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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
62 lines
2.2 KiB
Dart
62 lines
2.2 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/foundation.dart';
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import 'framework.dart';
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import 'scroll_controller.dart';
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/// Associates a [ScrollController] with a subtree.
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///
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/// When a [ScrollView] has [ScrollView.primary] set to true and is not given
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/// an explicit [ScrollController], the [ScrollView] uses [of] to find the
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/// [ScrollController] associated with its subtree.
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///
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/// This mechanism can be used to provide default behavior for scroll views in a
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/// subtree. For example, the [Scaffold] uses this mechanism to implement the
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/// scroll-to-top gesture on iOS.
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class PrimaryScrollController extends InheritedWidget {
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/// Creates a widget that associates a [ScrollController] with a subtree.
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const PrimaryScrollController({
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Key key,
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@required this.controller,
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@required Widget child,
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}) : assert(controller != null),
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super(key: key, child: child);
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/// Creates a subtree without an associated [ScrollController].
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const PrimaryScrollController.none({
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Key key,
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@required Widget child,
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}) : controller = null,
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super(key: key, child: child);
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/// The [ScrollController] associated with the subtree.
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///
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/// See also:
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///
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/// * [ScrollView.controller], which discusses the purpose of specifying a
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/// scroll controller.
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final ScrollController controller;
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/// Returns the [ScrollController] most closely associated with the given
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/// context.
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///
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/// Returns null if there is no [ScrollController] associated with the given
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/// context.
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static ScrollController of(BuildContext context) {
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final PrimaryScrollController result = context.dependOnInheritedWidgetOfExactType<PrimaryScrollController>();
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return result?.controller;
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}
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@override
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bool updateShouldNotify(PrimaryScrollController oldWidget) => controller != oldWidget.controller;
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@override
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void debugFillProperties(DiagnosticPropertiesBuilder properties) {
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super.debugFillProperties(properties);
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properties.add(DiagnosticsProperty<ScrollController>('controller', controller, ifNull: 'no controller', showName: false));
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}
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}
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