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The recipe covers how to use ClutterBindConstraint to bind actor sizes together. It gives some examples of where this approach is appropriate, as well as explaining an alternative using allocation-changed or notify::* signals. Three examples are given: 1. Resizing a texture to the stage. 2. Resizing a rectangle to act as a transparent overlay on top of a texture (using constraints). 3. Resizing a rectangle to act as a transparent overlay on top of a texture, but with a size proportional to the texture (using a handler connected to allocation-changed signals emitted by the texture).
