1448 lines
41 KiB
C
1448 lines
41 KiB
C
/*
|
||
* tkScale.c --
|
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*
|
||
* This module implements a scale widgets for the Tk toolkit. A scale
|
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* 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
|
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* 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.
|
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* Copyright (c) 1994-1997 Sun Microsystems, Inc.
|
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* Copyright (c) 1998-2000 by Scriptics Corporation.
|
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*
|
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* See the file "license.terms" for information on usage and redistribution of
|
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||
*/
|
||
|
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#include "default.h"
|
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#include "tkInt.h"
|
||
#include "tkScale.h"
|
||
|
||
#if defined(_WIN32)
|
||
#define snprintf _snprintf
|
||
#endif
|
||
|
||
/*
|
||
* The following table defines the legal values for the -orient option. It is
|
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* used together with the "enum orient" declaration in tkScale.h.
|
||
*/
|
||
|
||
static const char *const orientStrings[] = {
|
||
"horizontal", "vertical", NULL
|
||
};
|
||
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/*
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* The following table defines the legal values for the -state option. It is
|
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* used together with the "enum state" declaration in tkScale.h.
|
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*/
|
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|
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static const char *const stateStrings[] = {
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"active", "disabled", "normal", NULL
|
||
};
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||
|
||
static const Tk_OptionSpec optionSpecs[] = {
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{TK_OPTION_BORDER, "-activebackground", "activeBackground", "Foreground",
|
||
DEF_SCALE_ACTIVE_BG_COLOR, -1, Tk_Offset(TkScale, activeBorder),
|
||
0, DEF_SCALE_ACTIVE_BG_MONO, 0},
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||
{TK_OPTION_BORDER, "-background", "background", "Background",
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DEF_SCALE_BG_COLOR, -1, Tk_Offset(TkScale, bgBorder),
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||
0, DEF_SCALE_BG_MONO, 0},
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||
{TK_OPTION_DOUBLE, "-bigincrement", "bigIncrement", "BigIncrement",
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||
DEF_SCALE_BIG_INCREMENT, -1, Tk_Offset(TkScale, bigIncrement),
|
||
0, 0, 0},
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||
{TK_OPTION_SYNONYM, "-bd", NULL, NULL,
|
||
NULL, 0, -1, 0, "-borderwidth", 0},
|
||
{TK_OPTION_SYNONYM, "-bg", NULL, NULL,
|
||
NULL, 0, -1, 0, "-background", 0},
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||
{TK_OPTION_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
|
||
DEF_SCALE_BORDER_WIDTH, -1, Tk_Offset(TkScale, borderWidth),
|
||
0, 0, 0},
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||
{TK_OPTION_STRING, "-command", "command", "Command",
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||
DEF_SCALE_COMMAND, -1, Tk_Offset(TkScale, command),
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||
TK_OPTION_NULL_OK, 0, 0},
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||
{TK_OPTION_CURSOR, "-cursor", "cursor", "Cursor",
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||
DEF_SCALE_CURSOR, -1, Tk_Offset(TkScale, cursor),
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||
TK_OPTION_NULL_OK, 0, 0},
|
||
{TK_OPTION_INT, "-digits", "digits", "Digits",
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||
DEF_SCALE_DIGITS, -1, Tk_Offset(TkScale, digits),
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0, 0, 0},
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{TK_OPTION_SYNONYM, "-fg", "foreground", NULL,
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||
NULL, 0, -1, 0, "-foreground", 0},
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{TK_OPTION_FONT, "-font", "font", "Font",
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||
DEF_SCALE_FONT, -1, Tk_Offset(TkScale, tkfont), 0, 0, 0},
|
||
{TK_OPTION_COLOR, "-foreground", "foreground", "Foreground",
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||
DEF_SCALE_FG_COLOR, -1, Tk_Offset(TkScale, textColorPtr), 0,
|
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(ClientData) DEF_SCALE_FG_MONO, 0},
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{TK_OPTION_DOUBLE, "-from", "from", "From", DEF_SCALE_FROM, -1,
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||
Tk_Offset(TkScale, fromValue), 0, 0, 0},
|
||
{TK_OPTION_BORDER, "-highlightbackground", "highlightBackground",
|
||
"HighlightBackground", DEF_SCALE_HIGHLIGHT_BG_COLOR,
