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markom |
# scrlbar.tcl --
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#
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# This file defines the default bindings for Tk scrollbar widgets.
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# It also provides procedures that help in implementing the bindings.
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#
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# SCCS: @(#) scrlbar.tcl 1.26 96/11/30 17:19:16
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#
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# Copyright (c) 1994 The Regents of the University of California.
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# Copyright (c) 1994-1996 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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#-------------------------------------------------------------------------
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# The code below creates the default class bindings for scrollbars.
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#-------------------------------------------------------------------------
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# Standard Motif bindings:
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if {($tcl_platform(platform) != "windows") &&
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($tcl_platform(platform) != "macintosh")} {
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bind Scrollbar <Enter> {
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if {$tk_strictMotif} {
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set tkPriv(activeBg) [%W cget -activebackground]
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%W config -activebackground [%W cget -background]
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}
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%W activate [%W identify %x %y]
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}
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bind Scrollbar <Motion> {
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%W activate [%W identify %x %y]
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}
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# The "info exists" command in the following binding handles the
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# situation where a Leave event occurs for a scrollbar without the Enter
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# event. This seems to happen on some systems (such as Solaris 2.4) for
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# unknown reasons.
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bind Scrollbar <Leave> {
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if {$tk_strictMotif && [info exists tkPriv(activeBg)]} {
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%W config -activebackground $tkPriv(activeBg)
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}
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%W activate {}
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}
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bind Scrollbar <1> {
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tkScrollButtonDown %W %x %y
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}
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bind Scrollbar <B1-Motion> {
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tkScrollDrag %W %x %y
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}
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bind Scrollbar <B1-B2-Motion> {
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tkScrollDrag %W %x %y
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}
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bind Scrollbar <ButtonRelease-1> {
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tkScrollButtonUp %W %x %y
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}
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bind Scrollbar <B1-Leave> {
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# Prevents <Leave> binding from being invoked.
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}
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bind Scrollbar <B1-Enter> {
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# Prevents <Enter> binding from being invoked.
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}
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bind Scrollbar <2> {
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tkScrollButton2Down %W %x %y
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}
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bind Scrollbar <B1-2> {
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# Do nothing, since button 1 is already down.
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}
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bind Scrollbar <B2-1> {
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# Do nothing, since button 2 is already down.
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}
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bind Scrollbar <B2-Motion> {
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tkScrollDrag %W %x %y
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}
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bind Scrollbar <ButtonRelease-2> {
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tkScrollButtonUp %W %x %y
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}
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bind Scrollbar <B1-ButtonRelease-2> {
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# Do nothing: B1 release will handle it.
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}
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bind Scrollbar <B2-ButtonRelease-1> {
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# Do nothing: B2 release will handle it.
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}
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bind Scrollbar <B2-Leave> {
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# Prevents <Leave> binding from being invoked.
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}
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bind Scrollbar <B2-Enter> {
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# Prevents <Enter> binding from being invoked.
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}
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bind Scrollbar <Control-1> {
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tkScrollTopBottom %W %x %y
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}
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bind Scrollbar <Control-2> {
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tkScrollTopBottom %W %x %y
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}
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bind Scrollbar <Up> {
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tkScrollByUnits %W v -1
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}
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bind Scrollbar <Down> {
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tkScrollByUnits %W v 1
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}
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bind Scrollbar <Control-Up> {
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tkScrollByPages %W v -1
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}
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bind Scrollbar <Control-Down> {
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tkScrollByPages %W v 1
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}
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bind Scrollbar <Left> {
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tkScrollByUnits %W h -1
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}
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bind Scrollbar <Right> {
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tkScrollByUnits %W h 1
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}
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bind Scrollbar <Control-Left> {
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tkScrollByPages %W h -1
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}
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bind Scrollbar <Control-Right> {
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tkScrollByPages %W h 1
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}
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bind Scrollbar <Prior> {
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tkScrollByPages %W hv -1
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}
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bind Scrollbar <Next> {
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tkScrollByPages %W hv 1
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}
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bind Scrollbar <Home> {
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tkScrollToPos %W 0
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}
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bind Scrollbar <End> {
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tkScrollToPos %W 1
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}
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}
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# tkScrollButtonDown --
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# This procedure is invoked when a button is pressed in a scrollbar.
