// $Id: x11util.cpp,v 1.4 2009/07/03 00:36:20 hpereira Exp $

/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This software is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* software; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA  02111-1307 USA
*
*
*******************************************************************************/

/*!
  \file    X11Util.h
  \brief   some X11 specific utilities
  \author  Hugo Pereira
  \version $Revision: 1.4 $
  \date    $Date: 2009/07/03 00:36:20 $
*/

#include "x11util.h"
 
using namespace std;

namespace Nitrogen
{
  
  //________________________________________________________________________
  X11Util& X11Util::get( void )
  {
    static X11Util singleton;
    return singleton;
  }
  
  //________________________________________________________________________
  X11Util::X11Util( void )
  { 
    _initializeAtomNames();
  }
  
  //________________________________________________________________________
  bool X11Util::isSupported( const Atoms& atom )
  {
    
    #ifdef Q_WS_X11
    
    SupportedAtomMap::const_iterator iter( _supportedAtoms().find( atom ) );
    if( iter != _supportedAtoms().end() ) return iter->second;
    
    Display* display( QX11Info::display() );
    Atom net_supported( findAtom( _NET_SUPPORTED ) );
    Atom searched( findAtom( atom ) );
    
    Atom actual;
    int format;
    unsigned char *data;
    unsigned long offset = 0;
    
    while( 1 )
    {
      unsigned long n, left;
      XGetWindowProperty( display, QX11Info::appRootWindow(),
        net_supported, offset, 1L,
        false, XA_ATOM, &actual,  
        &format, &n, &left, 
        (unsigned char **) &data);
      
      if( data == None ) break;      
      
      // try cast data to atom
      Atom found( *(Atom*)data );
      
      if( found == searched ) 
      {
        supported_atoms_[atom] = true;
        return true;
      }
      
      if( !left ) break;
      else offset ++;
      
    }
    
    supported_atoms_[atom] = false;
    
    #endif
    
    return false;
    
  }
  
  //________________________________________________________________________
  bool X11Util::moveResizeWidget( 
    WId id, 
    int screen,
    QPoint position, 
    X11Util::Direction direction, 
    Qt::MouseButton button )
  {
        
    #ifdef Q_WS_X11
    
    // check
    if( !isSupported( _NET_WM_MOVERESIZE ) ) return false;
    
    Display* display( QX11Info::display() );
    Atom net_wm_moveresize( findAtom( _NET_WM_MOVERESIZE ) );   
    
    XEvent event;
    event.xclient.type = ClientMessage;
    event.xclient.message_type = net_wm_moveresize;
    event.xclient.display = display;
    event.xclient.window = id;
    event.xclient.format = 32;
    event.xclient.data.l[0] = position.x();
    event.xclient.data.l[1] = position.y();
    event.xclient.data.l[2] = direction; 
    event.xclient.data.l[3] = button;
    event.xclient.data.l[4] = 0;
    XUngrabPointer( display, QX11Info::appTime() );
    XSendEvent(display, 
      QX11Info::appRootWindow( screen ), 
      false,
      SubstructureRedirectMask | SubstructureNotifyMask, &event);
    return true;
    
    #else
    return false;
    #endif
  }
  
  //________________________________________________________________________
  void X11Util::_initializeAtomNames( void )
  {
    
    atom_names_[_NET_SUPPORTED] = "_NET_SUPPORTED";
    atom_names_[_NET_WM_STATE] = "_NET_WM_STATE";
    atom_names_[_NET_WM_MOVERESIZE] = "_NET_WM_MOVERESIZE";
    
    return;
  }
  
  #ifdef Q_WS_X11
  
  //________________________________________________________________________
  Atom X11Util::findAtom( const Atoms& atom )
  {
    
    // find atom in map
    AtomMap::iterator iter( _atoms().find( atom ) );
    if( iter != _atoms().end() ) return iter->second;
    
    // create atom if not found
    Display* display( QX11Info::display() );
    Atom out( XInternAtom(display, qPrintable( atom_names_[atom] ), false ) );
    atoms_[atom] = out;
    return out;
    
  }

}

#endif