Make app draggable

Author: swharden

src/BasicTimer/MainWindow.xaml

@@ -9,7 +9,9 @@
         ResizeMode="NoResize"
         Title="Stupid Timer" 
         Height="{Binding WindowHeight, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
-        Width="300">
+        Width="300"
+        MouseDown="Window_MouseDown"
+        >
     <Canvas
         Name="MainCanvas"
         Background="{Binding Path=ProgressBackground, UpdateSourceTrigger=PropertyChanged, FallbackValue=#003366}" 

src/BasicTimer/MainWindow.xaml.cs

@@ -71,5 +71,11 @@ private void MenuItem_ToggleAlwaysOnTop_Click(object sender, RoutedEventArgs e)
 
         private void MenuItem_Version_Click(object sender, RoutedEventArgs e) => 
             System.Diagnostics.Process.Start("explorer", "https://github.com/swharden/BasicTimer");
+
+        private void Window_MouseDown(object sender, MouseButtonEventArgs e)
+        {
+            if (e.ChangedButton == MouseButton.Left)
+                DragMove();
+        }
     }
 }