/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qapplication.h"

#ifndef QT_NO_DRAGANDDROP

#include "qwidget.h"

#include "qdatetime.h"

#include "qbitmap.h"

#include "qcursor.h"

#include "qevent.h"

#include "qpainter.h"

#include "qdnd_p.h"

#include "qt_s60_p.h"

#include <COECNTRL.H>

// pointer cursor

#include <w32std.h>

#include <gdi.h>

#include <QCursor>

QT_BEGIN_NAMESPACE

//### artistic impression of Symbians default DnD cursor ?

static QPixmap *defaultPm = 0;

static const int default_pm_hotx = -50;

static const int default_pm_hoty = -50;

static const char *const default_pm[] = {

"13 9 3 1",

".      c None",

"       c #000000",

"X      c #FFFFFF",

"X X X X X X X",

" X X X X X X ",

"X ......... X",

" X.........X ",

"X ......... X",

" X.........X ",

"X ......... X",

" X X X X X X ",

"X X X X X X X",

};

//### actions need to be redefined for S60

// Shift/Ctrl handling, and final drop status

static Qt::DropAction global_accepted_action = Qt::MoveAction;

static Qt::DropActions possible_actions = Qt::IgnoreAction;

// static variables in place of a proper cross-process solution

static QDrag *drag_object;

static bool qt_symbian_dnd_dragging = false;

static Qt::KeyboardModifiers oldstate;

void QDragManager::updatePixmap()

{

    QPixmap pm;

    QPoint pm_hot(default_pm_hotx,default_pm_hoty);

    if (drag_object) {

        pm = drag_object->pixmap();

        if (!pm.isNull())

            pm_hot = drag_object->hotSpot();

    }

    if (pm.isNull()) {

        if (!defaultPm)

            defaultPm = new QPixmap(default_pm);

        pm = *defaultPm;

    }

#ifndef QT_NO_CURSOR

    QCursor cursor(pm, pm_hot.x(), pm_hot.y());

    overrideCursor = cursor;

#endif

}

void QDragManager::timerEvent(QTimerEvent *) { }

void QDragManager::move(const QPoint&) {

}

void QDragManager::updateCursor()

{

#ifndef QT_NO_CURSOR

    QCursor cursor = willDrop ? overrideCursor : Qt::ForbiddenCursor;

    if (!restoreCursor) {

        QApplication::setOverrideCursor(cursor);

        restoreCursor = true;

    }

    else {

        QApplication::changeOverrideCursor(cursor);

    }

#endif

}

bool QDragManager::eventFilter(QObject *o, QEvent *e)

{

 if (beingCancelled) {

        return false;

    }

    if (!o->isWidgetType())

        return false;

    switch(e->type()) {

        case QEvent::MouseButtonPress:

        {

        }

        case QEvent::MouseMove:

        {

            if (!object) { //#### this should not happen

                qWarning("QDragManager::eventFilter: No object");

                return true;

            }

            QDragManager *manager = QDragManager::self();

            QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;

            if (manager->object)

                possible_actions =  manager->dragPrivate()->possible_actions;

            else

                possible_actions = Qt::IgnoreAction;

            QMouseEvent *me = (QMouseEvent *)e;

            if (me->buttons()) {

                Qt::DropAction prevAction = global_accepted_action;

                QWidget *cw = QApplication::widgetAt(me->globalPos());

                // map the Coords relative to the window.

                if (!cw)

                    return true;

                while (cw && !cw->acceptDrops() && !cw->isWindow())

                    cw = cw->parentWidget();

                bool oldWillDrop = willDrop;

                if (object->target() != cw) {

                    if (object->target()) {

                        QDragLeaveEvent dle;

                        QApplication::sendEvent(object->target(), &dle);

                        willDrop = false;

                        global_accepted_action = Qt::IgnoreAction;

                        if (oldWillDrop != willDrop)

                            updateCursor();

                        object->d_func()->target = 0;

                    }

                    if (cw && cw->acceptDrops()) {

                        object->d_func()->target = cw;

                        QDragEnterEvent dee(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,

                                            me->buttons(), me->modifiers());

                        QApplication::sendEvent(object->target(), &dee);

                        willDrop = dee.isAccepted() && dee.dropAction() != Qt::IgnoreAction;

                        global_accepted_action = willDrop ? dee.dropAction() : Qt::IgnoreAction;

