1225 lines
39 KiB
C
1225 lines
39 KiB
C
/*
|
||
* tkScrollbar.c --
|
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*
|
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* This module implements a scrollbar widgets for the Tk
|
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* toolkit. A scrollbar displays a slider and two arrows;
|
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* mouse clicks on features within the scrollbar cause
|
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* scrolling commands to be invoked.
|
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*
|
||
* Copyright (c) 1990-1994 The Regents of the University of California.
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* Copyright (c) 1994-1995 Sun Microsystems, Inc.
|
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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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* SCCS: @(#) tkScrollbar.c 1.79 96/02/15 18:52:40
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*/
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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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|
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/*
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* A data structure of the following type is kept for each scrollbar
|
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* widget managed by this file:
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||
*/
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typedef struct {
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Tk_Window tkwin; /* Window that embodies the scrollbar. NULL
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* means that the window has been destroyed
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* but the data structures haven't yet been
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* cleaned up.*/
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Display *display; /* Display containing widget. Used, among
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* other things, so that resources can be
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* freed even after tkwin has gone away. */
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Tcl_Interp *interp; /* Interpreter associated with scrollbar. */
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Tcl_Command widgetCmd; /* Token for scrollbar's widget command. */
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Tk_Uid orientUid; /* Orientation for window ("vertical" or
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* "horizontal"). */
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int vertical; /* Non-zero means vertical orientation
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* requested, zero means horizontal. */
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int width; /* Desired narrow dimension of scrollbar,
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* in pixels. */
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char *command; /* Command prefix to use when invoking
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* scrolling commands. NULL means don't
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* invoke commands. Malloc'ed. */
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int commandSize; /* Number of non-NULL bytes in command. */
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int repeatDelay; /* How long to wait before auto-repeating
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* on scrolling actions (in ms). */
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int repeatInterval; /* Interval between autorepeats (in ms). */
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int jump; /* Value of -jump option. */
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/*
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* Information used when displaying widget:
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*/
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int borderWidth; /* Width of 3-D borders. */
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Tk_3DBorder bgBorder; /* Used for drawing background (all flat
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* surfaces except for trough). */
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Tk_3DBorder activeBorder; /* For drawing backgrounds when active (i.e.
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* when mouse is positioned over element). */
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XColor *troughColorPtr; /* Color for drawing trough. */
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GC troughGC; /* For drawing trough. */
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GC copyGC; /* Used for copying from pixmap onto screen. */
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int relief; /* Indicates whether window as a whole is
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* raised, sunken, or flat. */
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int highlightWidth; /* Width in pixels of highlight to draw
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* around widget when it has the focus.
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* <= 0 means don't draw a highlight. */
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XColor *highlightBgColorPtr;
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/* Color for drawing traversal highlight
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* area when highlight is off. */
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XColor *highlightColorPtr; /* Color for drawing traversal highlight. */
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int inset; /* Total width of all borders, including
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* traversal highlight and 3-D border.
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* Indicates how much interior stuff must
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* be offset from outside edges to leave
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* room for borders. */
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int elementBorderWidth; /* Width of border to draw around elements
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* inside scrollbar (arrows and slider).
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* -1 means use borderWidth. */
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int arrowLength; /* Length of arrows along long dimension of
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* scrollbar, including space for a small gap
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* between the arrow and the slider.
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* Recomputed on window size changes. */
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int sliderFirst; /* Pixel coordinate of top or left edge
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* of slider area, including border. */
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int sliderLast; /* Coordinate of pixel just after bottom
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* or right edge of slider area, including
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* border. */
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int activeField; /* Names field to be displayed in active
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* colors, such as TOP_ARROW, or 0 for
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* no field. */
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int activeRelief; /* Value of -activeRelief option: relief
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* to use for active element. */
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/*
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* Information describing the application related to the scrollbar.
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* This information is provided by the application by invoking the
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* "set" widget command. This information can now be provided in
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* two ways: the "old" form (totalUnits, windowUnits, firstUnit,
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* and lastUnit), or the "new" form (firstFraction and lastFraction).
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* FirstFraction and lastFraction will always be valid, but
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* the old-style information is only valid if the NEW_STYLE_COMMANDS
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* flag is 0.
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*/
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int totalUnits; /* Total dimension of application, in
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* units. Valid only if the NEW_STYLE_COMMANDS
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* flag isn't set. */
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int windowUnits; /* Maximum number of units that can be
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* displayed in the window at once. Valid
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* only if the NEW_STYLE_COMMANDS flag isn't
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* set. */
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int firstUnit; /* Number of last unit visible in
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* application's window. Valid only if the
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* NEW_STYLE_COMMANDS flag isn't set. */
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int lastUnit; /* Index of last unit visible in window.
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* Valid only if the NEW_STYLE_COMMANDS
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* flag isn't set. */
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double firstFraction; /* Position of first visible thing in window,
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* specified as a fraction between 0 and
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* 1.0. */
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double lastFraction; /* Position of last visible thing in window,
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* specified as a fraction between 0 and
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* 1.0. */
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/*
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* Miscellaneous information:
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*/
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Tk_Cursor cursor; /* Current cursor for window, or None. */
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char *takeFocus; /* Value of -takefocus option; not used in
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* the C code, but used by keyboard traversal
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* scripts. Malloc'ed, but may be NULL. */
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int flags; /* Various flags; see below for
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* definitions. */
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} Scrollbar;
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/*
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* Legal values for "activeField" field of Scrollbar structures. These
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* are also the return values from the ScrollbarPosition procedure.
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*/
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#define OUTSIDE 0
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#define TOP_ARROW 1
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#define TOP_GAP 2
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#define SLIDER 3
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#define BOTTOM_GAP 4
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#define BOTTOM_ARROW 5
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/*
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* Flag bits for scrollbars:
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*
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* REDRAW_PENDING: Non-zero means a DoWhenIdle handler
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* has already been queued to redraw
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* this window.
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* NEW_STYLE_COMMANDS: Non-zero means the new style of commands
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* should be used to communicate with the
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* widget: ".t yview scroll 2 lines", instead
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* of ".t yview 40", for example.
