59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
#include "nodeview.h"
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#include <QWheelEvent>
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#include <QScrollBar>
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#include <QDebug>
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NodeView::NodeView(QGraphicsScene *scene, QWidget *parent) :
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QGraphicsView(scene, parent),
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hand_moving_(false)
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{
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setMouseTracking(true);
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setWindowTitle(tr("Node Editor"));
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setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
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setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
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}
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void NodeView::mousePressEvent(QMouseEvent *event)
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{
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if (event->button() == Qt::RightButton) {
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hand_moving_ = true;
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drag_start_ = event->pos();
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} else {
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QGraphicsView::mousePressEvent(event);
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}
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}
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void NodeView::mouseMoveEvent(QMouseEvent *event)
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{
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if (hand_moving_) {
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//QPointF scene_delta = mapToScene(event->pos() - drag_start_) - mapToScene(0.0, 0.0);
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//emit ScrollChanged(scene_delta.x(), scene_delta.y());
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QPoint delta = event->pos() - drag_start_;
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horizontalScrollBar()->setValue(horizontalScrollBar()->value() + delta.x());
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verticalScrollBar()->setValue(verticalScrollBar()->value() + delta.y());
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drag_start_ = event->pos();
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} else {
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QGraphicsView::mouseMoveEvent(event);
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}
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}
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void NodeView::mouseReleaseEvent(QMouseEvent *event)
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{
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hand_moving_ = false;
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QGraphicsView::mouseReleaseEvent(event);
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}
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void NodeView::wheelEvent(QWheelEvent *event)
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{
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if (event->angleDelta().y() > 0) {
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scale(0.9, 0.9);
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} else {
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scale(1.1, 1.1);
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}
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}
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