draglistbox.cpp

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/***************************************************************************
                          draglistbox.cpp  -  description
                             -------------------
    begin                : Sun May 29 2005
    copyright            : (C) 2005 by Jason Harris
    email                : kstars@30doradus.org
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program 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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "draglistbox.h"

#include <QDragEnterEvent>
#include <QMimeData>
#include <QMouseEvent>
#include <QDropEvent>

#include <klocale.h>
#include <kdebug.h>

DragListBox::DragListBox( QWidget *parent, const char *name )
        : KListWidget( parent ) {

    if ( name ) {
        setObjectName( name );
    }
    setAcceptDrops( true );
    leftButtonDown = false;
}

DragListBox::~DragListBox() {}

bool DragListBox::contains( const QString &s ) const {
    QList<QListWidgetItem*> foundList = findItems( s, Qt::MatchExactly );
    if ( foundList.isEmpty() ) return false;
    else return true;
}

void DragListBox::dragEnterEvent( QDragEnterEvent *evt )
{
    if ( evt->mimeData()->hasText() ) {
        evt->acceptProposedAction();
    } else {
        evt->ignore();
    }
}

void DragListBox::dragMoveEvent( QDragMoveEvent *evt )
{
    if ( evt->mimeData()->hasText() ) {
        evt->acceptProposedAction();
    } else {
        evt->ignore();
    }
}

void DragListBox::dropEvent( QDropEvent *evt ) {
    QString text;

    if ( evt->mimeData()->hasText() ) {
        text = evt->mimeData()->text();

        //Copy an item dragged from FieldPool to FieldList
        //If we dragged an "Ignore" item from the FieldPool to the FieldList, then we don't
        //need to insert the item, because FieldPool already has a persistent Ignore item.
        if ( !( text == i18n("Ignore" ) && QString(evt->source()->objectName()) == "FieldList" &&
                evt->source() != this )) {
        QListWidgetItem *lwi = itemAt( evt->pos() );
        if ( lwi == 0 && evt->pos().y() > visualItemRect(item(count()-1)).bottom() ) {
        addItem( text );
        } else {
        int i = row( itemAt( evt->pos() ) );
        insertItem( i, text );
        } 
        }

        //Remove an item dragged from FieldList to FieldPool.
        //If we dragged the "Ignore" item from FieldList to FieldPool, then we don't
        //want to remove the item from the FieldPool
        if ( !( text == i18n("Ignore" ) && QString(evt->source()->objectName()) == "FieldPool" &&
                evt->source() != this ) ) {
            DragListBox *fp = (DragListBox*)evt->source();
            delete fp->takeItem( fp->currentRow() );
        }
    }
    evt->acceptProposedAction();
}


void DragListBox::mousePressEvent( QMouseEvent *evt ) {
    QListWidget::mousePressEvent( evt );

    if ( evt->button() == Qt::LeftButton ) {
        leftButtonDown = true;
    }
}

void DragListBox::mouseReleaseEvent( QMouseEvent *evt ) {
    QListWidget::mouseReleaseEvent( evt );

    if ( evt->button() == Qt::LeftButton ) {
        leftButtonDown = false;
    }
}

void DragListBox::mouseMoveEvent( QMouseEvent *evt ) {

    if ( leftButtonDown ) {
        leftButtonDown = false; //Don't create multiple QDrag objects!

        QDrag *drag = new QDrag( this );
        QMimeData *mimeData = new QMimeData;
        mimeData->setText( currentItem()->text() );
        drag->setMimeData( mimeData );

        drag->exec();
        evt->accept();
    }
}

#include "draglistbox.moc"