Johan Dahlin wrote: > David E. Konerding wrote: > >> Hi folks, >> >> I am trying to build a custom container. This container is like a >> layout, but it doesn't manage its own bin_window (since I can't for >> the life of my find a way to make a gtk.Widget have a transparent >> background so that stuff drawn to the parent of the widget gets >> occluded by the container's gtk.gdk.Window). > > > I did something similar to this during the last weekend, > I also refactored the interesting parts into an example, to be able to > copy/paste from when you want to implement a scrollable container. > > http://cvs.gnome.org/viewcvs/gnome-python/pygtk/examples/gtk/scrollable.py?view=markup > > > Does that help you? >
Hi Johan, I adapted the example you listed, basically removing any code that had to do with the custom Container having a window or a bin window. Instead, the child gets added to the bin_window of the custom Container's parent. This gets me *really* close, except that when I attempt to adjust the child widget's x, y by adding in the coordinates of the custom Container on its parent, I get some ugly gtk runtime exceptions when the custom Container attempts to propage its expose event to its children (child->parent == GTK_WIDGET(container) assert fails). I wonder if my attempt to reach my goal this way is just the wrong idea. My goal is an app with a gtk.Layout with draggable objects (basic non-zoomable canvas). The draggable objects are usually images with transparency information. However, now I want to make some custom objects which are "composites" of several gtk.Widgets that all drag together. Orignally I attempted to use a gtk.Layout (child of the Canvas gtk.Layout) that contains all the items of the composite widget. But the problem there is that the gtk.Layout obscures any drawing I do to the parent canvas (I use "draw_lines" to draw lines on the canvas connecting draggable objects). I've attached an example of what I mean: actually, the Frame object seems to work ok, in that the line drawn on the outer canvas actually covers the Frame. However, the "composite" object completely occludes the underlying line. I've tried to play with transparent pixmap backgrounds for the inner layout, but haven't had any luck. Dave
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