|
||
-1, Tk_Offset(TkScale, highlightBorder),
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0, DEF_SCALE_HIGHLIGHT_BG_MONO, 0},
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{TK_OPTION_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
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||
DEF_SCALE_HIGHLIGHT, -1, Tk_Offset(TkScale, highlightColorPtr),
|
||
0, 0, 0},
|
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{TK_OPTION_PIXELS, "-highlightthickness", "highlightThickness",
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"HighlightThickness", DEF_SCALE_HIGHLIGHT_WIDTH, -1,
|
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Tk_Offset(TkScale, highlightWidth), 0, 0, 0},
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{TK_OPTION_STRING, "-label", "label", "Label",
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||
DEF_SCALE_LABEL, -1, Tk_Offset(TkScale, label),
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||
TK_OPTION_NULL_OK, 0, 0},
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||
{TK_OPTION_PIXELS, "-length", "length", "Length",
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||
DEF_SCALE_LENGTH, -1, Tk_Offset(TkScale, length), 0, 0, 0},
|
||
{TK_OPTION_STRING_TABLE, "-orient", "orient", "Orient",
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DEF_SCALE_ORIENT, -1, Tk_Offset(TkScale, orient),
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0, orientStrings, 0},
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{TK_OPTION_RELIEF, "-relief", "relief", "Relief",
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DEF_SCALE_RELIEF, -1, Tk_Offset(TkScale, relief), 0, 0, 0},
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||
{TK_OPTION_INT, "-repeatdelay", "repeatDelay", "RepeatDelay",
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||
DEF_SCALE_REPEAT_DELAY, -1, Tk_Offset(TkScale, repeatDelay),
|
||
0, 0, 0},
|
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{TK_OPTION_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",
|
||
DEF_SCALE_REPEAT_INTERVAL, -1, Tk_Offset(TkScale, repeatInterval),
|
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0, 0, 0},
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||
{TK_OPTION_DOUBLE, "-resolution", "resolution", "Resolution",
|
||
DEF_SCALE_RESOLUTION, -1, Tk_Offset(TkScale, resolution),
|
||
0, 0, 0},
|
||
{TK_OPTION_BOOLEAN, "-showvalue", "showValue", "ShowValue",
|
||
DEF_SCALE_SHOW_VALUE, -1, Tk_Offset(TkScale, showValue),
|
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0, 0, 0},
|
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{TK_OPTION_PIXELS, "-sliderlength", "sliderLength", "SliderLength",
|
||
DEF_SCALE_SLIDER_LENGTH, -1, Tk_Offset(TkScale, sliderLength),
|
||
0, 0, 0},
|
||
{TK_OPTION_RELIEF, "-sliderrelief", "sliderRelief", "SliderRelief",
|
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DEF_SCALE_SLIDER_RELIEF, -1, Tk_Offset(TkScale, sliderRelief),
|
||
0, 0, 0},
|
||
{TK_OPTION_STRING_TABLE, "-state", "state", "State",
|
||
DEF_SCALE_STATE, -1, Tk_Offset(TkScale, state),
|
||
0, stateStrings, 0},
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||
{TK_OPTION_STRING, "-takefocus", "takeFocus", "TakeFocus",
|
||
DEF_SCALE_TAKE_FOCUS, Tk_Offset(TkScale, takeFocusPtr), -1,
|
||
TK_OPTION_NULL_OK, 0, 0},
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||
{TK_OPTION_DOUBLE, "-tickinterval", "tickInterval", "TickInterval",
|
||
DEF_SCALE_TICK_INTERVAL, -1, Tk_Offset(TkScale, tickInterval),
|
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0, 0, 0},
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||
{TK_OPTION_DOUBLE, "-to", "to", "To",
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||
DEF_SCALE_TO, -1, Tk_Offset(TkScale, toValue), 0, 0, 0},
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||
{TK_OPTION_COLOR, "-troughcolor", "troughColor", "Background",
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DEF_SCALE_TROUGH_COLOR, -1, Tk_Offset(TkScale, troughColorPtr),
|
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0, DEF_SCALE_TROUGH_MONO, 0},
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||
{TK_OPTION_STRING, "-variable", "variable", "Variable",
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DEF_SCALE_VARIABLE, Tk_Offset(TkScale, varNamePtr), -1,
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TK_OPTION_NULL_OK, 0, 0},
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{TK_OPTION_PIXELS, "-width", "width", "Width",
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DEF_SCALE_WIDTH, -1, Tk_Offset(TkScale, width), 0, 0, 0},
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{TK_OPTION_END, NULL, NULL, NULL, NULL, 0, -1, 0, 0, 0}
|
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};
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/*
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* The following tables define the scale widget commands and map the indexes
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* into the string tables into a single enumerated type used to dispatch the
|
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* scale widget command.
