workspace/khotkeys/kcontrol/windowselector.cpp

   1 /****************************************************************************
   2
   3  KHotKeys
   4
   5  Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>
   6
   7  Distributed under the terms of the GNU General Public License version 2.
   8
   9 ****************************************************************************/
  10
  11 #define _WINDOWSELECTOR_CPP_
  12
  13
  14
  15 #include "windowselector.h"
  16
  17 #include <QCursor>
  18 #include "voices.h"
  19
  20 #include <kdebug.h>
  21 #include <kapplication.h>
  22 #include <X11/Xlib.h>
  23 #include <QDesktopWidget>
  24 #include <QX11Info>
  25 #include <fixx11h.h>
  26
  27 namespace KHotKeys
  28 {
  29
  30 WindowSelector::WindowSelector( QObject* receiver_P, const char* slot_P )
  31     {
  32     connect( this, SIGNAL( selected_signal( WId )), receiver_P, slot_P );
  33     }
  34
  35 void WindowSelector::select()
  36     {
  37     kapp->desktop()->grabMouse( QCursor( Qt::CrossCursor ));
  38     kapp->installX11EventFilter( this );
  39     }
  40
  41 bool WindowSelector::x11Event( XEvent* e )
  42     {
  43     if( e->type != ButtonPress )
  44         return false;
  45     kapp->desktop()->releaseMouse();
  46     if( e->xbutton.button == Button1 )
  47         {
  48         WId window = findRealWindow( e->xbutton.subwindow );
  49         if( window )
  50             selected_signal( window );
  51         }
  52     delete this;
  53     return true;
  54     }
  55
  56 WId WindowSelector::findRealWindow( WId w, int depth )
  57     {
  58     if( depth > 5 )
  59         return None;
  60     static Atom wm_state = XInternAtom( QX11Info::display(), "WM_STATE", False );
  61     Atom type;
  62     int format;
  63     unsigned long nitems, after;
  64     unsigned char* prop;
  65     if( XGetWindowProperty( QX11Info::display(), w, wm_state, 0, 0, False, AnyPropertyType,
  66         &type, &format, &nitems, &after, &prop ) == Success )
  67         {
  68         if( prop != NULL )
  69             XFree( prop );
  70         if( type != None )
  71             return w;
  72         }
  73     Window root, parent;
  74     Window* children;
  75     unsigned int nchildren;
  76     Window ret = None;
  77     if( XQueryTree( QX11Info::display(), w, &root, &parent, &children, &nchildren ) != 0 )
  78         {
  79         for( unsigned int i = 0;
  80              i < nchildren && ret == None;
  81              ++i )
  82             ret = findRealWindow( children[ i ], depth + 1 );
  83         if( children != NULL )
  84             XFree( children );
  85         }
  86     return ret;
  87 }
  88
  89
  90 } // namespace KHotKeys
  91
  92 #include "windowselector.moc"