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CHAPTER 4: User-Interface Tools Defining behavior with event callbacks and listeners 82

Simulating user events

You can simulate user actions by sending an event notification directly to a window or control with the

notify method. A script can use this method to generate events in the controls of a window, as if a user

was clicking buttons, entering text, or moving the window. If you have defined an event-handler callback

for the element, the

notify method invokes it.

The

notify method takes an optional argument that specifies which event it should simulate. If a control

can generate only one kind of event, notification generates that event by default.

The following controls generate the

onClick event:

Button

Checkbox

IconButton

RadioButton

The following controls generate the onChange event:

DropDownList

EditText

ListBox

Scrollbar

Slider

TreeView

The following controls generate the onChanging event:

EditText

Scrollbar

Slider

In the ListBox, double-clicking an item generates the onDoubleClick event.

RadioButton and Checkbox controls, the boolean value property automatically changes when the

user clicks the control. If you use

notify() to simulate a click, the value changes just as if the user had

clicked. For example, if the

value of a checkbox hasBtnsCb is true, this code changes the value to false:

if (dlg.hasBtnsCb.value == true) dlg.hasBtnsCb.notify();

// dlg.hasBtnsCb.value is now false

Registering event listeners for windows or controls

Another way to define the behavior of your windows and controls is register a handler function that

responds to a specific type of event in that window or control. This technique allows you to respond to the

cascading of an event through a hierarchy of containers and controls.

Use

windowObj.addEventListener() or controlObj.addEventListener() to register a handler. The function

you register receives an event object (from the UIEvent base class

) that encapsulates the event

information. As an event cascades down through a hierarchy and back up through the hierarchy, your

handler can respond at any level, or use the

UIEvent object’s stopPropagation() method to stop the event

propagation at some level.

You can register:

X The name of a handler function defined in the extension that takes one argument, the event object.

For example:

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