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74575775bd
This fixes some theoretical bugs whereby we were using hashCode to try
to get unique keys for objects, but really we wanted object identity.
It also lays the groundwork for a new GlobalKey concept.
I tried to keep the impact on the code minimal, which is why the "Key"
constructor is actually a factory that returns a StringKey. The code
has this class hierarchy:
```
KeyBase
|
Key--------------+---------------+
| | |
StringKey ObjectKey UniqueKey
```
...where the constructors are Key and Key.stringify (StringKey),
Key.fromObjectIdentity (ObjectKey), and Key.unique (UniqueKey).
We could instead of factory methods use regular constructors with the
following hierarchy:
```
KeyBase
|
LocalKey---------+---------------+
| | |
Key ObjectIdentityKey UniqueKey
```
...with constructors Key, Key.stringify, ObjectIdentityKey, and
UniqueKey, but I felt that that was maybe a more confusing hierarchy.
I don't have a strong opinion on this.
56 lines
1.5 KiB
Dart
56 lines
1.5 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:sky/widgets/basic.dart';
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import 'package:sky/widgets/button_base.dart';
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import 'package:sky/widgets/ink_well.dart';
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import 'package:sky/widgets/material.dart';
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// Rather than using this class directly, please use FlatButton or RaisedButton.
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abstract class MaterialButton extends ButtonBase {
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MaterialButton({
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Key key,
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this.child,
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this.enabled: true,
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this.onPressed
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}) : super(key: key);
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Widget child;
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bool enabled;
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Function onPressed;
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void syncFields(MaterialButton source) {
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child = source.child;
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enabled = source.enabled;
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onPressed = source.onPressed;
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super.syncFields(source);
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}
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Color get color;
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int get level;
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Widget buildContent() {
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Widget contents = new Container(
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padding: new EdgeDims.symmetric(horizontal: 8.0),
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child: new Center(child: child) // TODO(ianh): figure out a way to compell the child to have gray text when disabled...
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);
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return new Listener(
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child: new Container(
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height: 36.0,
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constraints: new BoxConstraints(minWidth: 88.0),
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margin: new EdgeDims.all(8.0),
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child: new Material(
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type: MaterialType.button,
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child: enabled ? new InkWell(child: contents) : contents,
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level: level,
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color: color
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)
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),
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onGestureTap: (_) { if (onPressed != null && enabled) onPressed(); }
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);
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}
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}
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