openhardwaremonitor/GUI/GadgetWindow.cs

580 lines
19 KiB
C#

/*
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
Copyright (C) 2010-2011 Michael Möller <mmoeller@openhardwaremonitor.org>
Copyright (C) 2010 Paul Werelds <paul@werelds.net>
*/
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace OpenHardwareMonitor.GUI {
public class GadgetWindow : NativeWindow, IDisposable {
private bool visible = false;
private bool lockPositionAndSize = false;
private bool alwaysOnTop = false;
private byte opacity = 255;
private Point location = new Point(100, 100);
private Size size = new Size(130, 84);
private ContextMenu contextMenu = null;
private MethodInfo commandDispatch;
private IntPtr handleBitmapDC;
private Size bufferSize;
private Graphics graphics;
public GadgetWindow() {
Type commandType =
typeof(Form).Assembly.GetType("System.Windows.Forms.Command");
commandDispatch = commandType.GetMethod("DispatchID",
BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public,
null, new Type[]{ typeof(int) }, null);
this.CreateHandle(CreateParams);
// move window to the bottom
MoveToBottom(Handle);
// prevent window from fading to a glass sheet when peek is invoked
try {
bool value = true;
NativeMethods.DwmSetWindowAttribute(Handle,
WindowAttribute.DWMWA_EXCLUDED_FROM_PEEK, ref value,
Marshal.SizeOf(value));
} catch (DllNotFoundException) { } catch (EntryPointNotFoundException) { }
CreateBuffer();
}
private void ShowDesktopChanged(bool showDesktop) {
if (showDesktop) {
MoveToTopMost(Handle);
} else {
MoveToBottom(Handle);
}
}
private void MoveToBottom(IntPtr handle) {
NativeMethods.SetWindowPos(handle, HWND_BOTTOM, 0, 0, 0, 0,
SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOSENDCHANGING);
}
private void MoveToTopMost(IntPtr handle) {
NativeMethods.SetWindowPos(handle, HWND_TOPMOST, 0, 0, 0, 0,
SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOSENDCHANGING);
}
private void ShowContextMenu(Point position) {
NativeMethods.TrackPopupMenuEx(contextMenu.Handle,
TPM_RIGHTBUTTON | TPM_VERTICAL, position.X,
position.Y, Handle, IntPtr.Zero);
}
protected virtual CreateParams CreateParams {
get {
CreateParams cp = new CreateParams();
cp.Width = 4096;
cp.Height = 4096;
cp.X = location.X;
cp.Y = location.Y;
cp.ExStyle = WS_EX_LAYERED | WS_EX_TOOLWINDOW;
return cp;
}
}
protected override void WndProc(ref Message message) {
switch (message.Msg) {
case WM_COMMAND: {
// need to dispatch the message for the context menu
if (message.LParam == IntPtr.Zero)
commandDispatch.Invoke(null, new object[] {
message.WParam.ToInt32() & 0xFFFF });
} break;
case WM_NCHITTEST: {
message.Result = (IntPtr)HitResult.Caption;
if (HitTest != null) {
Point p = new Point(
Macros.GET_X_LPARAM(message.LParam) - location.X,
Macros.GET_Y_LPARAM(message.LParam) - location.Y
);
HitTestEventArgs e = new HitTestEventArgs(p, HitResult.Caption);
HitTest(this, e);
message.Result = (IntPtr)e.HitResult;
}
} break;
case WM_NCLBUTTONDBLCLK: {
if (MouseDoubleClick != null) {
MouseDoubleClick(this, new MouseEventArgs(MouseButtons.Left, 2,
Macros.GET_X_LPARAM(message.LParam) - location.X,
Macros.GET_Y_LPARAM(message.LParam) - location.Y, 0));
}
message.Result = IntPtr.Zero;
} break;
case WM_NCRBUTTONDOWN: {
message.Result = IntPtr.Zero;
} break;
case WM_NCRBUTTONUP: {
if (contextMenu != null)
ShowContextMenu(new Point(
Macros.GET_X_LPARAM(message.LParam),
Macros.GET_Y_LPARAM(message.LParam)
));
message.Result = IntPtr.Zero;
} break;
case WM_WINDOWPOSCHANGING: {
WindowPos wp = (WindowPos)Marshal.PtrToStructure(
message.LParam, typeof(WindowPos));