|
||
*/
|
||
|
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static const char *const commandNames[] = {
|
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"cget", "configure", "coords", "get", "identify", "set", NULL
|
||
};
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||
|
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enum command {
|
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COMMAND_CGET, COMMAND_CONFIGURE, COMMAND_COORDS, COMMAND_GET,
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COMMAND_IDENTIFY, COMMAND_SET
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};
|
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|
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/*
|
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* Forward declarations for procedures defined later in this file:
|
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*/
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static void ComputeFormat(TkScale *scalePtr);
|
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static void ComputeScaleGeometry(TkScale *scalePtr);
|
||
static int ConfigureScale(Tcl_Interp *interp, TkScale *scalePtr,
|
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int objc, Tcl_Obj *const objv[]);
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static void DestroyScale(char *memPtr);
|
||
static void ScaleCmdDeletedProc(ClientData clientData);
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static void ScaleEventProc(ClientData clientData,
|
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XEvent *eventPtr);
|
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static char * ScaleVarProc(ClientData clientData,
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Tcl_Interp *interp, const char *name1,
|
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const char *name2, int flags);
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static int ScaleWidgetObjCmd(ClientData clientData,
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Tcl_Interp *interp, int objc,
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Tcl_Obj *const objv[]);
|
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static void ScaleWorldChanged(ClientData instanceData);
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static void ScaleSetVariable(TkScale *scalePtr);
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||
|
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/*
|
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* The structure below defines scale class behavior by means of procedures
|
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* that can be invoked from generic window code.
|
||
*/
|
||
|
||
static const Tk_ClassProcs scaleClass = {
|
||
sizeof(Tk_ClassProcs), /* size */
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ScaleWorldChanged, /* worldChangedProc */
|
||
NULL, /* createProc */
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||
NULL /* modalProc */
|
||
};
|
||
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/*
|
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*--------------------------------------------------------------
|
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*
|
||
* Tk_ScaleObjCmd --
|
||
*
|
||
* 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_ScaleObjCmd(
|
||
ClientData clientData, /* NULL. */
|
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Tcl_Interp *interp, /* Current interpreter. */
|
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int objc, /* Number of arguments. */
|
||
Tcl_Obj *const objv[]) /* Argument values. */
|
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{
|
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register TkScale *scalePtr;
|
||
Tk_OptionTable optionTable;
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||
Tk_Window tkwin;
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||
|
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if (objc < 2) {
|
||
Tcl_WrongNumArgs(interp, 1, objv, "pathName ?-option value ...?");
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
tkwin = Tk_CreateWindowFromPath(interp, Tk_MainWindow(interp),
|
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Tcl_GetString(objv[1]), NULL);
|
||
if (tkwin == NULL) {
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* Create the option table for this widget class. If it has already been
|
||
* created, the cached pointer will be returned.
|
||
*/
|
||
|
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optionTable = Tk_CreateOptionTable(interp, optionSpecs);
|
||
|
||
Tk_SetClass(tkwin, "Scale");
|
||
scalePtr = TkpCreateScale(tkwin);
|
||
|
||
/*
|
||
* Initialize fields that won't be initialized by ConfigureScale, or which
|
||
* ConfigureScale expects to have reasonable values (e.g. resource
|
||
* pointers).
|
||
*/
|
||
|
||
scalePtr->tkwin = tkwin;
|
||
scalePtr->display = Tk_Display(tkwin);
|
||
scalePtr->interp = interp;
|
||
scalePtr->widgetCmd = Tcl_CreateObjCommand(interp,
|
||
Tk_PathName(scalePtr->tkwin), ScaleWidgetObjCmd,
|
||
scalePtr, ScaleCmdDeletedProc);
|
||
scalePtr->optionTable = optionTable;
|
||
scalePtr->orient = ORIENT_VERTICAL;
|
||
scalePtr->width = 0;
|
||
scalePtr->length = 0;
|
||
scalePtr->value = 0.0;
|
||
scalePtr->varNamePtr = NULL;
|
||
scalePtr->fromValue = 0.0;
|
||
scalePtr->toValue = 0.0;
|
||
scalePtr->tickInterval = 0.0;
|
||
scalePtr->resolution = 1.0;
|
||
scalePtr->digits = 0;
|
||
scalePtr->bigIncrement = 0.0;
|
||
scalePtr->command = NULL;
|
||
scalePtr->repeatDelay = 0;
|
||
scalePtr->repeatInterval = 0;
|
||
scalePtr->label = NULL;
|
||
scalePtr->labelLength = 0;
|
||
scalePtr->state = STATE_NORMAL;
|
||
scalePtr->borderWidth = 0;
|
||
scalePtr->bgBorder = NULL;
|
||
scalePtr->activeBorder = NULL;
|
||
scalePtr->sliderRelief = TK_RELIEF_RAISED;
|
||
scalePtr->troughColorPtr = NULL;
|
||
scalePtr->troughGC = None;
|
||
scalePtr->copyGC = None;
|
||
scalePtr->tkfont = NULL;
|
||
scalePtr->textColorPtr = NULL;
|
||
scalePtr->textGC = None;
|
||
scalePtr->relief = TK_RELIEF_FLAT;
|
||
scalePtr->highlightWidth = 0;
|
||
scalePtr->highlightBorder = 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->fontHeight = 0;
|
||
scalePtr->cursor = None;
|
||
scalePtr->takeFocusPtr = NULL;
|
||
scalePtr->flags = NEVER_SET;
|
||
|
||
Tk_SetClassProcs(scalePtr->tkwin, &scaleClass, scalePtr);
|
||
Tk_CreateEventHandler(scalePtr->tkwin,
|
||
ExposureMask|StructureNotifyMask|FocusChangeMask,
|
||
ScaleEventProc, scalePtr);
|
||
|
||
if ((Tk_InitOptions(interp, (char *) scalePtr, optionTable, tkwin)
|
||
!= TCL_OK) ||
|
||
(ConfigureScale(interp, scalePtr, objc - 2, objv + 2) != TCL_OK)) {
|
||
Tk_DestroyWindow(scalePtr->tkwin);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* The widget was just created, no command callback must be invoked.
