/// <summary>
/// Override for the main forms WndProc method
/// This is used to intercept the forms movement so that we can move
/// blended background form at the same time, as well as check for
/// when the form is activated so we can ensure the Z-order of our
/// forms remains intact.
/// </summary>
/// <param name="m">Windows Message</param>
protected override void WndProc(ref Message m)
{
if (this.DesignMode)
{
base.WndProc(ref m);
return;
}
Win32.Message msgId = (Win32.Message)m.Msg;
bool UseBase = true;
switch (msgId)
{
case Win32.Message.WM_LBUTTONUP:
{
//Just in case
if (Win32.GetCapture() != IntPtr.Zero)
{
Win32.ReleaseCapture();
}
}
break;
case Win32.Message.WM_ENTERSIZEMOVE:
{
}
break;
case Win32.Message.WM_EXITSIZEMOVE:
{
//We've stopped dragging the form, so lets make sure that our values are correct
m_isDown.Left = false;
m_moving = false;
if (m_enhanced)
{
this.SuspendLayout();
foreach (Control ctrl in m_hiddenControls)
{
ctrl.Visible = true;
}
m_hiddenControls.Clear();
this.ResumeLayout();
updateLayeredBackground(this.ClientSize.Width, this.ClientSize.Height, m_layeredWnd.LayeredPos, false);
}
}
break;
case Win32.Message.WM_MOUSEMOVE:
//It's unlikely that we will get here unless this we really have captured the mouse
//because the entire thing is transparent, but we check anyway just to make sure
if (Win32.GetCapture() != IntPtr.Zero && m_moving)
{
//In enhanced mode we draw the main window to the layered window and then hide the main
//window. This is so that we can have perfectly smooth motion when dragging the form, as
//we cannot gurantee that the forms will ever be moved together otherwise
if (m_enhanced)
{
//Setup the device contexts we are going to use
IntPtr hdcScreen = Win32.GetWindowDC(m_layeredWnd.Handle); //Screen DC that the layered window will draw to
IntPtr windowDC = Win32.GetDC(this.Handle); //Window DC that we are going to copy
IntPtr memDC = Win32.CreateCompatibleDC(windowDC); //Temporary DC that we draw to
IntPtr BmpMask = Win32.CreateBitmap(this.ClientSize.Width,
this.ClientSize.Height, 1, 1, IntPtr.Zero); //Mask bitmap so that we only draw areas of the form that are visible
Bitmap backImage = m_useBackgroundEx ? m_backgroundFull : m_background;
IntPtr BmpBack = backImage.GetHbitmap(Color.FromArgb(0)); //Background Image
//Create mask
Win32.SelectObject(memDC, BmpMask);
uint oldCol = Win32.SetBkColor(windowDC, 0x00FF00FF);
Win32.BitBlt(memDC, 0, 0, this.ClientSize.Width, this.ClientSize.Height, windowDC, 0, 0, Win32.TernaryRasterOperations.SRCCOPY);
Win32.SetBkColor(windowDC, oldCol);
//Blit window to background image using mask
//We need to use the SPno raster operation with a white brush to combine our window
//with a black backround before putting it onto the 32-bit background image, otherwise
//we end up with blending issues (source and destination colours are ANDed together)
Win32.SelectObject(memDC, BmpBack);
IntPtr brush = Win32.CreateSolidBrush(0x00FFFFFF);
Win32.SelectObject(memDC, brush);
Win32.MaskBlt(memDC, 0, 0, backImage.Width, backImage.Height, windowDC, 0, 0, BmpMask, 0, 0, 0xCFAA0020);
//Win32.BitBlt(memDC, 0, 0, backImage.Width, backImage.Height, windowDC, m_offX, m_offY, Win32.TernaryRasterOperations.SRCCOPY);
Point zero = new Point(0, 0);
Size size = m_layeredWnd.LayeredSize;
Point pos = m_layeredWnd.LayeredPos;
Win32.BLENDFUNCTION blend = new Win32.BLENDFUNCTION();
