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51 行
1.5 KiB

using Unity.UIWidgets.foundation;
using Unity.UIWidgets.ui;
namespace Unity.UIWidgets.flow {
public class OpacityLayer : ContainerLayer {
Offset _offset;
public Offset offset {
set { this._offset = value; }
}
int _alpha;
public int alpha {
set { this._alpha = value; }
}
public override void preroll(PrerollContext context, Matrix3 matrix) {
var childMatrix = new Matrix3(matrix);
childMatrix.preTranslate(this._offset.dx, this._offset.dy); // TOOD: pre or post? https://github.com/flutter/engine/pull/7945
base.preroll(context, childMatrix);
var bounds = this.paintBounds.shift(this._offset);
this.paintBounds = bounds;
}
public override void paint(PaintContext context) {
D.assert(this.needsPainting);
var canvas = context.canvas;
canvas.save();
canvas.translate(this._offset.dx, this._offset.dy);
canvas.alignToPixel();
var saveLayerBounds = this.paintBounds.shift(-this._offset).roundOut();
var paint = new Paint {color = Color.fromARGB(this._alpha, 255, 255, 255)};
canvas.saveLayer(saveLayerBounds, paint);
try {
this.paintChildren(context);
}
finally {
canvas.restore();
canvas.restore();
}
}
}
}