EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificações descarregar pdf (Página 81)

CHAPTER 4: User-Interface Tools Defining behavior with event callbacks and listeners 81

Button, RadioButton, and Checkbox controls generate events when the user clicks within the control

bounds. To handle the event, define a callback function for onClick

X EditText, Scrollbar, and Slider controls generate events when the content or value changes—that is,

when the user types into an edit field, or moves the scroll or slider indicator. To handle these events,

define callback functions for onChange

and onChanging.

X ListBox, DropDownList, and TreeView controls generate events whenever the selection in the list

changes. To handle the event, define a callback function for onChange

. The TreeView control also

generates events when the user expands or collapses a node, handled by the onExpand

and

onCollapse

callback functions.

X The ListBox also generates an event when the user double-clicks an item. To handle it, define a

callback function for the onDoubleClick

event.

X Both containers and controls generate events just before they are drawn, that allow you to customize

their appearance. To handle these events, define callback functions for onDraw

. Your handler can

modify or control how the container or control is drawn using the methods defined in the control’s

associated ScriptUIGraphics object

X In Windows only, you can register a key sequence as a shortcutKey for a window or for most types of

controls. To handle the key sequence, define a callback function for onShortcutKey

in that control.

Defining event-handler callback functions

Your script can define an event handler as a named function referenced by the callback property, or as an

unnamed function defined inline in the callback property.

X If you define a named function, assign its name as the value of the corresponding callback property.

For example:

function hasBtnsCbOnClick() { /* do something interesting */ }

hasBtnsCb.onClick = hasBtnsCbOnClick;

X For a simple, unnamed function, set the property value directly to the function definition:

UI-element.callback-name = function () { handler-definition};

Event-handler functions take no arguments.

For example, the following sets the

onClick property of the hasBtnsCb checkbox to a function that

enables another control in the same dialog:

hasBtnsCb.onClick = function ()

{ this.parent.alertBtnsPnl.enabled = this.value; };

The following statements set the onClick event handlers for buttons that close the containing dialog,

returning different values to the

show method that invoked the dialog, so the calling script can tell which

button was clicked:

buildBtn.onClick = function () { this.parent.parent.close(1); };

cancelBtn.onClick = function () { this.parent.parent.close(2); };

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