|
||
*/
|
||
|
||
scalePtr->flags &= ~INVOKE_COMMAND;
|
||
|
||
Tcl_SetObjResult(interp, TkNewWindowObj(scalePtr->tkwin));
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScaleWidgetObjCmd --
|
||
*
|
||
* 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
|
||
ScaleWidgetObjCmd(
|
||
ClientData clientData, /* Information about scale widget. */
|
||
Tcl_Interp *interp, /* Current interpreter. */
|
||
int objc, /* Number of arguments. */
|
||
Tcl_Obj *const objv[]) /* Argument strings. */
|
||
{
|
||
TkScale *scalePtr = clientData;
|
||
Tcl_Obj *objPtr;
|
||
int index, result;
|
||
|
||
if (objc < 2) {
|
||
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
|
||
return TCL_ERROR;
|
||
}
|
||
result = Tcl_GetIndexFromObjStruct(interp, objv[1], commandNames,
|
||
sizeof(char *), "option", 0, &index);
|
||
if (result != TCL_OK) {
|
||
return result;
|
||
}
|
||
Tcl_Preserve(scalePtr);
|
||
|
||
switch (index) {
|
||
case COMMAND_CGET:
|
||
if (objc != 3) {
|
||
Tcl_WrongNumArgs(interp, 1, objv, "cget option");
|
||
goto error;
|
||
}
|
||
objPtr = Tk_GetOptionValue(interp, (char *) scalePtr,
|
||
scalePtr->optionTable, objv[2], scalePtr->tkwin);
|
||
if (objPtr == NULL) {
|
||
goto error;
|
||
}
|
||
Tcl_SetObjResult(interp, objPtr);
|
||
break;
|
||
case COMMAND_CONFIGURE:
|
||
if (objc <= 3) {
|
||
objPtr = Tk_GetOptionInfo(interp, (char *) scalePtr,
|
||
scalePtr->optionTable,
|
||
(objc == 3) ? objv[2] : NULL, scalePtr->tkwin);
|
||
if (objPtr == NULL) {
|
||
goto error;
|
||
}
|
||
Tcl_SetObjResult(interp, objPtr);
|
||
} else {
|
||
result = ConfigureScale(interp, scalePtr, objc-2, objv+2);
|
||
}
|
||
break;
|
||
case COMMAND_COORDS: {
|
||
int x, y;
|
||
double value;
|
||
Tcl_Obj *coords[2];
|
||
|
||
if ((objc != 2) && (objc != 3)) {
|
||
Tcl_WrongNumArgs(interp, 1, objv, "coords ?value?");
|
||
goto error;
|
||
}
|
||
if (objc == 3) {
|
||
if (Tcl_GetDoubleFromObj(interp, objv[2], &value) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
} else {
|
||
value = scalePtr->value;
|
||
}
|
||
if (scalePtr->orient == ORIENT_VERTICAL) {
|
||
x = scalePtr->vertTroughX + scalePtr->width/2
|
||
+ scalePtr->borderWidth;
|
||
y = TkScaleValueToPixel(scalePtr, value);
|
||
} else {
|
||
x = TkScaleValueToPixel(scalePtr, value);
|
||
y = scalePtr->horizTroughY + scalePtr->width/2
|
||
+ scalePtr->borderWidth;
|
||
}
|
||
coords[0] = Tcl_NewIntObj(x);
|
||
coords[1] = Tcl_NewIntObj(y);
|
||
Tcl_SetObjResult(interp, Tcl_NewListObj(2, coords));
|
||
break;
|
||
}
|
||
case COMMAND_GET: {
|
||
double value;
|
||
int x, y;
|
||
|
||
if ((objc != 2) && (objc != 4)) {
|
||
Tcl_WrongNumArgs(interp, 1, objv, "get ?x y?");
|
||
goto error;
|
||
}
|
||
if (objc == 2) {
|
||
value = scalePtr->value;
|
||
} else {
|
||
if ((Tcl_GetIntFromObj(interp, objv[2], &x) != TCL_OK) ||
|
||
(Tcl_GetIntFromObj(interp, objv[3], &y) != TCL_OK)) {
|
||
goto error;
|
||
}
|
||
value = TkScalePixelToValue(scalePtr, x, y);
|
||
}
|
||
Tcl_SetObjResult(interp, Tcl_ObjPrintf(scalePtr->format, value));
|
||
break;
|
||
}
|
||
case COMMAND_IDENTIFY: {
|
||
int x, y;
|
||
const char *zone = "";
|
||
|
||
if (objc != 4) {
|
||
Tcl_WrongNumArgs(interp, 1, objv, "identify x y");
|
||
goto error;
|
||
}
|
||
if ((Tcl_GetIntFromObj(interp, objv[2], &x) != TCL_OK)
|
||
|| (Tcl_GetIntFromObj(interp, objv[3], &y) != TCL_OK)) {
|
||
goto error;
|
||
}
|
||
switch (TkpScaleElement(scalePtr, x, y)) {
|
||
case TROUGH1: zone = "trough1"; break;
|
||
case SLIDER: zone = "slider"; break;
|
||
case TROUGH2: zone = "trough2"; break;
