Srujan Gaddam
3776313e65
Introduces NULLASSERT token and NNBD condition to allow code to conditionally compile with NNBD. Change-Id: Ib71e439f32c793e69b66c328cd7c9900358d886e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134045 Commit-Queue: Srujan Gaddam <srujzs@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
86 lines
2.9 KiB
Plaintext
86 lines
2.9 KiB
Plaintext
// Copyright (c) 2012, 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 $LIBRARYNAME;
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$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
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$!MEMBERS
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/**
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* Checks to see if the mutation observer API is supported on the current
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* platform.
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*/
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static bool get supported {
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return JS('bool',
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'!!(window.MutationObserver || window.WebKitMutationObserver)');
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}
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/**
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* Observes the target for the specified changes.
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*
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* Some requirements for the optional parameters:
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*
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* * Either childList, attributes or characterData must be true.
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* * If attributeOldValue is true then attributes must also be true.
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* * If attributeFilter is specified then attributes must be true.
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* * If characterDataOldValue is true then characterData must be true.
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*/
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void observe(Node target,
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{bool$NULLABLE childList,
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bool$NULLABLE attributes,
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bool$NULLABLE characterData,
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bool$NULLABLE subtree,
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bool$NULLABLE attributeOldValue,
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bool$NULLABLE characterDataOldValue,
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List<String>$NULLABLE attributeFilter}) {
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// Parse options into map of known type.
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var parsedOptions = _createDict();
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// Override options passed in the map with named optional arguments.
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override(key, value) {
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if (value != null) _add(parsedOptions, key, value);
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}
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override('childList', childList);
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override('attributes', attributes);
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override('characterData', characterData);
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override('subtree', subtree);
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override('attributeOldValue', attributeOldValue);
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override('characterDataOldValue', characterDataOldValue);
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if (attributeFilter != null) {
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override('attributeFilter', _fixupList(attributeFilter));
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}
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_call(target, parsedOptions);
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}
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// TODO: Change to a set when const Sets are available.
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static final _boolKeys =
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const {'childList': true,
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'attributes': true,
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'characterData': true,
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'subtree': true,
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'attributeOldValue': true,
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'characterDataOldValue': true };
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static _createDict() => JS('var', '{}');
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static _add(m, String key, value) { JS('void', '#[#] = #', m, key, value); }
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static _fixupList(list) => list; // TODO: Ensure is a JavaScript Array.
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// Call native function with no conversions.
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@JSName('observe')
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void _call(target, options) native;
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factory MutationObserver(MutationCallback callback) {
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// Dummy statement to mark types as instantiated.
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JS('MutationObserver|MutationRecord', '0');
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return JS('MutationObserver',
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'new(window.MutationObserver||window.WebKitMutationObserver||'
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'window.MozMutationObserver)(#)',
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convertDartClosureToJS(_wrapBinaryZone(callback), 2));
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}
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}
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