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authorrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
committerrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
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+# scrlbar.tcl --
+#
+# This file defines the default bindings for Tk scrollbar widgets.
+# It also provides procedures that help in implementing the bindings.
+#
+# SCCS: @(#) scrlbar.tcl 1.26 96/11/30 17:19:16
+#
+# Copyright (c) 1994 The Regents of the University of California.
+# Copyright (c) 1994-1996 Sun Microsystems, Inc.
+#
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+#
+
+#-------------------------------------------------------------------------
+# The code below creates the default class bindings for scrollbars.
+#-------------------------------------------------------------------------
+
+# Standard Motif bindings:
+if {($tcl_platform(platform) != "windows") &&
+ ($tcl_platform(platform) != "macintosh")} {
+bind Scrollbar <Enter> {
+ if $tk_strictMotif {
+ set tkPriv(activeBg) [%W cget -activebackground]
+ %W config -activebackground [%W cget -background]
+ }
+ %W activate [%W identify %x %y]
+}
+bind Scrollbar <Motion> {
+ %W activate [%W identify %x %y]
+}
+
+# The "info exists" command in the following binding handles the
+# situation where a Leave event occurs for a scrollbar without the Enter
+# event. This seems to happen on some systems (such as Solaris 2.4) for
+# unknown reasons.
+
+bind Scrollbar <Leave> {
+ if {$tk_strictMotif && [info exists tkPriv(activeBg)]} {
+ %W config -activebackground $tkPriv(activeBg)
+ }
+ %W activate {}
+}
+bind Scrollbar <1> {
+ tkScrollButtonDown %W %x %y
+}
+bind Scrollbar <B1-Motion> {
+ tkScrollDrag %W %x %y
+}
+bind Scrollbar <B1-B2-Motion> {
+ tkScrollDrag %W %x %y
+}
+bind Scrollbar <ButtonRelease-1> {
+ tkScrollButtonUp %W %x %y
+}
+bind Scrollbar <B1-Leave> {
+ # Prevents <Leave> binding from being invoked.
+}
+bind Scrollbar <B1-Enter> {
+ # Prevents <Enter> binding from being invoked.
+}
+bind Scrollbar <2> {
+ tkScrollButton2Down %W %x %y
+}
+bind Scrollbar <B1-2> {
+ # Do nothing, since button 1 is already down.
+}
+bind Scrollbar <B2-1> {
+ # Do nothing, since button 2 is already down.
+}
+bind Scrollbar <B2-Motion> {
+ tkScrollDrag %W %x %y
+}
+bind Scrollbar <ButtonRelease-2> {
+ tkScrollButtonUp %W %x %y
+}
+bind Scrollbar <B1-ButtonRelease-2> {
+ # Do nothing: B1 release will handle it.
+}
+bind Scrollbar <B2-ButtonRelease-1> {
+ # Do nothing: B2 release will handle it.
+}
+bind Scrollbar <B2-Leave> {
+ # Prevents <Leave> binding from being invoked.
+}
+bind Scrollbar <B2-Enter> {
+ # Prevents <Enter> binding from being invoked.
+}
+bind Scrollbar <Control-1> {
+ tkScrollTopBottom %W %x %y
+}
+bind Scrollbar <Control-2> {
+ tkScrollTopBottom %W %x %y
+}
+
+bind Scrollbar <Up> {
+ tkScrollByUnits %W v -1
+}
+bind Scrollbar <Down> {
+ tkScrollByUnits %W v 1
+}
+bind Scrollbar <Control-Up> {
+ tkScrollByPages %W v -1
+}
+bind Scrollbar <Control-Down> {
+ tkScrollByPages %W v 1
+}
+bind Scrollbar <Left> {
+ tkScrollByUnits %W h -1
+}
+bind Scrollbar <Right> {
+ tkScrollByUnits %W h 1
+}
+bind Scrollbar <Control-Left> {
+ tkScrollByPages %W h -1
+}
+bind Scrollbar <Control-Right> {
+ tkScrollByPages %W h 1
+}
+bind Scrollbar <Prior> {
+ tkScrollByPages %W hv -1
+}
+bind Scrollbar <Next> {
+ tkScrollByPages %W hv 1
+}
+bind Scrollbar <Home> {
+ tkScrollToPos %W 0
+}
+bind Scrollbar <End> {
+ tkScrollToPos %W 1
+}
+}
+# tkScrollButtonDown --
+# This procedure is invoked when a button is pressed in a scrollbar.
+# It changes the way the scrollbar is displayed and takes actions
+# depending on where the mouse is.
+#
+# Arguments:
+# w - The scrollbar widget.
+# x, y - Mouse coordinates.
