File indexing completed on 2024-10-13 03:27:31

 /*
     PeriodicTableScene - Periodic Table Graphics Scene for Kalzium
 
     SPDX-FileCopyrightText: 2005-2006 Pino Toscano <toscano.pino@tiscali.it>
     SPDX-FileCopyrightText: 2003-2006 Carsten Niehaus <cniehaus@kde.org>
     SPDX-FileCopyrightText: 2007-2009 Marcus D. Hanwell <marcus@cryos.org>
     SPDX-FileCopyrightText: 2010 Etienne Rebetez <etienne.rebetez@oberwallis.ch>
 
     SPDX-License-Identifier: LGPL-2.1-or-later
 */
 
 #include "periodictablescene.h"
 
 #include <QApplication>
 #include <QDrag>
 #include <QGraphicsSceneDragDropEvent>
 #include <QGraphicsSceneMouseEvent>
 #include <QMimeData>
 #include <QPainter>
 #include <QPixmap>
 #include <QStyleOptionGraphicsItem>
 
 PeriodicTableScene::PeriodicTableScene(QObject *parent)
     : QGraphicsScene(parent)
     , m_prevHoverElement(-1)
 {
     QPalette widgetPalette = palette();
     setBackgroundBrush(QBrush(widgetPalette.base()));
 
     setItemIndexMethod(QGraphicsScene::NoIndex);
 
     m_hoverTimer.setSingleShot(true);
     connect(&m_hoverTimer, &QTimer::timeout, this, &PeriodicTableScene::slotMouseover);
 }
 
 PeriodicTableScene::~PeriodicTableScene() = default;
 
 bool PeriodicTableScene::event(QEvent *e)
 {
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     if (e->type() ==  QEvent::ApplicationPaletteChange) {
         QPalette widgetPalette = qApp->palette();
         setBackgroundBrush(QBrush(widgetPalette.base()));
     }
 #endif
     return QGraphicsScene::event(e);
 }
 
 void PeriodicTableScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
 {
     if (event->button() != Qt::LeftButton) {
         return;
     }
 
     QGraphicsItem *item = QGraphicsScene::itemAt(event->scenePos(), QTransform());
     if (item->data(0).toInt() > 0 && item->data(0).toInt() < 119) {
         m_eventPos = event->scenePos();
     } else {
         Q_EMIT freeSpaceClick();
     }
 
     QGraphicsScene::mousePressEvent(event);
 }
 
 void PeriodicTableScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 {
     QGraphicsItem *item = QGraphicsScene::itemAt(m_eventPos, QTransform());
 
     if ((QApplication::mouseButtons() & Qt::LeftButton) && (event->pos() - m_eventPos).manhattanLength() > QApplication::startDragDistance()
         && item->data(0).toInt() > 0) {
         Element *pointedElement = KalziumDataObject::instance()->element(item->data(0).toInt());
 
         auto drag = new QDrag(event->widget());
         auto mimeData = new QMimeData;
 
         mimeData->setText(pointedElement->dataAsString(ChemicalDataObject::name));
         drag->setMimeData(mimeData);
 
         QPixmap pix(item->boundingRect().width() + 1, item->boundingRect().height() + 1);
         pix.fill(palette().color(QPalette::Window));
 
         QPainter painter(&pix);
         item->paint(&painter, new QStyleOptionGraphicsItem());
 
         drag->setPixmap(pix);
         drag->exec(Qt::CopyAction | Qt::MoveAction);
 
         m_eventPos = QPoint();
     } else {
         m_eventPos = event->scenePos();
 
         if (m_hoverTimer.isActive()) {
             m_hoverTimer.stop();
         }
         m_hoverTimer.start(100);
     }
 
     QGraphicsScene::mouseMoveEvent(event);
 }
 
 void PeriodicTableScene::slotMouseover()
 {
     QGraphicsItem *item = QGraphicsScene::itemAt(m_eventPos, QTransform());
 
     if (item->data(0).toInt() > 0 && item->data(0).toInt() < 119) {
         int num = item->data(0).toInt();
         if ((num > 0) && (num != m_prevHoverElement)) {
             Q_EMIT elementHovered(num);
         }
         m_prevHoverElement = num;
     }
 }
 
 void PeriodicTableScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 {
     if (event->button() != Qt::LeftButton) {
         return;
     }
 
     QGraphicsItem *item = QGraphicsScene::itemAt(event->scenePos(), QTransform());
     if (item->data(0).toInt() > 0 && item->data(0).toInt() < 119) {
         Q_EMIT(elementChanged(item->data(0).toInt()));
     }
     QGraphicsScene::mouseReleaseEvent(event);
 }
 
 #include "moc_periodictablescene.cpp"