Added a desktop gadget implementation.

GUI/Gadget.cs

@@ -0,0 +1,172 @@
+/*
+  
+  Version: MPL 1.1/GPL 2.0/LGPL 2.1
+
+  The contents of this file are subject to the Mozilla Public License Version
+  1.1 (the "License"); you may not use this file except in compliance with
+  the License. You may obtain a copy of the License at
+ 
+  http://www.mozilla.org/MPL/
+
+  Software distributed under the License is distributed on an "AS IS" basis,
+  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+  for the specific language governing rights and limitations under the License.
+
+  The Original Code is the Open Hardware Monitor code.
+
+  The Initial Developer of the Original Code is 
+  Michael Möller <m.moeller@gmx.ch>.
+  Portions created by the Initial Developer are Copyright (C) 2010
+  the Initial Developer. All Rights Reserved.
+
+  Contributor(s):
+
+  Alternatively, the contents of this file may be used under the terms of
+  either the GNU General Public License Version 2 or later (the "GPL"), or
+  the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+  in which case the provisions of the GPL or the LGPL are applicable instead
+  of those above. If you wish to allow use of your version of this file only
+  under the terms of either the GPL or the LGPL, and not to allow others to
+  use your version of this file under the terms of the MPL, indicate your
+  decision by deleting the provisions above and replace them with the notice
+  and other provisions required by the GPL or the LGPL. If you do not delete
+  the provisions above, a recipient may use your version of this file under
+  the terms of any one of the MPL, the GPL or the LGPL.
+ 
+*/
+
+using System;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Drawing.Imaging;
+using System.Drawing.Text;
+using System.Windows.Forms;
+
+namespace OpenHardwareMonitor.GUI {
+  public abstract class Gadget : IDisposable {
+
+    private GadgetWindow window;
+    private Bitmap buffer;
+    private Graphics graphics;
+
+    public Gadget() {
+      this.window = new GadgetWindow();
+      CreateBuffer();
+    }
+
+    public void Dispose() {
+      this.graphics.Dispose();
+      this.buffer.Dispose();
+    }
+
+    public Point Location {
+      get {
+        return window.Location;
+      }
+      set {
+        window.Location = value;
+      }
+    }
+
+    public event EventHandler LocationChanged {
+      add {
+        window.LocationChanged += value;
+      }
+      remove {
+        window.LocationChanged -= value;
+      }
+    }
+
+    protected virtual Size Size {
+      get {
+        return window.Size; 
+      }
+      set {
+        if (window.Size != value) {
+          DisposeBuffer();
+          this.window.Size = value;          
+          CreateBuffer();
+        }
+      }
+    }
+
+    public byte Opacity {
+      get {
+        return window.Opacity;
+      }
+      set {
+        window.Opacity = value;
+      }
+    }
+
+    public bool LockPosition {
+      get {
+        return window.LockPosition;
+      }
+      set {
+        window.LockPosition = value;
+      }
+    }
+
+    public bool AlwaysOnTop {
+      get {
+        return window.AlwaysOnTop;
+      }
+      set {
+        window.AlwaysOnTop = value;
+      }
+    }
+
+    public ContextMenu ContextMenu {
+      get {
+        return window.ContextMenu;
+      }
+      set {
+        window.ContextMenu = value;
+      }
+    }
+
+    private void CreateBuffer() {
+      this.buffer = new Bitmap(window.Size.Width, window.Size.Height, 
+        PixelFormat.Format32bppArgb);
+      this.graphics = Graphics.FromImage(this.buffer);
+      if (Environment.OSVersion.Version.Major > 5) {
+        this.graphics.TextRenderingHint = TextRenderingHint.SystemDefault;
+        this.graphics.SmoothingMode = SmoothingMode.HighQuality;
+      }
+    }
+
+    private void DisposeBuffer() {
+      if (buffer != null) {
+        this.buffer.Dispose();
+        this.buffer = null;
+      }
+      if (graphics != null) {
+        this.graphics.Dispose();
+        this.graphics = null;
+      }
+    }
+
+    public bool Visible {
+      get {
+        return window.Visible;
+      }
+      set {
+        if (value != window.Visible) {
+          if (value)
+            Redraw();
+          window.Visible = value;
+        }
+      }
+    }
+
+    public void Redraw() {
+      OnPaint(new PaintEventArgs(graphics, 
+        new Rectangle(Point.Empty, window.Size)));
+      window.Update(buffer);
+    }
+
+    protected abstract void OnPaint(PaintEventArgs e);
+  
+  }
+}