In the program, how to dynamically remove the non-client area of ​​the dialog box? ? ?

gchocobo

The dialog box has a non-client area during initialization. When a certain condition is met, how to remove the non-client area? ? ? ? Thank you! !!

kk1370

SetWindowRgn

gchocobo

I want to be able to dynamically change the properties of the dialog, that is, change the Border property of the dialog from Resizing to Nono

kk1370

That's not good, as for why, you can try and understand :)

gchocobo

I just don't know how to modify it dynamically?

falconwbgjdl

Try:
DWORD oldstyle = GetWindowLong ();
DWORD newStyle = WS_XXXX; set the style you need
SetWindowLong (olstyle | newstyle);

2511718

Handling WM_NCCALCSIZE messages

void OnNcCalcSize (BOOL bCalcValidRects, NCCALCSIZE_PARAMS * lpncsp)
{
   if (bCalcValidRects)
   {
      int nCYCaption = GetSystemMetrics (SM_CYCAPTION);
      lpncsp-> rgrc [0] .top-= nCYCaption;
   }
   else
   {
      CDialog :: OnNcCalcSize (bCalcValidRects, lpncsp);
   }
}

falconwbgjdl

Or, this method must be successful:
GetClientRect (CRect * rc);
GetWindowRect (CRect * rc);
SetWindowRgn (CRgn * rgn);

2511718

For your convenience you can simply modify the window style

DWORD dwStyle = GetWindowLong (m_hWnd, GWL_STYLE);

dwStyle&= ~ WS_CAPTION;

SetWindowLong (m_hWnd, GWL_STYLE, dwStyle);

gchocobo

Everyone's method is very good, thank you!
After removing the title bar, the form still has a client area and a non-client area (up, down, left, and right have 3 pixels respectively). I want to be able to dynamically change the dialog box to the right attribute, that is, the dialog box Changed the Border property from Resizing to Nono, so I can get the effect I want.