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137 lines
4.1 KiB
Dart
137 lines
4.1 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 'package:flutter/material.dart';
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import 'package:flutter/painting.dart';
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import 'package:flutter/rendering.dart';
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class DragData {
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DragData(this.text);
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final String text;
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}
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class ExampleDragTarget extends StatefulComponent {
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ExampleDragTargetState createState() => new ExampleDragTargetState();
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}
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class ExampleDragTargetState extends State<ExampleDragTarget> {
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String _text = 'Drag Target';
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void _handleAccept(DragData data) {
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setState(() {
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_text = 'dropped: ${data.text}';
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});
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}
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Widget build(BuildContext context) {
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return new DragTarget<DragData>(
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onAccept: _handleAccept,
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builder: (BuildContext context, List<DragData> data, _) {
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return new Container(
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height: 100.0,
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margin: new EdgeDims.all(10.0),
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decoration: new BoxDecoration(
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border: new Border.all(
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width: 3.0,
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color: data.isEmpty ? Colors.white : Colors.blue[500]
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),
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backgroundColor: data.isEmpty ? Colors.grey[500] : Colors.green[500]
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),
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child: new Center(
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child: new Text(_text)
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)
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);
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}
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);
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}
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}
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class Dot extends StatelessComponent {
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Dot({ Key key, this.color, this.size }) : super(key: key);
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final Color color;
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final double size;
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Widget build(BuildContext context) {
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return new Container(
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width: size,
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height: size,
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decoration: new BoxDecoration(
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borderRadius: 10.0,
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backgroundColor: color
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)
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);
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}
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}
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class ExampleDragSource extends StatelessComponent {
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ExampleDragSource({ Key key, this.navigator, this.name, this.color }) : super(key: key);
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final NavigatorState navigator;
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final String name;
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final Color color;
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static const kDotSize = 50.0;
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static const kFingerSize = 50.0;
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Widget build(BuildContext context) {
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return new Draggable(
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navigator: navigator,
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data: new DragData(name),
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child: new Dot(color: color, size: kDotSize),
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feedback: new Transform(
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transform: new Matrix4.identity()..translate(-kDotSize / 2.0, -(kDotSize / 2.0 + kFingerSize)),
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child: new Opacity(
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opacity: 0.75,
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child: new Dot(color: color, size: kDotSize)
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)
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),
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feedbackOffset: const Offset(0.0, -kFingerSize),
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dragAnchor: DragAnchor.pointer
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);
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}
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}
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class DragAndDropApp extends StatefulComponent {
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DragAndDropApp({ this.navigator });
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final NavigatorState navigator;
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DragAndDropAppState createState() => new DragAndDropAppState();
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}
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class DragAndDropAppState extends State<DragAndDropApp> {
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Widget build(BuildContext context) {
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return new Scaffold(
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toolBar: new ToolBar(
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center: new Text('Drag and Drop Flutter Demo')
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),
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body: new DefaultTextStyle(
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style: Theme.of(context).text.body1.copyWith(textAlign: TextAlign.center),
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child: new Column(<Widget>[
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new Flexible(child: new Row(<Widget>[
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new ExampleDragSource(navigator: config.navigator, name: 'Orange', color: const Color(0xFFFF9000)),
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new ExampleDragSource(navigator: config.navigator, name: 'Teal', color: const Color(0xFF00FFFF)),
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new ExampleDragSource(navigator: config.navigator, name: 'Yellow', color: const Color(0xFFFFF000)),
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],
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alignItems: FlexAlignItems.center,
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justifyContent: FlexJustifyContent.spaceAround
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)),
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new Flexible(child: new Row(<Widget>[
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new Flexible(child: new ExampleDragTarget()),
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new Flexible(child: new ExampleDragTarget()),
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new Flexible(child: new ExampleDragTarget()),
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new Flexible(child: new ExampleDragTarget()),
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])),
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])
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)
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);
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}
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}
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void main() {
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runApp(new MaterialApp(
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title: 'Drag and Drop Flutter Demo',
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routes: <String, RouteBuilder>{
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'/': (RouteArguments args) => new DragAndDropApp(navigator: args.navigator)
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}
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));
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}
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