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Issue 34453003: Rename mdv -> template_binding, remove experiemntal apis from dart:html (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 7 years, 2 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 // TODO(jmesserly): more commentary here.
6 /**
7 * Template and node binding for HTML elements.
8 *
9 * This library provides access to the Polymer project's
10 * [Template Binding](http://www.polymer-project.org/platform/template.html) and
11 * [Node.bind()](http://www.polymer-project.org/platform/node_bind.html) APIs.
12 * Find more information at the
13 * [Polymer.dart homepage](https://www.dartlang.org/polymer-dart/).
14 */
15 library mdv;
16
17 import 'dart:async';
18 import 'dart:collection';
19 import 'dart:html';
20 import 'package:observe/observe.dart';
21
22 import 'src/list_diff.dart' show calculateSplices, ListChangeDelta;
23
24 part 'src/element.dart';
25 part 'src/input_bindings.dart';
26 part 'src/input_element.dart';
27 part 'src/node.dart';
28 part 'src/select_element.dart';
29 part 'src/template.dart';
30 part 'src/template_iterator.dart';
31 part 'src/text.dart';
32 part 'src/text_area_element.dart';
33
34 /** Initialize the Model-Driven Views polyfill. */
35 void initialize() {
36 TemplateElement.mdvPackage = _mdv;
37 }
38
39
40 typedef DocumentFragmentCreated(DocumentFragment fragment);
41
42 // TODO(jmesserly): ideally this would be a stream, but they don't allow
43 // reentrancy.
44 Set<DocumentFragmentCreated> _instanceCreated;
45
46 /**
47 * *Warning*: This is an implementation helper for Model-Driven Views and
48 * should not be used in your code.
49 *
50 * This event is fired whenever a template is instantiated via
51 * [Element.createInstance].
52 */
53 // TODO(rafaelw): This is a hack, and is neccesary for the polyfill
54 // because custom elements are not upgraded during clone()
55 // TODO(jmesserly): polymer removed this in:
56 // https://github.com/Polymer/platform/commit/344ffeaae475babb529403f6608588a0fc 73f4e7
57 Set<DocumentFragmentCreated> get instanceCreated {
58 if (_instanceCreated == null) {
59 _instanceCreated = new Set<DocumentFragmentCreated>();
60 }
61 return _instanceCreated;
62 }
63
64
65 // TODO(jmesserly): investigate if expandos give us enough performance.
66
67 // The expando for storing our MDV wrappers.
68 //
69 // In general, we need state associated with the nodes. Rather than having a
70 // bunch of individual expandos, we keep one per node.
71 //
72 // Aside from the potentially helping performance, it also keeps things simpler
73 // if we decide to integrate MDV into the DOM later, and means less code needs
74 // to worry about expandos.
75 final Expando _mdvExpando = new Expando('mdv');
76
77 _mdv(node) {
78 var wrapper = _mdvExpando[node];
79 if (wrapper != null) return wrapper;
80
81 if (node is InputElement) {
82 wrapper = new _InputElementExtension(node);
83 } else if (node is SelectElement) {
84 wrapper = new _SelectElementExtension(node);
85 } else if (node is TextAreaElement) {
86 wrapper = new _TextAreaElementExtension(node);
87 } else if (node is Element) {
88 if (node.isTemplate) {
89 wrapper = new _TemplateExtension(node);
90 } else {
91 wrapper = new _ElementExtension(node);
92 }
93 } else if (node is Text) {
94 wrapper = new _TextExtension(node);
95 } else if (node is Node) {
96 wrapper = new _NodeExtension(node);
97 } else {
98 // TODO(jmesserly): this happens for things like CompoundBinding.
99 wrapper = node;
100 }
101
102 _mdvExpando[node] = wrapper;
103 return wrapper;
104 }
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