+
+proc tkScrollButtonDown {w x y} {
+ global tkPriv
+ set tkPriv(relief) [$w cget -activerelief]
+ $w configure -activerelief sunken
+ set element [$w identify $x $y]
+ if {$element == "slider"} {
+ tkScrollStartDrag $w $x $y
+ } else {
+ tkScrollSelect $w $element initial
+ }
+}
+
+# tkScrollButtonUp --
+# This procedure is invoked when a button is released in a scrollbar.
+# It cancels scans and auto-repeats that were in progress, and restores
+# the way the active element is displayed.
+#
+# Arguments:
+# w - The scrollbar widget.
+# x, y - Mouse coordinates.
+
+proc tkScrollButtonUp {w x y} {
+ global tkPriv
+ tkCancelRepeat
+ $w configure -activerelief $tkPriv(relief)
+ tkScrollEndDrag $w $x $y
+ $w activate [$w identify $x $y]
+}
+
+# tkScrollSelect --
+# This procedure is invoked when a button is pressed over the scrollbar.
+# It invokes one of several scrolling actions depending on where in
+# the scrollbar the button was pressed.
+#
+# Arguments:
+# w - The scrollbar widget.
+# element - The element of the scrollbar that was selected, such
+# as "arrow1" or "trough2". Shouldn't be "slider".
+# repeat - Whether and how to auto-repeat the action: "noRepeat"
+# means don't auto-repeat, "initial" means this is the
+# first action in an auto-repeat sequence, and "again"
+# means this is the second repetition or later.
+
+proc tkScrollSelect {w element repeat} {
+ global tkPriv
+ if {![winfo exists $w]} return
+ if {$element == "arrow1"} {
+ tkScrollByUnits $w hv -1
+ } elseif {$element == "trough1"} {
+ tkScrollByPages $w hv -1
+ } elseif {$element == "trough2"} {
+ tkScrollByPages $w hv 1
+ } elseif {$element == "arrow2"} {
+ tkScrollByUnits $w hv 1
+ } else {
+ return
+ }
+ if {$repeat == "again"} {
+ set tkPriv(afterId) [after [$w cget -repeatinterval] \
+ tkScrollSelect $w $element again]
+ } elseif {$repeat == "initial"} {
+ set delay [$w cget -repeatdelay]
+ if {$delay > 0} {
+ set tkPriv(afterId) [after $delay tkScrollSelect $w $element again]
+ }
+ }
+}
+
+# tkScrollStartDrag --
+# This procedure is called to initiate a drag of the slider. It just
+# remembers the starting position of the mouse and slider.
+#
+# Arguments:
+# w - The scrollbar widget.
+# x, y - The mouse position at the start of the drag operation.
+
+proc tkScrollStartDrag {w x y} {
+ global tkPriv
+
+ if {[$w cget -command] == ""} {
+ return
+ }
+ set tkPriv(pressX) $x
+ set tkPriv(pressY) $y
+ set tkPriv(initValues) [$w get]
+ set iv0 [lindex $tkPriv(initValues) 0]
+ if {[llength $tkPriv(initValues)] == 2} {
+ set tkPriv(initPos) $iv0
+ } else {
+ if {$iv0 == 0} {
+ set tkPriv(initPos) 0.0
+ } else {
+ set tkPriv(initPos) [expr (double([lindex $tkPriv(initValues) 2])) \
+ / [lindex $tkPriv(initValues) 0]]
+ }
+ }
+}
+
+# tkScrollDrag --
+# This procedure is called for each mouse motion even when the slider
+# is being dragged. It notifies the associated widget if we're not
+# jump scrolling, and it just updates the scrollbar if we are jump
+# scrolling.
+#
+# Arguments:
+# w - The scrollbar widget.
+# x, y - The current mouse position.
+
+proc tkScrollDrag {w x y} {
+ global tkPriv
+
+ if {$tkPriv(initPos) == ""} {
+ return
+ }
+ set delta [$w delta [expr $x - $tkPriv(pressX)] [expr $y - $tkPriv(pressY)]]
+ if [$w cget -jump] {
+ if {[llength $tkPriv(initValues)] == 2} {
+ $w set [expr [lindex $tkPriv(initValues) 0] + $delta] \
+ [expr [lindex $tkPriv(initValues) 1] + $delta]
+ } else {
+ set delta [expr round($delta * [lindex $tkPriv(initValues) 0])]
+ eval $w set [lreplace $tkPriv(initValues) 2 3 \
+ [expr [lindex $tkPriv(initValues) 2] + $delta] \
+ [expr [lindex $tkPriv(initValues) 3] + $delta]]
+ }
+ } else {
+ tkScrollToPos $w [expr $tkPriv(initPos) + $delta]
+ }
+}
+
+# tkScrollEndDrag --
+# This procedure is called to end an interactive drag of the slider.
+# It scrolls the window if we're in jump mode, otherwise it does nothing.
+#
+# Arguments:
+# w - The scrollbar widget.