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* GOT_FOCUS: Non-zero means this window has the input
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* focus.
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*/
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#define REDRAW_PENDING 1
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#define NEW_STYLE_COMMANDS 2
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#define GOT_FOCUS 4
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/*
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* Minimum slider length, in pixels (designed to make sure that the slider
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* is always easy to grab with the mouse).
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*/
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#define MIN_SLIDER_LENGTH 5
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/*
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* Information used for argv parsing.
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*/
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static Tk_ConfigSpec configSpecs[] = {
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{TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
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DEF_SCROLLBAR_ACTIVE_BG_COLOR, Tk_Offset(Scrollbar, activeBorder),
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TK_CONFIG_COLOR_ONLY},
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{TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
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DEF_SCROLLBAR_ACTIVE_BG_MONO, Tk_Offset(Scrollbar, activeBorder),
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TK_CONFIG_MONO_ONLY},
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{TK_CONFIG_RELIEF, "-activerelief", "activeRelief", "Relief",
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DEF_SCROLLBAR_ACTIVE_RELIEF, Tk_Offset(Scrollbar, activeRelief), 0},
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{TK_CONFIG_BORDER, "-background", "background", "Background",
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DEF_SCROLLBAR_BG_COLOR, Tk_Offset(Scrollbar, bgBorder),
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TK_CONFIG_COLOR_ONLY},
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{TK_CONFIG_BORDER, "-background", "background", "Background",
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DEF_SCROLLBAR_BG_MONO, Tk_Offset(Scrollbar, bgBorder),
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TK_CONFIG_MONO_ONLY},
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{TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
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(char *) NULL, 0, 0},
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{TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
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(char *) NULL, 0, 0},
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{TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
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DEF_SCROLLBAR_BORDER_WIDTH, Tk_Offset(Scrollbar, borderWidth), 0},
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{TK_CONFIG_STRING, "-command", "command", "Command",
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DEF_SCROLLBAR_COMMAND, Tk_Offset(Scrollbar, command),
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TK_CONFIG_NULL_OK},
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{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
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DEF_SCROLLBAR_CURSOR, Tk_Offset(Scrollbar, cursor), TK_CONFIG_NULL_OK},
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{TK_CONFIG_PIXELS, "-elementborderwidth", "elementBorderWidth",
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"BorderWidth", DEF_SCROLLBAR_EL_BORDER_WIDTH,
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Tk_Offset(Scrollbar, elementBorderWidth), 0},
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{TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
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"HighlightBackground", DEF_SCROLLBAR_HIGHLIGHT_BG,
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Tk_Offset(Scrollbar, highlightBgColorPtr), 0},
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{TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
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DEF_SCROLLBAR_HIGHLIGHT,
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Tk_Offset(Scrollbar, highlightColorPtr), 0},
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{TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
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"HighlightThickness",
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DEF_SCROLLBAR_HIGHLIGHT_WIDTH, Tk_Offset(Scrollbar, highlightWidth), 0},
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{TK_CONFIG_BOOLEAN, "-jump", "jump", "Jump",
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DEF_SCROLLBAR_JUMP, Tk_Offset(Scrollbar, jump), 0},
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{TK_CONFIG_UID, "-orient", "orient", "Orient",
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DEF_SCROLLBAR_ORIENT, Tk_Offset(Scrollbar, orientUid), 0},
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{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
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DEF_SCROLLBAR_RELIEF, Tk_Offset(Scrollbar, relief), 0},
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{TK_CONFIG_INT, "-repeatdelay", "repeatDelay", "RepeatDelay",
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DEF_SCROLLBAR_REPEAT_DELAY, Tk_Offset(Scrollbar, repeatDelay), 0},
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{TK_CONFIG_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",
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DEF_SCROLLBAR_REPEAT_INTERVAL, Tk_Offset(Scrollbar, repeatInterval), 0},
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{TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
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DEF_SCROLLBAR_TAKE_FOCUS, Tk_Offset(Scrollbar, takeFocus),
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TK_CONFIG_NULL_OK},
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{TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",
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DEF_SCROLLBAR_TROUGH_COLOR, Tk_Offset(Scrollbar, troughColorPtr),
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TK_CONFIG_COLOR_ONLY},
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{TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",
|
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DEF_SCROLLBAR_TROUGH_MONO, Tk_Offset(Scrollbar, troughColorPtr),
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TK_CONFIG_MONO_ONLY},
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{TK_CONFIG_PIXELS, "-width", "width", "Width",
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DEF_SCROLLBAR_WIDTH, Tk_Offset(Scrollbar, width), 0},
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{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
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(char *) NULL, 0, 0}
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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 ComputeScrollbarGeometry _ANSI_ARGS_((
|
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Scrollbar *scrollPtr));
|
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static int ConfigureScrollbar _ANSI_ARGS_((Tcl_Interp *interp,
|
||
Scrollbar *scrollPtr, int argc, char **argv,
|
||
int flags));
|
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static void DestroyScrollbar _ANSI_ARGS_((char *memPtr));
|
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static void DisplayScrollbar _ANSI_ARGS_((ClientData clientData));
|
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static void EventuallyRedraw _ANSI_ARGS_((Scrollbar *scrollPtr));
|
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static void ScrollbarCmdDeletedProc _ANSI_ARGS_((
|
||
ClientData clientData));
|
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static void ScrollbarEventProc _ANSI_ARGS_((ClientData clientData,
|
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XEvent *eventPtr));
|
||
static int ScrollbarPosition _ANSI_ARGS_((Scrollbar *scrollPtr,
|
||
int x, int y));
|
||
static int ScrollbarWidgetCmd _ANSI_ARGS_((ClientData clientData,
|
||
Tcl_Interp *, int argc, char **argv));
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* Tk_ScrollbarCmd --
|
||
*
|
||
* This procedure is invoked to process the "scrollbar" Tcl
|
||
* command. See the user documentation for details on what
|
||
* it does.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result.
