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47 行
1.4 KiB
47 行
1.4 KiB
using Unity.UIWidgets.foundation;
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using Unity.UIWidgets.ui;
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namespace Unity.UIWidgets.flow {
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public class ClipPathLayer : ContainerLayer {
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Path _clipPath;
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public Path clipPath {
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set { this._clipPath = value; }
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}
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public override void preroll(PrerollContext context, Matrix3 matrix) {
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var previousCullRect = context.cullRect;
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var clipPathBounds = this._clipPath.getBounds();
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context.cullRect = context.cullRect.intersect(clipPathBounds);
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this.paintBounds = Rect.zero;
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if (!context.cullRect.isEmpty) {
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var childPaintBounds = Rect.zero;
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this.prerollChildren(context, matrix, ref childPaintBounds);
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childPaintBounds = childPaintBounds.intersect(clipPathBounds);
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if (!childPaintBounds.isEmpty) {
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this.paintBounds = childPaintBounds;
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}
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}
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context.cullRect = previousCullRect;
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}
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public override void paint(PaintContext context) {
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D.assert(this.needsPainting);
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var canvas = context.canvas;
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canvas.save();
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canvas.clipPath(this._clipPath);
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try {
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this.paintChildren(context);
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} finally {
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canvas.restore();
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}
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}
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}
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}
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