/* 
 * Copyright (c) 2003 Lubos Lunak <l.lunak@kde.org>
 *
 *  This program 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 program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "krandrpassivepopup.h"

#include <kapplication.h>
#include <QtGui/qx11info_x11.h>
#include <QPixmap>
#include <QEvent>

// this class is just like KPassivePopup, but it keeps track of the widget
// it's supposed to be positioned next to, and adjust its position if that
// widgets moves (needed because after a resolution switch Kicker will
// reposition itself, causing normal KPassivePopup to stay at weird places)

KRandrPassivePopup::KRandrPassivePopup(QWidget *parent, Qt::WFlags f)
    : KPassivePopup(parent, f)
{
    update_timer.setSingleShot( true );
    connect( &update_timer, SIGNAL(timeout()), SLOT(slotPositionSelf()));
}
    
KRandrPassivePopup* KRandrPassivePopup::message(const QString &caption, const QString &text,
                                                const QPixmap &icon, QWidget *parent, int timeout)
{
    KRandrPassivePopup *pop = new KRandrPassivePopup(parent);
    pop->setAutoDelete(true);
    pop->setView(caption, text, icon);
    pop->setTimeout(timeout);
    pop->show();
    pop->startWatchingWidget(parent);
    return pop;
}

void KRandrPassivePopup::startWatchingWidget(QWidget* widget_P)
{
    static Atom wm_state = XInternAtom(QX11Info::display() , "WM_STATE", False);
    Window win = widget_P->winId();
    bool x11_events = false;
    for(;;) {
        Window root, parent;
        Window* children;
        unsigned int nchildren;
        XQueryTree(QX11Info::display(), win, &root, &parent, &children, &nchildren);
        if (children != NULL) {
            XFree(children);
        }
        if (win == root) { // huh?
            break;
        }
        win = parent;
        
        QWidget* widget = QWidget::find(win);
        if (widget != NULL) {
            widget->installEventFilter(this);
            watched_widgets.append(widget);
        } else {
            XWindowAttributes attrs;
            XGetWindowAttributes(QX11Info::display(), win, &attrs);
            XSelectInput(QX11Info::display(), win, attrs.your_event_mask | StructureNotifyMask);
            watched_windows.append(win);
            x11_events = true;
        }
        Atom type;
        int format;
        unsigned long nitems, after;
        unsigned char* data;
        if (XGetWindowProperty( QX11Info::display(), win, wm_state, 0, 0, False, AnyPropertyType,
            &type, &format, &nitems, &after, &data) == Success) {
            if (data != NULL) {
                XFree( data );
            }
            if (type != None) {
                // toplevel window
                break;
            }
        }
    }
    if (x11_events) {
        kapp->installX11EventFilter(this);
    }
}

bool KRandrPassivePopup::eventFilter(QObject* o, QEvent* e)
{
    if (e->type() == QEvent::Move && o->isWidgetType()
        && watched_widgets.contains( static_cast< QWidget* >( o ))) {
        QTimer::singleShot(0, this, SLOT(slotPositionSelf()));
    }
    return false;
}

bool KRandrPassivePopup::x11Event(XEvent* e)
{
    if (e->type == ConfigureNotify && watched_windows.contains(e->xconfigure.window)) {
        if (!update_timer.isActive()) {
            update_timer.start(10);
        }
        return false;
    }
    return KPassivePopup::x11Event(e);
}
        
void KRandrPassivePopup::slotPositionSelf()
{
    positionSelf();
}
    
#include "moc_krandrpassivepopup.cpp"