124 lines
3 KiB
Tcl
124 lines
3 KiB
Tcl
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#
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# Bindings for TScrollbar widget
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#
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# Still don't have a working ttk::scrollbar under OSX -
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# Swap in a [tk::scrollbar] on that platform,
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# unless user specifies -class or -style.
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#
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if {[tk windowingsystem] eq "aqua"} {
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rename ::ttk::scrollbar ::ttk::_scrollbar
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proc ttk::scrollbar {w args} {
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set constructor ::tk::scrollbar
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foreach {option _} $args {
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if {$option eq "-class" || $option eq "-style"} {
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set constructor ::ttk::_scrollbar
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break
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}
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}
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return [$constructor $w {*}$args]
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}
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}
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namespace eval ttk::scrollbar {
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variable State
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# State(xPress) --
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# State(yPress) -- initial position of mouse at start of drag.
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# State(first) -- value of -first at start of drag.
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}
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bind TScrollbar <ButtonPress-1> { ttk::scrollbar::Press %W %x %y }
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bind TScrollbar <B1-Motion> { ttk::scrollbar::Drag %W %x %y }
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bind TScrollbar <ButtonRelease-1> { ttk::scrollbar::Release %W %x %y }
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bind TScrollbar <ButtonPress-2> { ttk::scrollbar::Jump %W %x %y }
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bind TScrollbar <B2-Motion> { ttk::scrollbar::Drag %W %x %y }
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bind TScrollbar <ButtonRelease-2> { ttk::scrollbar::Release %W %x %y }
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proc ttk::scrollbar::Scroll {w n units} {
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set cmd [$w cget -command]
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if {$cmd ne ""} {
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uplevel #0 $cmd scroll $n $units
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}
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}
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proc ttk::scrollbar::Moveto {w fraction} {
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set cmd [$w cget -command]
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if {$cmd ne ""} {
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uplevel #0 $cmd moveto $fraction
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}
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}
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proc ttk::scrollbar::Press {w x y} {
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variable State
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set State(xPress) $x
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set State(yPress) $y
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switch -glob -- [$w identify $x $y] {
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*uparrow -
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*leftarrow {
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ttk::Repeatedly Scroll $w -1 units
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}
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*downarrow -
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*rightarrow {
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ttk::Repeatedly Scroll $w 1 units
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}
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*thumb {
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set State(first) [lindex [$w get] 0]
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}
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*trough {
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set f [$w fraction $x $y]
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if {$f < [lindex [$w get] 0]} {
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# Clicked in upper/left trough
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ttk::Repeatedly Scroll $w -1 pages
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} elseif {$f > [lindex [$w get] 1]} {
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# Clicked in lower/right trough
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ttk::Repeatedly Scroll $w 1 pages
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} else {
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# Clicked on thumb (???)
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set State(first) [lindex [$w get] 0]
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}
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}
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}
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}
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proc ttk::scrollbar::Drag {w x y} {
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variable State
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if {![info exists State(first)]} {
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# Initial buttonpress was not on the thumb,
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# or something screwy has happened. In either case, ignore:
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return;
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}
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set xDelta [expr {$x - $State(xPress)}]
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set yDelta [expr {$y - $State(yPress)}]
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Moveto $w [expr {$State(first) + [$w delta $xDelta $yDelta]}]
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}
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proc ttk::scrollbar::Release {w x y} {
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variable State
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unset -nocomplain State(xPress) State(yPress) State(first)
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ttk::CancelRepeat
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}
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# scrollbar::Jump -- ButtonPress-2 binding for scrollbars.
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# Behaves exactly like scrollbar::Press, except that
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# clicking in the trough jumps to the the selected position.
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#
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proc ttk::scrollbar::Jump {w x y} {
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variable State
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switch -glob -- [$w identify $x $y] {
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*thumb -
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*trough {
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set State(first) [$w fraction $x $y]
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Moveto $w $State(first)
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set State(xPress) $x
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set State(yPress) $y
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}
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default {
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Press $w $x $y
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}
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}
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}
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