                        if (oldWillDrop != willDrop)

                            updateCursor();

                    }

                } else if (cw) {

                    QDragMoveEvent dme(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,

                                       me->buttons(), me->modifiers());

                    if (global_accepted_action != Qt::IgnoreAction) {

                        dme.setDropAction(global_accepted_action);

                        dme.accept();

                    }

                    QApplication::sendEvent(cw, &dme);

                    willDrop = dme.isAccepted();

                    global_accepted_action = willDrop ? dme.dropAction() : Qt::IgnoreAction;

                    if (oldWillDrop != willDrop) {

                        updatePixmap();

                        updateCursor();

                    }

                }

                if (global_accepted_action != prevAction)

                    emitActionChanged(global_accepted_action);

            }

            return true; // Eat all mouse events

        }

        case QEvent::MouseButtonRelease:

        {

            qApp->removeEventFilter(this);

#ifndef QT_NO_CURSOR

            if (restoreCursor) {

                QApplication::restoreOverrideCursor();

                willDrop = false;

                restoreCursor = false;

            }

#endif

            if (object && object->target()) {

                QMouseEvent *me = (QMouseEvent *)e;

                QDragManager *manager = QDragManager::self();

                QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;

                QDropEvent de(object->target()->mapFromGlobal(me->globalPos()), possible_actions, dropData,

                              me->buttons(), me->modifiers());

                QApplication::sendEvent(object->target(), &de);

                if (de.isAccepted())

                    global_accepted_action = de.dropAction();

                else

                    global_accepted_action = Qt::IgnoreAction;

                if (object)

                    object->deleteLater();

                drag_object = object = 0;

            }

            eventLoop->exit();

            return true; // Eat all mouse events

        }

        default:

             break;

    }

    return false;

}

Qt::DropAction QDragManager::drag(QDrag *o)

{

    Q_ASSERT(!qt_symbian_dnd_dragging);

    if (object == o || !o || !o->source())

         return Qt::IgnoreAction;

    if (object) {

        cancel();

        qApp->removeEventFilter(this);

        beingCancelled = false;

    }

    object = drag_object = o;

    oldstate = Qt::NoModifier; // #### Should use state that caused the drag

    willDrop = false;

    updatePixmap();

    updateCursor();

#ifndef QT_NO_CURSOR

    qt_symbian_set_cursor_visible(true); //force cursor on even for touch phone

#endif

    object->d_func()->target = 0;

    qApp->installEventFilter(this);

    global_accepted_action = defaultAction(dragPrivate()->possible_actions, Qt::NoModifier);

    qt_symbian_dnd_dragging = true;

    eventLoop = new QEventLoop;

    // block

    (void) eventLoop->exec(QEventLoop::AllEvents);

    delete eventLoop;

    eventLoop = 0;

#ifndef QT_NO_CURSOR

    qt_symbian_set_cursor_visible(false);

    overrideCursor = QCursor(); //deref the cursor data

    qt_symbian_dnd_dragging = false;

#endif

    return global_accepted_action;

}

void QDragManager::cancel(bool deleteSource)

{

    beingCancelled = true;

    if (object->target()) {

        QDragLeaveEvent dle;

        QApplication::sendEvent(object->target(), &dle);

    }

    if (drag_object) {

        if (deleteSource)

            object->deleteLater();

        drag_object = object = 0;

    }

#ifndef QT_NO_CURSOR

    if (restoreCursor) {

        QApplication::restoreOverrideCursor();

        restoreCursor = false;

    }

#endif

    global_accepted_action = Qt::IgnoreAction;

}

void QDragManager::drop()

{

#ifndef QT_NO_CURSOR

    if (restoreCursor) {

        QApplication::restoreOverrideCursor();

        restoreCursor = false;

    }

#endif

}

QVariant QDropData::retrieveData_sys(const QString &mimetype, QVariant::Type type) const

{

    if (!drag_object)

        return QVariant();

    QByteArray data =  drag_object->mimeData()->data(mimetype);

    if (type == QVariant::String)

        return QString::fromUtf8(data);

    return data;

}

bool QDropData::hasFormat_sys(const QString &format) const

{

    return formats().contains(format);

}

QStringList QDropData::formats_sys() const

{

    if (drag_object)

        return drag_object->mimeData()->formats();

    return QStringList();

}

QT_END_NAMESPACE

#endif // QT_NO_DRAGANDDROP