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dashley |
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/* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tk_base/tkscale.c,v 1.1.1.1 2001/06/13 05:07:45 dtashley Exp $ */
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/*
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* tkScale.c --
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*
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* This module implements a scale widgets for the Tk toolkit.
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* A scale displays a slider that can be adjusted to change a
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* value; it also displays numeric labels and a textual label,
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* if desired.
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*
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* The modifications to use floating-point values are based on
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* an implementation by Paul Mackerras. The -variable option
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* is due to Henning Schulzrinne. All of these are used with
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* permission.
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*
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* 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
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tkscale.c,v 1.1.1.1 2001/06/13 05:07:45 dtashley Exp $
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*/
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#include "tkPort.h"
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#include "default.h"
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#include "tkInt.h"
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#include "tclMath.h"
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#include "tkScale.h"
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/*
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* The following table defines the legal values for the -orient option.
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* It is used together with the "enum orient" declaration in tkScale.h.
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*/
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static char *orientStrings[] = {
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"horizontal", "vertical", (char *) NULL
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};
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/*
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* The following table defines the legal values for the -state option.
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* It is used together with the "enum state" declaration in tkScale.h.
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*/
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static char *stateStrings[] = {
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"active", "disabled", "normal", (char *) NULL
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};
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static Tk_OptionSpec optionSpecs[] = {
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{TK_OPTION_BORDER, "-activebackground", "activeBackground", "Foreground",
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DEF_SCALE_ACTIVE_BG_COLOR, -1, Tk_Offset(TkScale, activeBorder),
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0, (ClientData) 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, (ClientData) 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),
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0, 0, 0},
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{TK_OPTION_SYNONYM, "-bd", (char *) NULL, (char *) NULL,
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(char *) NULL, 0, -1, 0, (ClientData) "-borderwidth", 0},
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{TK_OPTION_SYNONYM, "-bg", (char *) NULL, (char *) NULL,
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(char *) NULL, 0, -1, 0, (ClientData) "-background", 0},
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{TK_OPTION_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
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DEF_SCALE_BORDER_WIDTH, -1, Tk_Offset(TkScale, borderWidth),
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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},
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{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", (char *) NULL,
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(char *) NULL, 0, -1, 0, (ClientData) "-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},
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{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},
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{TK_OPTION_BORDER, "-highlightbackground", "highlightBackground",
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"HighlightBackground", DEF_SCALE_HIGHLIGHT_BG_COLOR,
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-1, Tk_Offset(TkScale, highlightBorder),
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0, (ClientData) 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),
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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},
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{TK_OPTION_STRING_TABLE, "-orient", "orient", "Orient",
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DEF_SCALE_ORIENT, -1, Tk_Offset(TkScale, orient),
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0, (ClientData) 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),
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0, 0, 0},
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{TK_OPTION_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",
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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",
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DEF_SCALE_RESOLUTION, -1, Tk_Offset(TkScale, resolution),
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0, 0, 0},
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{TK_OPTION_BOOLEAN, "-showvalue", "showValue", "ShowValue",
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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",
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DEF_SCALE_SLIDER_LENGTH, -1, Tk_Offset(TkScale, sliderLength),
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0, 0, 0},
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{TK_OPTION_RELIEF, "-sliderrelief", "sliderRelief", "SliderRelief",
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DEF_SCALE_SLIDER_RELIEF, -1, Tk_Offset(TkScale, sliderRelief),
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0, 0, 0},
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{TK_OPTION_STRING_TABLE, "-state", "state", "State",
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DEF_SCALE_STATE, -1, Tk_Offset(TkScale, state),
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0, (ClientData) stateStrings, 0},
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{TK_OPTION_STRING, "-takefocus", "takeFocus", "TakeFocus",
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DEF_SCALE_TAKE_FOCUS, Tk_Offset(TkScale, takeFocusPtr), -1,
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TK_OPTION_NULL_OK, 0, 0},
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{TK_OPTION_DOUBLE, "-tickinterval", "tickInterval", "TickInterval",
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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, (ClientData) 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, (char *) NULL, (char *) NULL, (char *) NULL,
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(char *) 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
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* indexes into the string tables into a single enumerated type used
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* to dispatch the scale widget command.
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*/
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static char *commandNames[] = {
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"cget", "configure", "coords", "get", "identify", "set", (char *) 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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* Forward declarations for procedures defined later in this file:
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*/
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static void ComputeFormat _ANSI_ARGS_((TkScale *scalePtr));
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static void ComputeScaleGeometry _ANSI_ARGS_((TkScale *scalePtr));
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static int ConfigureScale _ANSI_ARGS_((Tcl_Interp *interp,
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TkScale *scalePtr, int objc,
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Tcl_Obj *CONST objv[]));
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static void DestroyScale _ANSI_ARGS_((char *memPtr));
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static void ScaleCmdDeletedProc _ANSI_ARGS_((
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ClientData clientData));
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static void ScaleEventProc _ANSI_ARGS_((ClientData clientData,
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XEvent *eventPtr));
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static char * ScaleVarProc _ANSI_ARGS_((ClientData clientData,
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Tcl_Interp *interp, char *name1, char *name2,
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int flags));
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static int ScaleWidgetObjCmd _ANSI_ARGS_((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 _ANSI_ARGS_((
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ClientData instanceData));
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static void ScaleSetVariable _ANSI_ARGS_((TkScale *scalePtr));
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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.
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*/
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static TkClassProcs scaleClass = {
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NULL, /* createProc. */
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ScaleWorldChanged, /* geometryProc. */
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NULL /* modalProc. */
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};
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/*
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*--------------------------------------------------------------
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*
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* Tk_ScaleObjCmd --
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*
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* This procedure is invoked to process the "scale" Tcl
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* command. See the user documentation for details on what
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* it does.
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*
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* Results:
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* A standard Tcl result.
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*
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* Side effects:
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* See the user documentation.
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*
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*--------------------------------------------------------------
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*/
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int
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Tk_ScaleObjCmd(clientData, interp, objc, objv)
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ClientData clientData; /* Either NULL or pointer to option table. */
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Tcl_Interp *interp; /* Current interpreter. */
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int objc; /* Number of arguments. */
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Tcl_Obj *CONST objv[]; /* Argument values. */
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{
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register TkScale *scalePtr;
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Tk_OptionTable optionTable;
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Tk_Window tkwin;
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optionTable = (Tk_OptionTable) clientData;
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if (optionTable == NULL) {
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Tcl_CmdInfo info;
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char *name;
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/*
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* We haven't created the option table for this widget class
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* yet. Do it now and save the table as the clientData for
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* the command, so we'll have access to it in future
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* invocations of the command.
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*/
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optionTable = Tk_CreateOptionTable(interp, optionSpecs);
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name = Tcl_GetString(objv[0]);
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Tcl_GetCommandInfo(interp, name, &info);
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info.objClientData = (ClientData) optionTable;
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Tcl_SetCommandInfo(interp, name, &info);
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}
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if (objc < 2) {
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Tcl_WrongNumArgs(interp, 1, objv, "pathName ?options?");
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return TCL_ERROR;
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}
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tkwin = Tk_CreateWindowFromPath(interp, Tk_MainWindow(interp),
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Tcl_GetString(objv[1]), (char *) NULL);
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if (tkwin == NULL) {
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return TCL_ERROR;
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}
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Tk_SetClass(tkwin, "Scale");
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scalePtr = TkpCreateScale(tkwin);
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/*
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* Initialize fields that won't be initialized by ConfigureScale,
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* or which ConfigureScale expects to have reasonable values
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* (e.g. resource pointers).
