scale.tcl
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- # scale.tcl --
- #
- # This file defines the default bindings for Tk scale widgets and provides
- # procedures that help in implementing the bindings.
- #
- # RCS: @(#) $Id: scale.tcl,v 1.9.2.5 2006/03/17 10:50:11 patthoyts Exp $
- #
- # Copyright (c) 1994 The Regents of the University of California.
- # Copyright (c) 1994-1995 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 entries.
- #-------------------------------------------------------------------------
- # Standard Motif bindings:
- bind Scale <Enter> {
- if {$tk_strictMotif} {
- set tk::Priv(activeBg) [%W cget -activebackground]
- %W configure -activebackground [%W cget -background]
- }
- tk::ScaleActivate %W %x %y
- }
- bind Scale <Motion> {
- tk::ScaleActivate %W %x %y
- }
- bind Scale <Leave> {
- if {$tk_strictMotif} {
- %W configure -activebackground $tk::Priv(activeBg)
- }
- if {[%W cget -state] eq "active"} {
- %W configure -state normal
- }
- }
- bind Scale <1> {
- tk::ScaleButtonDown %W %x %y
- }
- bind Scale <B1-Motion> {
- tk::ScaleDrag %W %x %y
- }
- bind Scale <B1-Leave> { }
- bind Scale <B1-Enter> { }
- bind Scale <ButtonRelease-1> {
- tk::CancelRepeat
- tk::ScaleEndDrag %W
- tk::ScaleActivate %W %x %y
- }
- bind Scale <2> {
- tk::ScaleButton2Down %W %x %y
- }
- bind Scale <B2-Motion> {
- tk::ScaleDrag %W %x %y
- }
- bind Scale <B2-Leave> { }
- bind Scale <B2-Enter> { }
- bind Scale <ButtonRelease-2> {
- tk::CancelRepeat
- tk::ScaleEndDrag %W
- tk::ScaleActivate %W %x %y
- }
- if {$tcl_platform(platform) eq "windows"} {
- # On Windows do the same with button 3, as that is the right mouse button
- bind Scale <3> [bind Scale <2>]
- bind Scale <B3-Motion> [bind Scale <B2-Motion>]
- bind Scale <B3-Leave> [bind Scale <B2-Leave>]
- bind Scale <B3-Enter> [bind Scale <B2-Enter>]
- bind Scale <ButtonRelease-3> [bind Scale <ButtonRelease-2>]
- }
- bind Scale <Control-1> {
- tk::ScaleControlPress %W %x %y
- }
- bind Scale <Up> {
- tk::ScaleIncrement %W up little noRepeat
- }
- bind Scale <Down> {
- tk::ScaleIncrement %W down little noRepeat
- }
- bind Scale <Left> {
- tk::ScaleIncrement %W up little noRepeat
- }
- bind Scale <Right> {
- tk::ScaleIncrement %W down little noRepeat
- }
- bind Scale <Control-Up> {
- tk::ScaleIncrement %W up big noRepeat
- }
- bind Scale <Control-Down> {
- tk::ScaleIncrement %W down big noRepeat
- }
- bind Scale <Control-Left> {
- tk::ScaleIncrement %W up big noRepeat
- }
- bind Scale <Control-Right> {
- tk::ScaleIncrement %W down big noRepeat
- }
- bind Scale <Home> {
- %W set [%W cget -from]
- }
- bind Scale <End> {
- %W set [%W cget -to]
- }
- # ::tk::ScaleActivate --
- # This procedure is invoked to check a given x-y position in the
- # scale and activate the slider if the x-y position falls within
- # the slider.
- #
- # Arguments:
- # w - The scale widget.
- # x, y - Mouse coordinates.
- proc ::tk::ScaleActivate {w x y} {
- if {[$w cget -state] eq "disabled"} {
- return
- }
- if {[$w identify $x $y] eq "slider"} {
- set state active
- } else {
- set state normal
- }
- if {[$w cget -state] ne $state} {
- $w configure -state $state
- }
- }
- # ::tk::ScaleButtonDown --
- # This procedure is invoked when a button is pressed in a scale. It
- # takes different actions depending on where the button was pressed.
- #
- # Arguments:
- # w - The scale widget.
- # x, y - Mouse coordinates of button press.
