jni/ruby/ext/tk/sample/tkextlib/tile/repeater.tcl


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#
# $Id: repeater.tcl 31689 2011-05-22 09:26:02Z nobu $
#
# 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*