|
||
}
|
||
Tcl_SetObjResult(interp, Tcl_NewStringObj(zone, -1));
|
||
break;
|
||
}
|
||
case COMMAND_SET: {
|
||
double value;
|
||
|
||
if (objc != 3) {
|
||
Tcl_WrongNumArgs(interp, 1, objv, "set value");
|
||
goto error;
|
||
}
|
||
if (Tcl_GetDoubleFromObj(interp, objv[2], &value) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
if (scalePtr->state != STATE_DISABLED) {
|
||
TkScaleSetValue(scalePtr, value, 1, 1);
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
Tcl_Release(scalePtr);
|
||
return result;
|
||
|
||
error:
|
||
Tcl_Release(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(
|
||
char *memPtr) /* Info about scale widget. */
|
||
{
|
||
register TkScale *scalePtr = (TkScale *) memPtr;
|
||
|
||
scalePtr->flags |= SCALE_DELETED;
|
||
|
||
Tcl_DeleteCommandFromToken(scalePtr->interp, scalePtr->widgetCmd);
|
||
if (scalePtr->flags & REDRAW_PENDING) {
|
||
Tcl_CancelIdleCall(TkpDisplayScale, scalePtr);
|
||
}
|
||
|
||
/*
|
||
* Free up all the stuff that requires special handling, then let
|
||
* Tk_FreeOptions handle all the standard option-related stuff.
|
||
*/
|
||
|
||
if (scalePtr->varNamePtr != NULL) {
|
||
Tcl_UntraceVar2(scalePtr->interp, Tcl_GetString(scalePtr->varNamePtr),
|
||
NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
||
ScaleVarProc, 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_FreeConfigOptions((char *) scalePtr, scalePtr->optionTable,
|
||
scalePtr->tkwin);
|
||
scalePtr->tkwin = NULL;
|
||
TkpDestroyScale(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 the interp's 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(
|
||
Tcl_Interp *interp, /* Used for error reporting. */
|
||
register TkScale *scalePtr, /* Information about widget; may or may not
|
||
* already have values for some fields. */
|
||
int objc, /* Number of valid entries in objv. */
|
||
Tcl_Obj *const objv[]) /* Argument values. */
|
||
{
|
||
Tk_SavedOptions savedOptions;
|
||
Tcl_Obj *errorResult = NULL;
|
||
int error;
|
||
double varValue;
|
||
|
||
/*
|
||
* Eliminate any existing trace on a variable monitored by the scale.
|
||
*/
|
||
|
||
if (scalePtr->varNamePtr != NULL) {
|
||
Tcl_UntraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
|
||
NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
||
ScaleVarProc, scalePtr);
|
||
}
|
||
|
||
for (error = 0; error <= 1; error++) {
|
||
if (!error) {
|
||
/*
|
||
* First pass: set options to new values.
|
||
*/
|
||
|
||
if (Tk_SetOptions(interp, (char *) scalePtr,
|
||
scalePtr->optionTable, objc, objv, scalePtr->tkwin,
|
||
&savedOptions, NULL) != TCL_OK) {
|
||
continue;
|
||
}
|
||
} else {
|
||
/*
|
||
* Second pass: restore options to old values.
|
||
*/
|
||
|
||
errorResult = Tcl_GetObjResult(interp);
|
||
Tcl_IncrRefCount(errorResult);
|
||
Tk_RestoreSavedOptions(&savedOptions);
|
||
}
|
||
|
||
/*
|
||
* If the scale is tied to the value of a variable, then set the
|
||
* scale's value from the value of the variable, if it exists and it
|
||
* holds a valid double value.
|
||
*/
|
||
|
||
if (scalePtr->varNamePtr != NULL) {
|
||
double value;
|
||
Tcl_Obj *valuePtr;
|
||
|
||
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
|
||
TCL_GLOBAL_ONLY);
|
||
if ((valuePtr != NULL) &&
|
||
(Tcl_GetDoubleFromObj(NULL, valuePtr, &value) == TCL_OK)) {
|
||
scalePtr->value = TkRoundToResolution(scalePtr, value);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Several options need special processing, such as parsing the
|
||
* orientation and creating GCs.