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*/
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scalePtr->tkwin = tkwin;
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scalePtr->display = Tk_Display(tkwin);
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scalePtr->interp = interp;
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scalePtr->widgetCmd = Tcl_CreateObjCommand(interp,
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Tk_PathName(scalePtr->tkwin), ScaleWidgetObjCmd,
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(ClientData) scalePtr, ScaleCmdDeletedProc);
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scalePtr->optionTable = optionTable;
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272 |
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scalePtr->orient = ORIENT_VERTICAL;
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273 |
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scalePtr->width = 0;
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scalePtr->length = 0;
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275 |
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scalePtr->value = 0.0;
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scalePtr->varNamePtr = NULL;
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scalePtr->fromValue = 0.0;
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278 |
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scalePtr->toValue = 0.0;
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279 |
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scalePtr->tickInterval = 0.0;
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280 |
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scalePtr->resolution = 1.0;
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281 |
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scalePtr->digits = 0;
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282 |
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scalePtr->bigIncrement = 0.0;
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283 |
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scalePtr->command = NULL;
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284 |
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scalePtr->repeatDelay = 0;
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285 |
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scalePtr->repeatInterval = 0;
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286 |
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scalePtr->label = NULL;
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287 |
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scalePtr->labelLength = 0;
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288 |
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scalePtr->state = STATE_NORMAL;
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scalePtr->borderWidth = 0;
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scalePtr->bgBorder = NULL;
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scalePtr->activeBorder = NULL;
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292 |
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scalePtr->sliderRelief = TK_RELIEF_RAISED;
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293 |
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scalePtr->troughColorPtr = NULL;
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scalePtr->troughGC = None;
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295 |
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scalePtr->copyGC = None;
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296 |
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scalePtr->tkfont = NULL;
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297 |
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scalePtr->textColorPtr = NULL;
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scalePtr->textGC = None;
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scalePtr->relief = TK_RELIEF_FLAT;
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scalePtr->highlightWidth = 0;
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scalePtr->highlightBorder = NULL;
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scalePtr->highlightColorPtr = NULL;
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scalePtr->inset = 0;
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304 |
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scalePtr->sliderLength = 0;
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305 |
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scalePtr->showValue = 0;
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306 |
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scalePtr->horizLabelY = 0;
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307 |
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scalePtr->horizValueY = 0;
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308 |
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scalePtr->horizTroughY = 0;
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309 |
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scalePtr->horizTickY = 0;
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310 |
|
|
scalePtr->vertTickRightX = 0;
|
311 |
|
|
scalePtr->vertValueRightX = 0;
|
312 |
|
|
scalePtr->vertTroughX = 0;
|
313 |
|
|
scalePtr->vertLabelX = 0;
|
314 |
|
|
scalePtr->fontHeight = 0;
|
315 |
|
|
scalePtr->cursor = None;
|
316 |
|
|
scalePtr->takeFocusPtr = NULL;
|
317 |
|
|
scalePtr->flags = NEVER_SET;
|
318 |
|
|
|
319 |
|
|
TkSetClassProcs(scalePtr->tkwin, &scaleClass, (ClientData) scalePtr);
|
320 |
|
|
Tk_CreateEventHandler(scalePtr->tkwin,
|
321 |
|
|
ExposureMask|StructureNotifyMask|FocusChangeMask,
|
322 |
|
|
ScaleEventProc, (ClientData) scalePtr);
|
323 |
|
|
|
324 |
|
|
if ((Tk_InitOptions(interp, (char *) scalePtr, optionTable, tkwin)
|
325 |
|
|
!= TCL_OK) ||
|
326 |
|
|
(ConfigureScale(interp, scalePtr, objc - 2, objv + 2) != TCL_OK)) {
|
327 |
|
|
Tk_DestroyWindow(scalePtr->tkwin);
|
328 |
|
|
return TCL_ERROR;
|
329 |
|
|
}
|
330 |
|
|
|
331 |
|
|
Tcl_SetResult(interp, Tk_PathName(scalePtr->tkwin), TCL_STATIC);
|
332 |
|
|
return TCL_OK;
|
333 |
|
|
}
|
334 |
|
|
|
335 |
|
|
/*
|
336 |
|
|
*--------------------------------------------------------------
|
337 |
|
|
*
|
338 |
|
|
* ScaleWidgetObjCmd --
|
339 |
|
|
*
|
340 |
|
|
* This procedure is invoked to process the Tcl command
|
341 |
|
|
* that corresponds to a widget managed by this module.
|
342 |
|
|
* See the user documentation for details on what it does.
|
343 |
|
|
*
|
344 |
|
|
* Results:
|
345 |
|
|
* A standard Tcl result.
|
346 |
|
|
*
|
347 |
|
|
* Side effects:
|
348 |
|
|
* See the user documentation.
|
349 |
|
|
*
|
350 |
|
|
*--------------------------------------------------------------
|
351 |
|
|
*/
|
352 |
|
|
|
353 |
|
|
static int
|
354 |
|
|
ScaleWidgetObjCmd(clientData, interp, objc, objv)
|
355 |
|
|
ClientData clientData; /* Information about scale
|
356 |
|
|
* widget. */
|
357 |
|
|
Tcl_Interp *interp; /* Current interpreter. */
|
358 |
|
|
int objc; /* Number of arguments. */
|
359 |
|
|
Tcl_Obj *CONST objv[]; /* Argument strings. */
|
360 |
|
|
{
|
361 |
|
|
TkScale *scalePtr = (TkScale *) clientData;
|
362 |
|
|
Tcl_Obj *objPtr;
|
363 |
|
|
int index, result;
|
364 |
|
|
|
365 |
|
|
if (objc < 2) {
|
366 |
|
|
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
|
367 |
|
|
return TCL_ERROR;
|
368 |
|
|
}
|
369 |
|
|
result = Tcl_GetIndexFromObj(interp, objv[1], commandNames,
|
370 |
|
|
"option", 0, &index);
|
371 |
|
|
if (result != TCL_OK) {
|
372 |
|
|
return result;
|
373 |
|
|
}
|
374 |
|
|
Tcl_Preserve((ClientData) scalePtr);
|
375 |
|
|
|
376 |
|
|
switch (index) {
|
377 |
|
|
case COMMAND_CGET: {
|
378 |
|
|
if (objc != 3) {
|
379 |
|
|
Tcl_WrongNumArgs(interp, 1, objv, "cget option");
|
380 |
|
|
goto error;
|
381 |
|
|
}
|
382 |
|
|
objPtr = Tk_GetOptionValue(interp, (char *) scalePtr,
|
383 |
|
|
scalePtr->optionTable, objv[2], scalePtr->tkwin);
|
384 |
|
|
if (objPtr == NULL) {
|
385 |
|
|
goto error;
|
386 |
|
|
} else {
|
387 |
|
|
Tcl_SetObjResult(interp, objPtr);
|
388 |
|
|
}
|
389 |
|
|
break;
|
