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003083a12d
This also removes one bit of magic to make it more obvious what on is going on during a sync, which should hopefully help. Components have to decide if they support being stateful or not. If they do, then they must implement syncFields() and have mutable fields; if they don't, then they must have final fields. This isn't particularly enforced, though. This also renames _willSync() to _retainStatefulNodeIfPossible(), for clarity, and fixes some minor style issues and one typo that was breaking the drawer. R=abarth@chromium.org Review URL: https://codereview.chromium.org/1174023003
45 lines
900 B
Dart
45 lines
900 B
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 '../fn2.dart';
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abstract class ButtonBase extends Component {
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ButtonBase({ Object key, this.highlight: false }) : super(key: key);
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bool highlight;
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void syncFields(ButtonBase source) {
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highlight = source.highlight;
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}
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void _handlePointerDown(_) {
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setState(() {
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highlight = true;
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});
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}
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void _handlePointerUp(_) {
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setState(() {
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highlight = false;
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});
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}
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void _handlePointerCancel(_) {
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setState(() {
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highlight = false;
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});
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}
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UINode build() {
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return new EventListenerNode(
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buildContent(),
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onPointerDown: _handlePointerDown,
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onPointerUp: _handlePointerUp,
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onPointerCancel: _handlePointerCancel
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);
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}
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UINode buildContent();
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}
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