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Side by Side Diff: dart/pkg/template_binding/lib/src/node.dart

Issue 336013003: Version 1.5.0-dev.4.14 (Closed) Base URL: http://dart.googlecode.com/svn/trunk/
Patch Set: Created 6 years, 6 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 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 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. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 part of template_binding; 5 part of template_binding;
6 6
7 /** Extensions to the [Node] API. */ 7 /** Extensions to the [Node] API. */
8 class NodeBindExtension { 8 class NodeBindExtension {
9 final Node _node; 9 final Node _node;
10 Map<String, Bindable> _bindings; 10
11 /**
12 * Gets the data bindings that are associated with this node, if any.
13 *
14 * This starts out null, and if [enableBindingsReflection] is enabled, calls
15 * to [bind] will initialize this field and the binding.
16 */
17 // Dart note: in JS this has a trailing underscore, meaning "private".
18 // But in dart if we made it _bindings, it wouldn't be accessible at all.
19 // It is unfortunately needed to implement Node.bind correctly.
20 Map<String, Bindable> bindings;
11 21
12 NodeBindExtension._(this._node); 22 NodeBindExtension._(this._node);
13 23
14 /** 24 /**
15 * Binds the attribute [name] to the [path] of the [model]. 25 * Binds the attribute [name] to the [path] of the [model].
16 * Path is a String of accessors such as `foo.bar.baz`. 26 * Path is a String of accessors such as `foo.bar.baz`.
17 * Returns the `Bindable` instance. 27 * Returns the [Bindable] instance.
18 */ 28 */
19 Bindable bind(String name, value, {bool oneTime: false}) { 29 Bindable bind(String name, value, {bool oneTime: false}) {
20 // TODO(jmesserly): in Dart we could deliver an async error, which would 30 // TODO(jmesserly): in Dart we could deliver an async error, which would
21 // have a similar affect but be reported as a test failure. Should we? 31 // have a similar affect but be reported as a test failure. Should we?
22 window.console.error('Unhandled binding to Node: ' 32 window.console.error('Unhandled binding to Node: '
23 '$this $name $value $oneTime'); 33 '$this $name $value $oneTime');
24 return null; 34 return null;
25 } 35 }
26 36
27 /** Unbinds the attribute [name]. */ 37 /**
28 void unbind(String name) { 38 * Called when all [bind] calls are finished for a given template expansion.
29 if (_bindings == null) return; 39 */
30 var binding = bindings.remove(name); 40 void bindFinished() {}
31 if (binding != null) binding.close();
32 }
33
34 /** Unbinds all bound attributes. */
35 void unbindAll() {
36 if (_bindings == null) return;
37 for (var binding in bindings.values.toList()) {
38 if (binding != null) binding.close();
39 }
40 _bindings = null;
41 }
42
43 // TODO(jmesserly): we should return a read-only wrapper here.
44 /** Gets the data bindings that are associated with this node. */
45 Map<String, Bindable> get bindings {
46 if (_bindings == null) _bindings = new LinkedHashMap<String, Bindable>();
47 return _bindings;
48 }
49 41
50 /** 42 /**
51 * Dispatch support so custom HtmlElement's can override these methods. 43 * Dispatch support so custom HtmlElement's can override these methods.
52 * A public method like [this.bind] should not call another public method such 44 *
53 * as [this.unbind]. Instead it should dispatch through [_self.unbind]. 45 * A public method like [this.bind] should not call another public method.
46 *
47 * Instead it should dispatch through [_self] to give the "overridden" method
48 * a chance to intercept.
54 */ 49 */
55 NodeBindExtension get _self => _node is NodeBindExtension ? _node : this; 50 NodeBindExtension get _self => _node is NodeBindExtension ? _node : this;
56 51
57 TemplateInstance _templateInstance; 52 TemplateInstance _templateInstance;
58 53
59 /** Gets the template instance that instantiated this node, if any. */ 54 /** Gets the template instance that instantiated this node, if any. */
60 TemplateInstance get templateInstance => 55 TemplateInstance get templateInstance =>
61 _templateInstance != null ? _templateInstance : 56 _templateInstance != null ? _templateInstance :
62 (_node.parent != null ? nodeBind(_node.parent).templateInstance : null); 57 (_node.parent != null ? nodeBind(_node.parent).templateInstance : null);
63 58
64 _open(Bindable bindable, callback(value)) => 59 _open(Bindable bindable, callback(value)) =>
65 callback(bindable.open(callback)); 60 callback(bindable.open(callback));
61
62 Bindable _maybeUpdateBindings(String name, Bindable binding) {
63 return enableBindingsReflection ? _updateBindings(name, binding) : binding;
64 }
65
66 Bindable _updateBindings(String name, Bindable binding) {
67 if (bindings == null) bindings = {};
68 var old = bindings[name];
69 if (old != null) old.close();
70 return bindings[name] = binding;
71 }
66 } 72 }
67 73
68 74
69 /** Information about the instantiated template. */ 75 /** Information about the instantiated template. */
70 class TemplateInstance { 76 class TemplateInstance {
71 // TODO(rafaelw): firstNode & lastNode should be read-synchronous 77 // TODO(rafaelw): firstNode & lastNode should be read-synchronous
72 // in cases where script has modified the template instance boundary. 78 // in cases where script has modified the template instance boundary.
73 79
74 /** The first node of this template instantiation. */ 80 /** The first node of this template instantiation. */
75 Node get firstNode => _firstNode; 81 Node get firstNode => _firstNode;
76 82
77 /** 83 /**
78 * The last node of this template instantiation. 84 * The last node of this template instantiation.
79 * This could be identical to [firstNode] if the template only expanded to a 85 * This could be identical to [firstNode] if the template only expanded to a
80 * single node. 86 * single node.
81 */ 87 */
82 Node get lastNode => _lastNode; 88 Node get lastNode => _lastNode;
83 89
84 /** The model used to instantiate the template. */ 90 /** The model used to instantiate the template. */
85 final model; 91 final model;
86 92
87 Node _firstNode, _lastNode; 93 Node _firstNode, _lastNode;
88 94
89 TemplateInstance(this.model); 95 TemplateInstance(this.model);
90 } 96 }
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