Refresh button

src/application.vala

@@ -37,20 +37,25 @@ namespace Hamlocator {
 
         public override void activate () {
             base.activate ();
-            var win = this.active_window;
+            var win = (Hamlocator.Window) this.active_window;
             if (win == null) {
-                win = new Hamlocator.Window (this);
+                win = new Hamlocator.Window (this, this.refresh_location);
             }
+            refresh_location();
             win.present ();
+        }
 
+        private void refresh_location() {
+            var win = (Hamlocator.Window) this.active_window;
+            win.SetRefreshButtonEnabled(false);
             location.get_current_location.begin((obj, res) => {
-                var w = (Hamlocator.Window) this.active_window;
                 GClue.Location pos = location.get_current_location.end(res);
                 if (pos == null) {
-                    w.SetLabel("unable to get location");
+                    win.SetLabel("unable to get location");
                 } else {
-                    w.SetLabel(@"got location: lat:$(pos.latitude) lon:$(pos.longitude)");
+                    win.SetLabel(@"got location: lat:$(pos.latitude) lon:$(pos.longitude)");
                 }
+                win.SetRefreshButtonEnabled(true);
             });
         }
 

src/window.ui

@@ -6,6 +6,11 @@
     <property name="default-height">300</property>
     <child type="titlebar">
       <object class="GtkHeaderBar" id="header_bar">
+        <child>
+          <object class="GtkButton" id="refresh_btn">
+            <property name="icon-name">view-refresh-symbolic</property>
+          </object>
+        </child>
         <child type="end">
           <object class="GtkMenuButton">
             <property name="icon-name">open-menu-symbolic</property>

src/window.vala

@@ -17,17 +17,26 @@
  */
 
 namespace Hamlocator {
+    public delegate void TriggerRefreshFunc();
+
     [GtkTemplate (ui = "/eu/fl9/hamlocator/window.ui")]
     public class Window : Gtk.ApplicationWindow {
         [GtkChild]
         private unowned Gtk.Label label;
+        [GtkChild]
+        private unowned Gtk.Button refresh_btn;
 
-        public Window (Gtk.Application app) {
+        public Window (Gtk.Application app, TriggerRefreshFunc trigger_refresh) {
             Object (application: app);
+            refresh_btn.clicked.connect(() => { trigger_refresh(); });
         }
 
         public void SetLabel(string text) {
             label.label = text;
         }
+
+        public void SetRefreshButtonEnabled(bool e) {
+            refresh_btn.sensitive = e;
+        }
     }
 }