Provide skeleton for ChromeVox next.

BUG=372578
NOTRY=true

Review URL: https://codereview.chromium.org/272013002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271293 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -1395,6 +1395,10 @@
     'ozone_platform_ozonex%': 0,
     'ozone_platform_test%': 0,
 
+    # Chrome OS: whether to also build the upcoming version of
+    # ChromeVox, which can then be enabled via a command-line switch.
+    'use_chromevox_next%': 0,
+
     'conditions': [
       # Enable the Syzygy optimization step for the official builds.
       ['OS=="win" and buildtype=="Official" and syzyasan!=1', {

chrome/browser/browser_resources.grd

@@ -297,6 +297,7 @@
         <include name="IDR_CRYPTOHOME_JS" file="resources\chromeos\cryptohome.js" type="BINDATA" />
         <!-- manifest file of ChromeVox accessibility extension -->
         <include name="IDR_CHROMEVOX_MANIFEST" file="resources\chromeos\chromevox\manifest.json" type="BINDATA" />
+        <include name="IDR_CHROMEVOX2_MANIFEST" file="resources\chromeos\chromevox2\manifest.json" type="BINDATA" />
         <include name="IDR_CHROMEVOX_GUEST_MANIFEST" file="resources\chromeos\chromevox\manifest_guest.json" type="BINDATA" />
         <!-- manifest file of Connectivity Diagnostics app -->
         <include name="IDR_CONNECTIVITY_DIAGNOSTICS_MANIFEST" file="resources\chromeos\connectivity_diagnostics\manifest.json" type="BINDATA" />

chrome/browser/extensions/component_loader.cc

@@ -330,6 +330,11 @@ std::string ComponentLoader::AddChromeVoxExtension() {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   int idr = command_line->HasSwitch(chromeos::switches::kGuestSession) ?
       IDR_CHROMEVOX_GUEST_MANIFEST : IDR_CHROMEVOX_MANIFEST;
+
+  // TODO(dtseng): Guest mode manifest for ChromeVox Next pending work to
+  // generate manifests.
+  if (command_line->HasSwitch(chromeos::switches::kEnableChromeVoxNext))
+    idr = IDR_CHROMEVOX2_MANIFEST;
   return Add(idr, base::FilePath(extension_misc::kChromeVoxExtensionPath));
 }
 

chrome/browser/resources/chromeos/chromevox2/OWNERS

@@ -0,0 +1,4 @@
+aboxhall@chromium.org
+dmazzoni@chromium.org
+dtseng@chromium.org
+plundblad@chromium.org

chrome/browser/resources/chromeos/chromevox2/chromevox.gyp

@@ -0,0 +1,31 @@
+# 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.
+
+{
+  'conditions': [
+    ['chromeos==1 and disable_nacl==0 and disable_nacl_untrusted==0', {
+      'targets': [
+        {
+          'target_name': 'chromevox2_resources',
+          'type': 'none',
+          'copies': [
+            {
+              'destination': '<(PRODUCT_DIR)/resources/chromeos/chromevox/cvox2/background',
+              'files': [
+                'cvox2/background/background.html',
+                'cvox2/background/background.js',
+              ],
+            },
+            {
+              'destination': '<(PRODUCT_DIR)/resources/chromeos/chromevox/cvox2/injected',
+              'files': [
+                'cvox2/injected/injected.js',
+              ],
+            },
+          ],
+        },
+      ],
+    }],
+  ],
+}

chrome/browser/resources/chromeos/chromevox2/cvox2/background/background.html

@@ -0,0 +1,5 @@
+<!-- ChromeVox classic -->
+<script src="../../chromeVoxChromeBackgroundScript.js"></script>
+
+<!-- ChromeVox Next -->
+<script src="background.js"></script>

chrome/browser/resources/chromeos/chromevox2/cvox2/background/background.js

@@ -0,0 +1,93 @@
+// 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 The entry point for all ChromeVox2 related code for the
+ * background page.
+ */
+
+/** ChromeVox2 namespace */
+var cvox2 = function() {};
+
+/** Namespace for global objects in the background page. */
+cvox2.global = function() {};
+
+/** Classic Chrome accessibility API. */
+cvox2.global.accessibility =
+    chrome.accessibilityPrivate || chrome.experimental.accessibility;
+
+/**
+ * ChromeVox2 background page.
+ */
+cvox2.Background = function() {
+  // Only needed with unmerged ChromeVox classic loaded before.
+  cvox2.global.accessibility.setAccessibilityEnabled(false);
+  chrome.automation.getDesktop(this.onGotDesktop.bind(this));
+};
+
+cvox2.Background.prototype = {
+  /**
+   * ID of the port used to communicate between content script and background
+   * page.
+   * @const {string}
+   */
+  PORT_ID: 'chromevox2',
+
+  /**
+   * Waits until a desktop automation tree becomes available.
+   * Thereafter, registers a simple exploration mode for the desktop tree.
+   * @param {AutomationTree} tree The desktop automation tree.
+   */
+  onGotDesktop: function(tree) {
+    if (!tree.root) {
+      window.setTimeout(this.onGotDesktop, 500);
+      return;
+    }
+    chrome.extension.onConnect.addListener(function(port) {
+      if (port.name != this.PORT_ID)
+        return;
+      var cur = tree.root;
+      port.onMessage.addListener(function(message) {
+        switch (message.keydown) {
+          case 37:
+            cur = cur.previousSibling() || cur;
+            break;
+          case 38:
+            cur = cur.parent() || cur;
+            break;
+          case 39:
+            cur = cur.nextSibling() || cur;
+            break;
+          case 40:
+            cur = cur.firstChild() || cur;
+            break;
+        }
+        var index = 1;
+        if (cur.parent())
+          index = cur.parent().children().indexOf(cur) + 1;
+        var name = '';
+        if (cur.attributes && cur.attributes['ax_attr_name'])
+          name = cur.attributes['ax_attr_name'];
+        var utterance = index + ' ' + name + cur.role;
+        chrome.tts.speak(String(utterance), {lang: 'en-US'});
+      });
+    }.bind(this));
+
+    // Register all automation event listeners.
+    tree.root.addEventListener('focus', this.onDesktopEvent.bind(this), true);
+  },
+
+  /**
+   * A generic handler for all desktop automation events.
+   * @param {AutomationEvent} evt The event.
+   */
+  onDesktopEvent: function(evt) {
+    var output = evt.target.attributes.name + ' ' + evt.target.role;
+    cvox.ChromeVox.tts.speak(output);
+    cvox.ChromeVox.braille.write(cvox.NavBraille.fromText(output));
+  }
+};
+
+/** @type {cvox2.Background} */
+cvox2.global.backgroundObj = new cvox2.Background();

