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Diffstat (limited to 'kdevdesigner/designer/listdnd.cpp')
-rw-r--r-- | kdevdesigner/designer/listdnd.cpp | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/kdevdesigner/designer/listdnd.cpp b/kdevdesigner/designer/listdnd.cpp new file mode 100644 index 00000000..34562e6f --- /dev/null +++ b/kdevdesigner/designer/listdnd.cpp @@ -0,0 +1,142 @@ +/********************************************************************** +** 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; +} |