285 lines
7.4 KiB
Tcl
285 lines
7.4 KiB
Tcl
# scale.tcl --
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#
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# This file defines the default bindings for Tk scale widgets and provides
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# 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) 1994-1995 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 entries.
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#-------------------------------------------------------------------------
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# Standard Motif bindings:
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bind Scale <Enter> {
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if {$tk_strictMotif} {
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set tk::Priv(activeBg) [%W cget -activebackground]
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%W configure -activebackground [%W cget -background]
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}
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tk::ScaleActivate %W %x %y
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}
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bind Scale <Motion> {
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tk::ScaleActivate %W %x %y
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}
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bind Scale <Leave> {
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if {$tk_strictMotif} {
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%W configure -activebackground $tk::Priv(activeBg)
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}
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if {[%W cget -state] eq "active"} {
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%W configure -state normal
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}
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}
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bind Scale <1> {
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tk::ScaleButtonDown %W %x %y
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}
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bind Scale <B1-Motion> {
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tk::ScaleDrag %W %x %y
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}
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bind Scale <B1-Leave> { }
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bind Scale <B1-Enter> { }
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bind Scale <ButtonRelease-1> {
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tk::CancelRepeat
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tk::ScaleEndDrag %W
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tk::ScaleActivate %W %x %y
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}
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bind Scale <2> {
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tk::ScaleButton2Down %W %x %y
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}
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bind Scale <B2-Motion> {
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tk::ScaleDrag %W %x %y
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}
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bind Scale <B2-Leave> { }
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bind Scale <B2-Enter> { }
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bind Scale <ButtonRelease-2> {
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tk::CancelRepeat
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tk::ScaleEndDrag %W
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tk::ScaleActivate %W %x %y
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}
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if {[tk windowingsystem] eq "win32"} {
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# On Windows do the same with button 3, as that is the right mouse button
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bind Scale <3> [bind Scale <2>]
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bind Scale <B3-Motion> [bind Scale <B2-Motion>]
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bind Scale <B3-Leave> [bind Scale <B2-Leave>]
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bind Scale <B3-Enter> [bind Scale <B2-Enter>]
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bind Scale <ButtonRelease-3> [bind Scale <ButtonRelease-2>]
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}
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bind Scale <Control-1> {
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tk::ScaleControlPress %W %x %y
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}
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bind Scale <Up> {
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tk::ScaleIncrement %W up little noRepeat
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}
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bind Scale <Down> {
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tk::ScaleIncrement %W down little noRepeat
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}
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bind Scale <Left> {
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tk::ScaleIncrement %W up little noRepeat
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}
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bind Scale <Right> {
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tk::ScaleIncrement %W down little noRepeat
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}
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bind Scale <Control-Up> {
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tk::ScaleIncrement %W up big noRepeat
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}
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bind Scale <Control-Down> {
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tk::ScaleIncrement %W down big noRepeat
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}
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bind Scale <Control-Left> {
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tk::ScaleIncrement %W up big noRepeat
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}
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bind Scale <Control-Right> {
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tk::ScaleIncrement %W down big noRepeat
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}
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bind Scale <Home> {
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%W set [%W cget -from]
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}
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bind Scale <End> {
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%W set [%W cget -to]
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}
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# ::tk::ScaleActivate --
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# This procedure is invoked to check a given x-y position in the
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# scale and activate the slider if the x-y position falls within
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# the slider.
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#
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# Arguments:
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# w - The scale widget.
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# x, y - Mouse coordinates.
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proc ::tk::ScaleActivate {w x y} {
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if {[$w cget -state] eq "disabled"} {
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return
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}
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if {[$w identify $x $y] eq "slider"} {
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set state active
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} else {
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set state normal
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}
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if {[$w cget -state] ne $state} {
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$w configure -state $state
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}
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}
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# ::tk::ScaleButtonDown --
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# This procedure is invoked when a button is pressed in a scale. It
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# takes different actions depending on where the button was pressed.
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#
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# Arguments:
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# w - The scale widget.
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# x, y - Mouse coordinates of button press.