390 |
|
|
}
|
391 |
|
|
case COMMAND_CONFIGURE: {
|
392 |
|
|
if (objc <= 3) {
|
393 |
|
|
objPtr = Tk_GetOptionInfo(interp, (char *) scalePtr,
|
394 |
|
|
scalePtr->optionTable,
|
395 |
|
|
(objc == 3) ? objv[2] : (Tcl_Obj *) NULL,
|
396 |
|
|
scalePtr->tkwin);
|
397 |
|
|
if (objPtr == NULL) {
|
398 |
|
|
goto error;
|
399 |
|
|
} else {
|
400 |
|
|
Tcl_SetObjResult(interp, objPtr);
|
401 |
|
|
}
|
402 |
|
|
} else {
|
403 |
|
|
result = ConfigureScale(interp, scalePtr, objc-2, objv+2);
|
404 |
|
|
}
|
405 |
|
|
break;
|
406 |
|
|
}
|
407 |
|
|
case COMMAND_COORDS: {
|
408 |
|
|
int x, y ;
|
409 |
|
|
double value;
|
410 |
|
|
char buf[TCL_INTEGER_SPACE * 2];
|
411 |
|
|
|
412 |
|
|
if ((objc != 2) && (objc != 3)) {
|
413 |
|
|
Tcl_WrongNumArgs(interp, 1, objv, "coords ?value?");
|
414 |
|
|
goto error;
|
415 |
|
|
}
|
416 |
|
|
if (objc == 3) {
|
417 |
|
|
if (Tcl_GetDoubleFromObj(interp, objv[2], &value)
|
418 |
|
|
!= TCL_OK) {
|
419 |
|
|
goto error;
|
420 |
|
|
}
|
421 |
|
|
} else {
|
422 |
|
|
value = scalePtr->value;
|
423 |
|
|
}
|
424 |
|
|
if (scalePtr->orient == ORIENT_VERTICAL) {
|
425 |
|
|
x = scalePtr->vertTroughX + scalePtr->width/2
|
426 |
|
|
+ scalePtr->borderWidth;
|
427 |
|
|
y = TkScaleValueToPixel(scalePtr, value);
|
428 |
|
|
} else {
|
429 |
|
|
x = TkScaleValueToPixel(scalePtr, value);
|
430 |
|
|
y = scalePtr->horizTroughY + scalePtr->width/2
|
431 |
|
|
+ scalePtr->borderWidth;
|
432 |
|
|
}
|
433 |
|
|
sprintf(buf, "%d %d", x, y);
|
434 |
|
|
Tcl_SetResult(interp, buf, TCL_VOLATILE);
|
435 |
|
|
break;
|
436 |
|
|
}
|
437 |
|
|
case COMMAND_GET: {
|
438 |
|
|
double value;
|
439 |
|
|
int x, y;
|
440 |
|
|
char buf[TCL_DOUBLE_SPACE];
|
441 |
|
|
|
442 |
|
|
if ((objc != 2) && (objc != 4)) {
|
443 |
|
|
Tcl_WrongNumArgs(interp, 1, objv, "get ?x y?");
|
444 |
|
|
goto error;
|
445 |
|
|
}
|
446 |
|
|
if (objc == 2) {
|
447 |
|
|
value = scalePtr->value;
|
448 |
|
|
} else {
|
449 |
|
|
if ((Tcl_GetIntFromObj(interp, objv[2], &x) != TCL_OK)
|
450 |
|
|
|| (Tcl_GetIntFromObj(interp, objv[3], &y)
|
451 |
|
|
!= TCL_OK)) {
|
452 |
|
|
goto error;
|
453 |
|
|
}
|
454 |
|
|
value = TkScalePixelToValue(scalePtr, x, y);
|
455 |
|
|
}
|
456 |
|
|
sprintf(buf, scalePtr->format, value);
|
457 |
|
|
Tcl_SetResult(interp, buf, TCL_VOLATILE);
|
458 |
|
|
break;
|
459 |
|
|
}
|
460 |
|
|
case COMMAND_IDENTIFY: {
|
461 |
|
|
int x, y, thing;
|
462 |
|
|
|
463 |
|
|
if (objc != 4) {
|
464 |
|
|
Tcl_WrongNumArgs(interp, 1, objv, "identify x y");
|
465 |
|
|
goto error;
|
466 |
|
|
}
|
467 |
|
|
if ((Tcl_GetIntFromObj(interp, objv[2], &x) != TCL_OK)
|
468 |
|
|
|| (Tcl_GetIntFromObj(interp, objv[3], &y) != TCL_OK)) {
|
469 |
|
|
goto error;
|
470 |
|
|
}
|
471 |
|
|
thing = TkpScaleElement(scalePtr, x,y);
|
472 |
|
|
switch (thing) {
|
473 |
|
|
case TROUGH1:
|
474 |
|
|
Tcl_SetResult(interp, "trough1", TCL_STATIC);
|
475 |
|
|
break;
|
476 |
|
|
case SLIDER:
|
477 |
|
|
Tcl_SetResult(interp, "slider", TCL_STATIC);
|
478 |
|
|
break;
|
479 |
|
|
case TROUGH2:
|
480 |
|
|
Tcl_SetResult(interp, "trough2", TCL_STATIC);
|
481 |
|
|
break;
|
482 |
|
|
}
|
483 |
|
|
break;
|
484 |
|
|
}
|
485 |
|
|
case COMMAND_SET: {
|
486 |
|
|
double value;
|
487 |
|
|
|
488 |
|
|
if (objc != 3) {
|
489 |
|
|
Tcl_WrongNumArgs(interp, 1, objv, "set value");
|
490 |
|
|
goto error;
|
491 |
|
|
}
|
492 |
|
|
if (Tcl_GetDoubleFromObj(interp, objv[2], &value) != TCL_OK) {
|
493 |
|
|
goto error;
|
494 |
|
|
}
|
495 |
|
|
if (scalePtr->state != STATE_DISABLED) {
|
496 |
|
|
TkScaleSetValue(scalePtr, value, 1, 1);
|
497 |
|
|
}
|
498 |
|
|
break;
|
499 |
|
|
}
|
500 |
|
|
}
|
501 |
|
|
Tcl_Release((ClientData) scalePtr);
|
502 |
|
|
return result;
|
503 |
|
|
|
504 |
|
|
error:
|
505 |
|
|
Tcl_Release((ClientData) scalePtr);
|
506 |
|
|
return TCL_ERROR;
|
507 |
|
|
}
|
508 |
|
|
|
509 |
|
|
/*
|
510 |
|
|
*----------------------------------------------------------------------
|
511 |
|
|
*
|
512 |
|
|
* DestroyScale --
|
513 |
|
|
*
|
514 |
|
|
* This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
|
515 |
|
|
* to clean up the internal structure of a button at a safe time
|
516 |
|
|
* (when no-one is using it anymore).
|
517 |
|
|
*
|
518 |
|
|
* Results:
|
519 |
|
|
* None.
|
520 |
|
|
*
|
521 |
|
|
* Side effects:
|
522 |
|
|
* Everything associated with the scale is freed up.
|
523 |
|
|
*
|
524 |
|
|
*----------------------------------------------------------------------
|
525 |
|
|
*/
|
526 |
|
|
|
527 |
|
|
static void
|
528 |
|
|
DestroyScale(memPtr)
|
529 |
|
|
char *memPtr; /* Info about scale widget. */
|
530 |
|
|
{
|
531 |
|
|
register TkScale *scalePtr = (TkScale *) memPtr;
|
532 |
|
|
|
533 |
|
|
scalePtr->flags |= SCALE_DELETED;
|
534 |
|
|
|
535 |
|
|
Tcl_DeleteCommandFromToken(scalePtr->interp, scalePtr->widgetCmd);
|
536 |
|
|
if (scalePtr->flags & REDRAW_PENDING) {
|
537 |
|
|
Tcl_CancelIdleCall(TkpDisplayScale, (ClientData) scalePtr);
|
538 |
|
|
}
|
539 |
|
|
|
540 |
|
|
/*
|
541 |
|
|
* Free up all the stuff that requires special handling, then
|
542 |
|
|
* let Tk_FreeOptions handle all the standard option-related
|
543 |
|
|
* stuff.
|
544 |
|
|
*/
|
545 |
|
|
|
546 |
|
|
if (scalePtr->varNamePtr != NULL) {
|
547 |
|
|
Tcl_UntraceVar(scalePtr->interp, Tcl_GetString(scalePtr->varNamePtr),
|
548 |
|
|
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
549 |
|
|
ScaleVarProc, (ClientData) scalePtr);
|
550 |
|
|
}
|
551 |
|
|
if (scalePtr->troughGC != None) {
|
552 |
|
|
Tk_FreeGC(scalePtr->display, scalePtr->troughGC);
|
553 |
|
|
}
|
554 |
|
|
if (scalePtr->copyGC != None) {
|
555 |
|
|
Tk_FreeGC(scalePtr->display, scalePtr->copyGC);
|
556 |
|
|
}
|
557 |
|
|
if (scalePtr->textGC != None) {
|
558 |
|
|
Tk_FreeGC(scalePtr->display, scalePtr->textGC);
|
559 |
|
|
}
|
560 |
|
|
Tk_FreeConfigOptions((char *) scalePtr, scalePtr->optionTable,
|
561 |
|
|
scalePtr->tkwin);
|
562 |
|
|
scalePtr->tkwin = NULL;
|
563 |
|
|
TkpDestroyScale(scalePtr);
|
564 |
|
|
}
|
565 |
|
|
|
566 |
|
|
/*
|
567 |
|
|
*----------------------------------------------------------------------
|
568 |
|
|
*
|
569 |
|
|
* ConfigureScale --
|
570 |
|
|
*
|
571 |
|
|
* This procedure is called to process an argv/argc list, plus
|
572 |
|
|
* the Tk option database, in order to configure (or
|
573 |
|
|
* reconfigure) a scale widget.
|
574 |
|
|
*
|
575 |
|
|
* Results:
|
576 |
|
|
* The return value is a standard Tcl result. If TCL_ERROR is
|
577 |
|
|
* returned, then the interp's result contains an error message.
|
578 |
|
|
*
|
579 |
|
|
* Side effects:
|
580 |
|
|
* Configuration information, such as colors, border width,
|
581 |
|
|
* etc. get set for scalePtr; old resources get freed,
|
582 |
|
|
* if there were any.
|
583 |
|
|
*
|
584 |
|
|
*----------------------------------------------------------------------
|
585 |
|
|
*/
|
586 |
|
|
|
587 |
|
|
static int
|
588 |
|
|
ConfigureScale(interp, scalePtr, objc, objv)
|
589 |
|
|
Tcl_Interp *interp; /* Used for error reporting. */
|
590 |
|
|
register TkScale *scalePtr; /* Information about widget; may or may
|
591 |
|
|
* not already have values for some fields. */
|
592 |
|
|
int objc; /* Number of valid entries in objv. */
|
593 |
|
|
Tcl_Obj *CONST objv[]; /* Argument values. */
|
594 |
|
|
{
|
595 |
|
|
Tk_SavedOptions savedOptions;
|
596 |
|
|
Tcl_Obj *errorResult = NULL;
|
597 |
|
|
int error;
|
598 |
|
|
double oldValue = scalePtr->value;
|
599 |
|
|
|
600 |
|
|
/*
|
601 |
|
|
* Eliminate any existing trace on a variable monitored by the scale.
|
602 |
|
|
*/
|
603 |
|
|
|
604 |
|
|
if (scalePtr->varNamePtr != NULL) {
|
605 |
|
|
Tcl_UntraceVar(interp, Tcl_GetString(scalePtr->varNamePtr),
|
606 |
|
|
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
607 |
|
|
ScaleVarProc, (ClientData) scalePtr);
|
608 |
|
|
}
|
609 |
|
|
|
610 |
|
|
for (error = 0; error <= 1; error++) {
|
611 |
|
|
if (!error) {
|
612 |
|
|
/*
|
613 |
|
|
* First pass: set options to new values.
|
614 |
|
|
*/
|
615 |
|
|
|
616 |
|
|
if (Tk_SetOptions(interp, (char *) scalePtr,
|
617 |
|
|
scalePtr->optionTable, objc, objv,
|
618 |
|
|
scalePtr->tkwin, &savedOptions, (int *) NULL) != TCL_OK) {
|
619 |
|
|
continue;
|
620 |
|
|
}
|
621 |
|
|
} else {
|
622 |
|
|
/*
|
623 |
|
|
* Second pass: restore options to old values.