blend.AlphaFormat = (byte)Win32.BlendOps.AC_SRC_ALPHA;
blend.BlendFlags = (byte)Win32.BlendFlags.None;
blend.BlendOp = (byte)Win32.BlendOps.AC_SRC_OVER;
blend.SourceConstantAlpha = (byte)(this.Opacity * 255);
Win32.UpdateLayeredWindow(m_layeredWnd.Handle, hdcScreen, ref pos, ref size, memDC, ref zero, 0, ref blend, Win32.BlendFlags.ULW_ALPHA);
//Clean up
Win32.ReleaseDC(IntPtr.Zero, hdcScreen);
Win32.ReleaseDC(this.Handle, windowDC);
Win32.DeleteDC(memDC);
Win32.DeleteObject(brush);
Win32.DeleteObject(BmpMask);
Win32.DeleteObject(BmpBack);
//Hide controls that are visible
this.SuspendLayout();
foreach (Control ctrl in this.Controls)
{
if (ctrl.Visible)
{
m_hiddenControls.Add(ctrl);
ctrl.Visible = false;
}
}
this.ResumeLayout();
}
//If we do not release the mouse then Windows will not start dragging the form, also
//it will mess up mouse input to any border on our form and other windows on the desktop
Win32.ReleaseCapture();
Win32.SendMessage(this.Handle, (int)Win32.Message.WM_NCLBUTTONDOWN, (int)Win32.Message.HTCAPTION, 0);
}
break;
case Win32.Message.WM_SIZE:
{
//The updateLayeredSize function will check the width and height
//we pass in, so we don't need to worry about updating the window
//with the same size it already had
int width = m.LParam.ToInt32() & 0xFFFF;
int height = m.LParam.ToInt32() >> 16;
this.updateLayeredSize(width, height);
}
break;
case Win32.Message.WM_WINDOWPOSCHANGING:
{
Win32.WINDOWPOS posInfo = (Win32.WINDOWPOS)Marshal.PtrToStructure(m.LParam, typeof(Win32.WINDOWPOS));
//We will cancel this movement, and send our own messages to position both forms
//this way we can ensure that both forms are moved together and that
//the Z order is unchanged.
Win32.WindowPosFlags move_size = Win32.WindowPosFlags.SWP_NOMOVE | Win32.WindowPosFlags.SWP_NOSIZE;
if ((posInfo.flags & move_size) != move_size)
{
//Check for my own messages, which I do by setting to hwndInsertAfter to our
//own window, which from what I can gather only happens when you resize your
//window, never when you move it
if (posInfo.hwndInsertAfter != this.Handle)
{
IntPtr hwdp = Win32.BeginDeferWindowPos(2);
if (hwdp != IntPtr.Zero)
{
hwdp = Win32.DeferWindowPos(hwdp, m_layeredWnd.Handle, this.Handle, posInfo.x + m_offX, posInfo.y + m_offY,
0, 0, (uint)(posInfo.flags | Win32.WindowPosFlags.SWP_NOSIZE | Win32.WindowPosFlags.SWP_NOZORDER));
}
if (hwdp != IntPtr.Zero)
{
hwdp = Win32.DeferWindowPos(hwdp, this.Handle, this.Handle, posInfo.x, posInfo.y, posInfo.cx, posInfo.cy,
(uint)(posInfo.flags | Win32.WindowPosFlags.SWP_NOZORDER));
}
if (hwdp != IntPtr.Zero)
{
Win32.EndDeferWindowPos(hwdp);
}
m_layeredWnd.LayeredPos = new Point(posInfo.x + m_offX, posInfo.y + m_offY);
//Update the flags so that the form will not move with this message
posInfo.flags |= Win32.WindowPosFlags.SWP_NOMOVE;
Marshal.StructureToPtr(posInfo, m.LParam, true);
}
if ((posInfo.flags & Win32.WindowPosFlags.SWP_NOSIZE) == 0)
{
//Form was also resized
int diffX = posInfo.cx - this.Size.Width;
int diffY = posInfo.cy - this.Size.Height;
if (diffX != 0 || diffY != 0)
{
this.updateLayeredSize(this.ClientSize.Width + diffX, this.ClientSize.Height + diffY);
}
}
UseBase = false;
}
}
break;
case Win32.Message.WM_ACTIVATE:
{
//If WParam is Zero then the form is deactivating and we don't need to do anything
//Otherwise we need to make sure that the background form is positioned just behind
//the main form.