|
||
*
|
||
* Side effects:
|
||
* See the user documentation.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
Tk_ScrollbarCmd(clientData, interp, argc, argv)
|
||
ClientData clientData; /* Main window associated with
|
||
* interpreter. */
|
||
Tcl_Interp *interp; /* Current interpreter. */
|
||
int argc; /* Number of arguments. */
|
||
char **argv; /* Argument strings. */
|
||
{
|
||
Tk_Window tkwin = (Tk_Window) clientData;
|
||
register Scrollbar *scrollPtr;
|
||
Tk_Window new;
|
||
|
||
if (argc < 2) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " pathName ?options?\"", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
|
||
if (new == NULL) {
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* Initialize fields that won't be initialized by ConfigureScrollbar,
|
||
* or which ConfigureScrollbar expects to have reasonable values
|
||
* (e.g. resource pointers).
|
||
*/
|
||
|
||
scrollPtr = (Scrollbar *) ckalloc(sizeof(Scrollbar));
|
||
scrollPtr->tkwin = new;
|
||
scrollPtr->display = Tk_Display(new);
|
||
scrollPtr->interp = interp;
|
||
scrollPtr->widgetCmd = Tcl_CreateCommand(interp,
|
||
Tk_PathName(scrollPtr->tkwin), ScrollbarWidgetCmd,
|
||
(ClientData) scrollPtr, ScrollbarCmdDeletedProc);
|
||
scrollPtr->orientUid = NULL;
|
||
scrollPtr->vertical = 0;
|
||
scrollPtr->width = 0;
|
||
scrollPtr->command = NULL;
|
||
scrollPtr->commandSize = 0;
|
||
scrollPtr->repeatDelay = 0;
|
||
scrollPtr->repeatInterval = 0;
|
||
scrollPtr->borderWidth = 0;
|
||
scrollPtr->bgBorder = NULL;
|
||
scrollPtr->activeBorder = NULL;
|
||
scrollPtr->troughColorPtr = NULL;
|
||
scrollPtr->troughGC = None;
|
||
scrollPtr->copyGC = None;
|
||
scrollPtr->relief = TK_RELIEF_FLAT;
|
||
scrollPtr->highlightWidth = 0;
|
||
scrollPtr->highlightBgColorPtr = NULL;
|
||
scrollPtr->highlightColorPtr = NULL;
|
||
scrollPtr->inset = 0;
|
||
scrollPtr->elementBorderWidth = -1;
|
||
scrollPtr->arrowLength = 0;
|
||
scrollPtr->sliderFirst = 0;
|
||
scrollPtr->sliderLast = 0;
|
||
scrollPtr->activeField = 0;
|
||
scrollPtr->activeRelief = TK_RELIEF_RAISED;
|
||
scrollPtr->totalUnits = 0;
|
||
scrollPtr->windowUnits = 0;
|
||
scrollPtr->firstUnit = 0;
|
||
scrollPtr->lastUnit = 0;
|
||
scrollPtr->firstFraction = 0.0;
|
||
scrollPtr->lastFraction = 0.0;
|
||
scrollPtr->cursor = None;
|
||
scrollPtr->takeFocus = NULL;
|
||
scrollPtr->flags = 0;
|
||
|
||
Tk_SetClass(scrollPtr->tkwin, "Scrollbar");
|
||
Tk_CreateEventHandler(scrollPtr->tkwin,
|
||
ExposureMask|StructureNotifyMask|FocusChangeMask,
|
||
ScrollbarEventProc, (ClientData) scrollPtr);
|
||
if (ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2, 0) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
|
||
interp->result = Tk_PathName(scrollPtr->tkwin);
|
||
return TCL_OK;
|
||
|
||
error:
|
||
Tk_DestroyWindow(scrollPtr->tkwin);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScrollbarWidgetCmd --
|
||
*
|
||
* This procedure is invoked to process the Tcl command
|
||
* that corresponds to a widget managed by this module.
|
||
* See the user documentation for details on what it does.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result.
|
||
*
|
||
* Side effects:
|
||
* See the user documentation.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
ScrollbarWidgetCmd(clientData, interp, argc, argv)
|
||
ClientData clientData; /* Information about scrollbar
|
||
* widget. */
|
||
Tcl_Interp *interp; /* Current interpreter. */
|
||
int argc; /* Number of arguments. */
|
||
char **argv; /* Argument strings. */
|
||
{
|
||
register Scrollbar *scrollPtr = (Scrollbar *) clientData;
|
||
int result = TCL_OK;
|
||
size_t length;
|
||
int c;
|
||
|
||
if (argc < 2) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " option ?arg arg ...?\"", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
Tcl_Preserve((ClientData) scrollPtr);
|
||
c = argv[1][0];
|
||
length = strlen(argv[1]);
|
||
if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)) {
|
||
if (argc == 2) {
|
||
switch (scrollPtr->activeField) {
|
||
case TOP_ARROW: interp->result = "arrow1"; break;
|
||
case SLIDER: interp->result = "slider"; break;
|
||
case BOTTOM_ARROW: interp->result = "arrow2"; break;
|
||
}
|
||
goto done;
|
||
}
|
||
if (argc != 3) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " activate element\"", (char *) NULL);
|
||
goto error;
|
||
}
|
||
c = argv[2][0];
|
||
length = strlen(argv[2]);
|
||
if ((c == 'a') && (strcmp(argv[2], "arrow1") == 0)) {
|
||
scrollPtr->activeField = TOP_ARROW;
|
||
} else if ((c == 'a') && (strcmp(argv[2], "arrow2") == 0)) {
|
||
scrollPtr->activeField = BOTTOM_ARROW;
|
||
} else if ((c == 's') && (strncmp(argv[2], "slider", length) == 0)) {
|
||
scrollPtr->activeField = SLIDER;
|
||
} else {
|
||
scrollPtr->activeField = OUTSIDE;
|
||
}
|
||
EventuallyRedraw(scrollPtr);
|
||
} else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
|
||
&& (length >= 2)) {
|
||
if (argc != 3) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " cget option\"",
|
||
(char *) NULL);
|
||
goto error;
|
||
}
|
||
result = Tk_ConfigureValue(interp, scrollPtr->tkwin, configSpecs,