|
624 |
|
|
*/
|
625 |
|
|
|
626 |
|
|
errorResult = Tcl_GetObjResult(interp);
|
627 |
|
|
Tcl_IncrRefCount(errorResult);
|
628 |
|
|
Tk_RestoreSavedOptions(&savedOptions);
|
629 |
|
|
}
|
630 |
|
|
|
631 |
|
|
/*
|
632 |
|
|
* If the scale is tied to the value of a variable, then set
|
633 |
|
|
* the scale's value from the value of the variable, if it exists
|
634 |
|
|
* and it holds a valid double value.
|
635 |
|
|
*/
|
636 |
|
|
|
637 |
|
|
if (scalePtr->varNamePtr != NULL) {
|
638 |
|
|
double value;
|
639 |
|
|
Tcl_Obj *valuePtr;
|
640 |
|
|
|
641 |
|
|
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
|
642 |
|
|
TCL_GLOBAL_ONLY);
|
643 |
|
|
if ((valuePtr != NULL) &&
|
644 |
|
|
(Tcl_GetDoubleFromObj(NULL, valuePtr, &value) == TCL_OK)) {
|
645 |
|
|
scalePtr->value = TkRoundToResolution(scalePtr, value);
|
646 |
|
|
}
|
647 |
|
|
}
|
648 |
|
|
|
649 |
|
|
/*
|
650 |
|
|
* Several options need special processing, such as parsing the
|
651 |
|
|
* orientation and creating GCs.
|
652 |
|
|
*/
|
653 |
|
|
|
654 |
|
|
scalePtr->fromValue = TkRoundToResolution(scalePtr,
|
655 |
|
|
scalePtr->fromValue);
|
656 |
|
|
scalePtr->toValue = TkRoundToResolution(scalePtr, scalePtr->toValue);
|
657 |
|
|
scalePtr->tickInterval = TkRoundToResolution(scalePtr,
|
658 |
|
|
scalePtr->tickInterval);
|
659 |
|
|
|
660 |
|
|
/*
|
661 |
|
|
* Make sure that the tick interval has the right sign so that
|
662 |
|
|
* addition moves from fromValue to toValue.
|
663 |
|
|
*/
|
664 |
|
|
|
665 |
|
|
if ((scalePtr->tickInterval < 0)
|
666 |
|
|
^ ((scalePtr->toValue - scalePtr->fromValue) < 0)) {
|
667 |
|
|
scalePtr->tickInterval = -scalePtr->tickInterval;
|
668 |
|
|
}
|
669 |
|
|
|
670 |
|
|
ComputeFormat(scalePtr);
|
671 |
|
|
|
672 |
|
|
scalePtr->labelLength = scalePtr->label ? strlen(scalePtr->label) : 0;
|
673 |
|
|
|
674 |
|
|
Tk_SetBackgroundFromBorder(scalePtr->tkwin, scalePtr->bgBorder);
|
675 |
|
|
|
676 |
|
|
if (scalePtr->highlightWidth < 0) {
|
677 |
|
|
scalePtr->highlightWidth = 0;
|
678 |
|
|
}
|
679 |
|
|
scalePtr->inset = scalePtr->highlightWidth + scalePtr->borderWidth;
|
680 |
|
|
break;
|
681 |
|
|
}
|
682 |
|
|
if (!error) {
|
683 |
|
|
Tk_FreeSavedOptions(&savedOptions);
|
684 |
|
|
}
|
685 |
|
|
|
686 |
|
|
/*
|
687 |
|
|
* Set the scale value to itself; all this does is to make sure
|
688 |
|
|
* that the scale's value is within the new acceptable range for
|
689 |
|
|
* the scale. We don't set the var here because we need to make
|
690 |
|
|
* special checks for possibly changed varNamePtr.
|
691 |
|
|
*/
|
692 |
|
|
|
693 |
|
|
TkScaleSetValue(scalePtr, scalePtr->value, 0, 1);
|
694 |
|
|
|
695 |
|
|
/*
|
696 |
|
|
* Reestablish the variable trace, if it is needed.
|
697 |
|
|
*/
|
698 |
|
|
|
699 |
|
|
if (scalePtr->varNamePtr != NULL) {
|
700 |
|
|
Tcl_Obj *valuePtr;
|
701 |
|
|
|
702 |
|
|
/*
|
703 |
|
|
* Set the associated variable only when the new value differs
|
704 |
|
|
* from the current value, or the variable doesn't yet exist
|
705 |
|
|
*/
|
706 |
|
|
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
|
707 |
|
|
TCL_GLOBAL_ONLY);
|
708 |
|
|
if ((valuePtr == NULL) || (scalePtr->value != oldValue)
|
709 |
|
|
|| (Tcl_GetDoubleFromObj(NULL, valuePtr, &oldValue) != TCL_OK)
|
710 |
|
|
|| (scalePtr->value != oldValue)) {
|
711 |
|
|
ScaleSetVariable(scalePtr);
|
712 |
|
|
}
|
713 |
|
|
Tcl_TraceVar(interp, Tcl_GetString(scalePtr->varNamePtr),
|
714 |
|
|
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
715 |
|
|
ScaleVarProc, (ClientData) scalePtr);
|
716 |
|
|
}
|
717 |
|
|
|
718 |
|
|
ScaleWorldChanged((ClientData) scalePtr);
|
719 |
|
|
if (error) {
|
720 |
|
|
Tcl_SetObjResult(interp, errorResult);
|
721 |
|
|
Tcl_DecrRefCount(errorResult);
|
722 |
|
|
return TCL_ERROR;
|
723 |
|
|
} else {
|
724 |
|
|
return TCL_OK;
|
725 |
|
|
}
|
726 |
|
|
}
|
727 |
|
|
|
728 |
|
|
/*
|
729 |
|
|
*---------------------------------------------------------------------------
|
730 |
|
|
*
|
731 |
|
|
* ScaleWorldChanged --
|
732 |
|
|
*
|
733 |
|
|
* This procedure is called when the world has changed in some
|
734 |
|
|
* way and the widget needs to recompute all its graphics contexts
|
735 |
|
|
* and determine its new geometry.
|
736 |
|
|
*
|
737 |
|
|
* Results:
|
738 |
|
|
* None.
|
739 |
|
|
*
|
740 |
|
|
* Side effects:
|
741 |
|
|
* Scale will be relayed out and redisplayed.
|
742 |
|
|
*
|
743 |
|
|
*---------------------------------------------------------------------------
|
744 |
|
|
*/
|
745 |
|
|
|
746 |
|
|
static void
|
747 |
|
|
ScaleWorldChanged(instanceData)
|
748 |
|
|
ClientData instanceData; /* Information about widget. */
|
749 |
|
|
{
|
750 |
|
|
XGCValues gcValues;
|
751 |
|
|
GC gc;
|
752 |
|
|
TkScale *scalePtr;
|
753 |
|
|
|
754 |
|
|
scalePtr = (TkScale *) instanceData;
|
755 |
|
|
|
756 |
|
|
gcValues.foreground = scalePtr->troughColorPtr->pixel;
|
757 |
|
|
gc = Tk_GetGC(scalePtr->tkwin, GCForeground, &gcValues);
|
758 |
|
|
if (scalePtr->troughGC != None) {
|
759 |
|
|
Tk_FreeGC(scalePtr->display, scalePtr->troughGC);
|
760 |
|
|
}
|
761 |
|
|
scalePtr->troughGC = gc;
|
762 |
|
|
|
763 |
|
|
gcValues.font = Tk_FontId(scalePtr->tkfont);
|
764 |
|
|
gcValues.foreground = scalePtr->textColorPtr->pixel;
|
765 |
|
|
gc = Tk_GetGC(scalePtr->tkwin, GCForeground | GCFont, &gcValues);
|
766 |
|
|
if (scalePtr->textGC != None) {
|
767 |
|
|
Tk_FreeGC(scalePtr->display, scalePtr->textGC);
|
768 |
|
|
}
|
769 |
|
|
scalePtr->textGC = gc;
|
770 |
|
|
|
771 |
|
|
if (scalePtr->copyGC == None) {
|
772 |
|
|
gcValues.graphics_exposures = False;
|
773 |
|
|
scalePtr->copyGC = Tk_GetGC(scalePtr->tkwin, GCGraphicsExposures,
|
774 |
|
|
&gcValues);
|
775 |
|
|
}
|
776 |
|
|
scalePtr->inset = scalePtr->highlightWidth + scalePtr->borderWidth;
|
777 |
|
|
|
778 |
|
|
/*
|
779 |
|
|
* Recompute display-related information, and let the geometry
|
780 |
|
|
* manager know how much space is needed now.
|
781 |
|
|
*/
|
782 |
|
|
|
783 |
|
|
ComputeScaleGeometry(scalePtr);
|
784 |
|
|
|
785 |
|
|
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
786 |
|
|
}
|
787 |
|
|
|
788 |
|
|
/*
|
789 |
|
|
*----------------------------------------------------------------------
|
790 |
|
|
*
|
791 |
|
|
* ComputeFormat --
|
792 |
|
|
*
|
793 |
|
|
* This procedure is invoked to recompute the "format" field
|
794 |
|
|
* of a scale's widget record, which determines how the value
|
795 |
|
|
* of the scale is converted to a string.
