1 files changed, 114 insertions, 0 deletions
diff --git a/chromium/chrome/browser/resources/chromeos/chromevox/host/chrome/braille.js b/chromium/chrome/browser/resources/chromeos/chromevox/host/chrome/braille.js
new file mode 100644
index 00000000000..1b202ade3c2
--- /dev/null
+++ b/chromium/chrome/browser/resources/chromeos/chromevox/host/chrome/braille.js
@@ -0,0 +1,114 @@
+// 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.
+
+/**
+ * @fileoverview Bridge that sends Braille messages from content scripts or
+ * other pages to the main background page.
+ *
+ */
+
+goog.provide('cvox.ChromeBraille');
+
+goog.require('cvox.AbstractBraille');
+goog.require('cvox.BrailleKeyEvent');
+goog.require('cvox.ChromeVoxUserCommands');
+goog.require('cvox.HostFactory');
+
+
+/**
+ * @constructor
+ * @extends {cvox.AbstractBraille}
+ */
+cvox.ChromeBraille = function() {
+  goog.base(this);
+  /**
+   * @type {function(!cvox.BrailleKeyEvent, cvox.NavBraille)}
+   * @private
+   */
+  this.commandListener_ = this.defaultCommandListener_;
+  /**
+   * @type {cvox.NavBraille}
+   * @private
+   */
+  this.lastContent_ = null;
+  /**
+   * @type {string}
+   * @private
+   */
+  this.lastContentId_ = '';
+  /**
+   * @type {number}
+   * @private
+   */
+  this.nextLocalId_ = 1;
+  cvox.ExtensionBridge.addMessageListener(goog.bind(function(msg, port) {
+    // Since ChromeVox gets injected into multiple iframes on a page, check to
+    // ensure that this is the "active" iframe via its focused state.
+    // Furthermore, if the active element is itself an iframe, the focus is
+    // within the iframe even though the containing document also has focus.
+    // Don't process the event if this document isn't focused or focus lies in
+    // a descendant.
+    if (!document.hasFocus() || document.activeElement.tagName == 'IFRAME') {
+      return;
+    }
+    if (msg['message'] == 'BRAILLE' && msg['args']) {
+      var content = null;
+      if (msg['contentId'] == this.lastContentId_) {
+        content = this.lastContent_;
+      }
+      this.commandListener_(msg['args'], content);
+    }
+  }, this));
+};
+goog.inherits(cvox.ChromeBraille, cvox.AbstractBraille);
+
+
+/** @override */
+cvox.ChromeBraille.prototype.write = function(params) {
+  this.lastContent_ = params;
+  this.updateLastContentId_();
+  var outParams = params.toJson();
+
+  var message = {'target': 'BRAILLE',
+                 'action': 'write',
+                 'params': outParams,
+                 'contentId' : this.lastContentId_};
+
+  cvox.ExtensionBridge.send(message);
+};
+
+
+/** @private */
+cvox.ChromeBraille.prototype.updateLastContentId_ = function() {
+  this.lastContentId_ = cvox.ExtensionBridge.uniqueId() + '.' +
+      this.nextLocalId_++;
+};
+
+
+/** @override */
+cvox.ChromeBraille.prototype.setCommandListener = function(func) {
+  this.commandListener_ = func;
+};
+
+
+/**
+ * Dispatches braille input commands.
+ * @param {!cvox.BrailleKeyEvent} brailleEvt The braille key event.
+ * @param {cvox.NavBraille} content display content when command was issued,
+ *                                  if available.
+ * @private
+ */
+cvox.ChromeBraille.prototype.defaultCommandListener_ = function(brailleEvt,
+                                                                content) {
+  var command = cvox.ChromeVoxUserCommands.commands[brailleEvt.command];
+  if (command) {
+    command({event: brailleEvt, content: content});
+  } else {
+    console.error('Unknown braille command: ' + JSON.stringify(brailleEvt));
+  }
+};
+
+
+/** Export platform constructor. */
+cvox.HostFactory.brailleConstructor = cvox.ChromeBraille;