|
||
(char *) scrollPtr, argv[2], 0);
|
||
} else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
|
||
&& (length >= 2)) {
|
||
if (argc == 2) {
|
||
result = Tk_ConfigureInfo(interp, scrollPtr->tkwin, configSpecs,
|
||
(char *) scrollPtr, (char *) NULL, 0);
|
||
} else if (argc == 3) {
|
||
result = Tk_ConfigureInfo(interp, scrollPtr->tkwin, configSpecs,
|
||
(char *) scrollPtr, argv[2], 0);
|
||
} else {
|
||
result = ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2,
|
||
TK_CONFIG_ARGV_ONLY);
|
||
}
|
||
} else if ((c == 'd') && (strncmp(argv[1], "delta", length) == 0)) {
|
||
int xDelta, yDelta, pixels, length;
|
||
double fraction;
|
||
|
||
if (argc != 4) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " delta xDelta yDelta\"", (char *) NULL);
|
||
goto error;
|
||
}
|
||
if ((Tcl_GetInt(interp, argv[2], &xDelta) != TCL_OK)
|
||
|| (Tcl_GetInt(interp, argv[3], &yDelta) != TCL_OK)) {
|
||
goto error;
|
||
}
|
||
if (scrollPtr->vertical) {
|
||
pixels = yDelta;
|
||
length = Tk_Height(scrollPtr->tkwin) - 1
|
||
- 2*(scrollPtr->arrowLength + scrollPtr->inset);
|
||
} else {
|
||
pixels = xDelta;
|
||
length = Tk_Width(scrollPtr->tkwin) - 1
|
||
- 2*(scrollPtr->arrowLength + scrollPtr->inset);
|
||
}
|
||
if (length == 0) {
|
||
fraction = 0.0;
|
||
} else {
|
||
fraction = ((double) pixels / (double) length);
|
||
}
|
||
sprintf(interp->result, "%g", fraction);
|
||
} else if ((c == 'f') && (strncmp(argv[1], "fraction", length) == 0)) {
|
||
int x, y, pos, length;
|
||
double fraction;
|
||
|
||
if (argc != 4) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " fraction x y\"", (char *) NULL);
|
||
goto error;
|
||
}
|
||
if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
|
||
|| (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
|
||
goto error;
|
||
}
|
||
if (scrollPtr->vertical) {
|
||
pos = y - (scrollPtr->arrowLength + scrollPtr->inset);
|
||
length = Tk_Height(scrollPtr->tkwin) - 1
|
||
- 2*(scrollPtr->arrowLength + scrollPtr->inset);
|
||
} else {
|
||
pos = x - (scrollPtr->arrowLength + scrollPtr->inset);
|
||
length = Tk_Width(scrollPtr->tkwin) - 1
|
||
- 2*(scrollPtr->arrowLength + scrollPtr->inset);
|
||
}
|
||
if (length == 0) {
|
||
fraction = 0.0;
|
||
} else {
|
||
fraction = ((double) pos / (double) length);
|
||
}
|
||
if (fraction < 0) {
|
||
fraction = 0;
|
||
} else if (fraction > 1.0) {
|
||
fraction = 1.0;
|
||
}
|
||
sprintf(interp->result, "%g", fraction);
|
||
} else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
|
||
if (argc != 2) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " get\"", (char *) NULL);
|
||
goto error;
|
||
}
|
||
if (scrollPtr->flags & NEW_STYLE_COMMANDS) {
|
||
char first[TCL_DOUBLE_SPACE], last[TCL_DOUBLE_SPACE];
|
||
|
||
Tcl_PrintDouble(interp, scrollPtr->firstFraction, first);
|
||
Tcl_PrintDouble(interp, scrollPtr->lastFraction, last);
|
||
Tcl_AppendResult(interp, first, " ", last, (char *) NULL);
|
||
} else {
|
||
sprintf(interp->result, "%d %d %d %d", scrollPtr->totalUnits,
|
||
scrollPtr->windowUnits, scrollPtr->firstUnit,
|
||
scrollPtr->lastUnit);
|
||
}
|
||
} else if ((c == 'i') && (strncmp(argv[1], "identify", length) == 0)) {
|
||
int x, y, thing;
|
||
|
||
if (argc != 4) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " identify x y\"", (char *) NULL);
|
||
goto error;
|
||
}
|
||
if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
|
||
|| (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
|
||
goto error;
|
||
}
|
||
thing = ScrollbarPosition(scrollPtr, x,y);
|
||
switch (thing) {
|
||
case TOP_ARROW: interp->result = "arrow1"; break;
|
||
case TOP_GAP: interp->result = "trough1"; break;
|
||
case SLIDER: interp->result = "slider"; break;
|
||
case BOTTOM_GAP: interp->result = "trough2"; break;
|
||
case BOTTOM_ARROW: interp->result = "arrow2"; break;
|
||
}
|
||
} else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {
|
||
int totalUnits, windowUnits, firstUnit, lastUnit;
|
||
|
||
if (argc == 4) {
|
||
double first, last;
|
||
|
||
if (Tcl_GetDouble(interp, argv[2], &first) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
if (Tcl_GetDouble(interp, argv[3], &last) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
if (first < 0) {
|
||
scrollPtr->firstFraction = 0;
|
||
} else if (first > 1.0) {
|
||
scrollPtr->firstFraction = 1.0;
|
||
} else {
|
||
scrollPtr->firstFraction = first;
|
||
}
|
||
if (last < scrollPtr->firstFraction) {
|
||
scrollPtr->lastFraction = scrollPtr->firstFraction;
|
||
} else if (last > 1.0) {
|
||
scrollPtr->lastFraction = 1.0;
|
||
} else {
|
||
scrollPtr->lastFraction = last;
|
||
}
|
||
scrollPtr->flags |= NEW_STYLE_COMMANDS;
|
||
} else if (argc == 6) {
|
||
if (Tcl_GetInt(interp, argv[2], &totalUnits) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
if (totalUnits < 0) {
|
||
totalUnits = 0;
|
||
}
|
||
if (Tcl_GetInt(interp, argv[3], &windowUnits) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
if (windowUnits < 0) {
|
||
windowUnits = 0;
|
||
}
|
||
if (Tcl_GetInt(interp, argv[4], &firstUnit) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
