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48 行
1.4 KiB

using Unity.UIWidgets.foundation;
using Unity.UIWidgets.ui;
namespace Unity.UIWidgets.flow {
public class ClipRRectLayer : ContainerLayer {
RRect _clipRRect;
public RRect clipRRect {
set { this._clipRRect = value; }
}
public override void preroll(PrerollContext context, Matrix3 matrix) {
var previousCullRect = context.cullRect;
var clipPathBounds = this._clipRRect.outerRect;
context.cullRect = context.cullRect.intersect(clipPathBounds);
this.paintBounds = Rect.zero;
if (!context.cullRect.isEmpty) {
var childPaintBounds = Rect.zero;
this.prerollChildren(context, matrix, ref childPaintBounds);
childPaintBounds = childPaintBounds.intersect(clipPathBounds);
if (!childPaintBounds.isEmpty) {
this.paintBounds = childPaintBounds;
}
}
context.cullRect = previousCullRect;
}
public override void paint(PaintContext context) {
D.assert(this.needsPainting);
var canvas = context.canvas;
canvas.save();
canvas.clipRRect(this._clipRRect);
try {
this.paintChildren(context);
}
finally {
canvas.restore();
}
}
}
}