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proc ::tk::ScaleButtonDown {w x y} {
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variable ::tk::Priv
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set Priv(dragging) 0
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set el [$w identify $x $y]
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# save the relief
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set Priv($w,relief) [$w cget -sliderrelief]
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if {$el eq "trough1"} {
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ScaleIncrement $w up little initial
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} elseif {$el eq "trough2"} {
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ScaleIncrement $w down little initial
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} elseif {$el eq "slider"} {
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set Priv(dragging) 1
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set Priv(initValue) [$w get]
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set coords [$w coords]
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set Priv(deltaX) [expr {$x - [lindex $coords 0]}]
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set Priv(deltaY) [expr {$y - [lindex $coords 1]}]
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switch -exact -- $Priv($w,relief) {
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"raised" { $w configure -sliderrelief sunken }
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"ridge" { $w configure -sliderrelief groove }
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}
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}
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}
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# ::tk::ScaleDrag --
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# This procedure is called when the mouse is dragged with
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# mouse button 1 down. If the drag started inside the slider
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# (i.e. the scale is active) then the scale's value is adjusted
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# to reflect the mouse's position.
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#
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# Arguments:
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# w - The scale widget.
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# x, y - Mouse coordinates.
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proc ::tk::ScaleDrag {w x y} {
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variable ::tk::Priv
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if {!$Priv(dragging)} {
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return
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}
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$w set [$w get [expr {$x-$Priv(deltaX)}] [expr {$y-$Priv(deltaY)}]]
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}
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# ::tk::ScaleEndDrag --
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# This procedure is called to end an interactive drag of the
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# slider. It just marks the drag as over.
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#
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# Arguments:
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# w - The scale widget.
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proc ::tk::ScaleEndDrag {w} {
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variable ::tk::Priv
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set Priv(dragging) 0
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if {[info exists Priv($w,relief)]} {
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$w configure -sliderrelief $Priv($w,relief)
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unset Priv($w,relief)
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}
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}
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# ::tk::ScaleIncrement --
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# This procedure is invoked to increment the value of a scale and
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# to set up auto-repeating of the action if that is desired. The
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# way the value is incremented depends on the "dir" and "big"
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# arguments.
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#
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# Arguments:
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# w - The scale widget.
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# dir - "up" means move value towards -from, "down" means
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# move towards -to.
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# big - Size of increments: "big" or "little".
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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::ScaleIncrement {w dir big repeat} {
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variable ::tk::Priv
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if {![winfo exists $w]} return
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if {$big eq "big"} {
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set inc [$w cget -bigincrement]
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if {$inc == 0} {
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set inc [expr {abs([$w cget -to] - [$w cget -from])/10.0}]
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}
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if {$inc < [$w cget -resolution]} {
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set inc [$w cget -resolution]
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}
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} else {
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set inc [$w cget -resolution]
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}
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if {([$w cget -from] > [$w cget -to]) ^ ($dir eq "up")} {
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set inc [expr {-$inc}]
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}
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$w set [expr {[$w get] + $inc}]
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if {$repeat eq "again"} {
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set Priv(afterId) [after [$w cget -repeatinterval] \
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[list tk::ScaleIncrement $w $dir $big again]]
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} elseif {$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::ScaleIncrement $w $dir $big again]]
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}
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}
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}
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# ::tk::ScaleControlPress --
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# This procedure handles button presses that are made with the Control
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# key down. Depending on the mouse position, it adjusts the scale
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# value to one end of the range or the other.
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#
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# Arguments:
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# w - The scale widget.
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# x, y - Mouse coordinates where the button was pressed.
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proc ::tk::ScaleControlPress {w x y} {
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set el [$w identify $x $y]
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if {$el eq "trough1"} {
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$w set [$w cget -from]
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} elseif {$el eq "trough2"} {
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$w set [$w cget -to]
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}
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}
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# ::tk::ScaleButton2Down
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# This procedure is invoked when button 2 is pressed over a scale.
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# It sets the value to correspond to the mouse position and starts
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# a slider drag.
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#
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# Arguments:
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# w - The scrollbar widget.
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# x, y - Mouse coordinates within the widget.
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proc ::tk::ScaleButton2Down {w x y} {
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variable ::tk::Priv
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if {[$w cget -state] eq "disabled"} {
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return
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}
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$w configure -state active
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$w set [$w get $x $y]
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set Priv(dragging) 1
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set Priv(initValue) [$w get]
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set Priv($w,relief) [$w cget -sliderrelief]
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set coords "$x $y"
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set Priv(deltaX) 0
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set Priv(deltaY) 0
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}
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