if (Tcl_GetInt(interp, argv[5], &lastUnit) != TCL_OK) {
|
||
goto error;
|
||
}
|
||
if (totalUnits > 0) {
|
||
if (lastUnit < firstUnit) {
|
||
lastUnit = firstUnit;
|
||
}
|
||
} else {
|
||
firstUnit = lastUnit = 0;
|
||
}
|
||
scrollPtr->totalUnits = totalUnits;
|
||
scrollPtr->windowUnits = windowUnits;
|
||
scrollPtr->firstUnit = firstUnit;
|
||
scrollPtr->lastUnit = lastUnit;
|
||
if (scrollPtr->totalUnits == 0) {
|
||
scrollPtr->firstFraction = 0.0;
|
||
scrollPtr->lastFraction = 1.0;
|
||
} else {
|
||
scrollPtr->firstFraction = ((double) firstUnit)/totalUnits;
|
||
scrollPtr->lastFraction = ((double) (lastUnit+1))/totalUnits;
|
||
}
|
||
scrollPtr->flags &= ~NEW_STYLE_COMMANDS;
|
||
} else {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " set firstFraction lastFraction\" or \"",
|
||
argv[0],
|
||
" set totalUnits windowUnits firstUnit lastUnit\"",
|
||
(char *) NULL);
|
||
goto error;
|
||
}
|
||
ComputeScrollbarGeometry(scrollPtr);
|
||
EventuallyRedraw(scrollPtr);
|
||
} else {
|
||
Tcl_AppendResult(interp, "bad option \"", argv[1],
|
||
"\": must be activate, cget, configure, delta, fraction, ",
|
||
"get, identify, or set", (char *) NULL);
|
||
goto error;
|
||
}
|
||
done:
|
||
Tcl_Release((ClientData) scrollPtr);
|
||
return result;
|
||
|
||
error:
|
||
Tcl_Release((ClientData) scrollPtr);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* DestroyScrollbar --
|
||
*
|
||
* This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
|
||
* to clean up the internal structure of a scrollbar at a safe time
|
||
* (when no-one is using it anymore).
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Everything associated with the scrollbar is freed up.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DestroyScrollbar(memPtr)
|
||
char *memPtr; /* Info about scrollbar widget. */
|
||
{
|
||
register Scrollbar *scrollPtr = (Scrollbar *) memPtr;
|
||
|
||
/*
|
||
* Free up all the stuff that requires special handling, then
|
||
* let Tk_FreeOptions handle all the standard option-related
|
||
* stuff.
|
||
*/
|
||
|
||
if (scrollPtr->troughGC != None) {
|
||
Tk_FreeGC(scrollPtr->display, scrollPtr->troughGC);
|
||
}
|
||
if (scrollPtr->copyGC != None) {
|
||
Tk_FreeGC(scrollPtr->display, scrollPtr->copyGC);
|
||
}
|
||
Tk_FreeOptions(configSpecs, (char *) scrollPtr, scrollPtr->display, 0);
|
||
ckfree((char *) scrollPtr);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ConfigureScrollbar --
|
||
*
|
||
* This procedure is called to process an argv/argc list, plus
|
||
* the Tk option database, in order to configure (or
|
||
* reconfigure) a scrollbar widget.
|
||
*
|
||
* Results:
|
||
* The return value is a standard Tcl result. If TCL_ERROR is
|
||
* returned, then interp->result contains an error message.
|
||
*
|
||
* Side effects:
|
||
* Configuration information, such as colors, border width,
|
||
* etc. get set for scrollPtr; old resources get freed,
|
||
* if there were any.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
ConfigureScrollbar(interp, scrollPtr, argc, argv, flags)
|
||
Tcl_Interp *interp; /* Used for error reporting. */
|
||
register Scrollbar *scrollPtr; /* Information about widget; may or
|
||
* may not already have values for
|
||
* some fields. */
|
||
int argc; /* Number of valid entries in argv. */
|
||
char **argv; /* Arguments. */
|
||
int flags; /* Flags to pass to
|
||
* Tk_ConfigureWidget. */
|
||
{
|
||
size_t length;
|
||
XGCValues gcValues;
|
||
GC new;
|
||
|
||
if (Tk_ConfigureWidget(interp, scrollPtr->tkwin, configSpecs,
|
||
argc, argv, (char *) scrollPtr, flags) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* A few options need special processing, such as parsing the
|
||
* orientation or setting the background from a 3-D border.
|
||
*/
|
||
|
||
length = strlen(scrollPtr->orientUid);
|
||
if (strncmp(scrollPtr->orientUid, "vertical", length) == 0) {
|
||
scrollPtr->vertical = 1;
|
||
} else if (strncmp(scrollPtr->orientUid, "horizontal", length) == 0) {
|
||
scrollPtr->vertical = 0;
|
||
} else {
|
||
Tcl_AppendResult(interp, "bad orientation \"", scrollPtr->orientUid,
|
||
"\": must be vertical or horizontal", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
if (scrollPtr->command != NULL) {
|
||
scrollPtr->commandSize = strlen(scrollPtr->command);
|
||
} else {
|
||
scrollPtr->commandSize = 0;
|
||
}
|
||
|
||
Tk_SetBackgroundFromBorder(scrollPtr->tkwin, scrollPtr->bgBorder);
|
||
|
||
gcValues.foreground = scrollPtr->troughColorPtr->pixel;
|
||
new = Tk_GetGC(scrollPtr->tkwin, GCForeground, &gcValues);
|
||
if (scrollPtr->troughGC != None) {
|
||
Tk_FreeGC(scrollPtr->display, scrollPtr->troughGC);
|
||
}
|
||
scrollPtr->troughGC = new;
|
||
if (scrollPtr->copyGC == None) {
|
||
gcValues.graphics_exposures = False;
|
||
scrollPtr->copyGC = Tk_GetGC(scrollPtr->tkwin, GCGraphicsExposures,
|
||
&gcValues);
|
||
}
|
||
|
||
/*
|
||
* Register the desired geometry for the window (leave enough space
|
||
* for the two arrows plus a minimum-size slider, plus border around
|
||
* the whole window, if any). Then arrange for the window to be
|
||
* redisplayed.
