private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
RECT rect;
switch ((WM)msg)
{
case WM.SHOWWINDOW:
if ((int)lParam == 3 && this.Visibility != Visibility.Visible) // 3 == SW_PARENTOPENING
{
handled = true; //handle this message so window isn't shown until we want it to
}
break;
case WM.MOUSEACTIVATE:
handled = true;
if (this.ownerHandle != IntPtr.Zero)
{
Standard.NativeMethods.SendMessage(this.ownerHandle, Standard.WM.ACTIVATE, wParam, lParam);
}
return(new IntPtr(3));
case WM.LBUTTONDOWN:
if (this.ownerHandle != IntPtr.Zero && UnsafeNativeMethods.GetWindowRect(this.ownerHandle, out rect))
{
Point pt;
if (WinApiHelper.TryGetRelativeMousePosition(this.handle, out pt))
{
NativeMethods.PostMessage(this.ownerHandle, (uint)WM.NCLBUTTONDOWN, (IntPtr)this.getHitTestValue(pt, rect), IntPtr.Zero);
}
}
break;
case WM.NCHITTEST:
Cursor cursor = null;
if (this._owner.ResizeMode == ResizeMode.NoResize || this._owner.ResizeMode == ResizeMode.CanMinimize)
{
cursor = this._owner.Cursor;
}
else
{
if (this.ownerHandle != IntPtr.Zero && UnsafeNativeMethods.GetWindowRect(this.ownerHandle, out rect))
{
Point pt;
if (WinApiHelper.TryGetRelativeMousePosition(this.handle, out pt))
{
cursor = this.getCursor(pt, rect);
}
}
}
if (cursor != null && cursor != this.Cursor)
{
this.Cursor = cursor;
}
break;
}
return(IntPtr.Zero);
}
/// <summary>
/// Gets the relative mouse position to the given handle in client coordinates.
/// </summary>
/// <param name="hWnd">The handle for this method.</param>
public static System.Windows.Point GetRelativeMousePosition(IntPtr hWnd)
{
if (hWnd == IntPtr.Zero)
{
return(new System.Windows.Point());
}
var point = WinApiHelper.GetPhysicalCursorPos();
NativeMethods.ScreenToClient(hWnd, ref point);
return(new System.Windows.Point(point.X, point.Y));
}