Separate out the raw (directly manipulating sky.view) examples from the rendering (using RenderObje…

sky/examples/raw/touch_demo.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:math';
-import 'dart:sky';
-import 'package:sky/framework/app.dart';
-import 'package:sky/framework/rendering/box.dart';
-import 'package:sky/framework/rendering/object.dart';
-
-// Material design colors. :p
-List<int> colors = [
-  0xFF009688,
-  0xFFFFC107,
-  0xFF9C27B0,
-  0xFF03A9F4,
-  0xFF673AB7,
-  0xFFCDDC39,
-];
-
-class Dot {
-  final Paint _paint;
-  double x = 0.0;
-  double y = 0.0;
-  double radius = 0.0;
-
-  Dot({int color}) : _paint = new Paint()..color = color;
-
-  void update(PointerEvent event) {
-    x = event.x;
-    y = event.y;
-    radius = 5 + (95 * event.pressure);
-  }
-
-  void paint(RenderObjectDisplayList canvas) {
-    canvas.drawCircle(x, y, radius, _paint);
-  }
-}
-
-class RenderTouchDemo extends RenderBox {
-  Map<int, Dot> dots = new Map();
-
-  RenderTouchDemo();
-
-  void handleEvent(Event event, BoxHitTestEntry entry) {
-    switch (event.type) {
-      case 'pointerdown':
-        int color = colors[event.pointer.remainder(colors.length)];
-        dots[event.pointer] = new Dot(color: color)..update(event);
-        break;
-      case 'pointerup':
-        dots.remove(event.pointer);
-        break;
-      case 'pointercancel':
-        dots = new Map();
-        break;
-      case 'pointermove':
-        dots[event.pointer].update(event);
-        break;
-    }
-    markNeedsPaint();
-  }
-
-  void performLayout() {
-    size = constraints.constrain(Size.infinite);
-  }
-
-  void paint(RenderObjectDisplayList canvas) {
-    dots.forEach((_, Dot dot) {
-      dot.paint(canvas);
-    });
-  }
-}
-
-AppView app;
-
-void main() {
-  app = new AppView(new RenderTouchDemo());
-}