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+#
+# $Id$
+#
+# Demonstration of custom classes.
+#
+# The Tile button doesn't have built-in support for autorepeat.
+# Instead of adding -repeatdelay and -repeatinterval options,
+# and all the extra binding scripts required to deal with them,
+# we create a custom widget class for autorepeating buttons.
+#
+# Usage:
+#	ttk::button .b -class Repeater [... other options ...]
+#
+# TODO:
+#	Use system settings for repeat interval and initial delay.
+#
+# Notes:
+#	Repeater buttons work more like scrollbar arrows than
+#	Tk repeating buttons: they fire once immediately when
+#	first pressed, and $State(delay) specifies the initial 
+#	interval before the button starts autorepeating.
+#
+
+namespace eval tile::Repeater {
+    variable State
+    set State(timer) 	{}	;# [after] id of repeat script
+    set State(interval)	100	;# interval between repetitions
+    set State(delay)	300	;# delay after initial invocation
+}
+
+### Class bindings.
+#
+
+bind Repeater <Enter>		{ %W state active }
+bind Repeater <Leave>		{ %W state !active }
+
+bind Repeater <Key-space> 	{ tile::Repeater::Activate %W }
+bind Repeater <<Invoke>> 	{ tile::Repeater::Activate %W }
+
+bind Repeater <ButtonPress-1> 	{ tile::Repeater::Press %W }
+bind Repeater <ButtonRelease-1> { tile::Repeater::Release %W }
+bind Repeater <B1-Leave> 	{ tile::Repeater::Pause %W }
+bind Repeater <B1-Enter> 	{ tile::Repeater::Resume %W } ;# @@@ see below
+
+# @@@ Workaround for metacity-induced bug:
+bind Repeater <B1-Enter> \
+    { if {"%d" ne "NotifyUngrab"} { tile::Repeater::Resume %W } }
+
+### Binding procedures.
+#
+
+## Activate -- Keyboard activation binding. 
+#	Simulate clicking the button, and invoke the command once. 
+#
+proc tile::Repeater::Activate {w} {
+    $w instate disabled { return }
+    set oldState [$w state pressed]
+    update idletasks; after 100
+    $w state $oldState
+    after idle [list $w invoke]
+}
+
+## Press -- ButtonPress-1 binding.
+#	Invoke the command once and start autorepeating after 
+#	$State(delay) milliseconds.
+#
+proc tile::Repeater::Press {w} {
+    variable State
+    $w instate disabled { return }
+    $w state pressed
+    $w invoke
+    after cancel $State(timer)
+    set State(timer) [after $State(delay) [list tile::Repeater::Repeat $w]]
+}
+
+## Release -- ButtonRelease binding.
+#	Stop repeating.
+#
+proc tile::Repeater::Release {w} {
+    variable State
+    $w state !pressed
+    after cancel $State(timer)
+}
+
+## Pause -- B1-Leave binding
+#	Temporarily suspend autorepeat.
+#
+proc tile::Repeater::Pause {w} {
+    variable State
+    $w state !pressed
+    after cancel $State(timer)
+}
+
+## Resume -- B1-Enter binding
+#	Resume autorepeat.
+#
+proc tile::Repeater::Resume {w} {
+    variable State
+    $w instate disabled { return }
+    $w state pressed
+    $w invoke
+    after cancel $State(timer)
+    set State(timer) [after $State(interval) [list tile::Repeater::Repeat $w]]
+}
+
+## Repeat -- Timer script
+#	Invoke the command and reschedule another repetition 
+#	after $State(interval) milliseconds.
+#
+proc tile::Repeater::Repeat {w} {
+    variable State
+    $w instate disabled { return }
+    $w invoke
+    set State(timer) [after $State(interval) [list tile::Repeater::Repeat $w]]
+}
+
+#*EOF*