override public void Draw(FairyBatch batch)
        {
            base.Draw(batch);

            if (_paintingMode != 0 && paintingGraphics.texture != null)
            {
                batch.PushRenderTarget(paintingGraphics.texture,
                                       Vector2.Transform(Vector2.Zero, _localToWorldMatrix) + new Vector2(_paintingMargin.left, _paintingMargin.top));
            }

            if (_clipRect != null)
            {
                //在这里可以直接使用 _localToWorldMatrix, 因为已经更新
                Rectangle clipRect = (Rectangle)_clipRect;
                Matrix    mat      = Matrix.Identity;
                ToolSet.TransformRect(ref clipRect, ref _localToWorldMatrix, ref mat);
                batch.EnterClipping(clipRect);
            }

            float savedAlpha = batch.alpha;

            batch.alpha *= this.alpha;
            bool savedGrayed = batch.grayed;

            batch.grayed = batch.grayed || this.grayed;

            int cnt = _children.Count;

            for (int i = 0; i < cnt; i++)
            {
                DisplayObject child = _children[i];
                if (child.visible)
                {
                    child.Draw(batch);
                }
            }

            if (_clipRect != null)
            {
                batch.LeaveClipping();
            }

            if (_paintingMode != 0 && paintingGraphics.texture != null)
            {
                batch.PopRenderTarget();
                batch.Draw(paintingGraphics, 1, false, _blendMode, ref _localToWorldMatrix, _filter);
            }

            batch.alpha  = savedAlpha;
            batch.grayed = savedGrayed;
        }