mirror of https://github.com/flutter/samples.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
29 lines
765 B
29 lines
765 B
// Copyright 2023 The Flutter Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
import 'dart:ui' as ui;
|
|
|
|
import 'package:flutter/material.dart';
|
|
|
|
class ShaderPainter extends CustomPainter {
|
|
ShaderPainter(this.shader, {this.update});
|
|
|
|
final ui.FragmentShader shader;
|
|
final void Function(ui.FragmentShader, Size)? update;
|
|
|
|
@override
|
|
void paint(Canvas canvas, Size size) {
|
|
update?.call(shader, size);
|
|
canvas.drawRect(
|
|
Rect.fromLTWH(0, 0, size.width, size.height),
|
|
Paint()..shader = shader,
|
|
);
|
|
}
|
|
|
|
@override
|
|
bool shouldRepaint(covariant ShaderPainter oldDelegate) {
|
|
return oldDelegate.shader != shader || oldDelegate.update != update;
|
|
}
|
|
}
|