|
||
*/
|
||
|
||
scalePtr->fromValue = TkRoundToResolution(scalePtr,
|
||
scalePtr->fromValue);
|
||
scalePtr->toValue = TkRoundToResolution(scalePtr, scalePtr->toValue);
|
||
scalePtr->tickInterval = TkRoundToResolution(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;
|
||
}
|
||
|
||
ComputeFormat(scalePtr);
|
||
|
||
scalePtr->labelLength = scalePtr->label ? (int)strlen(scalePtr->label) : 0;
|
||
|
||
Tk_SetBackgroundFromBorder(scalePtr->tkwin, scalePtr->bgBorder);
|
||
|
||
if (scalePtr->highlightWidth < 0) {
|
||
scalePtr->highlightWidth = 0;
|
||
}
|
||
scalePtr->inset = scalePtr->highlightWidth + scalePtr->borderWidth;
|
||
break;
|
||
}
|
||
if (!error) {
|
||
Tk_FreeSavedOptions(&savedOptions);
|
||
}
|
||
|
||
/*
|
||
* 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. We
|
||
* don't set the var here because we need to make special checks for
|
||
* possibly changed varNamePtr.
|
||
*/
|
||
|
||
TkScaleSetValue(scalePtr, scalePtr->value, 0, 1);
|
||
|
||
/*
|
||
* Reestablish the variable trace, if it is needed.
|
||
*/
|
||
|
||
if (scalePtr->varNamePtr != NULL) {
|
||
Tcl_Obj *valuePtr;
|
||
|
||
/*
|
||
* Set the associated variable only when the new value differs from
|
||
* the current value, or the variable doesn't yet exist.
|
||
*/
|
||
|
||
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
|
||
TCL_GLOBAL_ONLY);
|
||
if ((valuePtr == NULL) || (Tcl_GetDoubleFromObj(NULL,
|
||
valuePtr, &varValue) != TCL_OK)) {
|
||
ScaleSetVariable(scalePtr);
|
||
} else {
|
||
char varString[TCL_DOUBLE_SPACE], scaleString[TCL_DOUBLE_SPACE];
|
||
|
||
Tcl_PrintDouble(NULL, varValue, varString);
|
||
Tcl_PrintDouble(NULL, scalePtr->value, scaleString);
|
||
if (strcmp(varString, scaleString)) {
|
||
ScaleSetVariable(scalePtr);
|
||
}
|
||
}
|
||
Tcl_TraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
|
||
NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
||
ScaleVarProc, scalePtr);
|
||
}
|
||
|
||
ScaleWorldChanged(scalePtr);
|
||
if (error) {
|
||
Tcl_SetObjResult(interp, errorResult);
|
||
Tcl_DecrRefCount(errorResult);
|
||
return TCL_ERROR;
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*---------------------------------------------------------------------------
|
||
*
|
||
* ScaleWorldChanged --
|
||
*
|
||
* This procedure is called when the world has changed in some way and
|
||
* the widget needs to recompute all its graphics contexts and determine
|
||
* its new geometry.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Scale will be relayed out and redisplayed.
|
||
*
|
||
*---------------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ScaleWorldChanged(
|
||
ClientData instanceData) /* Information about widget. */
|
||
{
|
||
XGCValues gcValues;
|
||
GC gc;
|
||
TkScale *scalePtr = instanceData;
|
||
|
||
gcValues.foreground = scalePtr->troughColorPtr->pixel;
|
||
gc = Tk_GetGC(scalePtr->tkwin, GCForeground, &gcValues);
|
||
if (scalePtr->troughGC != None) {
|
||
Tk_FreeGC(scalePtr->display, scalePtr->troughGC);
|
||
}
|
||
scalePtr->troughGC = gc;
|
||
|
||
gcValues.font = Tk_FontId(scalePtr->tkfont);
|
||
gcValues.foreground = scalePtr->textColorPtr->pixel;
|
||
gc = Tk_GetGC(scalePtr->tkwin, GCForeground | GCFont, &gcValues);
|
||
if (scalePtr->textGC != None) {
|
||
Tk_FreeGC(scalePtr->display, scalePtr->textGC);
|
||
}
|
||
scalePtr->textGC = gc;
|
||
|
||
if (scalePtr->copyGC == None) {
|
||
gcValues.graphics_exposures = False;
|
||
scalePtr->copyGC = Tk_GetGC(scalePtr->tkwin, GCGraphicsExposures,
|
||
&gcValues);
|
||
}
|
||
scalePtr->inset = scalePtr->highlightWidth + scalePtr->borderWidth;
|
||
|
||
/*
|
||
* Recompute display-related information, and let the geometry manager
|
||
* know how much space is needed now.
|
||
*/
|
||
|
||
ComputeScaleGeometry(scalePtr);
|
||
|
||
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* 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(
|
||
TkScale *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 = (int) 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 > TCL_MAX_PREC) {
|
||
numDigits = 0;
|
||
}
|
||
if (numDigits <= 0) {
|
||
if (scalePtr->resolution > 0) {
|
||
/*
|
||
* A resolution was specified for the scale, so just use it.
