static extern IntPtr CallWindowProc(IntPtr lpPrevWndFunc, IntPtr hWnd, PInvoke.User32.WindowMessage Msg, IntPtr wParam, IntPtr lParam);
private IntPtr NewWindowProc(IntPtr hWnd, PInvoke.User32.WindowMessage Msg, IntPtr wParam, IntPtr lParam)
{
switch (Msg)
{
case PInvoke.User32.WindowMessage.WM_GETMINMAXINFO:
MINMAXINFO minMaxInfo = Marshal.PtrToStructure <MINMAXINFO>(lParam);
minMaxInfo.ptMinTrackSize.x = DisplayInformation.ConvertEpxToPixel(hWnd, MinWidth);
minMaxInfo.ptMinTrackSize.y = DisplayInformation.ConvertEpxToPixel(hWnd, MinHeight);
minMaxInfo.ptMaxTrackSize.x = DisplayInformation.ConvertEpxToPixel(hWnd, MaxWidth);
minMaxInfo.ptMaxTrackSize.y = DisplayInformation.ConvertEpxToPixel(hWnd, MaxHeight);
Marshal.StructureToPtr(minMaxInfo, lParam, true);
break;
case PInvoke.User32.WindowMessage.WM_CLOSE:
//If there is a Closing event handler and the close message wasn't send via
//this event (that set IsClosing=true), the message is ignored.
if (this.Closing is not null)
{
if (IsClosing == false)
{
OnClosing();
}
return(IntPtr.Zero);
}
break;
case PInvoke.User32.WindowMessage.WM_MOVE:
if (this.Moving is not null)
{
OnWindowMoving();
}
break;
case PInvoke.User32.WindowMessage.WM_SIZING:
if (this.Sizing is not null)
{
OnWindowSizing();
}
break;
case PInvoke.User32.WindowMessage.WM_DPICHANGED:
if (this.DpiChanged is not null)
{
//g_dpi = HIWORD(wParam);
uint dpi = HiWord(wParam);
OnWindowDpiChanged((int)dpi);
}
break;
case PInvoke.User32.WindowMessage.WM_DISPLAYCHANGE:
if (this.OrientationChanged is not null)
{
var newOrinetation = GetWindowOrientationWin32(hWnd);
if (newOrinetation != _currentOrientation)
{
_currentOrientation = newOrinetation;
OnWindowOrientationChanged(newOrinetation);
}
}
break;
}
return(CallWindowProc(oldWndProc, hWnd, Msg, wParam, lParam));
}
public static extern bool ChangeWindowMessageFilterEx(IntPtr hWnd, PInvoke.User32.WindowMessage msg, ChangeWindowMessageFilterExAction action, ref CHANGEFILTERSTRUCT changeInfo);
