/// <summary>Occurs when a Windows message is dispatched.</summary>
/// <param name="message">Message to process.</param>
/// <remarks>Overrides WM_PAINT, WM_ERASEBKGND.</remarks>
protected override void WndProc(ref Message message)
{
const int WM_PAINT = 0x000F;
const int WM_PRINTCLIENT = 0x0318;
const int WM_ERASEBKGND = 0x0014;
switch (message.Msg)
{
case WM_ERASEBKGND:
//removes flicker
return;
case WM_PAINT:
// The designer host does not call OnResize()
if (internalGraphics == null)
{
OnResize(EventArgs.Empty);
}
//Set up
Win32.RECT updateRect = new Win32.RECT();
if (Win32.GetUpdateRect(message.HWnd, ref updateRect, false) == 0)
{
break;
}
Win32.PAINTSTRUCT paintStruct = new Win32.PAINTSTRUCT();
IntPtr screenHdc = Win32.BeginPaint(message.HWnd, ref paintStruct);
using (Graphics screenGraphics = Graphics.FromHdc(screenHdc))
{
//Draw Internal Graphics
IntPtr hdc = internalGraphics.GetHdc();
Message printClientMessage = Message.Create(Handle, WM_PRINTCLIENT, hdc, IntPtr.Zero);
DefWndProc(ref printClientMessage);
internalGraphics.ReleaseHdc(hdc);
//Add the missing OnPaint() call
OnPaint(new PaintEventArgs(internalGraphics, Rectangle.FromLTRB(
updateRect.left,
updateRect.top,
updateRect.right,
updateRect.bottom)));
//Draw Screen Graphics
screenGraphics.DrawImage(internalBitmap, 0, 0);
}
//Tear down
Win32.EndPaint(message.HWnd, ref paintStruct);
return;
}
base.WndProc(ref message);
}
/// <summary>Occurs when a Windows message is dispatched.</summary>
/// <param name="message">Message to process.</param>
/// <remarks>Overrides WM_PAINT, WM_ERASEBKGND.</remarks>
protected override void WndProc(ref Message message)
{
const int WM_PAINT = 0x000F;
const int WM_PRINTCLIENT = 0x0318;
const int WM_ERASEBKGND = 0x0014;
switch (message.Msg)
{
case WM_ERASEBKGND:
//removes flicker
return;
case WM_PAINT:
// The designer host does not call OnResize()
if (internalGraphics == null)
OnResize(EventArgs.Empty);
//Set up
Win32.RECT updateRect = new Win32.RECT();
if (Win32.GetUpdateRect(message.HWnd, ref updateRect, false) == 0)
break;
Win32.PAINTSTRUCT paintStruct = new Win32.PAINTSTRUCT();
IntPtr screenHdc = Win32.BeginPaint(message.HWnd, ref paintStruct);
using (Graphics screenGraphics = Graphics.FromHdc(screenHdc))
{
//Draw Internal Graphics
IntPtr hdc = internalGraphics.GetHdc();
Message printClientMessage = Message.Create(Handle, WM_PRINTCLIENT, hdc, IntPtr.Zero);
DefWndProc(ref printClientMessage);
internalGraphics.ReleaseHdc(hdc);
//Add the missing OnPaint() call
OnPaint(new PaintEventArgs(internalGraphics, Rectangle.FromLTRB(
updateRect.left,
updateRect.top,
updateRect.right,
updateRect.bottom)));
//Draw Screen Graphics
screenGraphics.DrawImage(internalBitmap, 0, 0);
}
//Tear down
Win32.EndPaint(message.HWnd, ref paintStruct);
return;
}
base.WndProc(ref message);
}