|
||
*/
|
||
|
||
ComputeScrollbarGeometry(scrollPtr);
|
||
EventuallyRedraw(scrollPtr);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DisplayScrollbar --
|
||
*
|
||
* This procedure redraws the contents of a scrollbar window.
|
||
* It is invoked as a do-when-idle handler, so it only runs
|
||
* when there's nothing else for the application to do.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Information appears on the screen.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayScrollbar(clientData)
|
||
ClientData clientData; /* Information about window. */
|
||
{
|
||
register Scrollbar *scrollPtr = (Scrollbar *) clientData;
|
||
register Tk_Window tkwin = scrollPtr->tkwin;
|
||
XPoint points[7];
|
||
Tk_3DBorder border;
|
||
int relief, width, elementBorderWidth;
|
||
Pixmap pixmap;
|
||
|
||
if ((scrollPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
|
||
goto done;
|
||
}
|
||
|
||
if (scrollPtr->vertical) {
|
||
width = Tk_Width(tkwin) - 2*scrollPtr->inset;
|
||
} else {
|
||
width = Tk_Height(tkwin) - 2*scrollPtr->inset;
|
||
}
|
||
elementBorderWidth = scrollPtr->elementBorderWidth;
|
||
if (elementBorderWidth < 0) {
|
||
elementBorderWidth = scrollPtr->borderWidth;
|
||
}
|
||
|
||
/*
|
||
* In order to avoid screen flashes, this procedure redraws
|
||
* the scrollbar in a pixmap, then copies the pixmap to the
|
||
* screen in a single operation. This means that there's no
|
||
* point in time where the on-sreen image has been cleared.
|
||
*/
|
||
|
||
pixmap = Tk_GetPixmap(scrollPtr->display, Tk_WindowId(tkwin),
|
||
Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
|
||
|
||
if (scrollPtr->highlightWidth != 0) {
|
||
GC gc;
|
||
|
||
if (scrollPtr->flags & GOT_FOCUS) {
|
||
gc = Tk_GCForColor(scrollPtr->highlightColorPtr, pixmap);
|
||
} else {
|
||
gc = Tk_GCForColor(scrollPtr->highlightBgColorPtr, pixmap);
|
||
}
|
||
Tk_DrawFocusHighlight(tkwin, gc, scrollPtr->highlightWidth, pixmap);
|
||
}
|
||
Tk_Draw3DRectangle(tkwin, pixmap, scrollPtr->bgBorder,
|
||
scrollPtr->highlightWidth, scrollPtr->highlightWidth,
|
||
Tk_Width(tkwin) - 2*scrollPtr->highlightWidth,
|
||
Tk_Height(tkwin) - 2*scrollPtr->highlightWidth,
|
||
scrollPtr->borderWidth, scrollPtr->relief);
|
||
XFillRectangle(scrollPtr->display, pixmap, scrollPtr->troughGC,
|
||
scrollPtr->inset, scrollPtr->inset,
|
||
(unsigned) (Tk_Width(tkwin) - 2*scrollPtr->inset),
|
||
(unsigned) (Tk_Height(tkwin) - 2*scrollPtr->inset));
|
||
|
||
/*
|
||
* Draw the top or left arrow. The coordinates of the polygon
|
||
* points probably seem odd, but they were carefully chosen with
|
||
* respect to X's rules for filling polygons. These point choices
|
||
* cause the arrows to just fill the narrow dimension of the
|
||
* scrollbar and be properly centered.
|
||
*/
|
||
|
||
if (scrollPtr->activeField == TOP_ARROW) {
|
||
border = scrollPtr->activeBorder;
|
||
relief = scrollPtr->activeField == TOP_ARROW ? scrollPtr->activeRelief
|
||
: TK_RELIEF_RAISED;
|
||
} else {
|
||
border = scrollPtr->bgBorder;
|
||
relief = TK_RELIEF_RAISED;
|
||
}
|
||
if (scrollPtr->vertical) {
|
||
points[0].x = scrollPtr->inset - 1;
|
||
points[0].y = scrollPtr->arrowLength + scrollPtr->inset - 1;
|
||
points[1].x = width + scrollPtr->inset;
|
||
points[1].y = points[0].y;
|
||
points[2].x = width/2 + scrollPtr->inset;
|
||
points[2].y = scrollPtr->inset - 1;
|
||
Tk_Fill3DPolygon(tkwin, pixmap, border, points, 3,
|
||
elementBorderWidth, relief);
|
||
} else {
|
||
points[0].x = scrollPtr->arrowLength + scrollPtr->inset - 1;
|
||
points[0].y = scrollPtr->inset - 1;
|
||
points[1].x = scrollPtr->inset;
|
||
points[1].y = width/2 + scrollPtr->inset;
|
||
points[2].x = points[0].x;
|
||
points[2].y = width + scrollPtr->inset;
|
||
Tk_Fill3DPolygon(tkwin, pixmap, border, points, 3,
|
||
elementBorderWidth, relief);
|
||
}
|
||
|
||
/*
|
||
* Display the bottom or right arrow.
