moel@176: /*
moel@176:   
moel@176:   Version: MPL 1.1/GPL 2.0/LGPL 2.1
moel@176: 
moel@176:   The contents of this file are subject to the Mozilla Public License Version
moel@176:   1.1 (the "License"); you may not use this file except in compliance with
moel@176:   the License. You may obtain a copy of the License at
moel@176:  
moel@176:   http://www.mozilla.org/MPL/
moel@176: 
moel@176:   Software distributed under the License is distributed on an "AS IS" basis,
moel@176:   WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
moel@176:   for the specific language governing rights and limitations under the License.
moel@176: 
moel@176:   The Original Code is the Open Hardware Monitor code.
moel@176: 
moel@176:   The Initial Developer of the Original Code is 
moel@176:   Michael Möller <m.moeller@gmx.ch>.
moel@176:   Portions created by the Initial Developer are Copyright (C) 2010
moel@176:   the Initial Developer. All Rights Reserved.
moel@176: 
moel@176:   Contributor(s):
moel@176: 
moel@176:   Alternatively, the contents of this file may be used under the terms of
moel@176:   either the GNU General Public License Version 2 or later (the "GPL"), or
moel@176:   the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
moel@176:   in which case the provisions of the GPL or the LGPL are applicable instead
moel@176:   of those above. If you wish to allow use of your version of this file only
moel@176:   under the terms of either the GPL or the LGPL, and not to allow others to
moel@176:   use your version of this file under the terms of the MPL, indicate your
moel@176:   decision by deleting the provisions above and replace them with the notice
moel@176:   and other provisions required by the GPL or the LGPL. If you do not delete
moel@176:   the provisions above, a recipient may use your version of this file under
moel@176:   the terms of any one of the MPL, the GPL or the LGPL.
moel@176:  
moel@176: */
moel@176: 
moel@176: using System;
moel@176: using System.Drawing;
moel@176: using System.Reflection;
moel@176: using System.Runtime.InteropServices;
moel@176: using System.Windows.Forms;
moel@176: 
moel@176: namespace OpenHardwareMonitor.GUI {
moel@176:   public class GadgetWindow : NativeWindow {
moel@176: 
moel@176:     private bool visible = false;
moel@176:     private bool lockPosition = false;
moel@176:     private bool alwaysOnTop = false;
moel@176:     private byte opacity = 255;
moel@176:     private Point location = new Point(100, 100);
moel@176:     private Size size = new Size(130, 84);
moel@176:     private ContextMenu contextMenu = null;
moel@176:     private MethodInfo commandDispatch;
moel@176: 
moel@176:     public GadgetWindow() {
moel@176:       Type commandType = 
moel@176:         typeof(Form).Assembly.GetType("System.Windows.Forms.Command");
moel@176:       commandDispatch = commandType.GetMethod("DispatchID", 
moel@176:         BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public, 
moel@176:         null, new Type[]{ typeof(int) }, null);
moel@176: 
moel@176:       this.CreateHandle(CreateParams);
moel@176: 
moel@176:       // move window to the bottom
moel@176:       MoveToBottom(Handle);
moel@176: 
moel@176:       // prevent window from fading to a glass sheet when peek is invoked
moel@176:       try {
moel@176:         bool value = true;
moel@176:         int r = NativeMethods.DwmSetWindowAttribute(Handle,
moel@176:           WindowAttribute.DWMWA_EXCLUDED_FROM_PEEK, ref value,
moel@176:           Marshal.SizeOf(value));
moel@176:       } catch (DllNotFoundException) { } catch (EntryPointNotFoundException) { }
moel@176:     }
moel@176: 
moel@176:     private void ShowDesktopChanged(bool showDesktop) {
moel@176:       if (showDesktop) {
moel@176:         MoveToTopMost(Handle);
