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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*
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