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#
# $Id: sizegrip.tcl,v 1.3 2008/10/28 20:02:03 jenglish Exp $
#
# Sizegrip widget bindings.
#
# Dragging a sizegrip widget resizes the containing toplevel.
#
# NOTE: the sizegrip widget must be in the lower right hand corner.
#
switch -- [tk windowingsystem] {
x11 -
win32 {
option add *TSizegrip.cursor [ttk::cursor seresize]
}
aqua {
# Aqua sizegrips use default Arrow cursor.
}
}
namespace eval ttk::sizegrip {
variable State
array set State {
pressed 0
pressX 0
pressY 0
width 0
height 0
widthInc 1
heightInc 1
resizeX 1
resizeY 1
toplevel {}
}
}
bind TSizegrip <ButtonPress-1> { ttk::sizegrip::Press %W %X %Y }
bind TSizegrip <B1-Motion> { ttk::sizegrip::Drag %W %X %Y }
bind TSizegrip <ButtonRelease-1> { ttk::sizegrip::Release %W %X %Y }
proc ttk::sizegrip::Press {W X Y} {
variable State
if {[$W instate disabled]} { return }
set top [winfo toplevel $W]
# If the toplevel is not resizable then bail
foreach {State(resizeX) State(resizeY)} [wm resizable $top] break
if {!$State(resizeX) && !$State(resizeY)} {
return
}
# Sanity-checks:
# If a negative X or Y position was specified for [wm geometry],
# just bail out -- there's no way to handle this cleanly.
#
if {[scan [wm geometry $top] "%dx%d+%d+%d" width height _x _y] != 4} {
return;
}
# Account for gridded geometry:
#
set grid [wm grid $top]
if {[llength $grid]} {
set State(widthInc) [lindex $grid 2]
set State(heightInc) [lindex $grid 3]
} else {
set State(widthInc) [set State(heightInc) 1]
}
set State(toplevel) $top
set State(pressX) $X
set State(pressY) $Y
set State(width) $width
set State(height) $height
set State(pressed) 1
}
proc ttk::sizegrip::Drag {W X Y} {
variable State
if {!$State(pressed)} { return }
set w $State(width)
set h $State(height)
if {$State(resizeX)} {
set w [expr {$w + ($X - $State(pressX))/$State(widthInc)}]
}
if {$State(resizeY)} {
set h [expr {$h + ($Y - $State(pressY))/$State(heightInc)}]
}
if {$w <= 0} { set w 1 }
if {$h <= 0} { set h 1 }
wm geometry $State(toplevel) ${w}x${h}
}
proc ttk::sizegrip::Release {W X Y} {
variable State
set State(pressed) 0
}
#*EOF*
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