if (m.WParam != IntPtr.Zero)
{
//Check for any visible windows between the background and main windows
IntPtr prevWnd = Win32.GetWindow(m_layeredWnd.Handle, Win32.GetWindow_Cmd.GW_HWNDPREV);
while (prevWnd != IntPtr.Zero)
{
//If we find a visiable window, we stop
if (Win32.IsWindowVisible(prevWnd))
{
break;
}
prevWnd = Win32.GetWindow(prevWnd, Win32.GetWindow_Cmd.GW_HWNDPREV);
}
//If the visible window isn't ours reset the position of the background form
if (prevWnd != this.Handle)
{
Win32.SetWindowPos(m_layeredWnd.Handle, this.Handle, 0, 0, 0, 0, (uint)(Win32.WindowPosFlags.SWP_NOSENDCHANGING | Win32.WindowPosFlags.SWP_NOACTIVATE | Win32.WindowPosFlags.SWP_NOSIZE | Win32.WindowPosFlags.SWP_NOMOVE));
}
}
}
break;
}
if (UseBase)
{
base.WndProc(ref m);
}
}
protected override void WndProc(ref Message m)
{
if (this.DesignMode)
{
base.WndProc(ref m);
return;
}
Win32.Message msgId = (Win32.Message)m.Msg;
bool UseBase = true;
switch (msgId)
{
case Win32.Message.WM_LBUTTONUP:
{
if (Win32.GetCapture() != IntPtr.Zero)
{
Win32.ReleaseCapture();
}
}
break;
case Win32.Message.WM_ENTERSIZEMOVE:
{
}
break;
case Win32.Message.WM_EXITSIZEMOVE:
{
m_isDown.Left = false;
m_moving = false;
if (m_enhanced)
{
this.SuspendLayout();
foreach (Control ctrl in m_hiddenControls)
{
ctrl.Visible = true;
}
m_hiddenControls.Clear();
this.ResumeLayout();
updateLayeredBackground(this.ClientSize.Width, this.ClientSize.Height, m_layeredWnd.LayeredPos, false);
}
}
break;
case Win32.Message.WM_MOUSEMOVE:
if (Win32.GetCapture() != IntPtr.Zero && m_moving)
{
if (m_enhanced)
{
IntPtr hdcScreen = Win32.GetWindowDC(m_layeredWnd.Handle);
IntPtr windowDC = Win32.GetDC(this.Handle);
IntPtr memDC = Win32.CreateCompatibleDC(windowDC);
IntPtr BmpMask = Win32.CreateBitmap(this.ClientSize.Width,
this.ClientSize.Height, 1, 1, IntPtr.Zero);
Bitmap backImage = m_useBackgroundEx ? m_backgroundFull : m_background;
IntPtr BmpBack = backImage.GetHbitmap(Color.FromArgb(0));
Win32.SelectObject(memDC, BmpMask);
uint oldCol = Win32.SetBkColor(windowDC, 0x00FF00FF);
Win32.BitBlt(memDC, 0, 0, this.ClientSize.Width, this.ClientSize.Height, windowDC, 0, 0, Win32.TernaryRasterOperations.SRCCOPY);
Win32.SetBkColor(windowDC, oldCol);
Win32.SelectObject(memDC, BmpBack);
IntPtr brush = Win32.CreateSolidBrush(0x00FFFFFF);
Win32.SelectObject(memDC, brush);
Win32.MaskBlt(memDC, 0, 0, backImage.Width, backImage.Height, windowDC, 0, 0, BmpMask, 0, 0, 0xCFAA0020);
Point zero = new Point(0, 0);
Size size = m_layeredWnd.LayeredSize;
Point pos = m_layeredWnd.LayeredPos;
Win32.BLENDFUNCTION blend = new Win32.BLENDFUNCTION();
blend.AlphaFormat = (byte)Win32.BlendOps.AC_SRC_ALPHA;
blend.BlendFlags = (byte)Win32.BlendFlags.None;
blend.BlendOp = (byte)Win32.BlendOps.AC_SRC_OVER;
