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Created __UI_UnloadSignal (markdown)

FellippeHeitor 2016-12-22 00:13:09 -02:00
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The [[global variable|Global variables]] __UI_UnloadSignal will be set to True if the user requested the program to be closed, either by clicking the X button on the title bar or by hitting Alt+F4 (Windows only).
In an [[BeforeUnload]] event, set this variable to False to cancel the quit request.