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/**********************************************************************
** Copyright (C) 2002 Trolltech AS. All rights reserved.
**
** This file is part of Qt Designer.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
** See http://www.trolltech.com/pricing.html or email [email protected] for
** information about Qt Commercial License Agreements.
**
** Contact [email protected] if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#include "listdnd.h"
#include <qwidget.h>
#include <qpainter.h>
ListDnd::ListDnd( QScrollView * eventSource, const char * name )
: QObject( eventSource, name ),
dragInside( FALSE ), dragDelete( TRUE ), dropConfirmed( FALSE ), dMode( Both )
{
src = eventSource;
src->setAcceptDrops( TRUE );
src->installEventFilter( this );
src->viewport()->installEventFilter( this );
line = new QWidget( src->viewport(), 0, Qt::WStyle_NoBorder | WStyle_StaysOnTop );
line->setBackgroundColor( Qt::black );
line->resize( src->viewport()->width(), 2 );
line->hide();
}
void ListDnd::setDragMode( int mode )
{
dMode = mode;
}
int ListDnd::dragMode() const
{
return dMode;
}
bool ListDnd::eventFilter( QObject *, QEvent * event )
{
switch ( event->type() ) {
case QEvent::DragEnter:
return dragEnterEvent( (QDragEnterEvent *) event );
case QEvent::DragLeave:
return dragLeaveEvent( (QDragLeaveEvent *) event );
case QEvent::DragMove:
return dragMoveEvent( (QDragMoveEvent *) event );
case QEvent::Drop:
return dropEvent( (QDropEvent *) event );
case QEvent::MouseButtonPress:
return mousePressEvent( (QMouseEvent *) event );
case QEvent::MouseMove:
return mouseMoveEvent( (QMouseEvent *) event );
default:
break;
}
return FALSE;
}
bool ListDnd::dragEnterEvent( QDragEnterEvent * event )
{
if ( dMode == None ) {
return TRUE;
}
bool ok = ( ( ( dMode & Both ) == Both ) ||
( ( dMode & Internal ) && ( event->source() == src ) ) ||
( ( dMode & External ) && ( event->source() != src ) ) );
if ( ok && canDecode( event ) ) {
event->accept();
dragInside = TRUE;
if ( !( dMode & NullDrop ) ) {
updateLine( event->pos() );
line->show();
}
}
return TRUE;
}
bool ListDnd::dragLeaveEvent( QDragLeaveEvent * )
{
dragInside = FALSE;
line->hide();
return TRUE;
}
bool ListDnd::dragMoveEvent( QDragMoveEvent * event )
{
if ( dragInside && dMode && !( dMode & NullDrop ) ) {
updateLine( event->pos() );
}
return TRUE;
}
bool ListDnd::dropEvent( QDropEvent * )
{
// do nothing
return FALSE;
}
bool ListDnd::mousePressEvent( QMouseEvent * event )
{
if ( event->button() == LeftButton )
mousePressPos = event->pos();
return FALSE;
}
bool ListDnd::mouseMoveEvent( QMouseEvent * )
{
// do nothing
return FALSE;
}
void ListDnd::updateLine( const QPoint & )
{
// do nothing
}
bool ListDnd::canDecode( QDragEnterEvent * )
{
// do nothing
return FALSE;
}
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