chrome/browser/resources/chromeos/chromevox2/cvox2/injected/injected.js

@@ -0,0 +1,19 @@
+// 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 The entry point for all ChromeVox2 related code for the
+ * injected content script.
+ * This script will temporarily forward any events we need during the
+ * ChromeVox/ChromeVox2 timeframe where extension APIs do not exist (e.g.
+ * keyboard events).
+ */
+
+/** namespace */
+var cvox2 = function() {};
+
+var port = chrome.extension.connect({name: 'chromevox2'});
+document.body.addEventListener('keydown', function(evt) {
+  port.postMessage({keydown: evt.keyCode});
+}, true);

chrome/browser/resources/chromeos/chromevox2/manifest.json

@@ -0,0 +1,38 @@
+{
+  "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDltVl1k15pjRzuZfMc3B69inxwm2bZeZ2O8/zFO+NluHnBm3GJ3fzdOoFGJd+M16I8p7zxxQyHeDMfWYASyCeB8XnUEDKjqNLQfCnncsANzHsYoEbYj2nEUML2P13b9q+AAvpCBpAJ4cZp81e9n1y/vbSXHE4385cgkKueItzikQIDAQAB",
+  "manifest_version": 2,
+  "name": "ChromeVox",
+  "version": "1.0",
+  "description": "ChromeVox - Giving Voice to Chrome.",
+  "background": {
+    "page": "cvox2/background/background.html"
+  },
+  "content_scripts": [
+    {
+      "matches": [ "<all_urls>" ],
+      "exclude_globs": [ "chrome-extension://mndnfokpggljbaajbnioimlmbfngpief/chromevox/background/background.html" ],
+      "all_frames": true,
+      "js": [
+        "cvox2/injected/injected.js"
+      ]
+    }
+  ],
+  "permissions": [
+    "accessibilityPrivate",
+    "automation",
+    "bookmarks",
+    "tabs",
+    "experimental",
+    "history",
+    "tts",
+    "systemPrivate",
+    "brailleDisplayPrivate",
+    "commandLinePrivate",
+    "<all_urls>"
+  ],
+  "automation": {
+    "desktop": true,
+    "interact": true
+  },
+  "default_locale": "en"
+}

chrome/chrome_resources.gyp

@@ -114,6 +114,14 @@
           ],
         }],
         ['chromeos==1 and disable_nacl==0 and disable_nacl_untrusted==0', {
+          'conditions': [
+            # TODO(dtseng): Remove use_chromevox_next once ChromeVox Next is ready for testing.
+            ['use_chromevox_next==1', {
+              'dependencies': [
+                'browser/resources/chromeos/chromevox2/chromevox.gyp:chromevox2_resources',
+              ],
+            }],
+          ],
           'copies' : [
             {
               'destination': '<(PRODUCT_DIR)/resources/chromeos/braille_ime',

chromeos/chromeos_switches.cc

@@ -68,6 +68,10 @@ const char kEchoExtensionPath[]             = "echo-ext-path";
 // Enables switching between different cellular carriers from the UI.
 const char kEnableCarrierSwitching[]        = "enable-carrier-switching";
 
+// Enables the next generation version of ChromeVox. Only valid with
+// use_chromevox_next=1 within your GYP_DEFINES.
+const char kEnableChromeVoxNext[]           = "enable-chromevox-next";
+
 // Enables consumer management, which allows user to enroll, remotely lock and
 // locate the device.
 const char kEnableConsumerManagement[]      = "enable-consumer-management";

chromeos/chromeos_switches.h

@@ -38,6 +38,7 @@ CHROMEOS_EXPORT extern const char kDisableQuickofficeComponentApp[];
 CHROMEOS_EXPORT extern const char kDisableVolumeAdjustSound[];
 CHROMEOS_EXPORT extern const char kEchoExtensionPath[];
 CHROMEOS_EXPORT extern const char kEnableCarrierSwitching[];
+CHROMEOS_EXPORT extern const char kEnableChromeVoxNext[];
 CHROMEOS_EXPORT extern const char kEnableConsumerManagement[];
 CHROMEOS_EXPORT extern const char kEnableFileManagerMTP[];
 CHROMEOS_EXPORT extern const char kEnableRollbackOption[];