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April 12, 2019 20:52
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Why is it so hard to get a debounced key sequence in TCL/Tk?
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| set pending_release {} | |
| set pressed false | |
| proc press_action {} { puts "pressed" } | |
| proc release_action {} { puts "released" } | |
| proc is_pressed {} { | |
| global pressed | |
| return $pressed | |
| } | |
| proc set_pressed {{value true}} { | |
| global pressed | |
| set pressed $value | |
| } | |
| proc onPress {} { | |
| if { ! [is_pressed] } { | |
| set_pressed | |
| press_action | |
| } | |
| } | |
| proc release_callback {} { | |
| set_pressed false | |
| global pending_release | |
| set pending_release {} | |
| release_action | |
| } | |
| proc onRelease {} { | |
| global pending_release | |
| if { [string length pending_release] > 0 } { | |
| after cancel $pending_release | |
| } | |
| set pending_release [after 100 release_callback] | |
| } | |
| # Bind "?" | |
| bind . <KeyPress-question> { onPress } | |
| bind . <KeyRelease-question> { onRelease } |
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