private static IntPtr FixMaximize_RibbonWindow_WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
const int AllowedNegativeOffset = 4;
const int WM_GETMINMAXINFO = 0x0024;
const uint SWP_NOOWNERZORDER = 0x0200;
const uint SWP_NOSIZE = 0x0001;
const int SIZE_MAXIMIZED = 0x2;
const int WM_SIZE = 0x0005;
if (msg == WM_SIZE && wParam.ToInt32() == SIZE_MAXIMIZED)
{
var rect = new RECT();
GetWindowRect(hwnd, out rect);
var newRect = new RECT();
var xDiff = (rect.left < 0) ? rect.left * -1 : 0;
var yDiff = (rect.top < 0) ? rect.top * -1 : 0;
// we need to go from (de)fault (-8,-8) to (-4,-4) we are currently at (1,1)
newRect.left = rect.left + xDiff - 1 - AllowedNegativeOffset;
newRect.right = newRect.left + Math.Abs(rect.right - rect.left);
newRect.top = rect.top + yDiff - 1 - AllowedNegativeOffset;
newRect.bottom = newRect.top + Math.Abs(rect.bottom - rect.top);
// Step 1: resize so we have the right size the first time
int height = newRect.bottom - newRect.top;
int width = newRect.right - newRect.left;
var window = (Window)HwndSource.FromHwnd(hwnd).RootVisual;
var windowSize = GetWindowSize(hwnd);
height = (height > (int)windowSize.Height) ? (int)windowSize.Height : 0;
width = (width > (int)windowSize.Width) ? (int)windowSize.Width : 0;
if (height != 0 || width != 0)
{
height = (int)windowSize.Height;
width = (int)windowSize.Width;
window.Dispatcher.BeginInvoke(() => SetWindowPos(hwnd, IntPtr.Zero, newRect.left, newRect.top, width, height, SWP_NOOWNERZORDER));
}
// Step 2: fix the location, use dispatcher to make sure this code also works the first time an application
// is started in Maximize state
window.Dispatcher.BeginInvoke(() => SetWindowPos(hwnd, IntPtr.Zero, newRect.left, newRect.top, 0, 0, SWP_NOOWNERZORDER | SWP_NOSIZE));
}
else if (msg == WM_GETMINMAXINFO)
{
var mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
//mmi.ptMaxSize.x -= 8; // we are missing 4 pixels left and right
//mmi.ptMaxSize.y -= 8; // we are missing 4 pixels top and bottom
mmi.ptMaxPosition.x = 1; // need to set this to positive value for MaxSize to have any effect, we will reposition later anyway
mmi.ptMaxPosition.y = 1; // need to set this to positive value for MaxSize to have any effect, we will reposition later anyway
var windowSize = GetWindowSize(hwnd);
mmi.ptMaxSize.x = (int)windowSize.Width;
mmi.ptMaxSize.y = (int)windowSize.Height;
mmi.ptMinTrackSize.x = mmi.ptMaxSize.x;
mmi.ptMinTrackSize.x = mmi.ptMaxSize.y;
Marshal.StructureToPtr(mmi, lParam, false);
}
return IntPtr.Zero;
}
public static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);
