nariyu memo

package jp.playwell.containers
{
    import flash.display.Graphics;
    import flash.display.Sprite;
    import flash.events.MouseEvent;
    import flash.geom.Rectangle;
 
    import mx.containers.Panel;
 
    public class ResizablePanel extends Panel
    {
        protected var resizeHandle:Sprite;
 
        public function ResizablePanel()
        {
            super();
        }
 
        //--------------------------------------
        // resizable
        //--------------------------------------
        private var _resizable:Boolean = true;
 
        [Bindable]
        [Inspectable(category="General",
            enumeration="true,false", defaultValue="true")]
        /**
         * resizable プロパティが true の場合、リサイズできます。
         * @default true
         */
        public function get resizable():Boolean
        {
            return _resizable;
        }
        public function set resizable(value:Boolean):void
        {
            _resizable = value;
            invalidateDisplayList();
        }
 
        //--------------------------------------
        // protected methods
        //--------------------------------------
        override protected function createChildren():void
        {
            super.createChildren();
 
            if (!resizeHandle)
            {
                resizeHandle = new Sprite();
                resizeHandle.alpha = 0.6;
 
                // ドラッグハンドルを描画
                var g:Graphics = resizeHandle.graphics;
                g.beginFill(0xFFFFFF, 0.0);
                g.drawRect(0, 0, 15, 15);
                g.endFill();
                g.lineStyle(0, 0x111111);
                g.moveTo(3, 14);
                g.lineTo(14, 3);
                g.moveTo(7, 14);
                g.lineTo(14, 7);
                g.moveTo(11, 14);
                g.lineTo(14, 11);
                g.lineStyle(0, 0xFFFFFF);
                g.moveTo(4, 14);
                g.lineTo(14, 4);
                g.moveTo(8, 14);
                g.lineTo(14, 8);
                g.moveTo(12, 14);
                g.lineTo(14, 12);
 
                rawChildren.addChild(resizeHandle);
 
                resizeHandle.addEventListener(MouseEvent.MOUSE_DOWN,
                    resizeHandle_mouseDownHandler);
            }
        }
 
        override protected function updateDisplayList(unscaledWidth:Number,
            unscaledHeight:Number):void
        {
            super.updateDisplayList(unscaledWidth, unscaledHeight);
 
            resizeHandle.visible = resizable;
            resizeHandle.x = unscaledWidth - resizeHandle.width;
            resizeHandle.y = unscaledHeight - resizeHandle.height;
        }
 
        //--------------------------------------
        // ドラッグ処理
        //--------------------------------------
        private var dragData:Rectangle;
        private function resizeHandle_mouseDownHandler(event:MouseEvent):void
        {
            dragData = new Rectangle(stage.mouseX, stage.mouseY,
                unscaledWidth, unscaledHeight);
            stage.addEventListener(MouseEvent.MOUSE_UP, stage_mouseUpHandler);
            stage.addEventListener(MouseEvent.MOUSE_MOVE, stage_mouseMoveHandler);
        }
        private function stage_mouseUpHandler(event:MouseEvent):void
        {
            dragData = null;
            stage.removeEventListener(MouseEvent.MOUSE_UP, stage_mouseUpHandler);
            stage.removeEventListener(MouseEvent.MOUSE_MOVE, stage_mouseMoveHandler);
        }
        private function stage_mouseMoveHandler(event:MouseEvent):void
        {
            if (!resizable) return;
            var w:Number = dragData.width + stage.mouseX - dragData.x;
            var h:Number = dragData.height + stage.mouseY - dragData.y;
 
            width = Math.min(maxWidth, Math.max(minWidth, resizeHandle.width, w));
            height = Math.min(maxHeight, Math.max(minHeight, resizeHandle.height, h));
        }
    }
}