21: Interactivity with the Mouse and Keyboard in Java

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21: Interactivity with the Mouse and Keyboard
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TABLE 21-3
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Built-In Context Menu Items
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Label Permanent Appears in Function
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Zoom In Zoom Out 100% Show All Quality Print... Play Loop Rewind Forward Back Cut Copy Paste Delete Select All Show Redraw Regions Debugger Settings... About Adobe Flash Player [version]...
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No No No No No No No No No No No No No No No No Yes Yes Yes Yes
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Normal menu Normal menu Normal menu Normal menu Normal menu Normal menu Multiframe SWFs Multiframe SWFs Multiframe SWFs Multiframe SWFs Multiframe SWFs TextField menu TextField menu TextField menu TextField menu TextField menu Debug Player Debug Player Always Always
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Zooms in Zooms out Zooms to normal level Zooms to show entire stage Shows quality submenu to change stage rendering quality Launches Print dialog to print whole contents of stage Toggles playback of main timeline Toggles looping of main timeline Moves the playhead to the beginning of the timeline and rst scene Moves to the next scene or frame Moves to the previous scene or frame Cuts selected text Copies selected text Pastes text Deletes selected text Selects all text Toggles highlighting of dirty rects Opens dialog to connect to debugger Opens settings panel inside Flash Player Launches About dialog box
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The constructor of ContextMenuItem optionally lets you set all these properties at once. It has the method signature:
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function ContextMenuItem(caption:String, separatorBefore:Boolean = false, enabled:Boolean = true, visible:Boolean = true)
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You must at least set the caption or label of the menu item. The other options are usually correct by default.
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Part IV: Event-Driven Programming
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Let s put all this together in Example 21-13, which revisits the cloning circles from Example 21-6. Instead of cloning by Shift-dragging, I ll add a context menu to all circles with a menu item to create a new one. I ll also customize the default context menu to include an Arrange All option, which will arrange the circles in a grid.
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EXAMPLE 21-13
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http://actionscriptbible.com/ch21/ex13
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Context Menus
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package { import flash.display.*; import flash.events.*; import flash.geom.Point; import flash.ui.*; [SWF(backgroundColor="0")] public class ch21ex13 extends Sprite { public function ch21ex13() { var circ:DraggableCircle = new DraggableCircle(); circ.x = circ.y = 100; addChild(circ); var menu:ContextMenu = new ContextMenu(); menu.hideBuiltInItems(); var item:ContextMenuItem; item = new ContextMenuItem("Arrange all"); item.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, onArrange); menu.customItems.push(item); contextMenu = menu; } protected function onArrange(event:ContextMenuEvent):void { for (var i:int = 0, x:Number = 50, y:Number = 50; i < numChildren; i++) { var circ:DisplayObject = getChildAt(i); circ.x = x; circ.y = y; if ((x += 50) > stage.stageWidth) {x = 0; y += 50;} } } } } import flash.display.*; import flash.events.*; import flash.ui.*; class DraggableCircle extends Sprite { public function DraggableCircle() { graphics.beginFill(makeColor(), 0.5); graphics.drawCircle(0, 0, 50); graphics.endFill(); addEventListener(MouseEvent.MOUSE_DOWN, onStartDrag); buttonMode = true; blendMode = BlendMode.ADD; var menu:ContextMenu = new ContextMenu(); menu.hideBuiltInItems();
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21: Interactivity with the Mouse and Keyboard
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var item:ContextMenuItem = new ContextMenuItem("Clone"); item.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, onClone); menu.customItems.push(item); contextMenu = menu; } protected function makeColor():uint { var rnd:Function = function():uint{return uint(Math.random() * 256)}; return (rnd() << 16 | rnd() << 8 | rnd()); } protected function onStartDrag(event:MouseEvent):void { startDrag(); stage.addEventListener(MouseEvent.MOUSE_UP, onStopDrag); } protected function onStopDrag(event:MouseEvent):void { stage.removeEventListener(MouseEvent.MOUSE_UP, onStopDrag); stopDrag(); } public function onClone(event:ContextMenuEvent):void { var copy:DraggableCircle = new DraggableCircle(); copy.x = this.x + 10; copy.y = this.y + 10; this.parent.addChild(copy); } }
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In the example, you can see both object-speci c context menus and default context menus in action, as well as the stripped-down built-in context menu.
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Summary
ActionScript s event system handles mouse and keyboard events, as instances of MouseEvent and KeyboardEvent. Mouse events set their target to the topmost, visible, nonempty InteractiveObject that responds to mouse input. Keyboard events set their target to the focused object. Both mouse and keyboard events bubble and can be canceled. Listen to stage to get all mouse or keyboard events regardless of mouse position and focus.
mouseEnabled, mouseChildren, tabEnabled, and tabChildren properties make the
display object invisible to or opaque to mouse and focus events. Single clicks and double clicks dispatch their own events, although double clicks require doubleClickEnabled to be set. Mouse events carry information about the position of the cursor with them, as well as any keyboard modi er keys that were held down.