1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
var Event = require('event_bindings').Event;
var AutomationNode = require('automationNode').AutomationNode;
var utils = require('utils');
// Maps an attribute to its default value in an invalidated node.
// These attributes are taken directly from the Automation idl.
var AutomationAttributeDefaults = {
'id': -1,
'role': '',
'state': {},
'location': { left: 0, top: 0, width: 0, height: 0 }
};
var AutomationAttributeTypes = [
'boolAttributes',
'floatAttributes',
'htmlAttributes',
'intAttributes',
'intlistAttributes',
'stringAttributes'
];
/**
* AutomationTree.
*
* An AutomationTree is the javascript end of an AXTree living in the browser.
* AutomationTree handles unserializing incremental updates from the source
* AXTree. Each update contains node data that form a complete tree after
* applying the update.
*
* A brief note about ids used through this class. The source AXTree assigns
* unique ids per node and we use these ids to build a hash to the actual
* AutomationNode object.
* Thus, tree traversals amount to a lookup in our hash.
*
* The tree itself is identified by the process id and routing id of the
* renderer widget host.
* @constructor
*/
var AutomationTreeImpl = function(processID, routingID) {
this.processID = processID;
this.routingID = routingID;
this.listeners = {};
this.root = new AutomationNode(this);
this.axNodeDataCache_ = {};
};
AutomationTreeImpl.prototype = {
root: null,
get: function(id) {
return this.axNodeDataCache_[id];
},
invalidate: function(node) {
if (!node)
return;
var children = node.children();
for (var i = 0, child; child = children[i]; i++)
this.invalidate(child);
var id = node.id;
for (var key in AutomationAttributeDefaults) {
privates(node).impl[key] = AutomationAttributeDefaults[key];
}
privates(node).impl.loaded = false;
privates(node).impl.id = id;
this.axNodeDataCache_[id] = undefined;
},
// TODO(aboxhall): make AutomationTree inherit from AutomationNode (or a
// mutual ancestor) and remove this code.
addEventListener: function(eventType, callback, capture) {
this.removeEventListener(eventType, callback);
if (!this.listeners[eventType])
this.listeners[eventType] = [];
this.listeners[eventType].push({callback: callback, capture: capture});
},
removeEventListener: function(eventType, callback) {
if (this.listeners[eventType]) {
var listeners = this.listeners[eventType];
for (var i = 0; i < listeners.length; i++) {
if (callback === listeners[i].callback)
listeners.splice(i, 1);
}
}
},
update: function(data) {
var didUpdateRoot = false;
if (data.nodes.length == 0)
return false;
for (var i = 0; i < data.nodes.length; i++) {
var nodeData = data.nodes[i];
var node = this.axNodeDataCache_[nodeData.id];
if (!node) {
node = new AutomationNode(this);
}
// Update children.
var oldChildIDs = privates(node).impl.childIds;
var newChildIDs = nodeData.childIds || [];
var newChildIDsHash = {};
for (var j = 0, newId; newId = newChildIDs[j]; j++) {
// Hash the new child ids for faster lookup.
newChildIDsHash[newId] = newId;
// We need to update all new children's parent id regardless.
var childNode = this.get(newId);
if (!childNode) {
childNode = new AutomationNode(this);
this.axNodeDataCache_[newId] = childNode;
privates(childNode).impl.id = newId;
}
privates(childNode).impl.indexInParent = j;
privates(childNode).impl.parentID = nodeData.id;
}
for (var k = 0, oldId; oldId = oldChildIDs[k]; k++) {
// However, we must invalidate all old child ids that are no longer
// children.
if (!newChildIDsHash[oldId]) {
this.invalidate(this.get(oldId));
}
}
if (nodeData.role == 'rootWebArea' || nodeData.role == 'desktop') {
this.root = node;
didUpdateRoot = true;
}
for (var key in AutomationAttributeDefaults) {
if (key in nodeData)
privates(node).impl[key] = nodeData[key];
else
privates(node).impl[key] = AutomationAttributeDefaults[key];
}
for (var attributeTypeIndex = 0;
attributeTypeIndex < AutomationAttributeTypes.length;
attributeTypeIndex++) {
var attributeType = AutomationAttributeTypes[attributeTypeIndex];
for (var attributeID in nodeData[attributeType]) {
privates(node).impl.attributes[attributeID] =
nodeData[attributeType][attributeID];
}
}
privates(node).impl.childIds = newChildIDs;
privates(node).impl.loaded = true;
this.axNodeDataCache_[node.id] = node;
}
var node = this.get(data.targetID);
if (node)
privates(node).impl.dispatchEvent(data.eventType);
return true;
},
toString: function() {
function toStringInternal(node, indent) {
if (!node)
return '';
var output =
new Array(indent).join(' ') + privates(node).impl.toString() + '\n';
indent += 2;
for (var i = 0; i < node.children().length; i++)
output += toStringInternal(node.children()[i], indent);
return output;
}
return toStringInternal(this.root, 0);
}
};
exports.AutomationTree = utils.expose('AutomationTree',
AutomationTreeImpl,
{ functions: ['addEventListener',
'removeEventListener'],
readonly: ['root'] });
|
