3.2 View Interface
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Implementations of View include Window, Button, Canvas, Menu, and MenuItem. Since the implementable name of View is kept private, all implementations or View are part of the gui library.
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If the view has not been rendered, yet, View.gui_handle returns #false, while View.get_gui_handle throws an exception. The who argument to View.get_gui_handle is included in the exception message, if any.
A view might be rendered multiple times because it is nested multiple times within an enclosing view, or because render is used multiple time on the view or an enclosing view. Only the most recent rendering is accessible, even if it has become hidden and an older rendering is still active. See also Views, State, and Rendered Controls.
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