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    <p>I found the solution in the code of the <em>gazpacho</em> interface designer.</p> <p>You can use this function:</p> <pre><code>def replace_widget(current, new): """ Replace one widget with another. 'current' has to be inside a container (e.g. gtk.VBox). """ container = current.parent assert container # is "current" inside a container widget? # stolen from gazpacho code (widgets/base/base.py): props = {} for pspec in gtk.container_class_list_child_properties(container): props[pspec.name] = container.child_get_property(current, pspec.name) gtk.Container.remove(container, current) container.add(new) for name, value in props.items(): container.child_set_property(new, name, value) </code></pre> <p>The key seems to be to transfer the child properties from the old widget to the new one after running <code>gtk.Container.add()</code>.</p> <p>Applied to your example, this would be:</p> <pre><code>import pygtk import gtk def replace_widget(current, new): """ Replace one widget with another. 'current' has to be inside a container (e.g. gtk.VBox). """ container = current.parent assert container # is "current" inside a container widget? # stolen from gazpacho code (widgets/base/base.py): props = {} for pspec in gtk.container_class_list_child_properties(container): props[pspec.name] = container.child_get_property(current, pspec.name) gtk.Container.remove(container, current) container.add(new) for name, value in props.items(): container.child_set_property(new, name, value) def destroy(widget, data=None): gtk.main_quit() def wrap_in_button(label): text = label.get_text() button = gtk.Button(text) replace_widget(label, button) def Main(): # Pretend that this chunk is actually replaced by GTKBuilder work # From here... window = gtk.Window() window.connect('destroy', destroy) box = gtk.VBox() window.add(box) label1 = gtk.Label("Label 1") label2 = gtk.Label("Label 2") label3 = gtk.Label("Label 3") box.pack_start(label1) box.pack_start(label2) box.pack_start(label3) # ...up to here wrap_in_button(label2) window.show_all() gtk.main() if __name__ == "__main__": Main() </code></pre> <p>This works for me using Python 2.6.6 and PyGTK 2.17.</p> <p>As a solution to your original problem, I used <code>label_set_autowrap()</code> <a href="https://stackoverflow.com/questions/1893748/pygtk-dynamic-label-wrapping/2016849#2016849">from here</a> and it worked most of the time. However, it's not a perfect solution as I wasn't able to correctly right-align auto-wrapped text.</p>
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