User Guide

670 Chapter 7: ActionScript for Flash
Parameters
newListener
An object with an onSetFocus method.
Returns
None.
Description
Method; registers an object to receive keyboard focus change notifications. When the focus
changes (for example, whenever
Selection.setFocus() is invoked), all listening objects
registered with
addListener() have their onSetFocus method invoked. Multiple objects may
listen for focus change notifications. If the listener
newListener is already registered, no
change occurs.
Example
In the following example, you create two input text fields at runtime, setting the borders for each
text field to
true. This code creates a new (generic) ActionScript object named focusListener.
This object defines for itself an
onSetFocus property, to which it assigns a function. The function
takes two parameters: a reference to the text field that lost focus, and one to the text field that
gained focus. The function sets the
border property of the text field that lost focus to false, and
sets the border property of the text field that gained focus to
true:
this.createTextField("one_txt", 99, 10, 10, 200, 20);
this.createTextField("two_txt", 100, 10, 50, 200, 20);
one_txt.border = true;
one_txt.type = "input";
two_txt.border = true;
two_txt.type = "input";
var focusListener:Object = new Object();
focusListener.onSetFocus = function(oldFocus_txt, newFocus_txt) {
oldFocus_txt.border = false;
newFocus_txt.border = true;
};
Selection.addListener(focusListener);
When you test the SWF file, try using Tab to move between the two text fields. Make sure that
you select Control > Disable Keyboard Shortcuts so you can change focus between the two fields
using Tab.
Selection.getBeginIndex()
Availability
Flash Player 5.
Usage
Selection.getBeginIndex() : Number
Parameters
None.