|
796 |
|
|
*
|
797 |
|
|
* Results:
|
798 |
|
|
* None.
|
799 |
|
|
*
|
800 |
|
|
* Side effects:
|
801 |
|
|
* The format field of scalePtr is modified.
|
802 |
|
|
*
|
803 |
|
|
*----------------------------------------------------------------------
|
804 |
|
|
*/
|
805 |
|
|
|
806 |
|
|
static void
|
807 |
|
|
ComputeFormat(scalePtr)
|
808 |
|
|
TkScale *scalePtr; /* Information about scale widget. */
|
809 |
|
|
{
|
810 |
|
|
double maxValue, x;
|
811 |
|
|
int mostSigDigit, numDigits, leastSigDigit, afterDecimal;
|
812 |
|
|
int eDigits, fDigits;
|
813 |
|
|
|
814 |
|
|
/*
|
815 |
|
|
* Compute the displacement from the decimal of the most significant
|
816 |
|
|
* digit required for any number in the scale's range.
|
817 |
|
|
*/
|
818 |
|
|
|
819 |
|
|
maxValue = fabs(scalePtr->fromValue);
|
820 |
|
|
x = fabs(scalePtr->toValue);
|
821 |
|
|
if (x > maxValue) {
|
822 |
|
|
maxValue = x;
|
823 |
|
|
}
|
824 |
|
|
if (maxValue == 0) {
|
825 |
|
|
maxValue = 1;
|
826 |
|
|
}
|
827 |
|
|
mostSigDigit = (int) floor(log10(maxValue));
|
828 |
|
|
|
829 |
|
|
/*
|
830 |
|
|
* If the number of significant digits wasn't specified explicitly,
|
831 |
|
|
* compute it. It's the difference between the most significant
|
832 |
|
|
* digit needed to represent any number on the scale and the
|
833 |
|
|
* most significant digit of the smallest difference between
|
834 |
|
|
* numbers on the scale. In other words, display enough digits so
|
835 |
|
|
* that at least one digit will be different between any two adjacent
|
836 |
|
|
* positions of the scale.
|
837 |
|
|
*/
|
838 |
|
|
|
839 |
|
|
numDigits = scalePtr->digits;
|
840 |
|
|
if (numDigits <= 0) {
|
841 |
|
|
if (scalePtr->resolution > 0) {
|
842 |
|
|
/*
|
843 |
|
|
* A resolution was specified for the scale, so just use it.
|
844 |
|
|
*/
|
845 |
|
|
|
846 |
|
|
leastSigDigit = (int) floor(log10(scalePtr->resolution));
|
847 |
|
|
} else {
|
848 |
|
|
/*
|
849 |
|
|
* No resolution was specified, so compute the difference
|
850 |
|
|
* in value between adjacent pixels and use it for the least
|
851 |
|
|
* significant digit.
|
852 |
|
|
*/
|
853 |
|
|
|
854 |
|
|
x = fabs(scalePtr->fromValue - scalePtr->toValue);
|
855 |
|
|
if (scalePtr->length > 0) {
|
856 |
|
|
x /= scalePtr->length;
|
857 |
|
|
}
|
858 |
|
|
if (x > 0){
|
859 |
|
|
leastSigDigit = (int) floor(log10(x));
|
860 |
|
|
} else {
|
861 |
|
|
leastSigDigit = 0;
|
862 |
|
|
}
|
863 |
|
|
}
|
864 |
|
|
numDigits = mostSigDigit - leastSigDigit + 1;
|
865 |
|
|
if (numDigits < 1) {
|
866 |
|
|
numDigits = 1;
|
867 |
|
|
}
|
868 |
|
|
}
|
869 |
|
|
|
870 |
|
|
/*
|
871 |
|
|
* Compute the number of characters required using "e" format and
|
872 |
|
|
* "f" format, and then choose whichever one takes fewer characters.
|
873 |
|
|
*/
|
874 |
|
|
|
875 |
|
|
eDigits = numDigits + 4;
|
876 |
|
|
if (numDigits > 1) {
|
877 |
|
|
eDigits++; /* Decimal point. */
|
878 |
|
|
}
|
879 |
|
|
afterDecimal = numDigits - mostSigDigit - 1;
|
880 |
|
|
if (afterDecimal < 0) {
|
881 |
|
|
afterDecimal = 0;
|
882 |
|
|
}
|
883 |
|
|
fDigits = (mostSigDigit >= 0) ? mostSigDigit + afterDecimal : afterDecimal;
|
884 |
|
|
if (afterDecimal > 0) {
|
885 |
|
|
fDigits++; /* Decimal point. */
|
886 |
|
|
}
|
887 |
|
|
if (mostSigDigit < 0) {
|
888 |
|
|
fDigits++; /* Zero to left of decimal point. */
|
889 |
|
|
}
|
890 |
|
|
if (fDigits <= eDigits) {
|
891 |
|
|
sprintf(scalePtr->format, "%%.%df", afterDecimal);
|
892 |
|
|
} else {
|
893 |
|
|
sprintf(scalePtr->format, "%%.%de", numDigits-1);
|
894 |
|
|
}
|
895 |
|
|
}
|
896 |
|
|
|
897 |
|
|
/*
|
898 |
|
|
*----------------------------------------------------------------------
|
899 |
|
|
*
|
900 |
|
|
* ComputeScaleGeometry --
|
901 |
|
|
*
|
902 |
|
|
* This procedure is called to compute various geometrical
|
903 |
|
|
* information for a scale, such as where various things get
|
904 |
|
|
* displayed. It's called when the window is reconfigured.
|
905 |
|
|
*
|
906 |
|
|
* Results:
|
907 |
|
|
* None.
|
908 |
|
|
*
|
909 |
|
|
* Side effects:
|
910 |
|
|
* Display-related numbers get changed in *scalePtr. The
|
911 |
|
|
* geometry manager gets told about the window's preferred size.
|
912 |
|
|
*
|
913 |
|
|
*----------------------------------------------------------------------
|
914 |
|
|
*/
|
915 |
|
|
|
916 |
|
|
static void
|
917 |
|
|
ComputeScaleGeometry(scalePtr)
|
918 |
|
|
register TkScale *scalePtr; /* Information about widget. */
|
919 |
|
|
{
|
920 |
|
|
char valueString[PRINT_CHARS];
|
921 |
|
|
int tmp, valuePixels, x, y, extraSpace;
|
922 |
|
|
Tk_FontMetrics fm;
|
923 |
|
|
|
924 |
|
|
Tk_GetFontMetrics(scalePtr->tkfont, &fm);
|
925 |
|
|
scalePtr->fontHeight = fm.linespace + SPACING;
|
926 |
|
|
|
927 |
|
|
/*
|
928 |
|
|
* Horizontal scales are simpler than vertical ones because
|
929 |
|
|
* all sizes are the same (the height of a line of text);
|
930 |
|
|
* handle them first and then quit.
|
931 |
|
|
*/
|
932 |
|
|
|
933 |
|
|
if (scalePtr->orient == ORIENT_HORIZONTAL) {
|
934 |
|
|
y = scalePtr->inset;
|
935 |
|
|
extraSpace = 0;
|
936 |
|
|
if (scalePtr->labelLength != 0) {
|
937 |
|
|
scalePtr->horizLabelY = y + SPACING;
|
938 |
|
|
y += scalePtr->fontHeight;
|
939 |
|
|
extraSpace = SPACING;
|
940 |
|
|
}
|
941 |
|
|
if (scalePtr->showValue) {
|
942 |
|
|
scalePtr->horizValueY = y + SPACING;
|
943 |
|
|
y += scalePtr->fontHeight;
|
944 |
|
|
extraSpace = SPACING;
|
945 |
|
|
} else {
|
946 |
|
|
scalePtr->horizValueY = y;
|
947 |
|
|
}
|
948 |
|
|
y += extraSpace;
|
949 |
|
|
scalePtr->horizTroughY = y;
|
950 |
|
|
y += scalePtr->width + 2*scalePtr->borderWidth;
|
951 |
|
|
if (scalePtr->tickInterval != 0) {
|
952 |
|
|
scalePtr->horizTickY = y + SPACING;
|
953 |
|
|
y += scalePtr->fontHeight + SPACING;
|
954 |
|
|
}
|
955 |
|
|
Tk_GeometryRequest(scalePtr->tkwin,
|
956 |
|
|
scalePtr->length + 2*scalePtr->inset, y + scalePtr->inset);
|
957 |
|
|
Tk_SetInternalBorder(scalePtr->tkwin, scalePtr->inset);
|
958 |
|
|
return;
|
959 |
|
|
}
|
960 |
|
|
|
961 |
|
|
/*
|
962 |
|
|
* Vertical scale: compute the amount of space needed to display
|
963 |
|
|
* the scales value by formatting strings for the two end points;
|
964 |
|
|
* use whichever length is longer.
