455 lines
12 KiB
Tcl
455 lines
12 KiB
Tcl
# 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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# 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 {[tk windowingsystem] eq "x11" || [tk windowingsystem] eq "aqua"} {
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bind Scrollbar <Enter> {
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if {$tk_strictMotif} {
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set tk::Priv(activeBg) [%W cget -activebackground]
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%W configure -activebackground [%W cget -background]
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}
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%W activate [%W identify %x %y]
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}
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bind Scrollbar <Motion> {
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%W activate [%W identify %x %y]
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}
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# The "info exists" command in the following binding handles the
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# situation where a Leave event occurs for a scrollbar without the Enter
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# event. This seems to happen on some systems (such as Solaris 2.4) for
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# unknown reasons.
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bind Scrollbar <Leave> {
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if {$tk_strictMotif && [info exists tk::Priv(activeBg)]} {
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%W configure -activebackground $tk::Priv(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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tk::ScrollButtonDown %W %x %y
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}
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bind Scrollbar <B1-Motion> {
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tk::ScrollDrag %W %x %y
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}
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bind Scrollbar <B1-B2-Motion> {
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tk::ScrollDrag %W %x %y
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}
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bind Scrollbar <ButtonRelease-1> {
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tk::ScrollButtonUp %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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tk::ScrollButton2Down %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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tk::ScrollDrag %W %x %y
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}
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bind Scrollbar <ButtonRelease-2> {
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tk::ScrollButtonUp %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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tk::ScrollTopBottom %W %x %y
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}
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bind Scrollbar <Control-2> {
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tk::ScrollTopBottom %W %x %y
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}
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bind Scrollbar <<PrevLine>> {
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tk::ScrollByUnits %W v -1
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}
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bind Scrollbar <<NextLine>> {
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tk::ScrollByUnits %W v 1
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}
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bind Scrollbar <<PrevPara>> {
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tk::ScrollByPages %W v -1
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}
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bind Scrollbar <<NextPara>> {
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tk::ScrollByPages %W v 1
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}
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bind Scrollbar <<PrevChar>> {
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tk::ScrollByUnits %W h -1
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}
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bind Scrollbar <<NextChar>> {
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tk::ScrollByUnits %W h 1
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}
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bind Scrollbar <<PrevWord>> {
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tk::ScrollByPages %W h -1
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}
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bind Scrollbar <<NextWord>> {
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tk::ScrollByPages %W h 1
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}
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bind Scrollbar <Prior> {
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tk::ScrollByPages %W hv -1
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}
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bind Scrollbar <Next> {
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tk::ScrollByPages %W hv 1
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}
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bind Scrollbar <<LineStart>> {
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tk::ScrollToPos %W 0
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}
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bind Scrollbar <<LineEnd>> {
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tk::ScrollToPos %W 1
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}
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}
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switch [tk windowingsystem] {
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"aqua" {
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bind Scrollbar <MouseWheel> {
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tk::ScrollByUnits %W v [expr {- (%D)}]
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}
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bind Scrollbar <Option-MouseWheel> {
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tk::ScrollByUnits %W v [expr {-10 * (%D)}]
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}
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bind Scrollbar <Shift-MouseWheel> {
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tk::ScrollByUnits %W h [expr {- (%D)}]
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}
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bind Scrollbar <Shift-Option-MouseWheel> {
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tk::ScrollByUnits %W h [expr {-10 * (%D)}]
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}
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}
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"win32" {
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bind Scrollbar <MouseWheel> {
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tk::ScrollByUnits %W v [expr {- (%D / 120) * 4}]
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}
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bind Scrollbar <Shift-MouseWheel> {
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tk::ScrollByUnits %W h [expr {- (%D / 120) * 4}]
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}
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}
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"x11" {
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bind Scrollbar <MouseWheel> {
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tk::ScrollByUnits %W v [expr {- (%D /120 ) * 4}]
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}
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bind Scrollbar <Shift-MouseWheel> {
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tk::ScrollByUnits %W h [expr {- (%D /120 ) * 4}]
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}
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bind Scrollbar <4> {tk::ScrollByUnits %W v -5}
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bind Scrollbar <5> {tk::ScrollByUnits %W v 5}
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bind Scrollbar <Shift-4> {tk::ScrollByUnits %W h -5}
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bind Scrollbar <Shift-5> {tk::ScrollByUnits %W h 5}
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}
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}
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# tk::ScrollButtonDown --
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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 tk::ScrollButtonDown {w x y} {
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variable ::tk::Priv
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set Priv(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 eq "slider"} {
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ScrollStartDrag $w $x $y
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} else {
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ScrollSelect $w $element initial
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}
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}
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# ::tk::ScrollButtonUp --
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# This procedure is invoked when a button is released in a scrollbar.
