Fixed Issue 215.

GUI/Gadget.cs

@@ -176,12 +176,16 @@ namespace OpenHardwareMonitor.GUI {
       set {
         if (value != window.Visible) {
           window.Visible = value;
+          if (VisibleChanged != null)
+            VisibleChanged(this, EventArgs.Empty);
           if (value)
             Redraw();          
         }
       }
     }
 
+    public event EventHandler VisibleChanged;
+
     public void Redraw() {
       if (!window.Visible)
         return;

GUI/SensorGadget.cs

@@ -201,6 +201,20 @@ namespace OpenHardwareMonitor.GUI {
         Redraw();
       };
 
+      VisibleChanged += delegate(object sender, EventArgs e) {
+        Rectangle bounds = new Rectangle(Location, Size);
+        Screen screen = Screen.FromRectangle(bounds);
+        Rectangle intersection = 
+          Rectangle.Intersect(screen.WorkingArea, bounds);
+        if (intersection.Width < Math.Min(16, bounds.Width) || 
+            intersection.Height < Math.Min(16, bounds.Height)) 
+        {
+          Location = new Point(
+            screen.WorkingArea.Width / 2 - bounds.Width / 2, 
+            screen.WorkingArea.Height / 2 - bounds.Height / 2);
+        }
+      };
+
       MouseDoubleClick += delegate(object obj, MouseEventArgs args) {
         SendHideShowCommand();
       };