|
965 |
|
|
*/
|
966 |
|
|
|
967 |
|
|
sprintf(valueString, scalePtr->format, scalePtr->fromValue);
|
968 |
|
|
valuePixels = Tk_TextWidth(scalePtr->tkfont, valueString, -1);
|
969 |
|
|
|
970 |
|
|
sprintf(valueString, scalePtr->format, scalePtr->toValue);
|
971 |
|
|
tmp = Tk_TextWidth(scalePtr->tkfont, valueString, -1);
|
972 |
|
|
if (valuePixels < tmp) {
|
973 |
|
|
valuePixels = tmp;
|
974 |
|
|
}
|
975 |
|
|
|
976 |
|
|
/*
|
977 |
|
|
* Assign x-locations to the elements of the scale, working from
|
978 |
|
|
* left to right.
|
979 |
|
|
*/
|
980 |
|
|
|
981 |
|
|
x = scalePtr->inset;
|
982 |
|
|
if ((scalePtr->tickInterval != 0) && (scalePtr->showValue)) {
|
983 |
|
|
scalePtr->vertTickRightX = x + SPACING + valuePixels;
|
984 |
|
|
scalePtr->vertValueRightX = scalePtr->vertTickRightX + valuePixels
|
985 |
|
|
+ fm.ascent/2;
|
986 |
|
|
x = scalePtr->vertValueRightX + SPACING;
|
987 |
|
|
} else if (scalePtr->tickInterval != 0) {
|
988 |
|
|
scalePtr->vertTickRightX = x + SPACING + valuePixels;
|
989 |
|
|
scalePtr->vertValueRightX = scalePtr->vertTickRightX;
|
990 |
|
|
x = scalePtr->vertTickRightX + SPACING;
|
991 |
|
|
} else if (scalePtr->showValue) {
|
992 |
|
|
scalePtr->vertTickRightX = x;
|
993 |
|
|
scalePtr->vertValueRightX = x + SPACING + valuePixels;
|
994 |
|
|
x = scalePtr->vertValueRightX + SPACING;
|
995 |
|
|
} else {
|
996 |
|
|
scalePtr->vertTickRightX = x;
|
997 |
|
|
scalePtr->vertValueRightX = x;
|
998 |
|
|
}
|
999 |
|
|
scalePtr->vertTroughX = x;
|
1000 |
|
|
x += 2*scalePtr->borderWidth + scalePtr->width;
|
1001 |
|
|
if (scalePtr->labelLength == 0) {
|
1002 |
|
|
scalePtr->vertLabelX = 0;
|
1003 |
|
|
} else {
|
1004 |
|
|
scalePtr->vertLabelX = x + fm.ascent/2;
|
1005 |
|
|
x = scalePtr->vertLabelX + fm.ascent/2
|
1006 |
|
|
+ Tk_TextWidth(scalePtr->tkfont, scalePtr->label,
|
1007 |
|
|
scalePtr->labelLength);
|
1008 |
|
|
}
|
1009 |
|
|
Tk_GeometryRequest(scalePtr->tkwin, x + scalePtr->inset,
|
1010 |
|
|
scalePtr->length + 2*scalePtr->inset);
|
1011 |
|
|
Tk_SetInternalBorder(scalePtr->tkwin, scalePtr->inset);
|
1012 |
|
|
}
|
1013 |
|
|
|
1014 |
|
|
/*
|
1015 |
|
|
*--------------------------------------------------------------
|
1016 |
|
|
*
|
1017 |
|
|
* ScaleEventProc --
|
1018 |
|
|
*
|
1019 |
|
|
* This procedure is invoked by the Tk dispatcher for various
|
1020 |
|
|
* events on scales.
|
1021 |
|
|
*
|
1022 |
|
|
* Results:
|
1023 |
|
|
* None.
|
1024 |
|
|
*
|
1025 |
|
|
* Side effects:
|
1026 |
|
|
* When the window gets deleted, internal structures get
|
1027 |
|
|
* cleaned up. When it gets exposed, it is redisplayed.
|
1028 |
|
|
*
|
1029 |
|
|
*--------------------------------------------------------------
|
1030 |
|
|
*/
|
1031 |
|
|
|
1032 |
|
|
static void
|
1033 |
|
|
ScaleEventProc(clientData, eventPtr)
|
1034 |
|
|
ClientData clientData; /* Information about window. */
|
1035 |
|
|
XEvent *eventPtr; /* Information about event. */
|
1036 |
|
|
{
|
1037 |
|
|
TkScale *scalePtr = (TkScale *) clientData;
|
1038 |
|
|
|
1039 |
|
|
if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
|
1040 |
|
|
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
1041 |
|
|
} else if (eventPtr->type == DestroyNotify) {
|
1042 |
|
|
DestroyScale((char *) clientData);
|
1043 |
|
|
} else if (eventPtr->type == ConfigureNotify) {
|
1044 |
|
|
ComputeScaleGeometry(scalePtr);
|
1045 |
|
|
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
1046 |
|
|
} else if (eventPtr->type == FocusIn) {
|
1047 |
|
|
if (eventPtr->xfocus.detail != NotifyInferior) {
|
1048 |
|
|
scalePtr->flags |= GOT_FOCUS;
|
1049 |
|
|
if (scalePtr->highlightWidth > 0) {
|
1050 |
|
|
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
1051 |
|
|
}
|
1052 |
|
|
}
|
1053 |
|
|
} else if (eventPtr->type == FocusOut) {
|
1054 |
|
|
if (eventPtr->xfocus.detail != NotifyInferior) {
|
1055 |
|
|
scalePtr->flags &= ~GOT_FOCUS;
|
1056 |
|
|
if (scalePtr->highlightWidth > 0) {
|
1057 |
|
|
TkEventuallyRedrawScale(scalePtr, REDRAW_ALL);
|
1058 |
|
|
}
|
1059 |
|
|
}
|
1060 |
|
|
}
|
1061 |
|
|
}
|
1062 |
|
|
|
1063 |
|
|
/*
|
1064 |
|
|
*----------------------------------------------------------------------
|
1065 |
|
|
*
|
1066 |
|
|
* ScaleCmdDeletedProc --
|
1067 |
|
|
*
|
1068 |
|
|
* This procedure is invoked when a widget command is deleted. If
|
1069 |
|
|
* the widget isn't already in the process of being destroyed,
|
1070 |
|
|
* this command destroys it.
|
1071 |
|
|
*
|
1072 |
|
|
* Results:
|
1073 |
|
|
* None.
|
1074 |
|
|
*
|
1075 |
|
|
* Side effects:
|
1076 |
|
|
* The widget is destroyed.
|
1077 |
|
|
*
|
1078 |
|
|
*----------------------------------------------------------------------
|
1079 |
|
|
*/
|
1080 |
|
|
|
1081 |
|
|
static void
|
1082 |
|
|
ScaleCmdDeletedProc(clientData)
|
1083 |
|
|
ClientData clientData; /* Pointer to widget record for widget. */
|
1084 |
|
|
{
|
1085 |
|
|
TkScale *scalePtr = (TkScale *) clientData;
|
1086 |
|
|
Tk_Window tkwin = scalePtr->tkwin;
|
1087 |
|
|
|
1088 |
|
|
/*
|
1089 |
|
|
* This procedure could be invoked either because the window was
|
1090 |
|
|
* destroyed and the command was then deleted (in which case tkwin
|
1091 |
|
|
* is NULL) or because the command was deleted, and then this procedure
|
1092 |
|
|
* destroys the widget.
|
1093 |
|
|
*/
|
1094 |
|
|
|
1095 |
|
|
if (!(scalePtr->flags & SCALE_DELETED)) {
|
1096 |
|
|
scalePtr->flags |= SCALE_DELETED;
|
1097 |
|
|
Tk_DestroyWindow(tkwin);
|
1098 |
|
|
}
|
1099 |
|
|
}
|
1100 |
|
|
|
1101 |
|
|
/*
|
1102 |
|
|
*--------------------------------------------------------------
|
1103 |
|
|
*
|
1104 |
|
|
* TkEventuallyRedrawScale --
|
1105 |
|
|
*
|
1106 |
|
|
* Arrange for part or all of a scale widget to redrawn at
|
1107 |
|
|
* the next convenient time in the future.
|
1108 |
|
|
*
|
1109 |
|
|
* Results:
|
1110 |
|
|
* None.
|
1111 |
|
|
*
|
1112 |
|
|
* Side effects:
|
1113 |
|
|
* If "what" is REDRAW_SLIDER then just the slider and the
|
1114 |
|
|
* value readout will be redrawn; if "what" is REDRAW_ALL
|
1115 |
|
|
* then the entire widget will be redrawn.