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# It changes the way the scrollbar is displayed and takes actions
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# depending on where the mouse is.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - Mouse coordinates.
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proc tkScrollButtonDown {w x y} {
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global tkPriv
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set tkPriv(relief) [$w cget -activerelief]
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$w configure -activerelief sunken
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set element [$w identify $x $y]
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if {$element == "slider"} {
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tkScrollStartDrag $w $x $y
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} else {
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tkScrollSelect $w $element initial
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}
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}
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# tkScrollButtonUp --
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# This procedure is invoked when a button is released in a scrollbar.
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# It cancels scans and auto-repeats that were in progress, and restores
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# the way the active element is displayed.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - Mouse coordinates.
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proc tkScrollButtonUp {w x y} {
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global tkPriv
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tkCancelRepeat
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$w configure -activerelief $tkPriv(relief)
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tkScrollEndDrag $w $x $y
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$w activate [$w identify $x $y]
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}
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# tkScrollSelect --
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# This procedure is invoked when a button is pressed over the scrollbar.
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# It invokes one of several scrolling actions depending on where in
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# the scrollbar the button was pressed.
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#
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# Arguments:
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# w - The scrollbar widget.
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# element - The element of the scrollbar that was selected, such
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# as "arrow1" or "trough2". Shouldn't be "slider".
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# repeat - Whether and how to auto-repeat the action: "noRepeat"
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# means don't auto-repeat, "initial" means this is the
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# first action in an auto-repeat sequence, and "again"
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# means this is the second repetition or later.
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proc tkScrollSelect {w element repeat} {
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global tkPriv
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if {![winfo exists $w]} return
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if {$element == "arrow1"} {
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tkScrollByUnits $w hv -1
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} elseif {$element == "trough1"} {
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tkScrollByPages $w hv -1
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} elseif {$element == "trough2"} {
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tkScrollByPages $w hv 1
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} elseif {$element == "arrow2"} {
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tkScrollByUnits $w hv 1
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} else {
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return
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}
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if {$repeat == "again"} {
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set tkPriv(afterId) [after [$w cget -repeatinterval] \
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tkScrollSelect $w $element again]
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} elseif {$repeat == "initial"} {
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set delay [$w cget -repeatdelay]
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if {$delay > 0} {
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set tkPriv(afterId) [after $delay tkScrollSelect $w $element again]
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}
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}
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}
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# tkScrollStartDrag --
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# This procedure is called to initiate a drag of the slider. It just
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# remembers the starting position of the mouse and slider.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - The mouse position at the start of the drag operation.
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proc tkScrollStartDrag {w x y} {
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global tkPriv
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if {[$w cget -command] == ""} {
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return
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}
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set tkPriv(pressX) $x
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set tkPriv(pressY) $y
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set tkPriv(initValues) [$w get]
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set iv0 [lindex $tkPriv(initValues) 0]
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if {[llength $tkPriv(initValues)] == 2} {
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set tkPriv(initPos) $iv0
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} else {
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if {$iv0 == 0} {
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set tkPriv(initPos) 0.0
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} else {
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set tkPriv(initPos) [expr {(double([lindex $tkPriv(initValues) 2])) \
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/ [lindex $tkPriv(initValues) 0]}]
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}
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}
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}
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# tkScrollDrag --
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# This procedure is called for each mouse motion even when the slider
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# is being dragged. It notifies the associated widget if we're not
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# jump scrolling, and it just updates the scrollbar if we are jump
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# scrolling.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - The current mouse position.
