GTK transition effects
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If you mean transition effects like hovering windows and dropdowns and then answer, you can't. These effects are the scope of the window manager. To get them you have to use a window manager with fancy effects like Compiz .
This also means that anyone using your application can use any window manager, so you cannot expect them to see the same effects. This is why you cannot program them in GTK.
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You can actually do this with Clutter and Clutter- GTK , which integrates GTK within Clutter.
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