|
||
*/
|
||
|
||
leastSigDigit = (int) 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 = (int) 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(
|
||
register TkScale *scalePtr) /* Information about widget. */
|
||
{
|
||
char valueString[TCL_DOUBLE_SPACE];
|
||
int tmp, valuePixels, x, y, extraSpace;
|
||
Tk_FontMetrics fm;
|
||
|
||
Tk_GetFontMetrics(scalePtr->tkfont, &fm);
|
||
scalePtr->fontHeight = fm.linespace + SPACING;
|
||
|
||
/*
|
||
* 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->orient == ORIENT_HORIZONTAL) {
|
||
y = scalePtr->inset;
|
||
extraSpace = 0;
|
||
if (scalePtr->labelLength != 0) {
|
||
scalePtr->horizLabelY = y + SPACING;
|
||
y += scalePtr->fontHeight;
|
||
extraSpace = SPACING;
|
||
}
|
||
if (scalePtr->showValue) {
|
||
scalePtr->horizValueY = y + SPACING;
|
||
y += scalePtr->fontHeight;
|
||
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 += scalePtr->fontHeight + 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.
|
||
*/
|
||
|
||
if (snprintf(valueString, TCL_DOUBLE_SPACE, scalePtr->format,
|
||
scalePtr->fromValue) < 0) {
|
||
valueString[TCL_DOUBLE_SPACE - 1] = '\0';
|
||
}
|
||
valuePixels = Tk_TextWidth(scalePtr->tkfont, valueString, -1);
|
||
|
||
if (snprintf(valueString, TCL_DOUBLE_SPACE, scalePtr->format,
|
||
scalePtr->toValue) < 0) {
|
||
valueString[TCL_DOUBLE_SPACE - 1] = '\0';
|
||
}
|
||
tmp = Tk_TextWidth(scalePtr->tkfont, valueString, -1);
|
||
if (valuePixels < tmp) {
|
||
valuePixels = tmp;
|
||
}
|
||
|
||
/*
|
||
* 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
|
||
+ fm.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 {
|
||
scalePtr->vertLabelX = x + fm.ascent/2;
|
||
x = scalePtr->vertLabelX + fm.ascent/2
|
||
+ Tk_TextWidth(scalePtr->tkfont, scalePtr->label,
|
||
scalePtr->labelLength);
|
||
}
|
||
Tk_GeometryRequest(scalePtr->tkwin, x + scalePtr->inset,
|
||
scalePtr->length + 2*scalePtr->inset);
|
||
Tk_SetInternalBorder(scalePtr->tkwin, scalePtr->inset);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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 clientData, /* Information about window. */
|
||
XEvent *eventPtr) /* Information about event. */
|
||
{
|
||
TkScale *scalePtr = clientData;
|
||
|
||
if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
|
||
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
||
} else if (eventPtr->type == DestroyNotify) {
|
||
DestroyScale(clientData);
|
||
} else if (eventPtr->type == ConfigureNotify) {
|
||
ComputeScaleGeometry(scalePtr);
|
||
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
||
} else if (eventPtr->type == FocusIn) {
|
||
if (eventPtr->xfocus.detail != NotifyInferior) {
|
||
scalePtr->flags |= GOT_FOCUS;
|
||
if (scalePtr->highlightWidth > 0) {
|
||
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
||
}
|
||
}
|
||
} else if (eventPtr->type == FocusOut) {
|
||
if (eventPtr->xfocus.detail != NotifyInferior) {
|
||
scalePtr->flags &= ~GOT_FOCUS;
|
||
if (scalePtr->highlightWidth > 0) {
|
||
TkEventuallyRedrawScale(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) /* Pointer to widget record for widget. */
|
||
{
|
||
TkScale *scalePtr = 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 (!(scalePtr->flags & SCALE_DELETED)) {
|
||
scalePtr->flags |= SCALE_DELETED;
|
||
Tk_DestroyWindow(tkwin);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkEventuallyRedrawScale --
|
||
*
|
||
* 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.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkEventuallyRedrawScale(
|
||
register TkScale *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_PENDING)) {
|
||
scalePtr->flags |= REDRAW_PENDING;
|
||
Tcl_DoWhenIdle(TkpDisplayScale, scalePtr);
|
||
}
|
||
scalePtr->flags |= what;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkRoundToResolution --
|
||
*
|
||
* 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.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
double
|
||
TkRoundToResolution(
|
||
TkScale *scalePtr, /* Information about scale widget. */
|
||
double value) /* Value to round. */
|
||
{
|
||
double rem, rounded, tick;
|
||
|
||
if (scalePtr->resolution <= 0) {
|
||
return value;
|
||
}
|
||
tick = floor(value/scalePtr->resolution);
|
||
rounded = scalePtr->resolution * tick;
|
||
rem = value - rounded;
|
||
if (rem < 0) {
|
||
if (rem <= -scalePtr->resolution/2) {
|
||
rounded = (tick - 1.0) * scalePtr->resolution;
|
||
}
|
||
} else {
|
||
if (rem >= scalePtr->resolution/2) {
|
||
rounded = (tick + 1.0) * scalePtr->resolution;
|
||
}
|
||
}
|
||
return rounded;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* 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 clientData, /* Information about button. */
|
||
Tcl_Interp *interp, /* Interpreter containing variable. */
|
||
const char *name1, /* Name of variable. */
|
||
const char *name2, /* Second part of variable name. */
|
||
int flags) /* Information about what happened. */
|
||
{
|
||
register TkScale *scalePtr = clientData;
|
||
const char *resultStr;
|
||
double value;
|
||
Tcl_Obj *valuePtr;
|
||
int result;
|
||
|
||
/*
|
||
* 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_TraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
|
||
NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
||
ScaleVarProc, clientData);
|
||
scalePtr->flags |= NEVER_SET;
|
||
TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
/*
|
||
* If we came here because we updated the variable (in TkScaleSetValue),
|
||
* then ignore the trace. Otherwise update the scale with the value of the
|
||
* variable.