moel@176:       } else {
moel@176:         MoveToBottom(Handle);
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     private void MoveToBottom(IntPtr handle) {
moel@176:       NativeMethods.SetWindowPos(handle, HWND_BOTTOM, 0, 0, 0, 0,
moel@176:         SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOSENDCHANGING);
moel@176:     }
moel@176: 
moel@176:     private void MoveToTopMost(IntPtr handle) {
moel@176:       NativeMethods.SetWindowPos(handle, HWND_TOPMOST, 0, 0, 0, 0,
moel@176:         SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOSENDCHANGING);
moel@176:     }
moel@176: 
moel@176:     private void ShowContextMenu(Point position) {
moel@176:       NativeMethods.TrackPopupMenuEx(contextMenu.Handle, 
moel@176:         TPM_RIGHTBUTTON | TPM_VERTICAL, position.X,
moel@176:         position.Y, Handle, IntPtr.Zero);
moel@176:     }
moel@176: 
moel@176:     protected virtual CreateParams CreateParams {
moel@176:       get {
moel@176:         CreateParams cp = new CreateParams();
moel@176:         cp.Width = size.Width;
moel@176:         cp.Height = size.Height;
moel@176:         cp.X = location.X;
moel@176:         cp.Y = location.Y;
moel@176:         cp.ExStyle = WS_EX_LAYERED | WS_EX_TOOLWINDOW;
moel@176:         return cp;
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     protected override void WndProc(ref Message message) {
moel@176:       switch (message.Msg) {
moel@176:         case WM_COMMAND:
moel@176:           // need to dispatch the message for the context menu
moel@176:           if (message.LParam == IntPtr.Zero) 
moel@176:             commandDispatch.Invoke(null, new object[] { 
moel@176:               message.WParam.ToInt32() & 0xFFFF });          
moel@176:           break;
moel@176:         case WM_NCHITTEST:           
moel@176:           // all pixels of the form belong to the caption
moel@176:           message.Result = HTCAPTION; 
moel@176:           break;
moel@176:         case WM_NCLBUTTONDBLCLK:  
moel@176:           message.Result = IntPtr.Zero; break;
moel@176:         case WM_NCRBUTTONDOWN:
moel@176:           message.Result = IntPtr.Zero; break;
moel@176:         case WM_NCRBUTTONUP:
moel@176:           if (contextMenu != null)
moel@176:             ShowContextMenu(new Point(
moel@176:               (int)((uint)message.LParam & 0xFFFF), 
moel@176:               (int)(((uint)message.LParam >>16) & 0xFFFF)));          
moel@176:           message.Result = IntPtr.Zero; 
moel@176:           break;
moel@176:         case WM_WINDOWPOSCHANGING:         
moel@176:           WindowPos wp = (WindowPos)Marshal.PtrToStructure(
moel@176:             message.LParam, typeof(WindowPos));
moel@176: 
moel@176:           // add the nomove flag if position is locked
moel@176:           if (lockPosition)
moel@176:             wp.flags |= SWP_NOMOVE;
moel@176: 
moel@176:           // prevent the window from leaving the screen
moel@176:           if ((wp.flags & SWP_NOMOVE) == 0) {            
moel@176:             Rectangle rect = Screen.GetWorkingArea(new Point(wp.x, wp.y));
moel@176:             const int margin = 20;
moel@176:             wp.x = Math.Max(wp.x, rect.Left - wp.cx + margin);
moel@176:             wp.x = Math.Min(wp.x, rect.Right - margin);
moel@176:             wp.y = Math.Max(wp.y, rect.Top - wp.cy + margin);
moel@176:             wp.y = Math.Min(wp.y, rect.Bottom - margin);
moel@176: 
moel@176:             // raise the event if location changed
moel@176:             if (location.X != wp.x || location.Y != wp.y) {
moel@176:               location = new Point(wp.x, wp.y);
moel@176:               if (LocationChanged != null)
moel@176:                 LocationChanged(this, EventArgs.Empty);
moel@176:             }
moel@176:           }          
