Update Policies
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## Update Policies

The update policy of a `Range` widget defines at what points during user interaction it will change the `value` field of its `Gtk::Adjustment` and emit the `value_changed` signal. The update policies, set with the `set_update_policy()` method, are:

- `Gtk::UPDATE_CONTINUOUS` - This is the default. The `value_changed` signal is emitted continuously, i.e. whenever the slider is moved by even the tiniest amount.

- `Gtk::UPDATE_DISCONTINUOUS` - The `value_changed` signal is only emitted once the slider has stopped moving and the user has released the mouse button.

- `Gtk::UPDATE_DELAYED` - The `value_changed` signal is emitted when the user releases the mouse button, or if the slider stops moving for a short period of time.

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