[gnome-clocks] application: Withdraw notifications when the windows is focused

[Felipe Borges <felipeborges src gnome org>]

commit b84811662ccbf3ed6fd03e3949e15d48fe005b16
Author: Felipe Borges <felipeborges gnome org>
Date:   Wed Feb 1 12:46:25 2017 +0100

    application: Withdraw notifications when the windows is focused
    
    Clocks should dismiss (withdraw) its notifications when the windows
    is focused.
    
    The HIG[0] says that "Notifications in GNOME 3 persist after they
    have been initially displayed. It is therefore important to remove
    notification messages that are no longer relevant to the user."
    
    [0] https://developer.gnome.org/hig/stable/notifications.html.en
    
    https://bugzilla.gnome.org/show_bug.cgi?id=776043

 src/application.vala |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/src/application.vala b/src/application.vala
index f9374d8..32c3e74 100644
--- a/src/application.vala
+++ b/src/application.vala
@@ -85,6 +85,12 @@ public class Application : Gtk.Application {
 
         ensure_window ();
         window.present ();
+
+        window.focus_in_event.connect (() => {
+            withdraw_notifications ();
+
+            return false;
+        });
     }
 
     private void update_theme (Gtk.Settings settings) {
@@ -140,15 +146,18 @@ public class Application : Gtk.Application {
         system_notifications.append (notification_id);
     }
 
-    public override void shutdown () {
-        base.shutdown ();
-
-        // Withdraw all system notifications
+    private void withdraw_notifications () {
         foreach (var notification in system_notifications) {
             withdraw_notification (notification);
         }
     }
 
+    public override void shutdown () {
+        base.shutdown ();
+
+        withdraw_notifications ();
+    }
+
     void on_quit_activate () {
         quit ();
     }