MessageTray: Use status from gnome-session

This patch modifies MessageTray behaviour so that normal (not urgent)
notifications are not shown when the user is Busy (they're sent
immediately to the Summary area). When status is then changed,
notifications still pending are shown again.
Additionally, when status is modified from Idle to anything other than
Busy, the message tray is forced open for 4 seconds, so that summary
icons are visible.

https://bugzilla.gnome.org/show_bug.cgi?id=617225

js/ui/messageTray.js

@@ -11,11 +11,12 @@ const Pango = imports.gi.Pango;
 const Shell = imports.gi.Shell;
 const Signals = imports.signals;
 const St = imports.gi.St;
-const Tweener = imports.ui.tweener;
 
-const Main = imports.ui.main;
 const BoxPointer = imports.ui.boxpointer;
+const GnomeSession = imports.misc.gnomeSession;
+const Main = imports.ui.main;
 const Params = imports.misc.params;
+const Tweener = imports.ui.tweener;
 const Util = imports.misc.util;
 
 const Gettext = imports.gettext.domain('gnome-shell');
@@ -24,6 +25,7 @@ const _ = Gettext.gettext;
 const ANIMATION_TIME = 0.2;
 const NOTIFICATION_TIMEOUT = 4;
 const SUMMARY_TIMEOUT = 1;
+const LONGER_SUMMARY_TIMEOUT = 4;
 
 const HIDE_TIMEOUT = 0.2;
 const LONGER_HIDE_TIMEOUT = 0.6;
@@ -940,6 +942,13 @@ function MessageTray() {
 
 MessageTray.prototype = {
     _init: function() {
+        this._presence = new GnomeSession.Presence();
+        this._userStatus = GnomeSession.PresenceStatus.AVAILABLE;
+        this._busy = false;
+        this._backFromAway = false;
+        this._presence.connect('StatusChanged', Lang.bind(this, this._onStatusChanged));
+        this._presence.getStatus(Lang.bind(this, this._onStatusChanged));
+
         this.actor = new St.Group({ name: 'message-tray',
                                     reactive: true,
                                     track_hover: true });
@@ -1412,6 +1421,28 @@ MessageTray.prototype = {
         }
     },
 
+    _onStatusChanged: function(presence, status) {
+        this._backFromAway = (this._userStatus == GnomeSession.PresenceStatus.IDLE && this._userStatus != status);
+        this._userStatus = status;
+
+        if (status == GnomeSession.PresenceStatus.BUSY) {
+            // remove notification and allow the summary to be closed now
+            this._updateNotificationTimeout(0);
+            if (this._summaryTimeoutId) {
+                Mainloop.source_remove(this._summaryTimeoutId);
+                this._summaryTimeoutId = 0;
+            }
+            this._busy = true;
+        } else if (status != GnomeSession.PresenceStatus.IDLE) {
+            // We preserve the previous value of this._busy if the status turns to IDLE
+            // so that we don't start showing notifications queued during the BUSY state
+            // as the screensaver gets activated.
+            this._busy = false;
+        }
+
+        this._updateState();
+    },
+
     _onTrayLeftTimeout: function() {
         let [x, y, mods] = global.get_pointer();
         // We extend the timeout once if the mouse moved no further than MOUSE_LEFT_ACTOR_THRESHOLD to either side or up.
@@ -1450,7 +1481,8 @@ MessageTray.prototype = {
     // at the present time.
     _updateState: function() {
         // Notifications
-        let notificationsPending = this._notificationQueue.length > 0;
+        let notificationsPending = this._notificationQueue.length > 0 &&
+                                   (!this._busy || this._notificationQueue[0].urgency == Urgency.CRITICAL);
         let notificationPinned = this._pointerInTray && !this._pointerInSummary && !this._notificationRemoved;
         let notificationExpanded = this._notificationBin.y < 0;
         let notificationExpired = (this._notificationTimeoutId == 0 && !(this._notification && this._notification.urgency == Urgency.CRITICAL) && !this._pointerInTray && !this._locked) || this._notificationRemoved;
@@ -1479,10 +1511,16 @@ MessageTray.prototype = {
         let notificationsDone = !notificationsVisible && !notificationsPending;
 
         if (this._summaryState == State.HIDDEN) {
-            if (notificationsDone && this._newSummaryItems.length > 0)
+            if (this._backFromAway) {
-                this._showSummary(true);
+                // Immediately set this to false, so that we don't schedule a timeout later
-            else if (summarySummoned)
+                this._backFromAway = false;
-                this._showSummary(false);
+                if (!this._busy)
+                    this._showSummary(LONGER_SUMMARY_TIMEOUT);
+            } else if (notificationsDone && this._newSummaryItems.length > 0 && !this._busy) {
+                this._showSummary(SUMMARY_TIMEOUT);
+            } else if (summarySummoned) {
+                this._showSummary(0);
+            }
         } else if (this._summaryState == State.SHOWN) {
             if (!summaryPinned)
                 this._hideSummary();
@@ -1718,7 +1756,7 @@ MessageTray.prototype = {
         this._focusGrabber.grabFocus(this._notification.actor);
     },
 
-    _showSummary: function(withTimeout) {
+    _showSummary: function(timeout) {
         let primary = global.get_primary_monitor();
         this._summaryBin.opacity = 0;
         this._summaryBin.y = this.actor.height;
@@ -1729,16 +1767,16 @@ MessageTray.prototype = {
                       transition: 'easeOutQuad',
                       onComplete: this._showSummaryCompleted,
                       onCompleteScope: this,
-                      onCompleteParams: [withTimeout]
+                      onCompleteParams: [timeout]
                     });
     },
 
-    _showSummaryCompleted: function(withTimeout) {
+    _showSummaryCompleted: function(timeout) {
         this._newSummaryItems = [];
 
-        if (withTimeout) {
+        if (timeout != 0) {
             this._summaryTimeoutId =
-                Mainloop.timeout_add(SUMMARY_TIMEOUT * 1000,
+                Mainloop.timeout_add(timeout * 1000,
                                      Lang.bind(this, this._summaryTimeout));
         }
     },