/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtGui module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "qapplication.h"+
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+
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#ifndef QT_NO_DRAGANDDROP+
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+
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#include "qwidget.h"+
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#include "qdatetime.h"+
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#include "qbitmap.h"+
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#include "qcursor.h"+
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#include "qevent.h"+
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#include "qpainter.h"+
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#include "qdnd_p.h"+
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#include "qt_s60_p.h"+
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+
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#include <coecntrl.h>+
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// pointer cursor+
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#include <w32std.h>+
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#include <gdi.h>+
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#include <QCursor>+
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+
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QT_BEGIN_NAMESPACE+
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//### artistic impression of Symbians default DnD cursor ?+
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+
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static QPixmap *defaultPm = 0;+
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static const int default_pm_hotx = -50;+
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static const int default_pm_hoty = -50;+
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static const char *const default_pm[] = {+
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"13 9 3 1",+
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".      c None",+
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"       c #000000",+
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"X      c #FFFFFF",+
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"X X X X X X X",+
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" X X X X X X ",+
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"X ......... X",+
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" X.........X ",+
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"X ......... X",+
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" X.........X ",+
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"X ......... X",+
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" X X X X X X ",+
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"X X X X X X X",+
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};+
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//### actions need to be redefined for S60+
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// Shift/Ctrl handling, and final drop status+
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static Qt::DropAction global_accepted_action = Qt::MoveAction;+
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static Qt::DropActions possible_actions = Qt::IgnoreAction;+
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+
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+
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// static variables in place of a proper cross-process solution+
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static QDrag *drag_object;+
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static bool qt_symbian_dnd_dragging = false;+
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+
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+
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static Qt::KeyboardModifiers oldstate;+
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+
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void QDragManager::updatePixmap()+
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{+
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    QPixmap pm;+
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    QPoint pm_hot(default_pm_hotx,default_pm_hoty);+
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    if (drag_object) {+
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        pm = drag_object->pixmap();+
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        if (!pm.isNull())+
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            pm_hot = drag_object->hotSpot();+
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    }+
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    if (pm.isNull()) {+
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        if (!defaultPm)+
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            defaultPm = new QPixmap(default_pm);+
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        pm = *defaultPm;+
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    }+
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#ifndef QT_NO_CURSOR+
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    QCursor cursor(pm, pm_hot.x(), pm_hot.y());+
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    overrideCursor = cursor;+
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#endif+
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}+
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+
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void QDragManager::timerEvent(QTimerEvent *) { }+
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+
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void QDragManager::move(const QPoint&) {+
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}+
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+
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void QDragManager::updateCursor()+
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{+
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#ifndef QT_NO_CURSOR+
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    QCursor cursor = willDrop ? overrideCursor : Qt::ForbiddenCursor;+
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    if (!restoreCursor) {+
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        QApplication::setOverrideCursor(cursor);+
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        restoreCursor = true;+
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    }+
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    else {+
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        QApplication::changeOverrideCursor(cursor);+
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    }+
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#endif+
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}+
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+
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+
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bool QDragManager::eventFilter(QObject *o, QEvent *e)+
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{+
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 if (beingCancelled) {+
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        return false;+
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    }+
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    if (!o->isWidgetType())+
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        return false;+
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+
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    switch(e->type()) {+
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        case QEvent::MouseButtonPress:+
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        {+
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        }+
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        case QEvent::MouseMove:+
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        {+
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            if (!object) { //#### this should not happen+
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                qWarning("QDragManager::eventFilter: No object");+
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                return true;+
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            }+
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            QDragManager *manager = QDragManager::self();+
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            QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;+
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            if (manager->object)+
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                possible_actions =  manager->dragPrivate()->possible_actions;+
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            else+
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                possible_actions = Qt::IgnoreAction;+
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+
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            QMouseEvent *me = (QMouseEvent *)e;+
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+
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            if (me->buttons()) {+
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                Qt::DropAction prevAction = global_accepted_action;+
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                QWidget *cw = QApplication::widgetAt(me->globalPos());+
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                // map the Coords relative to the window.+
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                if (!cw)+
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                    return true;+
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+
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                while (cw && !cw->acceptDrops() && !cw->isWindow())+
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                    cw = cw->parentWidget();+
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+
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                bool oldWillDrop = willDrop;+
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                if (object->target() != cw) {+
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                    if (object->target()) {+
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                        QDragLeaveEvent dle;+
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                        QApplication::sendEvent(object->target(), &dle);+
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                        willDrop = false;+
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                        global_accepted_action = Qt::IgnoreAction;+
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                        if (oldWillDrop != willDrop)+
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                            updateCursor();+
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                        object->d_func()->target = 0;+
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                    }+
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                    if (cw && cw->acceptDrops()) {+
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                        object->d_func()->target = cw;+
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                        QDragEnterEvent dee(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,+
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                                            me->buttons(), me->modifiers());+
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                        QApplication::sendEvent(object->target(), &dee);+
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                        willDrop = dee.isAccepted() && dee.dropAction() != Qt::IgnoreAction;+
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                        global_accepted_action = willDrop ? dee.dropAction() : Qt::IgnoreAction;+
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                        if (oldWillDrop != willDrop)+
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                            updateCursor();+
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                    }+
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                } else if (cw) {+
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                    QDragMoveEvent dme(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,+
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                                       me->buttons(), me->modifiers());+
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                    if (global_accepted_action != Qt::IgnoreAction) {+
