ui: Add keyboard accessibility dialog

Show a dialog informing the user each time the keyboard accessibility
flags are changed by one of the clutter backends (either from toggle
keys or two-keys-off modifiers).

https://bugzilla.gnome.org/show_bug.cgi?id=788564

js/js-resources.gresource.xml

@@ -61,6 +61,7 @@
     <file>ui/ibusCandidatePopup.js</file>
     <file>ui/iconGrid.js</file>
     <file>ui/inhibitShortcutsDialog.js</file>
+    <file>ui/kbdA11yDialog.js</file>
     <file>ui/keyboard.js</file>
     <file>ui/layout.js</file>
     <file>ui/lightbox.js</file>

js/ui/kbdA11yDialog.js

@@ -0,0 +1,77 @@
+const Clutter = imports.gi.Clutter;
+const Gio = imports.gi.Gio;
+const GObject = imports.gi.GObject;
+const Lang = imports.lang;
+const Dialog = imports.ui.dialog;
+const ModalDialog = imports.ui.modalDialog;
+
+const KEYBOARD_A11Y_SCHEMA    = 'org.gnome.desktop.a11y.keyboard';
+const KEY_STICKY_KEYS_ENABLED = 'stickykeys-enable';
+const KEY_SLOW_KEYS_ENABLED   = 'slowkeys-enable';
+
+var KbdA11yDialog = new Lang.Class({
+    Name: 'KbdA11yDialog',
+    Extends: GObject.Object,
+
+    _init: function() {
+        this._a11ySettings = new Gio.Settings({ schema_id: KEYBOARD_A11Y_SCHEMA });
+
+        let deviceManager = Clutter.DeviceManager.get_default();
+        deviceManager.connect('kbd-a11y-flags-changed',
+                              Lang.bind(this, this._showKbdA11yDialog));
+    },
+
+    _showKbdA11yDialog: function(deviceManager, newFlags, whatChanged) {
+        let dialog = new ModalDialog.ModalDialog();
+        let title, body;
+        let key, enabled;
+
+        if (whatChanged & Clutter.KeyboardA11yFlags.SLOW_KEYS_ENABLED) {
+            key = KEY_SLOW_KEYS_ENABLED;
+            enabled = (newFlags & Clutter.KeyboardA11yFlags.SLOW_KEYS_ENABLED) ? true : false;
+            title = enabled ?
+                    _("Slow Keys Turned On") :
+                    _("Slow Keys Turned Off");
+            body = _("You just held down the Shift key for 8 seconds. This is the shortcut " +
+                     "for the Slow Keys feature, which affects the way your keyboard works.");
+
+        } else  if (whatChanged & Clutter.KeyboardA11yFlags.STICKY_KEYS_ENABLED) {
+            key = KEY_STICKY_KEYS_ENABLED;
+            enabled = (newFlags & Clutter.KeyboardA11yFlags.STICKY_KEYS_ENABLED) ? true : false;
+            title = enabled ?
+                    _("Sticky Keys Turned On") :
+                    _("Sticky Keys Turned Off");
+            body = enabled ?
+                   _("You just pressed the Shift key 5 times in a row. This is the shortcut " +
+                     "for the Sticky Keys feature, which affects the way your keyboard works.") :
+                   _("You just pressed two keys at once, or pressed the Shift key 5 times in a row. " +
+                     "This turns off the Sticky Keys feature, which affects the way your keyboard works.");
+        } else {
+            return;
+        }
+
+        let icon = new Gio.ThemedIcon({ name: 'preferences-desktop-accessibility-symbolic' });
+        let contentParams = { icon, title, body, styleClass: 'access-dialog' };
+        let content = new Dialog.MessageDialogContent(contentParams);
+
+        dialog.contentLayout.add_actor(content);
+
+        dialog.addButton({ label: enabled ? _("Leave On") : _("Turn On"),
+                           action: () => {
+                               this._a11ySettings.set_boolean(key, true);
+                               dialog.close();
+                           },
+                           default: enabled,
+                           key: !enabled ? Clutter.Escape : null });
+
+        dialog.addButton({ label: enabled ? _("Turn Off") : _("Leave Off"),
+                           action: () => {
+                               this._a11ySettings.set_boolean(key, false);
+                               dialog.close();
+                           },
+                           default: !enabled,
+                           key: enabled ? Clutter.Escape : null });
+
+        dialog.open();
+    }
+});

js/ui/main.js

@@ -44,6 +44,7 @@ const WindowManager = imports.ui.windowManager;
 const Magnifier = imports.ui.magnifier;
 const XdndHandler = imports.ui.xdndHandler;
 const Util = imports.misc.util;
+const KbdA11yDialog = imports.ui.kbdA11yDialog;
 
 const A11Y_SCHEMA = 'org.gnome.desktop.a11y.keyboard';
 const STICKY_KEYS_ENABLE = 'stickykeys-enable';
@@ -78,6 +79,7 @@ var magnifier = null;
 var xdndHandler = null;
 var keyboard = null;
 var layoutManager = null;
+var kbdA11yDialog = null;
 let _startDate;
 let _defaultCssStylesheet = null;
 let _cssStylesheet = null;
@@ -163,6 +165,7 @@ function _initializeUI() {
     osdWindowManager = new OsdWindow.OsdWindowManager();
     osdMonitorLabeler = new OsdMonitorLabeler.OsdMonitorLabeler();
     overview = new Overview.Overview();
+    kbdA11yDialog = new KbdA11yDialog.KbdA11yDialog();
     wm = new WindowManager.WindowManager();
     magnifier = new Magnifier.Magnifier();
     if (LoginManager.canLock())

po/POTFILES.in

@@ -32,6 +32,7 @@ js/ui/endSessionDialog.js
 js/ui/extensionDownloader.js
 js/ui/extensionSystem.js
 js/ui/inhibitShortcutsDialog.js
+js/ui/kbdA11yDialog.js
 js/ui/keyboard.js
 js/ui/lookingGlass.js
 js/ui/main.js