- proc ::tk::ScaleButtonDown {w x y} {
- variable ::tk::Priv
- set Priv(dragging) 0
- set el [$w identify $x $y]
- # save the relief
- set Priv($w,relief) [$w cget -sliderrelief]
- if {$el eq "trough1"} {
- ScaleIncrement $w up little initial
- } elseif {$el eq "trough2"} {
- ScaleIncrement $w down little initial
- } elseif {$el eq "slider"} {
- set Priv(dragging) 1
- set Priv(initValue) [$w get]
- set coords [$w coords]
- set Priv(deltaX) [expr {$x - [lindex $coords 0]}]
- set Priv(deltaY) [expr {$y - [lindex $coords 1]}]
- switch -exact -- $Priv($w,relief) {
- "raised" { $w configure -sliderrelief sunken }
- "ridge" { $w configure -sliderrelief groove }
- }
- }
- }
- # ::tk::ScaleDrag --
- # This procedure is called when the mouse is dragged with
- # mouse button 1 down. If the drag started inside the slider
- # (i.e. the scale is active) then the scale's value is adjusted
- # to reflect the mouse's position.
- #
- # Arguments:
- # w - The scale widget.
- # x, y - Mouse coordinates.
- proc ::tk::ScaleDrag {w x y} {
- variable ::tk::Priv
- if {!$Priv(dragging)} {
- return
- }
- $w set [$w get [expr {$x-$Priv(deltaX)}] [expr {$y-$Priv(deltaY)}]]
- }
- # ::tk::ScaleEndDrag --
- # This procedure is called to end an interactive drag of the
- # slider. It just marks the drag as over.
- #
- # Arguments:
- # w - The scale widget.
- proc ::tk::ScaleEndDrag {w} {
- variable ::tk::Priv
- set Priv(dragging) 0
- if {[info exists Priv($w,relief)]} {
- $w configure -sliderrelief $Priv($w,relief)
- unset Priv($w,relief)
- }
- }
- # ::tk::ScaleIncrement --
- # This procedure is invoked to increment the value of a scale and
- # to set up auto-repeating of the action if that is desired. The
- # way the value is incremented depends on the "dir" and "big"
- # arguments.
- #
- # Arguments:
- # w - The scale widget.
- # dir - "up" means move value towards -from, "down" means
- # move towards -to.
- # big - Size of increments: "big" or "little".
- # 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::ScaleIncrement {w dir big repeat} {
- variable ::tk::Priv
- if {![winfo exists $w]} return
- if {$big eq "big"} {
- set inc [$w cget -bigincrement]
- if {$inc == 0} {
- set inc [expr {abs([$w cget -to] - [$w cget -from])/10.0}]
- }
- if {$inc < [$w cget -resolution]} {
- set inc [$w cget -resolution]
- }
- } else {
- set inc [$w cget -resolution]
- }
- if {([$w cget -from] > [$w cget -to]) ^ ($dir eq "up")} {
- set inc [expr {-$inc}]
- }
- $w set [expr {[$w get] + $inc}]
- if {$repeat eq "again"} {
- set Priv(afterId) [after [$w cget -repeatinterval]
- [list tk::ScaleIncrement $w $dir $big again]]
- } elseif {$repeat eq "initial"} {
- set delay [$w cget -repeatdelay]
- if {$delay > 0} {
- set Priv(afterId) [after $delay
- [list tk::ScaleIncrement $w $dir $big again]]
- }
- }
- }
- # ::tk::ScaleControlPress --
- # This procedure handles button presses that are made with the Control
- # key down. Depending on the mouse position, it adjusts the scale
- # value to one end of the range or the other.
- #
- # Arguments:
- # w - The scale widget.
- # x, y - Mouse coordinates where the button was pressed.
- proc ::tk::ScaleControlPress {w x y} {
- set el [$w identify $x $y]
- if {$el eq "trough1"} {
- $w set [$w cget -from]
- } elseif {$el eq "trough2"} {
- $w set [$w cget -to]
- }
- }
- # ::tk::ScaleButton2Down
- # This procedure is invoked when button 2 is pressed over a scale.
- # It sets the value to correspond to the mouse position and starts
- # a slider drag.
- #
- # Arguments:
- # w - The scrollbar widget.
- # x, y - Mouse coordinates within the widget.
- proc ::tk::ScaleButton2Down {w x y} {
- variable ::tk::Priv
- if {[$w cget -state] eq "disabled"} {
- return
- }
- $w configure -state active
- $w set [$w get $x $y]
- set Priv(dragging) 1
- set Priv(initValue) [$w get]
- set Priv($w,relief) [$w cget -sliderrelief]
- set coords "$x $y"
- set Priv(deltaX) 0
- set Priv(deltaY) 0
- }