if (!lockPositionAndSize) {
// prevent the window from leaving the screen
if ((wp.flags & SWP_NOMOVE) == 0) {
Rectangle rect = Screen.GetWorkingArea(
new Rectangle(wp.x, wp.y, wp.cx, wp.cy));
const int margin = 16;
wp.x = Math.Max(wp.x, rect.Left - wp.cx + margin);
wp.x = Math.Min(wp.x, rect.Right - margin);
wp.y = Math.Max(wp.y, rect.Top - wp.cy + margin);
wp.y = Math.Min(wp.y, rect.Bottom - margin);
}
// update location and fire event
if ((wp.flags & SWP_NOMOVE) == 0) {
if (location.X != wp.x || location.Y != wp.y) {
location = new Point(wp.x, wp.y);
if (LocationChanged != null)
LocationChanged(this, EventArgs.Empty);
}
}
// update size and fire event
if ((wp.flags & SWP_NOSIZE) == 0) {
if (size.Width != wp.cx || size.Height != wp.cy) {
size = new Size(wp.cx, wp.cy);
if (SizeChanged != null)
SizeChanged(this, EventArgs.Empty);
}
}
// update the size of the layered window
if ((wp.flags & SWP_NOSIZE) == 0) {
NativeMethods.UpdateLayeredWindow(Handle, IntPtr.Zero,
IntPtr.Zero, ref size, IntPtr.Zero, IntPtr.Zero, 0,
IntPtr.Zero, 0);
}
// update the position of the layered window
if ((wp.flags & SWP_NOMOVE) == 0) {
NativeMethods.SetWindowPos(Handle, IntPtr.Zero,
location.X, location.Y, 0, 0, SWP_NOSIZE | SWP_NOACTIVATE |
SWP_NOZORDER | SWP_NOSENDCHANGING);
}
}
// do not forward any move or size messages
wp.flags |= SWP_NOSIZE | SWP_NOMOVE;
// suppress any frame changed events
wp.flags &= ~SWP_FRAMECHANGED;
Marshal.StructureToPtr(wp, message.LParam, false);
message.Result = IntPtr.Zero;
} break;
default: {
base.WndProc(ref message);
} break;
}
}
private BlendFunction CreateBlendFunction() {
BlendFunction blend = new BlendFunction();
blend.BlendOp = AC_SRC_OVER;
blend.BlendFlags = 0;
blend.SourceConstantAlpha = opacity;
blend.AlphaFormat = AC_SRC_ALPHA;
return blend;
}
private void CreateBuffer() {
IntPtr handleScreenDC = NativeMethods.GetDC(IntPtr.Zero);
handleBitmapDC = NativeMethods.CreateCompatibleDC(handleScreenDC);
NativeMethods.ReleaseDC(IntPtr.Zero, handleScreenDC);
bufferSize = size;
BitmapInfo info = new BitmapInfo();
info.Size = Marshal.SizeOf(info);
info.Width = size.Width;
info.Height = -size.Height;
info.BitCount = 32;
info.Planes = 1;
IntPtr ptr;
IntPtr hBmp = NativeMethods.CreateDIBSection(handleBitmapDC, ref info, 0,
out ptr, IntPtr.Zero, 0);
IntPtr hBmpOld = NativeMethods.SelectObject(handleBitmapDC, hBmp);
NativeMethods.DeleteObject(hBmpOld);
graphics = Graphics.FromHdc(handleBitmapDC);
if (Environment.OSVersion.Version.Major > 5) {
this.graphics.TextRenderingHint = TextRenderingHint.SystemDefault;
this.graphics.SmoothingMode = SmoothingMode.HighQuality;
}
}
private void DisposeBuffer() {
graphics.Dispose();
NativeMethods.DeleteDC(handleBitmapDC);
}
public virtual void Dispose() {
DisposeBuffer();
}
public PaintEventHandler Paint;
public void Redraw() {
if (!visible || Paint == null)
return;
if (size != bufferSize) {
DisposeBuffer();
CreateBuffer();
}
Paint(this,
new PaintEventArgs(graphics, new Rectangle(Point.Empty, size)));
Point pointSource = Point.Empty;
BlendFunction blend = CreateBlendFunction();
NativeMethods.UpdateLayeredWindow(Handle, IntPtr.Zero, IntPtr.Zero,
ref size, handleBitmapDC, ref pointSource, 0, ref blend, ULW_ALPHA);
// make sure the window is at the right location
NativeMethods.SetWindowPos(Handle, IntPtr.Zero,
location.X, location.Y, 0, 0, SWP_NOSIZE | SWP_NOACTIVATE |
SWP_NOZORDER | SWP_NOSENDCHANGING);
}
public byte Opacity {
get {
return opacity;
}
set {
if (opacity != value) {
opacity = value;
BlendFunction blend = CreateBlendFunction();
