jmesserly@google.com
7b3123e02a
https://github.com/Polymer/TemplateBinding/tree/ed3266266e751b5ab1f75f8e0509d0d5f0ef35d8 R=sigmund@google.com Review URL: https://codereview.chromium.org//50203004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29500 260f80e4-7a28-3924-810f-c04153c831b5
83 lines
2.6 KiB
Dart
83 lines
2.6 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 template_binding;
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/** Extensions to the [Node] API. */
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class NodeBindExtension {
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final Node _node;
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Map<String, NodeBinding> _bindings;
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NodeBindExtension._(this._node);
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/**
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* Binds the attribute [name] to the [path] of the [model].
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* Path is a String of accessors such as `foo.bar.baz`.
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* Returns the `NodeBinding` instance.
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*/
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NodeBinding bind(String name, model, [String path]) {
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window.console.error('Unhandled binding to Node: '
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'$this $name $model $path');
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}
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/** Unbinds the attribute [name]. */
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void unbind(String name) {
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if (_bindings == null) return;
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var binding = bindings.remove(name);
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if (binding != null) binding.close();
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}
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/** Unbinds all bound attributes. */
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void unbindAll() {
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if (_bindings == null) return;
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for (var binding in bindings.values.toList()) {
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if (binding != null) binding.close();
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}
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_bindings = null;
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}
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// TODO(jmesserly): we should return a read-only wrapper here.
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/** Gets the data bindings that are associated with this node. */
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Map<String, NodeBinding> get bindings {
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if (_bindings == null) _bindings = new LinkedHashMap<String, NodeBinding>();
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return _bindings;
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}
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/**
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* Dispatch support so custom HtmlElement's can override these methods.
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* A public method like [this.bind] should not call another public method such
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* as [this.unbind]. Instead it should dispatch through [_self.unbind].
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*/
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NodeBindExtension get _self => _node is NodeBindExtension ? _node : this;
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TemplateInstance _templateInstance;
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/** Gets the template instance that instantiated this node, if any. */
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TemplateInstance get templateInstance =>
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_templateInstance != null ? _templateInstance :
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(_node.parent != null ? nodeBind(_node.parent).templateInstance : null);
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}
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/** Information about the instantiated template. */
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class TemplateInstance {
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// TODO(rafaelw): firstNode & lastNode should be read-synchronous
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// in cases where script has modified the template instance boundary.
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/** The first node of this template instantiation. */
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final Node firstNode;
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/**
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* The last node of this template instantiation.
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* This could be identical to [firstNode] if the template only expanded to a
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* single node.
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*/
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final Node lastNode;
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/** The model used to instantiate the template. */
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final model;
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TemplateInstance(this.firstNode, this.lastNode, this.model);
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}
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