在flex4裡面的spark組件的panel是沒有內建拖動的功能的
因此若我們希望這物件要可以被拖動
我們必須要去自己實做當使用者拖動topGroup的區塊時的拖動動作
範例程式碼如下:
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package components { import flash.events.MouseEvent; import mx.managers.DragManager; import spark.components.Group; import spark.components.Panel; /** * A simple extension of the Spark Panel component * that enables dragging. */ public class DraggablePanel extends Panel { //-------------------------------------- // Constructor //-------------------------------------- public function DraggablePanel() { super(); } //-------------------------------------- // Skin Parts //-------------------------------------- /** * The skin part that represents the title bar of the underlying Panel. * NOTE: The default PanelSkin already has this, it's just not defined as a skinPart in the Panel class. * We want it so that we can capture dragging. */ [SkinPart(required="true")] public var topGroup:Group; //-------------------------------------- // Overridden Methods //-------------------------------------- protected override function partAdded( partName:String, instance:Object ) : void { super.partAdded( partName, instance ); if (instance == topGroup) { Group( instance ).addEventListener( MouseEvent.MOUSE_DOWN, topGroup_mouseDownHandler ); Group( instance ).addEventListener( MouseEvent.MOUSE_UP, topGroup_mouseUpHandler ); } } protected override function partRemoved( partName:String, instance:Object ) : void { super.partRemoved( partName, instance ); if (instance == topGroup) { Group( instance ).removeEventListener( MouseEvent.MOUSE_DOWN, topGroup_mouseDownHandler ); Group( instance ).removeEventListener( MouseEvent.MOUSE_UP, topGroup_mouseUpHandler ); } } //-------------------------------------- // Event Handlers //-------------------------------------- protected function topGroup_mouseDownHandler( event:MouseEvent ):void { if ( !DragManager.isDragging ) startDrag(); } protected function topGroup_mouseUpHandler( event:MouseEvent ):void { stopDrag(); } } |