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                        dme.setDropAction(global_accepted_action);+
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                        dme.accept();+
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                    }+
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                    QApplication::sendEvent(cw, &dme);+
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                    willDrop = dme.isAccepted();+
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                    global_accepted_action = willDrop ? dme.dropAction() : Qt::IgnoreAction;+
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                    if (oldWillDrop != willDrop) {+
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                        updatePixmap();+
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                        updateCursor();+
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                    }+
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                }+
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                if (global_accepted_action != prevAction)+
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                    emitActionChanged(global_accepted_action);+
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            }+
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            return true; // Eat all mouse events+
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        }+
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+
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        case QEvent::MouseButtonRelease:+
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        {+
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            qApp->removeEventFilter(this);+
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#ifndef QT_NO_CURSOR+
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            if (restoreCursor) {+
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                QApplication::restoreOverrideCursor();+
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                willDrop = false;+
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                restoreCursor = false;+
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            }+
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#endif+
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            if (object && object->target()) {+
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+
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                QMouseEvent *me = (QMouseEvent *)e;+
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+
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                QDragManager *manager = QDragManager::self();+
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                QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;+
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+
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                QDropEvent de(object->target()->mapFromGlobal(me->globalPos()), possible_actions, dropData,+
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                              me->buttons(), me->modifiers());+
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                QApplication::sendEvent(object->target(), &de);+
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                if (de.isAccepted())+
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                    global_accepted_action = de.dropAction();+
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                else+
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                    global_accepted_action = Qt::IgnoreAction;+
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+
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                if (object)+
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                    object->deleteLater();+
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                drag_object = object = 0;+
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            }+
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            eventLoop->exit();+
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            return true; // Eat all mouse events+
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        }+
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+
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        default:+
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             break;+
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    }+
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    return false;+
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}+
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+
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Qt::DropAction QDragManager::drag(QDrag *o)+
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{+
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    Q_ASSERT(!qt_symbian_dnd_dragging);+
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    if (object == o || !o || !o->source())+
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         return Qt::IgnoreAction;+
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+
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    if (object) {+
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        cancel();+
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        qApp->removeEventFilter(this);+
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        beingCancelled = false;+
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    }+
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+
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    object = drag_object = o;+
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+
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    oldstate = Qt::NoModifier; // #### Should use state that caused the drag+
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    willDrop = false;+
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    updatePixmap();+
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    updateCursor();+
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+
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#ifndef QT_NO_CURSOR+
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    qt_symbian_set_cursor_visible(true); //force cursor on even for touch phone+
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#endif+
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+
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    object->d_func()->target = 0;+
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+
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    qApp->installEventFilter(this);+
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+
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    global_accepted_action = defaultAction(dragPrivate()->possible_actions, Qt::NoModifier);+
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    qt_symbian_dnd_dragging = true;+
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+
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    eventLoop = new QEventLoop;+
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    // block+
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    (void) eventLoop->exec(QEventLoop::AllEvents);+
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    delete eventLoop;+
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    eventLoop = 0;+
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+
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#ifndef QT_NO_CURSOR+
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    qt_symbian_set_cursor_visible(false);+
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+
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    overrideCursor = QCursor(); //deref the cursor data+
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    qt_symbian_dnd_dragging = false;+
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#endif+
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+
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    return global_accepted_action;+
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}+
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+
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+
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void QDragManager::cancel(bool deleteSource)+
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{+
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    beingCancelled = true;+
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+
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    if (object->target()) {+
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        QDragLeaveEvent dle;+
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        QApplication::sendEvent(object->target(), &dle);+
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    }+
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+
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    if (drag_object) {+
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        if (deleteSource)+
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            object->deleteLater();+
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        drag_object = object = 0;+
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    }+
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+
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#ifndef QT_NO_CURSOR+
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    if (restoreCursor) {+
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        QApplication::restoreOverrideCursor();+
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        restoreCursor = false;+
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    }+
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#endif+
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+
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    global_accepted_action = Qt::IgnoreAction;+
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}+
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+
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+
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void QDragManager::drop()+
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{+
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#ifndef QT_NO_CURSOR+
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    if (restoreCursor) {+
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        QApplication::restoreOverrideCursor();+
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        restoreCursor = false;+
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    }+
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#endif+
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}+
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+
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QVariant QDropData::retrieveData_sys(const QString &mimetype, QVariant::Type type) const+
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{+
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    if (!drag_object)+
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        return QVariant();+
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    QByteArray data =  drag_object->mimeData()->data(mimetype);+
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    if (type == QVariant::String)+
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        return QString::fromUtf8(data);+
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    return data;+
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}+
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+
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bool QDropData::hasFormat_sys(const QString &format) const+
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{+
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    return formats().contains(format);+
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}+
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+
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QStringList QDropData::formats_sys() const+
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{+
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    if (drag_object)+
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        return drag_object->mimeData()->formats();+
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    return QStringList();+
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}+
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+
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QT_END_NAMESPACE+
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#endif // QT_NO_DRAGANDDROP+
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