NativeMethods.UpdateLayeredWindow(Handle, IntPtr.Zero, IntPtr.Zero,
IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, 0, ref blend, ULW_ALPHA);
}
}
}
public bool Visible {
get {
return visible;
}
set {
if (visible != value) {
visible = value;
NativeMethods.SetWindowPos(Handle, IntPtr.Zero, 0, 0, 0, 0,
SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOZORDER |
(value ? SWP_SHOWWINDOW : SWP_HIDEWINDOW));
if (value) {
if (!alwaysOnTop)
ShowDesktop.Instance.ShowDesktopChanged += ShowDesktopChanged;
} else {
if (!alwaysOnTop)
ShowDesktop.Instance.ShowDesktopChanged -= ShowDesktopChanged;
}
}
}
}
// if locked, the window can not be moved or resized
public bool LockPositionAndSize {
get {
return lockPositionAndSize;
}
set {
lockPositionAndSize = value;
}
}
public bool AlwaysOnTop {
get {
return alwaysOnTop;
}
set {
if (value != alwaysOnTop) {
alwaysOnTop = value;
if (alwaysOnTop) {
if (visible)
ShowDesktop.Instance.ShowDesktopChanged -= ShowDesktopChanged;
MoveToTopMost(Handle);
} else {
MoveToBottom(Handle);
if (visible)
ShowDesktop.Instance.ShowDesktopChanged += ShowDesktopChanged;
}
}
}
}
public Size Size {
get {
return size;
}
set {
if (size != value) {
size = value;
NativeMethods.UpdateLayeredWindow(Handle, IntPtr.Zero, IntPtr.Zero,
ref size, IntPtr.Zero, IntPtr.Zero, 0, IntPtr.Zero, 0);
if (SizeChanged != null)
SizeChanged(this, EventArgs.Empty);
}
}
}
public event EventHandler SizeChanged;
public Point Location {
get {
return location;
}
set {
if (location != value) {
location = value;
NativeMethods.SetWindowPos(Handle, IntPtr.Zero,
location.X, location.Y, 0, 0,
SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOSENDCHANGING);
if (LocationChanged != null)
LocationChanged(this, EventArgs.Empty);
}
}
}
public event EventHandler LocationChanged;
public ContextMenu ContextMenu {
get {
return contextMenu;
}
set {
this.contextMenu = value;
}
}
public event HitTestEventHandler HitTest;
public event MouseEventHandler MouseDoubleClick;
[StructLayout(LayoutKind.Sequential, Pack = 1)]
private struct BlendFunction {
public byte BlendOp;
public byte BlendFlags;
public byte SourceConstantAlpha;
public byte AlphaFormat;
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
private struct WindowPos {
public IntPtr hwnd;
public IntPtr hwndInsertAfter;
public int x;
public int y;
public int cx;
public int cy;
public uint flags;
}
[StructLayout(LayoutKind.Sequential)]
public struct BitmapInfo {
public Int32 Size;
public Int32 Width;
public Int32 Height;
public Int16 Planes;
public Int16 BitCount;
public Int32 Compression;
public Int32 SizeImage;
public Int32 XPelsPerMeter;
public Int32 YPelsPerMeter;
public Int32 ClrUsed;
public Int32 ClrImportant;
public Int32 Colors;
}
public static readonly IntPtr HWND_BOTTOM = (IntPtr)1;
public static readonly IntPtr HWND_TOPMOST = (IntPtr)(-1);
public const int WS_EX_LAYERED = 0x00080000;
public const int WS_EX_TOOLWINDOW = 0x00000080;
public const uint SWP_NOSIZE = 0x0001;
public const uint SWP_NOMOVE = 0x0002;
public const uint SWP_NOACTIVATE = 0x0010;
public const uint SWP_FRAMECHANGED = 0x0020;
public const uint SWP_HIDEWINDOW = 0x0080;
public const uint SWP_SHOWWINDOW = 0x0040;
public const uint SWP_NOZORDER = 0x0004;
public const uint SWP_NOSENDCHANGING = 0x0400;
public const int ULW_COLORKEY = 0x00000001;
public const int ULW_ALPHA = 0x00000002;
public const int ULW_OPAQUE = 0x00000004;
public const byte AC_SRC_OVER = 0x00;
public const byte AC_SRC_ALPHA = 0x01;
public const int WM_NCHITTEST = 0x0084;
