948ae15ca5
Our examples have been growing organically over time. This patch cleans them up to illustrate specific aspects of Flutter.
68 lines
2.2 KiB
Dart
68 lines
2.2 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:ui' as ui;
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import 'dart:typed_data';
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ui.Paragraph paragraph;
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ui.Picture paint(ui.Rect paintBounds) {
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ui.PictureRecorder recorder = new ui.PictureRecorder();
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ui.Canvas canvas = new ui.Canvas(recorder, paintBounds);
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canvas.translate(ui.window.size.width / 2.0, ui.window.size.height / 2.0);
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canvas.drawRect(new ui.Rect.fromLTRB(-100.0, -100.0, 100.0, 100.0),
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new ui.Paint()..color = const ui.Color.fromARGB(255, 0, 255, 0));
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canvas.translate(paragraph.maxWidth / -2.0, (paragraph.maxWidth / 2.0) - 125);
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paragraph.paint(canvas, ui.Offset.zero);
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return recorder.endRecording();
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}
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ui.Scene composite(ui.Picture picture, ui.Rect paintBounds) {
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final double devicePixelRatio = ui.window.devicePixelRatio;
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ui.Rect sceneBounds = new ui.Rect.fromLTWH(
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0.0,
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0.0,
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ui.window.size.width * devicePixelRatio,
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ui.window.size.height * devicePixelRatio
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);
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Float64List deviceTransform = new Float64List(16)
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..[0] = devicePixelRatio
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..[5] = devicePixelRatio
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..[10] = 1.0
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..[15] = 1.0;
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ui.SceneBuilder sceneBuilder = new ui.SceneBuilder(sceneBounds)
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..pushTransform(deviceTransform)
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..addPicture(ui.Offset.zero, picture)
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..pop();
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return sceneBuilder.build();
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}
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void beginFrame(Duration timeStamp) {
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ui.Rect paintBounds = ui.Point.origin & ui.window.size;
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ui.Picture picture = paint(paintBounds);
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ui.Scene scene = composite(picture, paintBounds);
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ui.window.render(scene);
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}
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void main() {
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ui.ParagraphBuilder builder = new ui.ParagraphBuilder()
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..pushStyle(new ui.TextStyle(color: const ui.Color(0xFF0000FF)))
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..addText("Hello, ")
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..pushStyle(new ui.TextStyle(fontWeight: ui.FontWeight.bold))
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..addText("world. ")
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..pop()
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..addText("هذا هو قليلا طويلة من النص الذي يجب التفاف .")
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..pop()
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..addText(" و أكثر قليلا لجعله أطول. ");
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paragraph = builder.build(new ui.ParagraphStyle())
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..maxWidth = 180.0
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..layout();
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ui.window.onBeginFrame = beginFrame;
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ui.window.scheduleFrame();
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}
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