qdrag.cpp

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#include <qwidget.h>
#include <qdrag.h>
#include <qpixmap.h>
#include <qpoint.h>
#include "qdnd_p.h"

#ifndef QT_NO_DRAGANDDROP

QT_BEGIN_NAMESPACE

QDrag::QDrag(QWidget *dragSource)
    : QObject(*new QDragPrivate, dragSource)
{
    Q_D(QDrag);
    d->source = dragSource;
    d->target = 0;
    d->data = 0;
    d->hotspot = QPoint(-10, -10);
    d->possible_actions = Qt::CopyAction;
    d->executed_action = Qt::IgnoreAction;
    d->defaultDropAction = Qt::IgnoreAction;
}

QDrag::~QDrag()
{
    Q_D(QDrag);
    delete d->data;
    QDragManager *manager = QDragManager::self();
    if (manager && manager->object == this)
        manager->cancel(false);
}

void QDrag::setMimeData(QMimeData *data)
{
    Q_D(QDrag);
    if (d->data == data)
        return;
    if (d->data != 0)
        delete d->data;
    d->data = data;
}

QMimeData *QDrag::mimeData() const
{
    Q_D(const QDrag);
    return d->data;
}

void QDrag::setPixmap(const QPixmap &pixmap)
{
    Q_D(QDrag);
    d->pixmap = pixmap;
}

QPixmap QDrag::pixmap() const
{
    Q_D(const QDrag);
    return d->pixmap;
}

void QDrag::setHotSpot(const QPoint& hotspot)
{
    Q_D(QDrag);
    d->hotspot = hotspot;
}

QPoint QDrag::hotSpot() const
{
    Q_D(const QDrag);
    return d->hotspot;
}

QWidget *QDrag::source() const
{
    Q_D(const QDrag);
    return d->source;
}

QWidget *QDrag::target() const
{
    Q_D(const QDrag);
    return d->target;
}

Qt::DropAction QDrag::exec(Qt::DropActions supportedActions)
{
    return exec(supportedActions, Qt::IgnoreAction);
}

Qt::DropAction QDrag::exec(Qt::DropActions supportedActions, Qt::DropAction defaultDropAction)
{
    Q_D(QDrag);
    if (!d->data) {
        qWarning("QDrag: No mimedata set before starting the drag");
        return d->executed_action;
    }
    QDragManager *manager = QDragManager::self();
    d->defaultDropAction = Qt::IgnoreAction;
    d->possible_actions = supportedActions;

    if (manager) {
        if (defaultDropAction == Qt::IgnoreAction) {
            if (supportedActions & Qt::MoveAction) {
                d->defaultDropAction = Qt::MoveAction;
            } else if (supportedActions & Qt::CopyAction) {
                d->defaultDropAction = Qt::CopyAction;
            } else if (supportedActions & Qt::LinkAction) {
                d->defaultDropAction = Qt::LinkAction;
            }
        } else {
            d->defaultDropAction = defaultDropAction;
        }
        d->executed_action = manager->drag(this);
    }

    return d->executed_action;
}

Qt::DropAction QDrag::start(Qt::DropActions request)
{
    Q_D(QDrag);
    if (!d->data) {
        qWarning("QDrag: No mimedata set before starting the drag");
        return d->executed_action;
    }
    QDragManager *manager = QDragManager::self();
    d->defaultDropAction = Qt::IgnoreAction;
    d->possible_actions = request | Qt::CopyAction;
    if (manager)
        d->executed_action = manager->drag(this);
    return d->executed_action;
}

void QDrag::setDragCursor(const QPixmap &cursor, Qt::DropAction action)
{
    Q_D(QDrag);
    if (action != Qt::CopyAction && action != Qt::MoveAction && action != Qt::LinkAction)
        return;
    if (cursor.isNull())
        d->customCursors.remove(action);
    else
        d->customCursors[action] = cursor;
}

QT_END_NAMESPACE

#endif // QT_NO_DRAGANDDROP