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[platform-swt-dev] Re: (GTK2) EclipseFixed problem
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Hi,
To follow up on that a bit more after talking to Owen about it:
- Clipping of child widgets to the parent allocation isn't genuinely
guaranteed by GTK, and the reason is (as usual) the evil of widgets
with a GdkWindow; e.g. GtkEntry, GtkSpinButton. To clip child
widgets with a window you would need EclipseFixed to have a
window - which would result in a world of ugliness.
A third route is to have EclipseFixed optionally have a window or
not, depending on whether SWT knows that it will be placing child
widgets outside the extents of the EclipseFixed. I don't know
if this information is available.
- If you have child GTK_NO_WINDOW widgets that do not clip to
event->area correctly, you can hack around this by overriding
expose_event again in EclipseFixed, and calling
gdk_window_begin_paint_rect() with the intersection of the expose
area and the EclipseFixed allocation. (gtk_widget_intersect() can
be used to compute this I believe.) This has some efficiency cost.
However GTK widgets generally do clip to expose_event->area.
Havoc