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#
# $Id: scrollbar.tcl,v 1.2 2007/11/17 19:17:50 jenglish Exp $
#
# Bindings for TScrollbar widget
#
# Still don't have a working ttk::scrollbar under OSX -
# Swap in a [tk::scrollbar] on that platform,
# unless user specifies -class or -style.
#
if {[tk windowingsystem] eq "aqua"} {
rename ::ttk::scrollbar ::ttk::_scrollbar
proc ttk::scrollbar {w args} {
set constructor ::scrollbar
foreach {option _} $args {
if {$option eq "-class" || $option eq "-style"} {
set constructor ::ttk::_scrollbar
break
}
}
return [eval [linsert $args 0 $constructor $w]]
}
}
namespace eval ttk::scrollbar {
variable State
# State(xPress) --
# State(yPress) -- initial position of mouse at start of drag.
# State(first) -- value of -first at start of drag.
}
bind TScrollbar <ButtonPress-1> { ttk::scrollbar::Press %W %x %y }
bind TScrollbar <B1-Motion> { ttk::scrollbar::Drag %W %x %y }
bind TScrollbar <ButtonRelease-1> { ttk::scrollbar::Release %W %x %y }
bind TScrollbar <ButtonPress-2> { ttk::scrollbar::Jump %W %x %y }
bind TScrollbar <B2-Motion> { ttk::scrollbar::Drag %W %x %y }
bind TScrollbar <ButtonRelease-2> { ttk::scrollbar::Release %W %x %y }
proc ttk::scrollbar::Scroll {w n units} {
set cmd [$w cget -command]
if {$cmd ne ""} {
uplevel #0 $cmd scroll $n $units
}
}
proc ttk::scrollbar::Moveto {w fraction} {
set cmd [$w cget -command]
if {$cmd ne ""} {
uplevel #0 $cmd moveto $fraction
}
}
proc ttk::scrollbar::Press {w x y} {
variable State
set State(xPress) $x
set State(yPress) $y
switch -glob -- [$w identify $x $y] {
*uparrow -
*leftarrow {
ttk::Repeatedly Scroll $w -1 units
}
*downarrow -
*rightarrow {
ttk::Repeatedly Scroll $w 1 units
}
*thumb {
set State(first) [lindex [$w get] 0]
}
*trough {
set f [$w fraction $x $y]
if {$f < [lindex [$w get] 0]} {
# Clicked in upper/left trough
ttk::Repeatedly Scroll $w -1 pages
} elseif {$f > [lindex [$w get] 1]} {
# Clicked in lower/right trough
ttk::Repeatedly Scroll $w 1 pages
} else {
# Clicked on thumb (???)
set State(first) [lindex [$w get] 0]
}
}
}
}
proc ttk::scrollbar::Drag {w x y} {
variable State
if {![info exists State(first)]} {
# Initial buttonpress was not on the thumb,
# or something screwy has happened. In either case, ignore:
return;
}
set xDelta [expr {$x - $State(xPress)}]
set yDelta [expr {$y - $State(yPress)}]
Moveto $w [expr {$State(first) + [$w delta $xDelta $yDelta]}]
}
proc ttk::scrollbar::Release {w x y} {
variable State
unset -nocomplain State(xPress) State(yPress) State(first)
ttk::CancelRepeat
}
# scrollbar::Jump -- ButtonPress-2 binding for scrollbars.
# Behaves exactly like scrollbar::Press, except that
# clicking in the trough jumps to the the selected position.
#
proc ttk::scrollbar::Jump {w x y} {
variable State
switch -glob -- [$w identify $x $y] {
*thumb -
*trough {
set State(first) [$w fraction $x $y]
Moveto $w $State(first)
set State(xPress) $x
set State(yPress) $y
}
default {
Press $w $x $y
}
}
}
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