File indexing completed on 2024-04-21 03:41:38

 /*
     SPDX-FileCopyrightText: 2007 Carsten Niehaus <cniehaus@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "isotopeguideview.h"
 
 #include "isotopescene.h"
 #include <QScrollBar>
 
 IsotopeGuideView::IsotopeGuideView(QWidget *parent)
     : QGraphicsView(parent)
 {
     m_guidedView = nullptr;
     m_scale = 1.0;
 
     setCursor(Qt::OpenHandCursor);
 }
 
 void IsotopeGuideView::setGuidedView(IsotopeView *guidedView)
 {
     m_guidedView = guidedView;
     connect(m_guidedView, &IsotopeView::zoomLevelChanged, this, &IsotopeGuideView::setZoomLevel);
     connect(m_guidedView, &IsotopeView::visibleSceneRectChanged, this, &IsotopeGuideView::setVisibleSceneRect);
 
     updateScene();
 }
 
 void IsotopeGuideView::setVisibleSceneRect(const QPolygonF &sceneRect)
 {
     m_visibleSceneRect = sceneRect;
     viewport()->update();
 }
 
 void IsotopeGuideView::drawForeground(QPainter *painter, const QRectF &rect)
 {
     if (m_guidedView && m_visibleSceneRect.boundingRect().intersects(rect)) {
         QRectF drawRect = m_visibleSceneRect.boundingRect().adjusted(0, 0, -1, -1);
         painter->setPen(QPen(Qt::yellow, 1.0 / m_scale));
         painter->fillRect(drawRect, QBrush(QColor(0, 0, 0, 100)));
         painter->drawRect(drawRect);
     }
 }
 
 void IsotopeGuideView::resizeEvent(QResizeEvent *event)
 {
     Q_UNUSED(event)
     m_scale = qMin(qreal(viewport()->width()) / sceneRect().width(), qreal(viewport()->height()) / sceneRect().height());
     setTransform(QTransform::fromScale(m_scale, m_scale));
 }
 
 void IsotopeGuideView::mousePressEvent(QMouseEvent *event)
 {
     m_dragEvent = mapFromScene(m_visibleSceneRect).boundingRect().contains(event->pos());
     if (m_dragEvent && event->buttons() & Qt::LeftButton) {
         m_lastMousePos = event->pos();
         setCursor(Qt::ClosedHandCursor);
     }
 }
 
 void IsotopeGuideView::mouseReleaseEvent(QMouseEvent *event)
 {
     Q_UNUSED(event)
     m_dragEvent = false;
     setCursor(Qt::OpenHandCursor);
 }
 
 void IsotopeGuideView::mouseMoveEvent(QMouseEvent *event)
 {
     if (m_dragEvent && event->buttons() & Qt::LeftButton) {
         const QPoint p1(m_guidedView->mapFromScene(mapToScene(m_lastMousePos)));
         const QPoint p2(m_guidedView->mapFromScene(mapToScene(event->pos())));
         m_guidedView->horizontalScrollBar()->setValue(m_guidedView->horizontalScrollBar()->value() + p2.x() - p1.x());
         m_guidedView->verticalScrollBar()->setValue(m_guidedView->verticalScrollBar()->value() + p2.y() - p1.y());
         m_lastMousePos = event->pos();
 
         m_visibleSceneRect = m_guidedView->visibleSceneRect();
         viewport()->update();
     }
 }
 
 void IsotopeGuideView::setZoomLevel(double zoomLevel)
 {
     m_zoomLevel = zoomLevel;
 }
 
 void IsotopeGuideView::updateScene()
 {
     m_zoomLevel = m_guidedView->zoomLevel();
     setScene(m_guidedView->scene());
     setSceneRect(scene()->itemsBoundingRect());
     ensureVisible(scene()->sceneRect());
     resizeEvent(nullptr);
 }
 
 #include "moc_isotopeguideview.cpp"