- - The UIElement class is the base class for all user interface elements - such as views and controls. Don't instantiate UIElement directly but rather - use one of its subclasses. -
- --[Array] UIElement.getEventListeners(void)- -
- - Allows retrieval of the currently registered event listeners for this user interface element. -
- -- - This method does not take any arguments. -
- -- - An array of event listeners currently registered to the user interface element. -
- --[void] UIElement.addEventListener(String eventType, Function listener)- -
- - Allows registration of a callback function to a user interface element in order to get - notifications of events in the user interface element. Event registration can be done - for a specific type of event or for all events. -
- --eventType
- - - -- - The name of the event type the listener should be called for or null if - all event types. The available event type names depend on the actual user - interface element class that this method is caled for. -
- -- - The most common event type names are ActionPerformed for button control clicks, - SelectionChanged for selection controls, FocusStateChanged for all controls to - indicate that focus was gained or lost and FocusedControlChanged for views to - announce that a new control has been brought into (or out of) focus. -
- - --listener
- - - -- - The function that should be called when the specified event type occurs. - The function should be defined with a single argument that will receive the - event object. The object has three properties: source, type and value. The - source property specifies the user interface element (e.g. control) from where - the event originated. The type property contains the event type name. The - contents of the value property depends between event types but contains - additional information about the event. For example if the value changes in - a selection control then the value property contains the new value. -
- - -- - This method does not return a value. -
- --[void] UIElement.removeEventListener(String eventType, Function listener)- -
- - Allows a specific event listener to be unregistered from a user interface control. -
- --eventType
- - - -- - The event type name of the listener that should be removed. Use the exact - same event type name as when adding the event listener. -
- - --listener
- - - -- - The callback function of the listener that should be removed. -
- - -- - This method does not return a value. -
- --[String] UIElement.id- -
- - The id property is a unique identifier for the user interface element. - The identifier is used for the root HTML element in the element hierarchy - that defines the user interface element and is useful for example in - specifying specific CSS rules for a particular user interface element. - The identifier can also be used to recognize the source of an event in an - event callback by accessing the id property of the source property in the - event object passed to the event listener callback. -
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