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/* -*- mode: c++; c-basic-offset:4 -*-
utils/dragqueen.cpp
This file is part of Kleopatra, the KDE keymanager
Copyright (c) 2007 Klarälvdalens Datakonsult AB
Kleopatra 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.
Kleopatra 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
In addition, as a special exception, the copyright holders give
permission to link the code of this program with any edition of
the Qt library by Trolltech AS, Norway (or with modified versions
of Qt that use the same license as Qt), and distribute linked
combinations including the two. You must obey the GNU General
Public License in all respects for all of the code used other than
Qt. If you modify this file, you may extend this exception to
your version of the file, but you are not obligated to do so. If
you do not wish to do so, delete this exception statement from
your version.
*/
#include <config-kleopatra.h>
#include "dragqueen.h"
#include <QDrag>
#include <QMouseEvent>
#include <QStringList>
#include <QVariant>
#include <QApplication>
#include <QUrl>
#include <QStyle>
#include <algorithm>
using namespace Kleo;
namespace {
class MimeDataProxy : public QMimeData {
Q_OBJECT
public:
explicit MimeDataProxy( QMimeData * source )
: QMimeData(), m_source( source )
{
}
/* reimp */ QStringList formats() const {
if ( m_source )
return m_source->formats();
else
return QStringList();
}
/* reimp */ bool hasFormat( const QString & format ) const {
return m_source && m_source->hasFormat( format );
}
protected:
/* reimp */ QVariant retrieveData( const QString & format, QVariant::Type type ) const {
if ( !m_source )
return QVariant();
// Doesn't work, is protected:
// return m_source->retrieveData( format, type );
switch ( type ) {
case QVariant::String:
if ( format == QLatin1String( "text/plain" ) )
return m_source->text();
if ( format == QLatin1String( "text/html" ) )
return m_source->html();
break;
case QVariant::Color:
if ( format == QLatin1String( "application/x-color" ) )
return m_source->colorData();
break;
case QVariant::Image:
if ( format == QLatin1String( "application/x-qt-image" ) )
return m_source->imageData();
break;
case QVariant::List:
case QVariant::Url:
if ( format == QLatin1String( "text/uri-list" ) ) {
const QList<QUrl> urls = m_source->urls();
if ( urls.size() == 1 )
return urls.front();
QList<QVariant> result;
std::copy( urls.begin(), urls.end(),
std::back_inserter( result ) );
return result;
}
break;
default:
break;
}
QVariant v = m_source->data( format );
v.convert( type );
return v;
}
private:
QPointer<QMimeData> m_source;
};
}
DragQueen::DragQueen( QWidget * p, Qt::WindowFlags f )
: QLabel( p, f ),
m_data(),
m_dragStartPosition()
{
}
DragQueen::DragQueen( const QString & t, QWidget * p, Qt::WindowFlags f )
: QLabel( t, p, f ),
m_data(),
m_dragStartPosition()
{
}
DragQueen::~DragQueen() {
delete m_data;
}
void DragQueen::setUrl( const QString & url ) {
QMimeData * data = new QMimeData;
QList<QUrl> urls;
urls.push_back( QUrl( url ) );
data->setUrls( urls );
setMimeData( data );
}
QString DragQueen::url() const {
if ( !m_data || !m_data->hasUrls() )
return QString();
const QList<QUrl> urls = m_data->urls();
if ( urls.empty() )
return QString();
return urls.front().toString();
}
void DragQueen::setMimeData( QMimeData * data ) {
if ( data == m_data )
return;
delete m_data;
m_data = data;
}
QMimeData * DragQueen::mimeData() const {
return m_data;
}
void DragQueen::mousePressEvent( QMouseEvent * e ) {
if ( m_data && e->button() == Qt::LeftButton )
m_dragStartPosition = e->pos();
QLabel::mousePressEvent( e );
}
static QPoint calculate_hot_spot( const QPoint & mouse, const QSize & pix, const QLabel * label ) {
const Qt::Alignment align = label->alignment();
const int margin = label->margin();
const QRect cr = label->contentsRect().adjusted( margin, margin, -margin, -margin );
const QRect rect = QStyle::alignedRect( QApplication::layoutDirection(), align, pix, cr );
return mouse - rect.topLeft();
}
void DragQueen::mouseMoveEvent( QMouseEvent * e ) {
if ( m_data &&
(e->buttons() & Qt::LeftButton) &&
( m_dragStartPosition - e->pos() ).manhattanLength() > QApplication::startDragDistance() ) {
QDrag * drag = new QDrag( this );
if ( const QPixmap * const pix = pixmap() ) {
drag->setPixmap( *pix );
drag->setHotSpot( calculate_hot_spot( e->pos(), pix->size(), this ) );
}
drag->setMimeData( new MimeDataProxy( m_data ) );
drag->exec();
} else {
QLabel::mouseMoveEvent( e );
}
}
#include "moc_dragqueen.cpp"
#include "dragqueen.moc"

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