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# It cancels scans and auto-repeats that were in progress, and restores
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# the way the active element is displayed.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - Mouse coordinates.
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proc ::tk::ScrollButtonUp {w x y} {
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variable ::tk::Priv
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tk::CancelRepeat
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if {[info exists Priv(relief)]} {
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# Avoid error due to spurious release events
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$w configure -activerelief $Priv(relief)
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ScrollEndDrag $w $x $y
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$w activate [$w identify $x $y]
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}
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}
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# ::tk::ScrollSelect --
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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 ::tk::ScrollSelect {w element repeat} {
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variable ::tk::Priv
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if {![winfo exists $w]} return
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switch -- $element {
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"arrow1" {ScrollByUnits $w hv -1}
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"trough1" {ScrollByPages $w hv -1}
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"trough2" {ScrollByPages $w hv 1}
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"arrow2" {ScrollByUnits $w hv 1}
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default {return}
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}
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if {$repeat eq "again"} {
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set Priv(afterId) [after [$w cget -repeatinterval] \
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[list tk::ScrollSelect $w $element again]]
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} elseif {$repeat eq "initial"} {
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set delay [$w cget -repeatdelay]
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if {$delay > 0} {
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set Priv(afterId) [after $delay \
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[list tk::ScrollSelect $w $element again]]
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}
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}
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}
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# ::tk::ScrollStartDrag --
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# This procedure is called to initiate a drag of the slider. It just
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# remembers the starting position of the mouse and slider.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - The mouse position at the start of the drag operation.
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proc ::tk::ScrollStartDrag {w x y} {
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variable ::tk::Priv
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if {[$w cget -command] eq ""} {
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return
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}
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set Priv(pressX) $x
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set Priv(pressY) $y
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set Priv(initValues) [$w get]
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set iv0 [lindex $Priv(initValues) 0]
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if {[llength $Priv(initValues)] == 2} {
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set Priv(initPos) $iv0
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} elseif {$iv0 == 0} {
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set Priv(initPos) 0.0
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} else {
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set Priv(initPos) [expr {(double([lindex $Priv(initValues) 2])) \
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/ [lindex $Priv(initValues) 0]}]
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}
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}
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# ::tk::ScrollDrag --
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# This procedure is called for each mouse motion even when the slider
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# is being dragged. It notifies the associated widget if we're not
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# jump scrolling, and it just updates the scrollbar if we are jump
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# scrolling.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - The current mouse position.
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proc ::tk::ScrollDrag {w x y} {
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variable ::tk::Priv
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if {$Priv(initPos) eq ""} {
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return
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}
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set delta [$w delta [expr {$x - $Priv(pressX)}] [expr {$y - $Priv(pressY)}]]
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if {[$w cget -jump]} {
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if {[llength $Priv(initValues)] == 2} {
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$w set [expr {[lindex $Priv(initValues) 0] + $delta}] \
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[expr {[lindex $Priv(initValues) 1] + $delta}]
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} else {
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set delta [expr {round($delta * [lindex $Priv(initValues) 0])}]
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eval [list $w] set [lreplace $Priv(initValues) 2 3 \
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[expr {[lindex $Priv(initValues) 2] + $delta}] \
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[expr {[lindex $Priv(initValues) 3] + $delta}]]
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}
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} else {
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ScrollToPos $w [expr {$Priv(initPos) + $delta}]
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}
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}
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# ::tk::ScrollEndDrag --
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# This procedure is called to end an interactive drag of the slider.
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# It scrolls the window if we're in jump mode, otherwise it does nothing.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - The mouse position at the end of the drag operation.
