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449f4a6673
* Update project.pbxproj files to say Flutter rather than Chromium Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright. * Update the copyright notice checker to require a standard notice on all files * Update copyrights on Dart files. (This was a mechanical commit.) * Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine. Some were already marked "The Flutter Authors", not clear why. Their dates have been normalized. Some were missing the blank line after the license. Some were randomly different in trivial ways for no apparent reason (e.g. missing the trailing period). * Clean up the copyrights in non-Dart files. (Manual edits.) Also, make sure templates don't have copyrights. * Fix some more ORGANIZATIONNAMEs
60 lines
1.7 KiB
Dart
60 lines
1.7 KiB
Dart
// Copyright 2014 The Flutter 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 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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class RenderDots extends RenderConstrainedBox {
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RenderDots() : super(additionalConstraints: const BoxConstraints.expand());
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// Makes this render box hittable so that we'll get pointer events.
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@override
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bool hitTestSelf(Offset position) => true;
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final Map<int, Offset> _dots = <int, Offset>{};
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@override
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void handleEvent(PointerEvent event, BoxHitTestEntry entry) {
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if (event is PointerDownEvent || event is PointerMoveEvent) {
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_dots[event.pointer] = event.position;
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markNeedsPaint();
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} else if (event is PointerUpEvent || event is PointerCancelEvent) {
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_dots.remove(event.pointer);
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markNeedsPaint();
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}
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}
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@override
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void paint(PaintingContext context, Offset offset) {
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final Canvas canvas = context.canvas;
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canvas.drawRect(offset & size, Paint()..color = const Color(0xFF0000FF));
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final Paint paint = Paint()..color = const Color(0xFF00FF00);
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for (Offset point in _dots.values)
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canvas.drawCircle(point, 50.0, paint);
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super.paint(context, offset);
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}
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}
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class Dots extends SingleChildRenderObjectWidget {
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const Dots({ Key key, Widget child }) : super(key: key, child: child);
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@override
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RenderDots createRenderObject(BuildContext context) => RenderDots();
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}
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void main() {
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runApp(
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const Directionality(
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textDirection: TextDirection.ltr,
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child: Dots(
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child: Center(
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child: Text('Touch me!'),
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),
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),
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),
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);
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}
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