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windowsAgent/dist/tk/ttk/sizegrip.tcl

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+#
+# 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] widgetDefault
+    }
+    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(x)      $x
+    set State(y)      $y
+    set State(pressed) 1
+}
+
+proc ttk::sizegrip::Drag {W X Y} {
+    variable State
+    if {!$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 }
+    set x $State(x) ; set y $State(y)
+    wm geometry $State(toplevel) ${w}x${h}+${x}+${y}
+}
+
+proc ttk::sizegrip::Release {W X Y} {
+    variable State
+    set State(pressed) 0
+}
+
+#*EOF*