|
1116 |
|
|
*
|
1117 |
|
|
*--------------------------------------------------------------
|
1118 |
|
|
*/
|
1119 |
|
|
|
1120 |
|
|
void
|
1121 |
|
|
TkEventuallyRedrawScale(scalePtr, what)
|
1122 |
|
|
register TkScale *scalePtr; /* Information about widget. */
|
1123 |
|
|
int what; /* What to redraw: REDRAW_SLIDER
|
1124 |
|
|
* or REDRAW_ALL. */
|
1125 |
|
|
{
|
1126 |
|
|
if ((what == 0) || (scalePtr->tkwin == NULL)
|
1127 |
|
|
|| !Tk_IsMapped(scalePtr->tkwin)) {
|
1128 |
|
|
return;
|
1129 |
|
|
}
|
1130 |
|
|
if (!(scalePtr->flags & REDRAW_PENDING)) {
|
1131 |
|
|
scalePtr->flags |= REDRAW_PENDING;
|
1132 |
|
|
Tcl_DoWhenIdle(TkpDisplayScale, (ClientData) scalePtr);
|
1133 |
|
|
}
|
1134 |
|
|
scalePtr->flags |= what;
|
1135 |
|
|
}
|
1136 |
|
|
|
1137 |
|
|
/*
|
1138 |
|
|
*--------------------------------------------------------------
|
1139 |
|
|
*
|
1140 |
|
|
* TkRoundToResolution --
|
1141 |
|
|
*
|
1142 |
|
|
* Round a given floating-point value to the nearest multiple
|
1143 |
|
|
* of the scale's resolution.
|
1144 |
|
|
*
|
1145 |
|
|
* Results:
|
1146 |
|
|
* The return value is the rounded result.
|
1147 |
|
|
*
|
1148 |
|
|
* Side effects:
|
1149 |
|
|
* None.
|
1150 |
|
|
*
|
1151 |
|
|
*--------------------------------------------------------------
|
1152 |
|
|
*/
|
1153 |
|
|
|
1154 |
|
|
double
|
1155 |
|
|
TkRoundToResolution(scalePtr, value)
|
1156 |
|
|
TkScale *scalePtr; /* Information about scale widget. */
|
1157 |
|
|
double value; /* Value to round. */
|
1158 |
|
|
{
|
1159 |
|
|
double rem, new, tick;
|
1160 |
|
|
|
1161 |
|
|
if (scalePtr->resolution <= 0) {
|
1162 |
|
|
return value;
|
1163 |
|
|
}
|
1164 |
|
|
tick = floor(value/scalePtr->resolution);
|
1165 |
|
|
new = scalePtr->resolution * tick;
|
1166 |
|
|
rem = value - new;
|
1167 |
|
|
if (rem < 0) {
|
1168 |
|
|
if (rem <= -scalePtr->resolution/2) {
|
1169 |
|
|
new = (tick - 1.0) * scalePtr->resolution;
|
1170 |
|
|
}
|
1171 |
|
|
} else {
|
1172 |
|
|
if (rem >= scalePtr->resolution/2) {
|
1173 |
|
|
new = (tick + 1.0) * scalePtr->resolution;
|
1174 |
|
|
}
|
1175 |
|
|
}
|
1176 |
|
|
return new;
|
1177 |
|
|
}
|
1178 |
|
|
|
1179 |
|
|
/*
|
1180 |
|
|
*----------------------------------------------------------------------
|
1181 |
|
|
*
|
1182 |
|
|
* ScaleVarProc --
|
1183 |
|
|
*
|
1184 |
|
|
* This procedure is invoked by Tcl whenever someone modifies a
|
1185 |
|
|
* variable associated with a scale widget.
|
1186 |
|
|
*
|
1187 |
|
|
* Results:
|
1188 |
|
|
* NULL is always returned.
|
1189 |
|
|
*
|
1190 |
|
|
* Side effects:
|
1191 |
|
|
* The value displayed in the scale will change to match the
|
1192 |
|
|
* variable's new value. If the variable has a bogus value then
|
1193 |
|
|
* it is reset to the value of the scale.
|
1194 |
|
|
*
|
1195 |
|
|
*----------------------------------------------------------------------
|
1196 |
|
|
*/
|
1197 |
|
|
|
1198 |
|
|
/* ARGSUSED */
|
1199 |
|
|
static char *
|
1200 |
|
|
ScaleVarProc(clientData, interp, name1, name2, flags)
|
1201 |
|
|
ClientData clientData; /* Information about button. */
|
1202 |
|
|
Tcl_Interp *interp; /* Interpreter containing variable. */
|
1203 |
|
|
char *name1; /* Name of variable. */
|
1204 |
|
|
char *name2; /* Second part of variable name. */
|
1205 |
|
|
int flags; /* Information about what happened. */
|
1206 |
|
|
{
|
1207 |
|
|
register TkScale *scalePtr = (TkScale *) clientData;
|
1208 |
|
|
char *resultStr;
|
1209 |
|
|
double value;
|
1210 |
|
|
Tcl_Obj *valuePtr;
|
1211 |
|
|
int result;
|
1212 |
|
|
|
1213 |
|
|
/*
|
1214 |
|
|
* If the variable is unset, then immediately recreate it unless
|
1215 |
|
|
* the whole interpreter is going away.
|
1216 |
|
|
*/
|
1217 |
|
|
|
1218 |
|
|
if (flags & TCL_TRACE_UNSETS) {
|
1219 |
|
|
if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
|
1220 |
|
|
Tcl_TraceVar(interp, Tcl_GetString(scalePtr->varNamePtr),
|
1221 |
|
|
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
1222 |
|
|
ScaleVarProc, clientData);
|
1223 |
|
|
scalePtr->flags |= NEVER_SET;
|
1224 |
|
|
TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
|
1225 |
|
|
}
|
1226 |
|
|
return (char *) NULL;
|
1227 |
|
|
}
|
1228 |
|
|
|
1229 |
|
|
/*
|
1230 |
|
|
* If we came here because we updated the variable (in TkScaleSetValue),
|
1231 |
|
|
* then ignore the trace. Otherwise update the scale with the value
|
1232 |
|
|
* of the variable.
|
1233 |
|
|
*/
|
1234 |
|
|
|
1235 |
|
|
if (scalePtr->flags & SETTING_VAR) {
|
1236 |
|
|
return (char *) NULL;
|
1237 |
|
|
}
|
1238 |
|
|
resultStr = NULL;
|
1239 |
|
|
valuePtr = Tcl_ObjGetVar2(interp, scalePtr->varNamePtr, NULL,
|
1240 |
|
|
TCL_GLOBAL_ONLY);
|
1241 |
|
|
result = Tcl_GetDoubleFromObj(interp, valuePtr, &value);
|
1242 |
|
|
if (result != TCL_OK) {
|
1243 |
|
|
resultStr = "can't assign non-numeric value to scale variable";
|
1244 |
|
|
ScaleSetVariable(scalePtr);
|
1245 |
|
|
} else {
|
1246 |
|
|
scalePtr->value = TkRoundToResolution(scalePtr, value);
|
1247 |
|
|
|
1248 |
|
|
/*
|
1249 |
|
|
* This code is a bit tricky because it sets the scale's value before
|
1250 |
|
|
* calling TkScaleSetValue. This way, TkScaleSetValue won't bother
|
1251 |
|
|
* to set the variable again or to invoke the -command. However, it
|
1252 |
|
|
* also won't redisplay the scale, so we have to ask for that
|
1253 |
|
|
* explicitly.
|
1254 |
|
|
*/
|
1255 |
|
|
|
1256 |
|
|
TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
|
1257 |
|
|
}
|
1258 |
|
|
TkEventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
|
1259 |
|
|
|
1260 |
|
|
return resultStr;
|
1261 |
|
|
}
|
1262 |
|
|
|
1263 |
|
|
/*
|
1264 |
|
|
*--------------------------------------------------------------
|
1265 |
|
|
*
|
1266 |
|
|
* TkScaleSetValue --
|
1267 |
|
|
*
|
1268 |
|
|
* This procedure changes the value of a scale and invokes
|
1269 |
|
|
* a Tcl command to reflect the current position of a scale
|
1270 |
|
|
*
|
1271 |
|
|
* Results:
|
1272 |
|
|
* None.
|
1273 |
|
|
*
|
1274 |
|
|
* Side effects:
|
1275 |
|
|
* A Tcl command is invoked, and an additional error-processing
|
1276 |
|
|
* command may also be invoked. The scale's slider is redrawn.
