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In graphical user interfaces, one object has focus at a given time. This focused object is considered the active object, and as such displays special behavior. In Flash Player, the focused object is the recipient of any keyboard events and can display some kind of focus indicator if it was focused by the keyboard. (By default, this indicator is a yellow rectangle surrounding the object.) Additionally, SimpleButtons display their over state when focused. You can change Flash Player s focus with either the mouse or the Tab key. Focus can only be given to InteractiveObjects. You set focus with the mouse by clicking on an InteractiveObject, which becomes the new focus. Set can also focus with the keyboard by pressing Tab. The focus proceeds through InteractiveObjects as you repeatedly press Tab, repeating the cycle once it reaches the last object. The order these objects receive focus as you press Tab, or the tabbing order, is determined by Flash Player but can be overridden in ActionScript. As you change focus with either method, focus-related events are dispatched.
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The focus of Flash Player is determined by the Stage s focus property. This property is read-write, so you can set the focus by assigning a new InteractiveObject to it. When the focus property is null, no object has focus. Keyboard events are still received by the stage, however.
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Setting and retrieving the focus can be useful to enable and disable UI controls. It s especially useful for input text elds, because the text eld with focus is the one to receive keyboard input. In Example 21-12, I ll create a sample form and manipulate the focus to make it a bit more usable. EXAMPLE 21-12
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Manipulating Focus
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package { import flash.display.Sprite; import; import; import flash.text.*; import flash.ui.Keyboard; public class ch21ex12 extends Sprite { protected var input:TextField; protected var submitButton:TestButton; protected var clearButton:TestButton; public function ch21ex12() { input = new TextField(); input.type = TextFieldType.INPUT; input.defaultTextFormat = new TextFormat("_sans", 12, 0); input.width = 215; input.height = 20; input.border = true; addChild(input); input.x = 10; input.y = 10; input.addEventListener(KeyboardEvent.KEY_UP, onInputKey); submitButton = new TestButton(100, 30, "Submit"); addChild(submitButton); submitButton.x = 10; submitButton.y = 40; submitButton.addEventListener(MouseEvent.CLICK, onSubmit); clearButton = new TestButton(100, 30, "Clear"); addChild(clearButton); clearButton.x = 125; clearButton.y = 40; clearButton.addEventListener(MouseEvent.CLICK, onClear); stage.focus = input; } protected function onInputKey(event:KeyboardEvent):void { if (event.keyCode == Keyboard.ENTER) { onSubmit(null); } } protected function onSubmit(event:MouseEvent):void { stage.focus = null; submitButton.label.text = "Submitted!"; input.mouseEnabled = input.tabEnabled = false; input.background = true; input.backgroundColor = 0xb0b0b0; clearButton.removeEventListener(MouseEvent.CLICK, onClear); }
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protected function onClear(event:MouseEvent):void { input.text = ""; stage.focus = input; } } } import flash.display.*; import flash.text.*; class TestButton extends Sprite { public var label:TextField; public function TestButton(w:Number, h:Number, labelText:String) { graphics.lineStyle(0.5, 0, 0, true); graphics.beginFill(0xa0a0a0); graphics.drawRoundRect(0, 0, w, h, 8); label = new TextField(); addChild(label); label.defaultTextFormat = new TextFormat("_sans", 11, 0, true, false, false, null, null, "center"); label.width = w; label.height = h; label.text = labelText; label.y = (h - label.textHeight)/2 - 2; buttonMode = true; mouseChildren = false; } }
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There are a few things I ve done here with focus. I ve started the application with focus already in the input text eld. This means that as soon as you launch the application, you can start typing right away. (However, when the application is embedded in a web page, you ll still have to click somewhere in Flash Player to give it focus. Oh well.) Pressing Enter in the input text eld does the same thing as clicking the Submit button. Because the keyboard events are subscribed to input, only pressing Enter while it is focused triggers the submit process. Clicking the Clear button not only clears input, but it focuses it so that you can immediately type in new input without clicking on it. (You removed focus from the text eld when you clicked on the Clear button.) Submitting the form disables the input text eld. I ve done so by removing focus from it and preventing you from returning focus to it. Because the user can only focus an object by clicking or tabbing into it, disabling mouse events and turning off tabEnabled cut off these two possibilities. More on tabEnabled later.
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