moel@176: 
moel@176:           Marshal.StructureToPtr(wp, message.LParam, false);
moel@176:           message.Result = IntPtr.Zero;
moel@176:           break;           
moel@176:         default:
moel@176:           base.WndProc(ref message); break;
moel@176:       }      
moel@176:     }
moel@176: 
moel@176:     private BlendFunction CreateBlendFunction() {
moel@176:       BlendFunction blend = new BlendFunction();
moel@176:       blend.BlendOp = AC_SRC_OVER;
moel@176:       blend.BlendFlags = 0;
moel@176:       blend.SourceConstantAlpha = opacity;
moel@176:       blend.AlphaFormat = AC_SRC_ALPHA;
moel@176:       return blend;
moel@176:     }
moel@176: 
moel@176:     public void Update(Bitmap bitmap) {
moel@176:       IntPtr screen = NativeMethods.GetDC(IntPtr.Zero);
moel@176:       IntPtr memory = NativeMethods.CreateCompatibleDC(screen);
moel@176:       IntPtr newHBitmap = IntPtr.Zero;
moel@176:       IntPtr oldHBitmap = IntPtr.Zero;
moel@176: 
moel@176:       try {
moel@176:         newHBitmap = bitmap.GetHbitmap(Color.Black);
moel@176:         oldHBitmap = NativeMethods.SelectObject(memory, newHBitmap);
moel@176: 
moel@176:         Size size = bitmap.Size;
moel@176:         Point pointSource = Point.Empty;
moel@176:         Point topPos = Location;
moel@176: 
moel@176:         BlendFunction blend = CreateBlendFunction();
moel@176:         NativeMethods.UpdateLayeredWindow(Handle, screen, ref topPos,
moel@176:           ref size, memory, ref pointSource, 0, ref blend, ULW_ALPHA);
moel@176:       } finally {
moel@176:         NativeMethods.ReleaseDC(IntPtr.Zero, screen);
moel@176:         if (newHBitmap != IntPtr.Zero) {
moel@176:           NativeMethods.SelectObject(memory, oldHBitmap);
moel@176:           NativeMethods.DeleteObject(newHBitmap);
moel@176:         }
moel@176:         NativeMethods.DeleteDC(memory);
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     public byte Opacity {
moel@176:       get {
moel@176:         return opacity;
moel@176:       }
moel@176:       set {
moel@176:         if (opacity != value) {
moel@176:           opacity = value;
moel@176:           BlendFunction blend = CreateBlendFunction();
moel@176:           NativeMethods.UpdateLayeredWindow(Handle, IntPtr.Zero, IntPtr.Zero,
moel@176:             IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, 0, ref blend, ULW_ALPHA);
moel@176:         }
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     public bool Visible {
moel@176:       get {
moel@176:         return visible;
moel@176:       }
moel@176:       set {
moel@176:         if (visible != value) {
moel@176:           visible = value;
moel@176:           NativeMethods.SetWindowPos(Handle, IntPtr.Zero, 0, 0, 0, 0,
moel@176:             SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOZORDER |
moel@176:             (value ? SWP_SHOWWINDOW : SWP_HIDEWINDOW));
moel@180:           if (value) {
moel@180:             if (!alwaysOnTop)
moel@180:               ShowDesktop.Instance.ShowDesktopChanged += ShowDesktopChanged;
moel@180:           } else {
moel@180:             if (!alwaysOnTop)
moel@180:               ShowDesktop.Instance.ShowDesktopChanged -= ShowDesktopChanged;
moel@180:           }
moel@176:         }
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     // if locked, the window can not be moved
moel@176:     public bool LockPosition {
moel@176:       get {
moel@176:         return lockPosition;
moel@176:       }
moel@176:       set {
moel@176:         lockPosition = value;
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     public bool AlwaysOnTop {
moel@176:       get {
moel@176:         return alwaysOnTop;
moel@176:       }
moel@176:       set {
moel@176:         if (value != alwaysOnTop) {
moel@176:           alwaysOnTop = value;