+# x, y - The mouse position at the end of the drag operation.
+
+proc tkScrollEndDrag {w x y} {
+ global tkPriv
+
+ if {$tkPriv(initPos) == ""} {
+ return
+ }
+ if [$w cget -jump] {
+ set delta [$w delta [expr $x - $tkPriv(pressX)] \
+ [expr $y - $tkPriv(pressY)]]
+ tkScrollToPos $w [expr $tkPriv(initPos) + $delta]
+ }
+ set tkPriv(initPos) ""
+}
+
+# tkScrollByUnits --
+# This procedure tells the scrollbar's associated widget to scroll up
+# or down by a given number of units. It notifies the associated widget
+# in different ways for old and new command syntaxes.
+#
+# Arguments:
+# w - The scrollbar widget.
+# orient - Which kinds of scrollbars this applies to: "h" for
+# horizontal, "v" for vertical, "hv" for both.
+# amount - How many units to scroll: typically 1 or -1.
+
+proc tkScrollByUnits {w orient amount} {
+ set cmd [$w cget -command]
+ if {($cmd == "") || ([string first \
+ [string index [$w cget -orient] 0] $orient] < 0)} {
+ return
+ }
+ set info [$w get]
+ if {[llength $info] == 2} {
+ uplevel #0 $cmd scroll $amount units
+ } else {
+ uplevel #0 $cmd [expr [lindex $info 2] + $amount]
+ }
+}
+
+# tkScrollByPages --
+# This procedure tells the scrollbar's associated widget to scroll up
+# or down by a given number of screenfuls. It notifies the associated
+# widget in different ways for old and new command syntaxes.
+#
+# Arguments:
+# w - The scrollbar widget.
+# orient - Which kinds of scrollbars this applies to: "h" for
+# horizontal, "v" for vertical, "hv" for both.
+# amount - How many screens to scroll: typically 1 or -1.
+
+proc tkScrollByPages {w orient amount} {
+ set cmd [$w cget -command]
+ if {($cmd == "") || ([string first \
+ [string index [$w cget -orient] 0] $orient] < 0)} {
+ return
+ }
+ set info [$w get]
+ if {[llength $info] == 2} {
+ uplevel #0 $cmd scroll $amount pages
+ } else {
+ uplevel #0 $cmd [expr [lindex $info 2] + $amount*([lindex $info 1] - 1)]
+ }
+}
+
+# tkScrollToPos --
+# This procedure tells the scrollbar's associated widget to scroll to
+# a particular location, given by a fraction between 0 and 1. It notifies
+# the associated widget in different ways for old and new command syntaxes.
+#
+# Arguments:
+# w - The scrollbar widget.
+# pos - A fraction between 0 and 1 indicating a desired position
+# in the document.
+
+proc tkScrollToPos {w pos} {
+ set cmd [$w cget -command]
+ if {($cmd == "")} {
+ return
+ }
+ set info [$w get]
+ if {[llength $info] == 2} {
+ uplevel #0 $cmd moveto $pos
+ } else {
+ uplevel #0 $cmd [expr round([lindex $info 0]*$pos)]
+ }
+}
+
+# tkScrollTopBottom
+# Scroll to the top or bottom of the document, depending on the mouse
+# position.
+#
+# Arguments:
+# w - The scrollbar widget.
+# x, y - Mouse coordinates within the widget.
+
+proc tkScrollTopBottom {w x y} {
+ global tkPriv
+ set element [$w identify $x $y]
+ if [string match *1 $element] {
+ tkScrollToPos $w 0
+ } elseif [string match *2 $element] {
+ tkScrollToPos $w 1
+ }
+
+ # Set tkPriv(relief), since it's needed by tkScrollButtonUp.
+
+ set tkPriv(relief) [$w cget -activerelief]
+}
+
+# tkScrollButton2Down
+# This procedure is invoked when button 2 is pressed over a scrollbar.
+# If the button is over the trough or slider, it sets the scrollbar to
+# the mouse position and starts a slider drag. Otherwise it just
+# behaves the same as button 1.
+#
+# Arguments:
+# w - The scrollbar widget.
+# x, y - Mouse coordinates within the widget.
+
+proc tkScrollButton2Down {w x y} {
+ global tkPriv
+ set element [$w identify $x $y]
+ if {($element == "arrow1") || ($element == "arrow2")} {
+ tkScrollButtonDown $w $x $y
+ return
+ }
+ tkScrollToPos $w [$w fraction $x $y]
+ set tkPriv(relief) [$w cget -activerelief]
+
+ # Need the "update idletasks" below so that the widget calls us
+ # back to reset the actual scrollbar position before we start the
+ # slider drag.
+
+ update idletasks
+ $w configure -activerelief sunken
+ $w activate slider
+ tkScrollStartDrag $w $x $y
+}