|
||
*/
|
||
|
||
if (scrollPtr->activeField == BOTTOM_ARROW) {
|
||
border = scrollPtr->activeBorder;
|
||
relief = scrollPtr->activeField == BOTTOM_ARROW
|
||
? scrollPtr->activeRelief : TK_RELIEF_RAISED;
|
||
} else {
|
||
border = scrollPtr->bgBorder;
|
||
relief = TK_RELIEF_RAISED;
|
||
}
|
||
if (scrollPtr->vertical) {
|
||
points[0].x = scrollPtr->inset;
|
||
points[0].y = Tk_Height(tkwin) - scrollPtr->arrowLength
|
||
- scrollPtr->inset + 1;
|
||
points[1].x = width/2 + scrollPtr->inset;
|
||
points[1].y = Tk_Height(tkwin) - scrollPtr->inset;
|
||
points[2].x = width + scrollPtr->inset;
|
||
points[2].y = points[0].y;
|
||
Tk_Fill3DPolygon(tkwin, pixmap, border,
|
||
points, 3, elementBorderWidth, relief);
|
||
} else {
|
||
points[0].x = Tk_Width(tkwin) - scrollPtr->arrowLength
|
||
- scrollPtr->inset + 1;
|
||
points[0].y = scrollPtr->inset - 1;
|
||
points[1].x = points[0].x;
|
||
points[1].y = width + scrollPtr->inset;
|
||
points[2].x = Tk_Width(tkwin) - scrollPtr->inset;
|
||
points[2].y = width/2 + scrollPtr->inset;
|
||
Tk_Fill3DPolygon(tkwin, pixmap, border,
|
||
points, 3, elementBorderWidth, relief);
|
||
}
|
||
|
||
/*
|
||
* Display the slider.
|
||
*/
|
||
|
||
if (scrollPtr->activeField == SLIDER) {
|
||
border = scrollPtr->activeBorder;
|
||
relief = scrollPtr->activeField == SLIDER ? scrollPtr->activeRelief
|
||
: TK_RELIEF_RAISED;
|
||
} else {
|
||
border = scrollPtr->bgBorder;
|
||
relief = TK_RELIEF_RAISED;
|
||
}
|
||
if (scrollPtr->vertical) {
|
||
Tk_Fill3DRectangle(tkwin, pixmap, border,
|
||
scrollPtr->inset, scrollPtr->sliderFirst,
|
||
width, scrollPtr->sliderLast - scrollPtr->sliderFirst,
|
||
elementBorderWidth, relief);
|
||
} else {
|
||
Tk_Fill3DRectangle(tkwin, pixmap, border,
|
||
scrollPtr->sliderFirst, scrollPtr->inset,
|
||
scrollPtr->sliderLast - scrollPtr->sliderFirst, width,
|
||
elementBorderWidth, relief);
|
||
}
|
||
|
||
/*
|
||
* Copy the information from the off-screen pixmap onto the screen,
|
||
* then delete the pixmap.
|
||
*/
|
||
|
||
XCopyArea(scrollPtr->display, pixmap, Tk_WindowId(tkwin),
|
||
scrollPtr->copyGC, 0, 0, (unsigned) Tk_Width(tkwin),
|
||
(unsigned) Tk_Height(tkwin), 0, 0);
|
||
Tk_FreePixmap(scrollPtr->display, pixmap);
|
||
|
||
done:
|
||
scrollPtr->flags &= ~REDRAW_PENDING;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScrollbarEventProc --
|
||
*
|
||
* This procedure is invoked by the Tk dispatcher for various
|
||
* events on scrollbars.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* When the window gets deleted, internal structures get
|
||
* cleaned up. When it gets exposed, it is redisplayed.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ScrollbarEventProc(clientData, eventPtr)
|
||
ClientData clientData; /* Information about window. */
|
||
XEvent *eventPtr; /* Information about event. */
|
||
{
|
||
Scrollbar *scrollPtr = (Scrollbar *) clientData;
|
||
|
||
if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
|
||
EventuallyRedraw(scrollPtr);
|
||
} else if (eventPtr->type == DestroyNotify) {
|
||
if (scrollPtr->tkwin != NULL) {
|
||
scrollPtr->tkwin = NULL;
|
||
Tcl_DeleteCommand(scrollPtr->interp,
|
||
Tcl_GetCommandName(scrollPtr->interp,
|
||
scrollPtr->widgetCmd));
|
||
}
|
||
if (scrollPtr->flags & REDRAW_PENDING) {
|
||
Tcl_CancelIdleCall(DisplayScrollbar, (ClientData) scrollPtr);
|
||
}
|
||
Tcl_EventuallyFree((ClientData) scrollPtr, DestroyScrollbar);
|
||
} else if (eventPtr->type == ConfigureNotify) {
|
||
ComputeScrollbarGeometry(scrollPtr);
|
||
EventuallyRedraw(scrollPtr);
|
||
} else if (eventPtr->type == FocusIn) {
|
||
if (eventPtr->xfocus.detail != NotifyInferior) {
|
||
scrollPtr->flags |= GOT_FOCUS;
|
||
if (scrollPtr->highlightWidth > 0) {
|
||
EventuallyRedraw(scrollPtr);
|
||
}
|
||
}
|
||
} else if (eventPtr->type == FocusOut) {
|
||
if (eventPtr->xfocus.detail != NotifyInferior) {
|
||
scrollPtr->flags &= ~GOT_FOCUS;
|
||
if (scrollPtr->highlightWidth > 0) {
|
||
EventuallyRedraw(scrollPtr);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ScrollbarCmdDeletedProc --
|
||
*
|
||
* This procedure is invoked when a widget command is deleted. If
|
||
* the widget isn't already in the process of being destroyed,
|
||
* this command destroys it.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The widget is destroyed.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ScrollbarCmdDeletedProc(clientData)
|
||
ClientData clientData; /* Pointer to widget record for widget. */
|
||
{
|
||
Scrollbar *scrollPtr = (Scrollbar *) clientData;
|
||
Tk_Window tkwin = scrollPtr->tkwin;
|
||
|
||
/*
|
||
* This procedure could be invoked either because the window was
|
||
* destroyed and the command was then deleted (in which case tkwin
|
||
* is NULL) or because the command was deleted, and then this procedure
|
||
* destroys the widget.