|
1277 |
|
|
*
|
1278 |
|
|
*--------------------------------------------------------------
|
1279 |
|
|
*/
|
1280 |
|
|
|
1281 |
|
|
void
|
1282 |
|
|
TkScaleSetValue(scalePtr, value, setVar, invokeCommand)
|
1283 |
|
|
register TkScale *scalePtr; /* Info about widget. */
|
1284 |
|
|
double value; /* New value for scale. Gets adjusted
|
1285 |
|
|
* if it's off the scale. */
|
1286 |
|
|
int setVar; /* Non-zero means reflect new value through
|
1287 |
|
|
* to associated variable, if any. */
|
1288 |
|
|
int invokeCommand; /* Non-zero means invoked -command option
|
1289 |
|
|
* to notify of new value, 0 means don't. */
|
1290 |
|
|
{
|
1291 |
|
|
value = TkRoundToResolution(scalePtr, value);
|
1292 |
|
|
if ((value < scalePtr->fromValue)
|
1293 |
|
|
^ (scalePtr->toValue < scalePtr->fromValue)) {
|
1294 |
|
|
value = scalePtr->fromValue;
|
1295 |
|
|
}
|
1296 |
|
|
if ((value > scalePtr->toValue)
|
1297 |
|
|
^ (scalePtr->toValue < scalePtr->fromValue)) {
|
1298 |
|
|
value = scalePtr->toValue;
|
1299 |
|
|
}
|
1300 |
|
|
if (scalePtr->flags & NEVER_SET) {
|
1301 |
|
|
scalePtr->flags &= ~NEVER_SET;
|
1302 |
|
|
} else if (scalePtr->value == value) {
|
1303 |
|
|
return;
|
1304 |
|
|
}
|
1305 |
|
|
scalePtr->value = value;
|
1306 |
|
|
if (invokeCommand) {
|
1307 |
|
|
scalePtr->flags |= INVOKE_COMMAND;
|
1308 |
|
|
}
|
1309 |
|
|
TkEventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
|
1310 |
|
|
|
1311 |
|
|
if (setVar && scalePtr->varNamePtr) {
|
1312 |
|
|
ScaleSetVariable(scalePtr);
|
1313 |
|
|
}
|
1314 |
|
|
}
|
1315 |
|
|
|
1316 |
|
|
/*
|
1317 |
|
|
*--------------------------------------------------------------
|
1318 |
|
|
*
|
1319 |
|
|
* ScaleSetVariable --
|
1320 |
|
|
*
|
1321 |
|
|
* This procedure sets the variable associated with a scale, if any.
|
1322 |
|
|
*
|
1323 |
|
|
* Results:
|
1324 |
|
|
* None.
|
1325 |
|
|
*
|
1326 |
|
|
* Side effects:
|
1327 |
|
|
* Other write traces on the variable will trigger.
|
1328 |
|
|
*
|
1329 |
|
|
*--------------------------------------------------------------
|
1330 |
|
|
*/
|
1331 |
|
|
|
1332 |
|
|
static void
|
1333 |
|
|
ScaleSetVariable(scalePtr)
|
1334 |
|
|
register TkScale *scalePtr; /* Info about widget. */
|
1335 |
|
|
{
|
1336 |
|
|
if (scalePtr->varNamePtr != NULL) {
|
1337 |
|
|
char string[PRINT_CHARS];
|
1338 |
|
|
sprintf(string, scalePtr->format, scalePtr->value);
|
1339 |
|
|
scalePtr->flags |= SETTING_VAR;
|
1340 |
|
|
Tcl_ObjSetVar2(scalePtr->interp, scalePtr->varNamePtr, NULL,
|
1341 |
|
|
Tcl_NewStringObj(string, -1), TCL_GLOBAL_ONLY);
|
1342 |
|
|
scalePtr->flags &= ~SETTING_VAR;
|
1343 |
|
|
}
|
1344 |
|
|
}
|
1345 |
|
|
|
1346 |
|
|
/*
|
1347 |
|
|
*----------------------------------------------------------------------
|
1348 |
|
|
*
|
1349 |
|
|
* TkScalePixelToValue --
|
1350 |
|
|
*
|
1351 |
|
|
* Given a pixel within a scale window, return the scale
|
1352 |
|
|
* reading corresponding to that pixel.
|
1353 |
|
|
*
|
1354 |
|
|
* Results:
|
1355 |
|
|
* A double-precision scale reading. If the value is outside
|
1356 |
|
|
* the legal range for the scale then it's rounded to the nearest
|
1357 |
|
|
* end of the scale.
|
1358 |
|
|
*
|
1359 |
|
|
* Side effects:
|
1360 |
|
|
* None.
|
1361 |
|
|
*
|
1362 |
|
|
*----------------------------------------------------------------------
|
1363 |
|
|
*/
|
1364 |
|
|
|
1365 |
|
|
double
|
1366 |
|
|
TkScalePixelToValue(scalePtr, x, y)
|
1367 |
|
|
register TkScale *scalePtr; /* Information about widget. */
|
1368 |
|
|
int x, y; /* Coordinates of point within
|
1369 |
|
|
* window. */
|
1370 |
|
|
{
|
1371 |
|
|
double value, pixelRange;
|
1372 |
|
|
|
1373 |
|
|
if (scalePtr->orient == ORIENT_VERTICAL) {
|
1374 |
|
|
pixelRange = Tk_Height(scalePtr->tkwin) - scalePtr->sliderLength
|
1375 |
|
|
- 2*scalePtr->inset - 2*scalePtr->borderWidth;
|
1376 |
|
|
value = y;
|
1377 |
|
|
} else {
|
1378 |
|
|
pixelRange = Tk_Width(scalePtr->tkwin) - scalePtr->sliderLength
|
1379 |
|
|
- 2*scalePtr->inset - 2*scalePtr->borderWidth;
|
1380 |
|
|
value = x;
|
1381 |
|
|
}
|
1382 |
|
|
|
1383 |
|
|
if (pixelRange <= 0) {
|
1384 |
|
|
/*
|
1385 |
|
|
* Not enough room for the slider to actually slide: just return
|
1386 |
|
|
* the scale's current value.
|
1387 |
|
|
*/
|
1388 |
|
|
|
1389 |
|
|
return scalePtr->value;
|
1390 |
|
|
}
|
1391 |
|
|
value -= scalePtr->sliderLength/2 + scalePtr->inset
|
1392 |
|
|
+ scalePtr->borderWidth;
|
1393 |
|
|
value /= pixelRange;
|
1394 |
|
|
if (value < 0) {
|
1395 |
|
|
value = 0;
|
1396 |
|
|
}
|
1397 |
|
|
if (value > 1) {
|
1398 |
|
|
value = 1;
|
1399 |
|
|
}
|
1400 |
|
|
value = scalePtr->fromValue +
|
1401 |
|
|
value * (scalePtr->toValue - scalePtr->fromValue);
|
1402 |
|
|
return TkRoundToResolution(scalePtr, value);
|
1403 |
|
|
}
|
1404 |
|
|
|
1405 |
|
|
/*
|
1406 |
|
|
*----------------------------------------------------------------------
|
1407 |
|
|
*
|
1408 |
|
|
* TkScaleValueToPixel --
|
1409 |
|
|
*
|
1410 |
|
|
* Given a reading of the scale, return the x-coordinate or
|
1411 |
|
|
* y-coordinate corresponding to that reading, depending on
|
1412 |
|
|
* whether the scale is vertical or horizontal, respectively.
|
1413 |
|
|
*
|
1414 |
|
|
* Results:
|
1415 |
|
|
* An integer value giving the pixel location corresponding
|
1416 |
|
|
* to reading. The value is restricted to lie within the
|
1417 |
|
|
* defined range for the scale.
|
1418 |
|
|
*
|
1419 |
|
|
* Side effects:
|
1420 |
|
|
* None.
|
1421 |
|
|
*
|
1422 |
|
|
*----------------------------------------------------------------------
|
1423 |
|
|
*/
|
1424 |
|
|
|
1425 |
|
|
int
|
1426 |
|
|
TkScaleValueToPixel(scalePtr, value)
|
1427 |
|
|
register TkScale *scalePtr; /* Information about widget. */
|
1428 |
|
|
double value; /* Reading of the widget. */
|
1429 |
|
|
{
|
1430 |
|
|
int y, pixelRange;
|
1431 |
|
|
double valueRange;
|
1432 |
|
|
|
1433 |
|
|
valueRange = scalePtr->toValue - scalePtr->fromValue;
|
1434 |
|
|
pixelRange = ((scalePtr->orient == ORIENT_VERTICAL)
|
1435 |
|
|
? Tk_Height(scalePtr->tkwin) : Tk_Width(scalePtr->tkwin))
|
1436 |
|
|
- scalePtr->sliderLength - 2*scalePtr->inset - 2*scalePtr->borderWidth;
|
1437 |
|
|
if (valueRange == 0) {
|
1438 |
|
|
y = 0;
|
1439 |
|
|
} else {
|
1440 |
|
|
y = (int) ((value - scalePtr->fromValue) * pixelRange
|
1441 |
|
|
/ valueRange + 0.5);
|
1442 |
|
|
if (y < 0) {
|
1443 |
|
|
y = 0;
|
1444 |
|
|
} else if (y > pixelRange) {
|
1445 |
|
|
y = pixelRange;
|
1446 |
|
|
}
|
1447 |
|
|
}
|
1448 |
|
|
y += scalePtr->sliderLength/2 + scalePtr->inset + scalePtr->borderWidth;
|
1449 |
|
|
return y;
|
1450 |
|
|
}
|
1451 |
|
|
|
1452 |
|
|
|
1453 |
|
|
/* $History: tkScale.c $
|
1454 |
|
|
*
|
1455 |
|
|
* ***************** Version 1 *****************
|
1456 |
|
|
* User: Dtashley Date: 1/02/01 Time: 3:03a
|
1457 |
|
|
* Created in $/IjuScripter, IjuConsole/Source/Tk Base
|
1458 |
|
|
* Initial check-in.
|
1459 |
|
|
*/
|
1460 |
|
|
|
1461 |
|
|
/* End of TKSCALE.C */ |