moel@176:           if (alwaysOnTop) {
moel@180:             if (visible)
moel@180:               ShowDesktop.Instance.ShowDesktopChanged -= ShowDesktopChanged;
moel@176:             MoveToTopMost(Handle);            
moel@176:           } else {
moel@176:             MoveToBottom(Handle);
moel@180:             if (visible)
moel@180:               ShowDesktop.Instance.ShowDesktopChanged += ShowDesktopChanged;
moel@176:           }
moel@176:         }
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     public Size Size {
moel@176:       get {
moel@176:         return size; 
moel@176:       }
moel@176:       set {
moel@176:         if (size != value) {
moel@176:           size = value;
moel@176:           NativeMethods.SetWindowPos(Handle, IntPtr.Zero, 0, 0, size.Width,
moel@176:             size.Height, SWP_NOMOVE | SWP_NOACTIVATE | SWP_NOZORDER | 
moel@176:             SWP_NOSENDCHANGING);
moel@176:         }
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     public Point Location {
moel@176:       get {
moel@176:         return location;
moel@176:       }
moel@176:       set {
moel@176:         NativeMethods.SetWindowPos(Handle, IntPtr.Zero, value.X, value.Y, 0,
moel@176:           0, SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOSENDCHANGING);
moel@176:         location = value;
moel@176:         if (LocationChanged != null)
moel@176:           LocationChanged(this, EventArgs.Empty);
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     public event EventHandler LocationChanged;
moel@176: 
moel@176:     public ContextMenu ContextMenu {
moel@176:       get {
moel@176:         return contextMenu;
moel@176:       }
moel@176:       set {
moel@176:         this.contextMenu = value;
moel@176:       }
moel@176:     }
moel@176: 
moel@176:     [StructLayout(LayoutKind.Sequential, Pack = 1)]
moel@176:     private struct BlendFunction {
moel@176:       public byte BlendOp;
moel@176:       public byte BlendFlags;
moel@176:       public byte SourceConstantAlpha;
moel@176:       public byte AlphaFormat;
moel@176:     }
moel@176: 
moel@176:     [StructLayout(LayoutKind.Sequential, Pack = 1)]
moel@176:     private struct WindowPos {
moel@176:       public IntPtr hwnd;
moel@176:       public IntPtr hwndInsertAfter;
moel@176:       public int x;
moel@176:       public int y;
moel@176:       public int cx;
moel@176:       public int cy;
moel@176:       public uint flags;
moel@176:     }
moel@176: 
moel@176:     public static readonly IntPtr HWND_BOTTOM = (IntPtr)1;
moel@176:     public static readonly IntPtr HWND_TOPMOST = (IntPtr)(-1);
moel@176: 
moel@176:     public const int WS_EX_LAYERED = 0x00080000;
moel@176:     public const int WS_EX_TOOLWINDOW = 0x00000080;
moel@176: 
moel@176:     public const uint SWP_NOSIZE = 0x0001;
moel@176:     public const uint SWP_NOMOVE = 0x0002;
moel@176:     public const uint SWP_NOACTIVATE = 0x0010;
moel@176:     public const uint SWP_HIDEWINDOW = 0x0080;
moel@176:     public const uint SWP_SHOWWINDOW = 0x0040;
moel@176:     public const uint SWP_NOZORDER = 0x0004;
moel@176:     public const uint SWP_NOSENDCHANGING = 0x0400;
moel@176: 
moel@176:     public const int ULW_COLORKEY = 0x00000001;
moel@176:     public const int ULW_ALPHA = 0x00000002;
moel@176:     public const int ULW_OPAQUE = 0x00000004;
moel@176: 
moel@176:     public const byte AC_SRC_OVER = 0x00;
moel@176:     public const byte AC_SRC_ALPHA = 0x01;
moel@176: 
moel@176:     public const int WM_NCHITTEST = 0x0084;
moel@176:     public const int WM_NCLBUTTONDBLCLK = 0x00A3;
moel@176:     public const int WM_NCLBUTTONDOWN = 0x00A1;
moel@176:     public const int WM_NCLBUTTONUP = 0x00A2;
moel@176:     public const int WM_NCRBUTTONDOWN = 0x00A4;
moel@176:     public const int WM_NCRBUTTONUP = 0x00A5;