|
||
*/
|
||
|
||
if (tkwin != NULL) {
|
||
scrollPtr->tkwin = NULL;
|
||
Tk_DestroyWindow(tkwin);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ComputeScrollbarGeometry --
|
||
*
|
||
* After changes in a scrollbar's size or configuration, this
|
||
* procedure recomputes various geometry information used in
|
||
* displaying the scrollbar.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The scrollbar will be displayed differently.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ComputeScrollbarGeometry(scrollPtr)
|
||
register Scrollbar *scrollPtr; /* Scrollbar whose geometry may
|
||
* have changed. */
|
||
{
|
||
int width, fieldLength;
|
||
|
||
if (scrollPtr->highlightWidth < 0) {
|
||
scrollPtr->highlightWidth = 0;
|
||
}
|
||
scrollPtr->inset = scrollPtr->highlightWidth + scrollPtr->borderWidth;
|
||
width = (scrollPtr->vertical) ? Tk_Width(scrollPtr->tkwin)
|
||
: Tk_Height(scrollPtr->tkwin);
|
||
scrollPtr->arrowLength = width - 2*scrollPtr->inset + 1;
|
||
fieldLength = (scrollPtr->vertical ? Tk_Height(scrollPtr->tkwin)
|
||
: Tk_Width(scrollPtr->tkwin))
|
||
- 2*(scrollPtr->arrowLength + scrollPtr->inset);
|
||
if (fieldLength < 0) {
|
||
fieldLength = 0;
|
||
}
|
||
scrollPtr->sliderFirst = fieldLength*scrollPtr->firstFraction;
|
||
scrollPtr->sliderLast = fieldLength*scrollPtr->lastFraction;
|
||
|
||
/*
|
||
* Adjust the slider so that some piece of it is always
|
||
* displayed in the scrollbar and so that it has at least
|
||
* a minimal width (so it can be grabbed with the mouse).
|
||
*/
|
||
|
||
if (scrollPtr->sliderFirst > (fieldLength - 2*scrollPtr->borderWidth)) {
|
||
scrollPtr->sliderFirst = fieldLength - 2*scrollPtr->borderWidth;
|
||
}
|
||
if (scrollPtr->sliderFirst < 0) {
|
||
scrollPtr->sliderFirst = 0;
|
||
}
|
||
if (scrollPtr->sliderLast < (scrollPtr->sliderFirst
|
||
+ MIN_SLIDER_LENGTH)) {
|
||
scrollPtr->sliderLast = scrollPtr->sliderFirst + MIN_SLIDER_LENGTH;
|
||
}
|
||
if (scrollPtr->sliderLast > fieldLength) {
|
||
scrollPtr->sliderLast = fieldLength;
|
||
}
|
||
scrollPtr->sliderFirst += scrollPtr->arrowLength + scrollPtr->inset;
|
||
scrollPtr->sliderLast += scrollPtr->arrowLength + scrollPtr->inset;
|
||
|
||
/*
|
||
* Register the desired geometry for the window (leave enough space
|
||
* for the two arrows plus a minimum-size slider, plus border around
|
||
* the whole window, if any). Then arrange for the window to be
|
||
* redisplayed.
|
||
*/
|
||
|
||
if (scrollPtr->vertical) {
|
||
Tk_GeometryRequest(scrollPtr->tkwin,
|
||
scrollPtr->width + 2*scrollPtr->inset,
|
||
2*(scrollPtr->arrowLength + scrollPtr->borderWidth
|
||
+ scrollPtr->inset));
|
||
} else {
|
||
Tk_GeometryRequest(scrollPtr->tkwin,
|
||
2*(scrollPtr->arrowLength + scrollPtr->borderWidth
|
||
+ scrollPtr->inset), scrollPtr->width + 2*scrollPtr->inset);
|
||
}
|
||
Tk_SetInternalBorder(scrollPtr->tkwin, scrollPtr->inset);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ScrollbarPosition --
|
||
*
|
||
* Determine the scrollbar element corresponding to a
|
||
* given position.
|
||
*
|
||
* Results:
|
||
* One of TOP_ARROW, TOP_GAP, etc., indicating which element
|
||
* of the scrollbar covers the position given by (x, y). If
|
||
* (x,y) is outside the scrollbar entirely, then OUTSIDE is
|
||
* returned.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
ScrollbarPosition(scrollPtr, x, y)
|
||
register Scrollbar *scrollPtr; /* Scrollbar widget record. */
|
||
int x, y; /* Coordinates within scrollPtr's
|
||
* window. */
|
||
{
|
||
int length, width, tmp;
|
||
|
||
if (scrollPtr->vertical) {
|
||
length = Tk_Height(scrollPtr->tkwin);
|
||
width = Tk_Width(scrollPtr->tkwin);
|
||
} else {
|
||
tmp = x;
|
||
x = y;
|
||
y = tmp;
|
||
length = Tk_Width(scrollPtr->tkwin);
|
||
width = Tk_Height(scrollPtr->tkwin);
|
||
}
|
||
|
||
if ((x < scrollPtr->inset) || (x >= (width - scrollPtr->inset))
|
||
|| (y < scrollPtr->inset) || (y >= (length - scrollPtr->inset))) {
|
||
return OUTSIDE;
|
||
}
|
||
|
||
/*
|
||
* All of the calculations in this procedure mirror those in
|
||
* DisplayScrollbar. Be sure to keep the two consistent.
|
||
*/
|
||
|
||
if (y < (scrollPtr->inset + scrollPtr->arrowLength)) {
|
||
return TOP_ARROW;
|
||
}
|
||
if (y < scrollPtr->sliderFirst) {
|
||
return TOP_GAP;
|
||
}
|
||
if (y < scrollPtr->sliderLast) {
|
||
return SLIDER;
|
||
}
|
||
if (y >= (length - (scrollPtr->arrowLength + scrollPtr->inset))) {
|
||
return BOTTOM_ARROW;
|
||
}
|
||
return BOTTOM_GAP;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* EventuallyRedraw --
|
||
*
|
||
* Arrange for one or more of the fields of a scrollbar
|
||
* to be redrawn.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
EventuallyRedraw(scrollPtr)
|
||
register Scrollbar *scrollPtr; /* Information about widget. */
|
||
{
|
||
if ((scrollPtr->tkwin == NULL) || (!Tk_IsMapped(scrollPtr->tkwin))) {
|
||
return;
|
||
}
|
||
if ((scrollPtr->flags & REDRAW_PENDING) == 0) {
|
||
Tcl_DoWhenIdle(DisplayScrollbar, (ClientData) scrollPtr);
|
||
scrollPtr->flags |= REDRAW_PENDING;
|
||
}
|
||
}
|