kdecore Library API Documentation

kipc.cpp

00001 /* This file is part of the KDE libraries
00002 
00003    Copyright (C) 1999 Mattias Ettrich (ettrich@kde.org)
00004    Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
00005 
00006    This library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Library General Public
00008    License as published by the Free Software Foundation; either
00009    version 2 of the License, or (at your option) any later version.
00010 
00011    This library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Library General Public License for more details.
00015 
00016    You should have received a copy of the GNU Library General Public License
00017    along with this library; see the file COPYING.LIB.  If not, write to
00018    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00019    Boston, MA 02111-1307, USA.
00020 */
00021 
00022 
00023 /*
00024  * kipc.cpp: Send a message to one/all KDE apps.
00025  *
00026  * $Id: kipc.cpp,v 1.11 2001/08/29 15:25:38 bero Exp $
00027  */
00028 
00029 #include <qwindowdefs.h>
00030 
00031 #ifdef Q_WS_X11
00032 #include <X11/X.h>
00033 #include <X11/Xlib.h>
00034 #endif
00035 
00036 #include <kipc.h>
00037 
00038 
00039 #ifndef Q_WS_QWS
00040 static int dropError(Display *, XErrorEvent *)
00041 {
00042     return 0;
00043 }
00044 
00045 static long getSimpleProperty(Window w, Atom a)
00046 {
00047     Atom real_type;
00048     int format;
00049     unsigned long n, extra, *p = 0, res;
00050     int status;
00051 
00052     res = 0;
00053     status = XGetWindowProperty(qt_xdisplay(), w, a, 0L, 1L, False, a,
00054             &real_type, &format, &n, &extra, (unsigned char **) &p);
00055     if ((status == Success) && (n == 1) && (format == 32))
00056     res = p[0];
00057     if (p) XFree((char *) p);
00058     return res;
00059 }
00060 
00061 
00062 void KIPC::sendMessage(Message msg, WId w, int data)
00063 {
00064     static Atom a = 0;
00065     if (a == 0)
00066     a = XInternAtom(qt_xdisplay(), "KIPC_COMM_ATOM", False);
00067     XEvent ev;
00068     ev.xclient.type = ClientMessage;
00069     ev.xclient.display = qt_xdisplay();
00070     ev.xclient.window = (Window) w;
00071     ev.xclient.message_type = a;
00072     ev.xclient.format = 32;
00073     ev.xclient.data.l[0] = msg;
00074     ev.xclient.data.l[1] = data;
00075     XSendEvent(qt_xdisplay(), (Window) w, False, 0L, &ev);
00076 
00077     // KDE 1 support
00078     static Atom kde1 = 0;
00079     if ( msg == PaletteChanged || msg == FontChanged ) {
00080     if ( kde1 == 0 )
00081         kde1 = XInternAtom(qt_xdisplay(), "KDEChangeGeneral", False );
00082     ev.xclient.message_type = kde1;
00083     XSendEvent(qt_xdisplay(), (Window) w, False, 0L, &ev);
00084     }
00085 
00086 }
00087 
00088 
00089 void KIPC::sendMessageAll(Message msg, int data)
00090 {
00091     unsigned int i, nrootwins;
00092     Window dw1, dw2, *rootwins = 0;
00093     int (*defaultHandler)(Display *, XErrorEvent *);
00094     Display *dpy = qt_xdisplay();
00095     int screen_count = ScreenCount(dpy);
00096 
00097     defaultHandler = XSetErrorHandler(&dropError);
00098 
00099     for (int s = 0; s < screen_count; s++) {
00100     Window root = RootWindow(dpy, s);
00101 
00102     XQueryTree(dpy, root, &dw1, &dw2, &rootwins, &nrootwins);
00103     Atom a = XInternAtom(qt_xdisplay(), "KDE_DESKTOP_WINDOW", False);
00104     for (i = 0; i < nrootwins; i++)
00105         {
00106         if (getSimpleProperty(rootwins[i], a) != 0L)
00107             sendMessage(msg, rootwins[i], data);
00108         }
00109     }
00110 
00111     XFlush(dpy);
00112     XSetErrorHandler(defaultHandler);
00113     XFree((char *) rootwins);
00114 }
00115 #else
00116     // FIXME(E): Implement in Qt Embedded
00117 #endif
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This file is part of the documentation for kdelibs Version 3.1.0.
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