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proc ::tk::ScrollEndDrag {w x y} {
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variable ::tk::Priv
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if {$Priv(initPos) eq ""} {
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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 - $Priv(pressX)}] \
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[expr {$y - $Priv(pressY)}]]
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ScrollToPos $w [expr {$Priv(initPos) + $delta}]
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}
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set Priv(initPos) ""
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}
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# ::tk::ScrollByUnits --
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# This procedure tells the scrollbar's associated widget to scroll up
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# or down by a given number of units. It notifies the associated widget
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# in different ways for old and new command syntaxes.
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#
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# Arguments:
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# w - The scrollbar widget.
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# orient - Which kinds of scrollbars this applies to: "h" for
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# horizontal, "v" for vertical, "hv" for both.
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# amount - How many units to scroll: typically 1 or -1.
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proc ::tk::ScrollByUnits {w orient amount} {
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set cmd [$w cget -command]
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if {$cmd eq "" || ([string first \
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[string index [$w cget -orient] 0] $orient] < 0)} {
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return
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}
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set info [$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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uplevel #0 $cmd [expr {[lindex $info 2] + $amount}]
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}
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}
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# ::tk::ScrollByPages --
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# This procedure tells the scrollbar's associated widget to scroll up
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# or down by a given number of screenfuls. It notifies the associated
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# widget in different ways for old and new command syntaxes.
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#
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# Arguments:
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# w - The scrollbar widget.
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# orient - Which kinds of scrollbars this applies to: "h" for
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# horizontal, "v" for vertical, "hv" for both.
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# amount - How many screens to scroll: typically 1 or -1.
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proc ::tk::ScrollByPages {w orient amount} {
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set cmd [$w cget -command]
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if {$cmd eq "" || ([string first \
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[string index [$w cget -orient] 0] $orient] < 0)} {
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return
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}
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set info [$w get]
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if {[llength $info] == 2} {
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uplevel #0 $cmd scroll $amount pages
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} else {
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uplevel #0 $cmd [expr {[lindex $info 2] + $amount*([lindex $info 1] - 1)}]
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}
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}
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# ::tk::ScrollToPos --
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# This procedure tells the scrollbar's associated widget to scroll to
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# a particular location, given by a fraction between 0 and 1. It notifies
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# the associated widget in different ways for old and new command syntaxes.
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#
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# Arguments:
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# w - The scrollbar widget.
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# pos - A fraction between 0 and 1 indicating a desired position
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# in the document.
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proc ::tk::ScrollToPos {w pos} {
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set cmd [$w cget -command]
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if {$cmd eq ""} {
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return
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}
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set info [$w get]
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if {[llength $info] == 2} {
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uplevel #0 $cmd moveto $pos
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} else {
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uplevel #0 $cmd [expr {round([lindex $info 0]*$pos)}]
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}
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}
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# ::tk::ScrollTopBottom
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# Scroll to the top or bottom of the document, depending on the mouse
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# position.
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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 within the widget.
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proc ::tk::ScrollTopBottom {w x y} {
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variable ::tk::Priv
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set element [$w identify $x $y]
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if {[string match *1 $element]} {
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ScrollToPos $w 0
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} elseif {[string match *2 $element]} {
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ScrollToPos $w 1
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}
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# Set Priv(relief), since it's needed by tk::ScrollButtonUp.
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set Priv(relief) [$w cget -activerelief]
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}
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# ::tk::ScrollButton2Down
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# This procedure is invoked when button 2 is pressed over a scrollbar.
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# If the button is over the trough or slider, it sets the scrollbar to
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# the mouse position and starts a slider drag. Otherwise it just
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# behaves the same as button 1.
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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 within the widget.
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proc ::tk::ScrollButton2Down {w x y} {
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variable ::tk::Priv
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if {![winfo exists $w]} {
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return
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}
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set element [$w identify $x $y]
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if {[string match {arrow[12]} $element]} {
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ScrollButtonDown $w $x $y
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return
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}
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ScrollToPos $w [$w fraction $x $y]
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set Priv(relief) [$w cget -activerelief]
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# Need the "update idletasks" below so that the widget calls us
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# back to reset the actual scrollbar position before we start the
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# slider drag.
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update idletasks
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if {[winfo exists $w]} {
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$w configure -activerelief sunken
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$w activate slider
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ScrollStartDrag $w $x $y
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}
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}
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