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