moel@176:     public const int WM_WINDOWPOSCHANGING = 0x0046;
moel@176:     public const int WM_COMMAND = 0x0111;
moel@176: 
moel@176:     public const int TPM_RIGHTBUTTON = 0x0002;
moel@176:     public const int TPM_VERTICAL = 0x0040;
moel@176: 
moel@176:     public readonly IntPtr HTCAPTION = (IntPtr)2;
moel@176: 
moel@176:     private enum WindowAttribute : int {
moel@176:       DWMWA_NCRENDERING_ENABLED = 1,
moel@176:       DWMWA_NCRENDERING_POLICY,
moel@176:       DWMWA_TRANSITIONS_FORCEDISABLED,
moel@176:       DWMWA_ALLOW_NCPAINT,
moel@176:       DWMWA_CAPTION_BUTTON_BOUNDS,
moel@176:       DWMWA_NONCLIENT_RTL_LAYOUT,
moel@176:       DWMWA_FORCE_ICONIC_REPRESENTATION,
moel@176:       DWMWA_FLIP3D_POLICY,
moel@176:       DWMWA_EXTENDED_FRAME_BOUNDS,
moel@176:       DWMWA_HAS_ICONIC_BITMAP,
moel@176:       DWMWA_DISALLOW_PEEK,
moel@176:       DWMWA_EXCLUDED_FROM_PEEK,
moel@176:       DWMWA_LAST
moel@176:     }
moel@176: 
moel@176:     private static class NativeMethods {
moel@176:       private const string USER = "user32.dll";
moel@176:       private const string GDI = "gdi32.dll";
moel@176:       public const string DWMAPI = "dwmapi.dll";
moel@176: 
moel@176:       [DllImport(USER, CallingConvention = CallingConvention.Winapi)]
moel@176:       [return: MarshalAs(UnmanagedType.Bool)]
moel@176:       public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, 
moel@176:         ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc, 
moel@176:         int crKey, ref BlendFunction pblend, int dwFlags);
moel@176: 
moel@176:       [DllImport(USER, CallingConvention = CallingConvention.Winapi)]
moel@176:       [return: MarshalAs(UnmanagedType.Bool)]
moel@176:       public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst,
moel@176:         IntPtr pptDst, IntPtr psize, IntPtr hdcSrc, IntPtr pprSrc,
moel@176:         int crKey, ref BlendFunction pblend, int dwFlags);  
moel@176: 
moel@176:       [DllImport(USER, CallingConvention = CallingConvention.Winapi)]
moel@176:       public static extern IntPtr GetDC(IntPtr hWnd);
moel@176: 
moel@176:       [DllImport(USER, CallingConvention = CallingConvention.Winapi)]
moel@176:       public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
moel@176: 
moel@176:       [DllImport(USER, CallingConvention = CallingConvention.Winapi)]
moel@176:       public static extern bool SetWindowPos(IntPtr hWnd,
moel@176:         IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
moel@176: 
moel@176:       [DllImport(USER, CallingConvention = CallingConvention.Winapi)]
moel@176:       public static extern bool TrackPopupMenuEx(IntPtr hMenu, uint uFlags, 
moel@176:         int x, int y, IntPtr hWnd, IntPtr tpmParams);
moel@176: 
moel@176:       [DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
moel@176:       public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
moel@176: 
moel@176:       [DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
moel@176:       [return: MarshalAs(UnmanagedType.Bool)]
moel@176:       public static extern bool DeleteDC(IntPtr hdc);
moel@176:       
moel@176:       [DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
moel@176:       public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
moel@176: 
moel@176:       [DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
moel@176:       [return: MarshalAs(UnmanagedType.Bool)]
moel@176:       public static extern bool DeleteObject(IntPtr hObject);
moel@176: 
moel@176:       [DllImport(DWMAPI, CallingConvention = CallingConvention.Winapi)]
moel@176:       public static extern int DwmSetWindowAttribute(IntPtr hwnd,
moel@176:         WindowAttribute dwAttribute, ref bool pvAttribute, int cbAttribute);
moel@176:     }    
moel@176:   }
moel@176: }