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proc tkScrollDrag {w x y} {
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global tkPriv
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if {$tkPriv(initPos) == ""} {
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return
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}
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set delta [$w delta [expr {$x - $tkPriv(pressX)}] [expr {$y - $tkPriv(pressY)}]]
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if {[$w cget -jump]} {
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if {[llength $tkPriv(initValues)] == 2} {
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$w set [expr {[lindex $tkPriv(initValues) 0] + $delta}] \
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[expr {[lindex $tkPriv(initValues) 1] + $delta}]
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} else {
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set delta [expr {round($delta * [lindex $tkPriv(initValues) 0])}]
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eval $w set [lreplace $tkPriv(initValues) 2 3 \
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[expr {[lindex $tkPriv(initValues) 2] + $delta}] \
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[expr {[lindex $tkPriv(initValues) 3] + $delta}]]
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}
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} else {
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tkScrollToPos $w [expr {$tkPriv(initPos) + $delta}]
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}
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}
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# tkScrollEndDrag --
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# This procedure is called to end an interactive drag of the slider.
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# It scrolls the window if we're in jump mode, otherwise it does nothing.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - The mouse position at the end of the drag operation.
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proc tkScrollEndDrag {w x y} {
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global tkPriv
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if {$tkPriv(initPos) == ""} {
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return
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}
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if {[$w cget -jump]} {
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set delta [$w delta [expr {$x - $tkPriv(pressX)}] \
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[expr {$y - $tkPriv(pressY)}]]
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tkScrollToPos $w [expr {$tkPriv(initPos) + $delta}]
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}
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set tkPriv(initPos) ""
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}
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# tkScrollByUnits --
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# This procedure tells the scrollbar's associated widget to scroll up
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# or down by a given number of units. It notifies the associated widget
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| 297 |
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# in different ways for old and new command syntaxes.
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#
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# Arguments:
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# w - The scrollbar widget.
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# orient - Which kinds of scrollbars this applies to: "h" for
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# horizontal, "v" for vertical, "hv" for both.
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# amount - How many units to scroll: typically 1 or -1.
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proc tkScrollByUnits {w orient amount} {
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set cmd [$w cget -command]
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if {($cmd == "") || ([string first \
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[string index [$w cget -orient] 0] $orient] < 0)} {
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return
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| 310 |
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}
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| 311 |
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set info [$w get]
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if {[llength $info] == 2} {
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uplevel #0 $cmd scroll $amount units
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} else {
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| 315 |
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uplevel #0 $cmd [expr [lindex $info 2] + $amount]
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}
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}
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| 318 |
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| 319 |
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# tkScrollByPages --
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| 320 |
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# This procedure tells the scrollbar's associated widget to scroll up
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| 321 |
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# or down by a given number of screenfuls. It notifies the associated
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| 322 |
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# widget in different ways for old and new command syntaxes.
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| 323 |
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#
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| 324 |
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# Arguments:
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| 325 |
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# w - The scrollbar widget.
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| 326 |
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# orient - Which kinds of scrollbars this applies to: "h" for
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| 327 |
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# horizontal, "v" for vertical, "hv" for both.
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| 328 |
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# amount - How many screens to scroll: typically 1 or -1.
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| 329 |
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proc tkScrollByPages {w orient amount} {
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| 331 |
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set cmd [$w cget -command]
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| 332 |
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if {($cmd == "") || ([string first \
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| 333 |
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[string index [$w cget -orient] 0] $orient] < 0)} {
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| 334 |
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return
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| 335 |
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}
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| 336 |
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set info [$w get]
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| 337 |
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if {[llength $info] == 2} {
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| 338 |
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uplevel #0 $cmd scroll $amount pages
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| 339 |
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} else {
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| 340 |
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uplevel #0 $cmd [expr [lindex $info 2] + $amount*([lindex $info 1] - 1)]
