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c09aac3f3f
- makes the event logic not involve a boolean return value (since we ignored it anyway) - splits the event handling logic into two steps, hit testing and event dispatch - introduces an App class on the Dart side to factor out the interaction with the C++ side - ports sector-layout and simple_render_tree to the new App infrastructure - port simple_render_tree to the new event handling logic - implement hit testing for the sector-layout demo R=eseidel@chromium.org Review URL: https://codereview.chromium.org/1143343004
75 lines
1.6 KiB
Dart
75 lines
1.6 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:math';
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import 'dart:sky';
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import 'package:sky/framework/app.dart';
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import 'package:sky/framework/layout2.dart';
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// Material design colors. :p
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List<int> colors = [
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0xFF009688,
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0xFFFFC107,
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0xFF9C27B0,
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0xFF03A9F4,
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0xFF673AB7,
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0xFFCDDC39,
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];
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class Dot {
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final Paint _paint;
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double x = 0.0;
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double y = 0.0;
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double radius = 0.0;
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Dot({int color}) : _paint = new Paint()..color = color;
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void update(PointerEvent event) {
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x = event.x;
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y = event.y;
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radius = 5 + (95 * event.pressure);
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}
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void paint(RenderNodeDisplayList canvas) {
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canvas.drawCircle(x, y, radius, _paint);
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}
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}
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class RenderTouchDemo extends RenderBox {
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Map<int, Dot> dots = new Map();
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RenderTouchDemo();
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void handlePointer(PointerEvent event) {
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switch (event.type) {
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case 'pointerdown':
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int color = colors[event.pointer.remainder(colors.length)];
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dots[event.pointer] = new Dot(color: color)..update(event);
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break;
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case 'pointerup':
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dots.remove(event.pointer);
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break;
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case 'pointercancel':
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dots = new Map();
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break;
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case 'pointermove':
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dots[event.pointer].update(event);
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break;
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}
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markNeedsPaint();
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}
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void paint(RenderNodeDisplayList canvas) {
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dots.forEach((_, Dot dot) {
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dot.paint(canvas);
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});
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}
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}
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AppView app;
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void main() {
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app = new AppView(new RenderTouchDemo());
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}
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