|
||
*/
|
||
|
||
if (scalePtr->flags & SETTING_VAR) {
|
||
return NULL;
|
||
}
|
||
resultStr = NULL;
|
||
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
|
||
TCL_GLOBAL_ONLY);
|
||
result = Tcl_GetDoubleFromObj(interp, valuePtr, &value);
|
||
if (result != TCL_OK) {
|
||
resultStr = "can't assign non-numeric value to scale variable";
|
||
ScaleSetVariable(scalePtr);
|
||
} else {
|
||
scalePtr->value = TkRoundToResolution(scalePtr, value);
|
||
|
||
/*
|
||
* This code is a bit tricky because it sets the scale's value before
|
||
* calling TkScaleSetValue. This way, TkScaleSetValue 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.
|
||
*/
|
||
|
||
TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
|
||
}
|
||
TkEventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
|
||
|
||
return (char *) resultStr;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkScaleSetValue --
|
||
*
|
||
* 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.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkScaleSetValue(
|
||
register TkScale *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. */
|
||
{
|
||
value = TkRoundToResolution(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;
|
||
|
||
/*
|
||
* Schedule command callback invocation only if there is such a command
|
||
* already registered, otherwise the callback would trigger later when
|
||
* configuring the widget -command option even if the value did not change.
|
||
*/
|
||
|
||
if ((invokeCommand) && (scalePtr->command != NULL)) {
|
||
scalePtr->flags |= INVOKE_COMMAND;
|
||
}
|
||
TkEventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
|
||
|
||
if (setVar && scalePtr->varNamePtr) {
|
||
ScaleSetVariable(scalePtr);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScaleSetVariable --
|
||
*
|
||
* This procedure sets the variable associated with a scale, if any.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Other write traces on the variable will trigger.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ScaleSetVariable(
|
||
register TkScale *scalePtr) /* Info about widget. */
|
||
{
|
||
if (scalePtr->varNamePtr != NULL) {
|
||
char string[TCL_DOUBLE_SPACE];
|
||
|
||
if (snprintf(string, TCL_DOUBLE_SPACE, scalePtr->format,
|
||
scalePtr->value) < 0) {
|
||
string[TCL_DOUBLE_SPACE - 1] = '\0';
|
||
}
|
||
scalePtr->flags |= SETTING_VAR;
|
||
Tcl_ObjSetVar2(scalePtr->interp, scalePtr->varNamePtr, NULL,
|
||
Tcl_NewStringObj(string, -1), TCL_GLOBAL_ONLY);
|
||
scalePtr->flags &= ~SETTING_VAR;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkScalePixelToValue --
|
||
*
|
||
* 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.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
double
|
||
TkScalePixelToValue(
|
||
register TkScale *scalePtr, /* Information about widget. */
|
||
int x, int y) /* Coordinates of point within window. */
|
||
{
|
||
double value, pixelRange;
|
||
|
||
if (scalePtr->orient == ORIENT_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 TkRoundToResolution(scalePtr, value);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkScaleValueToPixel --
|
||
*
|
||
* 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.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkScaleValueToPixel(
|
||
register TkScale *scalePtr, /* Information about widget. */
|
||
double value) /* Reading of the widget. */
|
||
{
|
||
int y, pixelRange;
|
||
double valueRange;
|
||
|
||
valueRange = scalePtr->toValue - scalePtr->fromValue;
|
||
pixelRange = ((scalePtr->orient == ORIENT_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;
|
||
}
|
||
|
||
/*
|
||
* Local Variables:
|
||
* mode: c
|
||
* c-basic-offset: 4
|
||
* fill-column: 78
|
||
* End:
|
||
*/
|