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Issue 1162963002: Revert "Rename polymer and cr_elements v0_8 to v1_0" (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 6 months ago
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1
2 /**
3 * `IronResizableBehavior` is a behavior that can be used in Polymer elements to
4 * coordinate the flow of resize events between "resizers" (elements that cont rol the
5 * size or hidden state of their children) and "resizables" (elements that nee d to be
6 * notified when they are resized or un-hidden by their parents in order to ta ke
7 * action on their new measurements).
8 * Elements that perform measurement should add the `IronResizableBehavior` be havior to
9 * their element definition and listen for the `iron-resize` event on themselv es.
10 * This event will be fired when they become showing after having been hidden,
11 * when they are resized explicitly by another resizable, or when the window h as been
12 * resized.
13 * Note, the `iron-resize` event is non-bubbling.
14 *
15 * @polymerBehavior Polymer.IronResizableBehavior
16 * @demo demo/index.html
17 **/
18 Polymer.IronResizableBehavior = {
19 properties: {
20 _parentResizable: {
21 type: Object,
22 observer: '_parentResizableChanged'
23 }
24 },
25
26 listeners: {
27 'iron-request-resize-notifications': '_onIronRequestResizeNotifications'
28 },
29
30 created: function() {
31 // We don't really need property effects on these, and also we want them
32 // to be created before the `_parentResizable` observer fires:
33 this._interestedResizables = [];
34 this._boundNotifyResize = this.notifyResize.bind(this);
35 },
36
37 attached: function() {
38 this.fire('iron-request-resize-notifications', null, {
39 node: this,
40 bubbles: true
41 });
42
43 if (!this._parentResizable) {
44 window.addEventListener('resize', this._boundNotifyResize);
45 this.notifyResize();
46 }
47 },
48
49 detached: function() {
50 if (this._parentResizable) {
51 this._parentResizable.stopResizeNotificationsFor(this);
52 } else {
53 window.removeEventListener('resize', this._boundNotifyResize);
54 }
55
56 this._parentResizable = null;
57 },
58
59 /**
60 * Can be called to manually notify a resizable and its descendant
61 * resizables of a resize change.
62 */
63 notifyResize: function() {
64 if (!this.isAttached) {
65 return;
66 }
67
68 this._interestedResizables.forEach(function(resizable) {
69 // TODO(cdata): Currently behaviors cannot define "abstract" methods..
70 if (!this.resizerShouldNotify || this.resizerShouldNotify(resizable)) {
71 resizable.notifyResize();
72 }
73 }, this);
74
75 this.fire('iron-resize', null, {
76 node: this,
77 bubbles: false
78 });
79 },
80
81 /**
82 * Used to assign the closest resizable ancestor to this resizable
83 * if the ancestor detects a request for notifications.
84 */
85 assignParentResizable: function(parentResizable) {
86 this._parentResizable = parentResizable;
87 },
88
89 /**
90 * Used to remove a resizable descendant from the list of descendants
91 * that should be notified of a resize change.
92 */
93 stopResizeNotificationsFor: function(target) {
94 var index = this._interestedResizables.indexOf(target);
95
96 if (index > -1) {
97 this._interestedResizables.splice(index, 1);
98 }
99 },
100
101 // TODO(cdata): Currently behaviors cannot define "abstract" methods.
102 // resizerShouldNotify: function(el) { return true; },
103
104 _parentResizableChanged: function(parentResizable) {
105 if (parentResizable) {
106 window.removeEventListener('resize', this._boundNotifyResize);
107 }
108 },
109
110 _onIronRequestResizeNotifications: function(event) {
111 var target = event.path ? event.path[0] : event.target;
112
113 if (target === this) {
114 return;
115 }
116
117 if (this._interestedResizables.indexOf(target) === -1) {
118 this._interestedResizables.push(target);
119 }
120
121 target.assignParentResizable(this);
122
123 event.stopPropagation();
124 }
125 };
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