VAR;
Tcl_SetVar(scalePtr->interp, scalePtr->varName, string,
TCL_GLOBAL_ONLY);
scalePtr->flags &= ~SETTING_VAR;
}
}
/*
*--------------------------------------------------------------
*
* EventuallyRedrawScale --
*
* Arrange for part or all of a scale 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
EventuallyRedrawScale(scalePtr, what)
register Scale *scalePtr; /* Information about widget. */
int what; /* What to redraw: REDRAW_SLIDER
* or REDRAW_ALL. */
{
if ((what == 0) || (scalePtr->tkwin == NULL)
|| !Tk_IsMapped(scalePtr->tkwin)) {
return;
}
if ((scalePtr->flags & REDRAW_ALL) == 0) {
Tcl_DoWhenIdle(DisplayScale, (ClientData) scalePtr);
}
scalePtr->flags |= what;
}
/*
*--------------------------------------------------------------
*
* RoundToResolution --
*
* Round a given floating-point value to the nearest multiple
* of the scale's resolution.
*
* Results:
* The return value is the rounded result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static double
RoundToResolution(scalePtr, value)
Scale *scalePtr; /* Information about scale widget. */
double value; /* Value to round. */
{
double rem, new;
if (scalePtr->resolution <= 0) {
return value;
}
new = scalePtr->resolution * floor(value/scalePtr->resolution);
rem = value - new;
if (rem < 0) {
if (rem <= -scalePtr->resolution/2) {
new -= scalePtr->resolution;
}
} else {
if (rem >= scalePtr->resolution/2) {
new += scalePtr->resolution;
}
}
return new;
}
/*
*----------------------------------------------------------------------
*
* ScaleVarProc --
*
* This procedure is invoked by Tcl whenever someone modifies a
* variable associated with a scale widget.
*
* Results:
* NULL is always returned.
*
* Side effects:
* The value displayed in the scale will change to match the
* variable's new value. If the variable has a bogus value then
* it is reset to the value of the scale.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static char *
ScaleVarProc(clientData, interp, name1, name2, flags)
ClientData clientData; /* Information about button. */
Tcl_Interp *interp; /* Interpreter containing variable. */
char *name1; /* Name of variable. */
char *name2; /* Second part of variable name. */
int flags; /* Information about what happened. */
{
register Scale *scalePtr = (Scale *) clientData;
char *stringValue, *end, *result;
double value;
/*
* If the variable is unset, then immediately recreate it unless
* the whole interpreter is going away.
*/
if (flags & TCL_TRACE_UNSETS) {
if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
Tcl_TraceVar(interp, scalePtr->varName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ScaleVarProc, clientData);
scalePtr->flags |= NEVER_SET;
SetScaleValue(scalePtr, scalePtr->value, 1, 0);
}
return (char *) NULL;
}
/*
* If we came here because we updated the variable (in SetScaleValue),
* then ignore the trace. Otherwise update the scale with the value
* of the variable.
*/
if (scalePtr->flags & SETTING_VAR) {
return (char *) NULL;
}
result = NULL;
stringValue = Tcl_GetVar(interp, scalePtr->varName, TCL_GLOBAL_ONLY);
if (stringValue != NULL) {
value = strtod(stringValue, &end);
if ((end == stringValue) || (*end != 0)) {
result = "can't assign non-numeric value to scale variable";
} else {
scalePtr->value = RoundToResolution(scalePtr, value);
}
/*
* This code is a bit tricky because it sets the scale's value before
* calling SetScaleValue. This way, SetScaleValue won't bother to
* set the variable again or to invoke the -command. However, it
* also won't redisplay the scale, so we have to ask for that
* explicitly.
*/
SetScaleValue(scalePtr, scalePtr->value, 1, 0);
EventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
}
return result;
}
Reference in New Issue Copy Permalink