public const int WM_NCLBUTTONDBLCLK = 0x00A3;
public const int WM_NCLBUTTONDOWN = 0x00A1;
public const int WM_NCLBUTTONUP = 0x00A2;
public const int WM_NCRBUTTONDOWN = 0x00A4;
public const int WM_NCRBUTTONUP = 0x00A5;
public const int WM_WINDOWPOSCHANGING = 0x0046;
public const int WM_COMMAND = 0x0111;
public const int TPM_RIGHTBUTTON = 0x0002;
public const int TPM_VERTICAL = 0x0040;
private enum WindowAttribute : int {
DWMWA_NCRENDERING_ENABLED = 1,
DWMWA_NCRENDERING_POLICY,
DWMWA_TRANSITIONS_FORCEDISABLED,
DWMWA_ALLOW_NCPAINT,
DWMWA_CAPTION_BUTTON_BOUNDS,
DWMWA_NONCLIENT_RTL_LAYOUT,
DWMWA_FORCE_ICONIC_REPRESENTATION,
DWMWA_FLIP3D_POLICY,
DWMWA_EXTENDED_FRAME_BOUNDS,
DWMWA_HAS_ICONIC_BITMAP,
DWMWA_DISALLOW_PEEK,
DWMWA_EXCLUDED_FROM_PEEK,
DWMWA_LAST
}
/// <summary>
/// Some macros imported and converted from the Windows SDK
/// </summary>
private static class Macros {
public static ushort LOWORD(IntPtr l) {
return (ushort) ((ulong)l & 0xFFFF);
}
public static UInt16 HIWORD(IntPtr l) {
return (ushort) (((ulong)l >> 16) & 0xFFFF);
}
public static int GET_X_LPARAM(IntPtr lp) {
return (short) LOWORD(lp);
}
public static int GET_Y_LPARAM(IntPtr lp) {
return (short) HIWORD(lp);
}
}
/// <summary>
/// Imported native methods
/// </summary>
private static class NativeMethods {
private const string USER = "user32.dll";
private const string GDI = "gdi32.dll";
public const string DWMAPI = "dwmapi.dll";
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst,
IntPtr pptDst, ref Size psize, IntPtr hdcSrc, IntPtr pprSrc,
int crKey, IntPtr pblend, int dwFlags);
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst,
IntPtr pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc,
int crKey, ref BlendFunction pblend, int dwFlags);
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst,
IntPtr pptDst, IntPtr psize, IntPtr hdcSrc, IntPtr pprSrc,
int crKey, ref BlendFunction pblend, int dwFlags);
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
public static extern IntPtr GetDC(IntPtr hWnd);
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
public static extern bool SetWindowPos(IntPtr hWnd,
IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
[DllImport(USER, CallingConvention = CallingConvention.Winapi)]
public static extern bool TrackPopupMenuEx(IntPtr hMenu, uint uFlags,
int x, int y, IntPtr hWnd, IntPtr tpmParams);
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
public static extern IntPtr CreateDIBSection(IntPtr hdc,
[In] ref BitmapInfo pbmi, uint pila, out IntPtr ppvBits,
IntPtr hSection, uint dwOffset);
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool DeleteDC(IntPtr hdc);
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
[DllImport(GDI, CallingConvention = CallingConvention.Winapi)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool DeleteObject(IntPtr hObject);
[DllImport(DWMAPI, CallingConvention = CallingConvention.Winapi)]
public static extern int DwmSetWindowAttribute(IntPtr hwnd,
WindowAttribute dwAttribute, ref bool pvAttribute, int cbAttribute);
}
}
public enum HitResult {
Transparent = -1,
Nowhere = 0,
Client = 1,
Caption = 2,
Left = 10,
Right = 11,
Top = 12,
TopLeft = 13,
TopRight = 14,
Bottom = 15,
BottomLeft = 16,
BottomRight = 17,
Border = 18
}
public delegate void HitTestEventHandler(object sender, HitTestEventArgs e);
public class HitTestEventArgs : EventArgs {
public HitTestEventArgs(Point location, HitResult hitResult) {
Location = location;
HitResult = hitResult;
}
public Point Location { get; private set; }
public HitResult HitResult { get; set; }
}
}