public static class DelegatingKeyboardListenerCollection extends Object
KeyboardListenerCollection
used to correctly hook up event listeners
to the composite's wrapped widget.
For example, Composite
widgets often need to listen to events
generated on their wrapped widget. Upon the firing of a wrapped widget's
event, the composite widget must fire its own listeners with itself as the
source of the event. To use a DelegatingKeyboardListenerCollection
,
simply use the DelegatingKeyboardListenerCollection
instead of a
KeyboardListenerCollection
. For example, in SuggestBox
, the
following code is used to listen to keyboard events on the SuggestBox
underlying widget.
public void addKeyboardListener(KeyboardListener listener) { if (keyboardListeners == null) { keyboardListeners = new DelegatingKeyboardListenerCollection(this, box); } keyboardListeners.add(listener); }
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