blend.SourceConstantAlpha = (byte)(this.Opacity * 255);
Win32.UpdateLayeredWindow(m_layeredWnd.Handle, hdcScreen, ref pos, ref size, memDC, ref zero, 0, ref blend, Win32.BlendFlags.ULW_ALPHA);
Win32.ReleaseDC(IntPtr.Zero, hdcScreen);
Win32.ReleaseDC(this.Handle, windowDC);
Win32.DeleteDC(memDC);
Win32.DeleteObject(brush);
Win32.DeleteObject(BmpMask);
Win32.DeleteObject(BmpBack);
this.SuspendLayout();
foreach (Control ctrl in this.Controls)
{
if (ctrl.Visible)
{
m_hiddenControls.Add(ctrl);
ctrl.Visible = false;
}
}
this.ResumeLayout();
}
Win32.ReleaseCapture();
Win32.SendMessage(this.Handle, (int)Win32.Message.WM_NCLBUTTONDOWN, (int)Win32.Message.HTCAPTION, 0);
}
break;
case Win32.Message.WM_SIZE:
{
int width = m.LParam.ToInt32() & 0xFFFF;
int height = m.LParam.ToInt32() >> 16;
this.updateLayeredSize(width, height);
}
break;
case Win32.Message.WM_WINDOWPOSCHANGING:
{
Win32.WINDOWPOS posInfo = (Win32.WINDOWPOS)Marshal.PtrToStructure(m.LParam, typeof(Win32.WINDOWPOS));
Win32.WindowPosFlags move_size = Win32.WindowPosFlags.SWP_NOMOVE | Win32.WindowPosFlags.SWP_NOSIZE;
if ((posInfo.flags & move_size) != move_size)
{
if (posInfo.hwndInsertAfter != this.Handle)
{
IntPtr hwdp = Win32.BeginDeferWindowPos(2);
if (hwdp != IntPtr.Zero)
{
hwdp = Win32.DeferWindowPos(hwdp, m_layeredWnd.Handle, this.Handle, posInfo.x + m_offX, posInfo.y + m_offY,
0, 0, (uint)(posInfo.flags | Win32.WindowPosFlags.SWP_NOSIZE | Win32.WindowPosFlags.SWP_NOZORDER));
}
if (hwdp != IntPtr.Zero)
{
hwdp = Win32.DeferWindowPos(hwdp, this.Handle, this.Handle, posInfo.x, posInfo.y, posInfo.cx, posInfo.cy,
(uint)(posInfo.flags | Win32.WindowPosFlags.SWP_NOZORDER));
}
if (hwdp != IntPtr.Zero)
{
Win32.EndDeferWindowPos(hwdp);
}
m_layeredWnd.LayeredPos = new Point(posInfo.x + m_offX, posInfo.y + m_offY);
posInfo.flags |= Win32.WindowPosFlags.SWP_NOMOVE;
Marshal.StructureToPtr(posInfo, m.LParam, true);
}
if ((posInfo.flags & Win32.WindowPosFlags.SWP_NOSIZE) == 0)
{
int diffX = posInfo.cx - this.Size.Width;
int diffY = posInfo.cy - this.Size.Height;
if (diffX != 0 || diffY != 0)
{
this.updateLayeredSize(this.ClientSize.Width + diffX, this.ClientSize.Height + diffY);
}
}
UseBase = false;
}
}
break;
case Win32.Message.WM_ACTIVATE:
{
if (m.WParam != IntPtr.Zero)
{
IntPtr prevWnd = Win32.GetWindow(m_layeredWnd.Handle, Win32.GetWindow_Cmd.GW_HWNDPREV);
while (prevWnd != IntPtr.Zero)
{
if (Win32.IsWindowVisible(prevWnd))
{
break;
}
prevWnd = Win32.GetWindow(prevWnd, Win32.GetWindow_Cmd.GW_HWNDPREV);
}
if (prevWnd != this.Handle)
{
Win32.SetWindowPos(m_layeredWnd.Handle, this.Handle, 0, 0, 0, 0, (uint)(Win32.WindowPosFlags.SWP_NOSENDCHANGING | Win32.WindowPosFlags.SWP_NOACTIVATE | Win32.WindowPosFlags.SWP_NOSIZE | Win32.WindowPosFlags.SWP_NOMOVE));
}
}
}
break;
}
if (UseBase)
{
base.WndProc(ref m);
}
}
