Srujan Gaddam
bc65eafd3b
There are several instances where there are non-nullable variables with null checks associated with them that should be converted back to nullable. Attribute functions in Element are clarified as well. Change-Id: I23cf020f02f3d4b512e041f0339daafb46fdd7f2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/140909 Reviewed-by: Stephen Adams <sra@google.com> Commit-Queue: Srujan Gaddam <srujzs@google.com>
68 lines
2.5 KiB
Dart
68 lines
2.5 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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part of dart.dom.html;
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void Function(T)? _wrapZone<T>(void Function(T)? callback) {
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// For performance reasons avoid wrapping if we are in the root zone.
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if (Zone.current == Zone.root) return callback;
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if (callback == null) return null;
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return Zone.current.bindUnaryCallbackGuarded(callback);
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}
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void Function(T1, T2)? _wrapBinaryZone<T1, T2>(
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void Function(T1, T2)? callback) {
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// For performance reasons avoid wrapping if we are in the root zone.
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if (Zone.current == Zone.root) return callback;
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if (callback == null) return null;
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return Zone.current.bindBinaryCallbackGuarded(callback);
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}
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/**
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* Finds the first descendant element of this document that matches the
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* specified group of selectors.
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*
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* Unless your webpage contains multiple documents, the top-level
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* [querySelector]
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* method behaves the same as this method, so you should use it instead to
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* save typing a few characters.
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*
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* [selectors] should be a string using CSS selector syntax.
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*
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* var element1 = document.querySelector('.className');
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* var element2 = document.querySelector('#id');
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*
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* For details about CSS selector syntax, see the
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* [CSS selector specification](http://www.w3.org/TR/css3-selectors/).
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*/
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Element? querySelector(String selectors) => document.querySelector(selectors);
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/**
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* Finds all descendant elements of this document that match the specified
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* group of selectors.
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*
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* Unless your webpage contains multiple documents, the top-level
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* [querySelectorAll]
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* method behaves the same as this method, so you should use it instead to
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* save typing a few characters.
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*
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* [selectors] should be a string using CSS selector syntax.
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*
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* var items = document.querySelectorAll('.itemClassName');
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*
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* For details about CSS selector syntax, see the
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* [CSS selector specification](http://www.w3.org/TR/css3-selectors/).
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*/
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ElementList<T> querySelectorAll<T extends Element>(String selectors) =>
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document.querySelectorAll(selectors);
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/// A utility for changing the Dart wrapper type for elements.
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abstract class ElementUpgrader {
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/// Upgrade the specified element to be of the Dart type this was created for.
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///
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/// After upgrading the element passed in is invalid and the returned value
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/// should be used instead.
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Element upgrade(Element element);
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}
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