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Add GradientRadial paintStyle implementation (flutter/engine#12081)

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Ferhat 2019-09-09 14:13:10 -07:00 committed by GitHub
parent c314ab5b5b
commit 173674166f
1 changed files with 17 additions and 1 deletions
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18
engine/src/flutter/lib/web_ui/lib/src/engine/shader.dart
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@ -162,6 +162,7 @@ class GradientLinear extends EngineGradient {
}
}
// TODO(flutter_web): Add screenshot tests when infra is ready.
class GradientRadial extends EngineGradient {
GradientRadial(this.center, this.radius, this.colors, this.colorStops,
this.tileMode, this.matrix4)
@ -176,7 +177,22 @@ class GradientRadial extends EngineGradient {
@override
Object createPaintStyle(html.CanvasRenderingContext2D ctx) {
throw UnimplementedError();
// TODO(flutter_web): see https://github.com/flutter/flutter/issues/32819
if (matrix4 != null && !Matrix4.fromFloat64List(matrix4).isIdentity()) {
throw UnimplementedError('matrix4 not supported in GradientRadial shader');
}
final html.CanvasGradient gradient =
ctx.createRadialGradient(center.dx, center.dy, 0, center.dx, center.dy, radius);
if (colorStops == null) {
assert(colors.length == 2);
gradient.addColorStop(0, colors[0].toCssString());
gradient.addColorStop(1, colors[1].toCssString());
return gradient;
}
for (int i = 0; i < colors.length; i++) {
gradient.addColorStop(colorStops[i], colors[i].toCssString());
}
return gradient;
}
@override