mirror of
https://github.com/flutter/flutter
synced 2024-10-13 19:52:53 +00:00
948ae15ca5
Our examples have been growing organically over time. This patch cleans them up to illustrate specific aspects of Flutter.
80 lines
2.4 KiB
Dart
80 lines
2.4 KiB
Dart
// Copyright 2015 The Chromium 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 'dart:typed_data';
|
|
|
|
import 'package:mojo/bindings.dart' as bindings;
|
|
import 'package:mojo/core.dart' as core;
|
|
import 'package:sky_services/pointer/pointer.mojom.dart';
|
|
|
|
ui.Color color;
|
|
|
|
ui.Picture paint(ui.Rect paintBounds) {
|
|
ui.PictureRecorder recorder = new ui.PictureRecorder();
|
|
ui.Canvas canvas = new ui.Canvas(recorder, paintBounds);
|
|
ui.Size size = paintBounds.size;
|
|
|
|
double radius = size.shortestSide * 0.45;
|
|
ui.Paint paint = new ui.Paint()..color = color;
|
|
canvas.drawCircle(size.center(ui.Point.origin), radius, paint);
|
|
|
|
return recorder.endRecording();
|
|
}
|
|
|
|
ui.Scene composite(ui.Picture picture, ui.Rect paintBounds) {
|
|
final double devicePixelRatio = ui.window.devicePixelRatio;
|
|
ui.Rect sceneBounds = new ui.Rect.fromLTWH(
|
|
0.0,
|
|
0.0,
|
|
ui.window.size.width * devicePixelRatio,
|
|
ui.window.size.height * devicePixelRatio
|
|
);
|
|
Float64List deviceTransform = new Float64List(16)
|
|
..[0] = devicePixelRatio
|
|
..[5] = devicePixelRatio
|
|
..[10] = 1.0
|
|
..[15] = 1.0;
|
|
ui.SceneBuilder sceneBuilder = new ui.SceneBuilder(sceneBounds)
|
|
..pushTransform(deviceTransform)
|
|
..addPicture(ui.Offset.zero, picture)
|
|
..pop();
|
|
return sceneBuilder.build();
|
|
}
|
|
|
|
void beginFrame(Duration timeStamp) {
|
|
ui.Rect paintBounds = ui.Point.origin & ui.window.size;
|
|
ui.Picture picture = paint(paintBounds);
|
|
ui.Scene scene = composite(picture, paintBounds);
|
|
ui.window.render(scene);
|
|
}
|
|
|
|
void handlePopRoute() {
|
|
print('Pressed back button.');
|
|
}
|
|
|
|
void handlePointerPacket(ByteData serializedPacket) {
|
|
bindings.Message message = new bindings.Message(serializedPacket, <core.MojoHandle>[], serializedPacket.lengthInBytes, 0);
|
|
PointerPacket packet = PointerPacket.deserialize(message);
|
|
|
|
for (Pointer pointer in packet.pointers) {
|
|
if (pointer.type == PointerType.down) {
|
|
color = new ui.Color.fromARGB(255, 0, 0, 255);
|
|
ui.window.scheduleFrame();
|
|
} else if (pointer.type == PointerType.up) {
|
|
color = new ui.Color.fromARGB(255, 0, 255, 0);
|
|
ui.window.scheduleFrame();
|
|
}
|
|
}
|
|
}
|
|
|
|
void main() {
|
|
print('Hello, world');
|
|
color = new ui.Color.fromARGB(255, 0, 255, 0);
|
|
ui.window.onBeginFrame = beginFrame;
|
|
ui.window.onPopRoute = handlePopRoute;
|
|
ui.window.onPointerPacket = handlePointerPacket;
|
|
ui.window.scheduleFrame();
|
|
}
|