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