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| 341 |
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}
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| 342 |
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}
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| 343 |
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| 344 |
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# tkScrollToPos --
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| 345 |
|
|
# This procedure tells the scrollbar's associated widget to scroll to
|
| 346 |
|
|
# a particular location, given by a fraction between 0 and 1. It notifies
|
| 347 |
|
|
# the associated widget in different ways for old and new command syntaxes.
|
| 348 |
|
|
#
|
| 349 |
|
|
# Arguments:
|
| 350 |
|
|
# w - The scrollbar widget.
|
| 351 |
|
|
# pos - A fraction between 0 and 1 indicating a desired position
|
| 352 |
|
|
# in the document.
|
| 353 |
|
|
|
| 354 |
|
|
proc tkScrollToPos {w pos} {
|
| 355 |
|
|
set cmd [$w cget -command]
|
| 356 |
|
|
if {($cmd == "")} {
|
| 357 |
|
|
return
|
| 358 |
|
|
}
|
| 359 |
|
|
set info [$w get]
|
| 360 |
|
|
if {[llength $info] == 2} {
|
| 361 |
|
|
uplevel #0 $cmd moveto $pos
|
| 362 |
|
|
} else {
|
| 363 |
|
|
uplevel #0 $cmd [expr round([lindex $info 0]*$pos)]
|
| 364 |
|
|
}
|
| 365 |
|
|
}
|
| 366 |
|
|
|
| 367 |
|
|
# tkScrollTopBottom
|
| 368 |
|
|
# Scroll to the top or bottom of the document, depending on the mouse
|
| 369 |
|
|
# position.
|
| 370 |
|
|
#
|
| 371 |
|
|
# Arguments:
|
| 372 |
|
|
# w - The scrollbar widget.
|
| 373 |
|
|
# x, y - Mouse coordinates within the widget.
|
| 374 |
|
|
|
| 375 |
|
|
proc tkScrollTopBottom {w x y} {
|
| 376 |
|
|
global tkPriv
|
| 377 |
|
|
set element [$w identify $x $y]
|
| 378 |
|
|
if {[string match *1 $element]} {
|
| 379 |
|
|
tkScrollToPos $w 0
|
| 380 |
|
|
} elseif {[string match *2 $element]} {
|
| 381 |
|
|
tkScrollToPos $w 1
|
| 382 |
|
|
}
|
| 383 |
|
|
|
| 384 |
|
|
# Set tkPriv(relief), since it's needed by tkScrollButtonUp.
|
| 385 |
|
|
|
| 386 |
|
|
set tkPriv(relief) [$w cget -activerelief]
|
| 387 |
|
|
}
|
| 388 |
|
|
|
| 389 |
|
|
# tkScrollButton2Down
|
| 390 |
|
|
# This procedure is invoked when button 2 is pressed over a scrollbar.
|
| 391 |
|
|
# If the button is over the trough or slider, it sets the scrollbar to
|
| 392 |
|
|
# the mouse position and starts a slider drag. Otherwise it just
|
| 393 |
|
|
# behaves the same as button 1.
|
| 394 |
|
|
#
|
| 395 |
|
|
# Arguments:
|
| 396 |
|
|
# w - The scrollbar widget.
|
| 397 |
|
|
# x, y - Mouse coordinates within the widget.
|
| 398 |
|
|
|
| 399 |
|
|
proc tkScrollButton2Down {w x y} {
|
| 400 |
|
|
global tkPriv
|
| 401 |
|
|
set element [$w identify $x $y]
|
| 402 |
|
|
if {($element == "arrow1") || ($element == "arrow2")} {
|
| 403 |
|
|
tkScrollButtonDown $w $x $y
|
| 404 |
|
|
return
|
| 405 |
|
|
}
|
| 406 |
|
|
tkScrollToPos $w [$w fraction $x $y]
|
| 407 |
|
|
set tkPriv(relief) [$w cget -activerelief]
|
| 408 |
|
|
|
| 409 |
|
|
# Need the "update idletasks" below so that the widget calls us
|
| 410 |
|
|
# back to reset the actual scrollbar position before we start the
|
| 411 |
|
|
# slider drag.
|
| 412 |
|
|
|
| 413 |
|
|
update idletasks
|
| 414 |
|
|
$w configure -activerelief sunken
|
| 415 |
|
|
$w activate slider
|
| 416 |
|
|
tkScrollStartDrag $w $x $y
|
| 417 |
|
|
}
|
