RE: [ROOT] Canvas question

From: Faine, Valeri (fine@bnl.gov)
Date: Sun Mar 03 2002 - 00:47:58 MET 

Hello Dimitris

Since TCanvasImp has no generic method to do what you want you should apply
either WIN32 
or Qt API (for Qt version).

To change the Window appearance under Windows one may apply

LONG SetWindowLong(
  HWND hWnd,       // handle to window
  int nIndex,      // offset of value to set
  LONG dwNewLong   // new value
);


or (if you want to change things for all windows at once)
 
DWORD SetClassLong(
  HWND hWnd,       // handle to window
  int nIndex,      // index of value to change
  LONG dwNewLong   // new value
);

WIN32 API. You should consult your "Developer Studio help" to choose the
proper 
values for "nIndex" and "dwNewLong"
 
With 
http://www.usatlas.bnl.gov/~fine/QtRoot/QtRoot.html
under Windows you can access "Window handle" of the TCanvas
http://www.usatlas.bnl.gov/~fine/QtRoot/QtRoot.html#win32

or may use "cross-platform" Qt API:
http://www.usatlas.bnl.gov/~fine/QtRoot/QtRoot.html#qt
(see: http://doc.trolltech.com/3.0/qt.html#WidgetFlags-enum
look for Qt::WStyle_Title, Qt::WStyle_MinMax  flags there )


For the current WIN32 API the following function should make the job:
//______________________________________
HWND GetWindowHandle(TCanvas *c)
{
  HWND hwnd = NULL:
  if (c) {
    TCanvasImp *imp = c->GetCanvasImp();
    if (imp) {
      TGWin32Object *win32Obj = ((TWin32Canvas *)imp)->GetWin32Obj();
      if (win32Obj) {
       hwnd = ((TGWin32WindowsObject *)win32Obj)->GetWindow();
      }
    }
  }
  return hwnd;
}

You may want to protect the casting above with "dynamic_cast"
(and provide the include files of course)

 My best regards, Valeri
 

-----Original Message-----
From: Dimitris Sideris
To: roottalk@pcroot.cern.ch
Sent: 2/28/02 9:43 AM
Subject: [ROOT] Canvas question

Dear Rooters, 
 
I want to remove the titlebar including the close/minimize buttons from
a canvas window in win 2000.
What is the simplest way to do this? 
 
Thanks
 
Dimitris Sideris

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