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50 lines
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50 lines
2.0 KiB
Plaintext
From timj@gimp.org Sat Jan 24 19:15:22 1998
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Date: Sat, 24 Jan 1998 18:25:10 +0100 (CET)
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From: Tim Janik <timj@gimp.org>
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To: Peter Mattis <petm@xcf.berkeley.edu>
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Cc: Gtk+ Devils <gtkdev@gimp.org>
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Subject: widget destruction while in call
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hi peter and gtk+ devils ;)
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i've got the following problem, when double clicking on a list item
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it's window should be destroyed, because the selection is made.
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now this doesn't work 'cause the program is aborted with a
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BadWindow error (from X).
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this happens because the function that is connected to the lists
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button_press_event calls gtk_widget_destroy () on the main window.
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then the widget destruction is propagated through the tree until
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the list widget should be destroyed. but since the list widget is
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still GTK_IN_CALL (from the button_press_event) it isn't destroyed
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but only flagged as GTK_NEED_DESTROY. at this point the propagation
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stops, and nothing happends to the list widgets children.
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after the return of the button_press_event handler, the clicked
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list item is now selected/unselected (depends on the previous state).
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it therefore updates its GdkWindow (XWindow) by setting the new
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backgroundcolor (selected->blue/unselected->white). since it's
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parent XWindows are destroyed already the window which the list item
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wants to draw on is also destroyed. at this point the BadWindow error
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occours cause the XWindow handle has become invalid (the application
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already received a destroy notify).
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now, solutions might be:
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1) check for private->destroyed on *all* gdk call as it's done
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it a lot of places already, or
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2) propagate a widget unrealize signal through the tree before
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destroying a widget, or
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3) propagate GTK_NEED_DESTROY down the tree (not only flag the
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list container), this would require gtk_object_destroy() to
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return wether the object got actually destroyed or flagged
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only. then prohibit gdk operations on widgets flagged as
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GTK_NEED_DESTROY.
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i'm not sure what the best solution might be, but i tend to favour
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1) or 3).
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---
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ciaoTJ
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