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/**********************************************************************
** Copyright (C) 2002 Trolltech AS. All rights reserved.
**
** This file is part of TQt 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 TQt Enterprise Edition or TQt Professional Edition
** licenses may use this file in accordance with the TQt 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 sales@trolltech.com for
** information about TQt Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#include "listdnd.h"
#include <tqwidget.h>
#include <tqpainter.h>
ListDnd::ListDnd( TQScrollView * eventSource, const char * name )
: TQObject( eventSource, name ),
dragInside( FALSE ), dragDelete( TRUE ), dropConfirmed( FALSE ), dMode( Both )
{
src = eventSource;
src->setAcceptDrops( TRUE );
src->installEventFilter( this );
src->viewport()->installEventFilter( this );
line = new TQWidget( src->viewport(), 0, TQt::WStyle_NoBorder | WStyle_StaysOnTop );
line->setBackgroundColor( TQt::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( TQObject *, TQEvent * event )
{
switch ( event->type() ) {
case TQEvent::DragEnter:
return dragEnterEvent( (TQDragEnterEvent *) event );
case TQEvent::DragLeave:
return dragLeaveEvent( (TQDragLeaveEvent *) event );
case TQEvent::DragMove:
return dragMoveEvent( (TQDragMoveEvent *) event );
case TQEvent::Drop:
return dropEvent( (TQDropEvent *) event );
case TQEvent::MouseButtonPress:
return mousePressEvent( (TQMouseEvent *) event );
case TQEvent::MouseMove:
return mouseMoveEvent( (TQMouseEvent *) event );
default:
break;
}
return FALSE;
}
bool ListDnd::dragEnterEvent( TQDragEnterEvent * 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( TQDragLeaveEvent * )
{
dragInside = FALSE;
line->hide();
return TRUE;
}
bool ListDnd::dragMoveEvent( TQDragMoveEvent * event )
{
if ( dragInside && dMode && !( dMode & NullDrop ) ) {
updateLine( event->pos() );
}
return TRUE;
}
bool ListDnd::dropEvent( TQDropEvent * )
{
// do nothing
return FALSE;
}
bool ListDnd::mousePressEvent( TQMouseEvent * event )
{
if ( event->button() == TQt::LeftButton )
mousePressPos = event->pos();
return FALSE;
}
bool ListDnd::mouseMoveEvent( TQMouseEvent * )
{
// do nothing
return FALSE;
}
void ListDnd::updateLine( const TQPoint & )
{
// do nothing
}
bool ListDnd::canDecode( TQDragEnterEvent * )
{
// do nothing
return FALSE;
}
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