Files
oak-editor/ui/nodeview.cpp
T
2019-04-08 22:16:47 +10:00

52 lines
1.1 KiB
C++

#include "nodeview.h"
#include <QWheelEvent>
#include <QDebug>
NodeView::NodeView(QGraphicsScene *scene, QWidget *parent) :
QGraphicsView(scene, parent),
hand_moving_(false)
{
setMouseTracking(true);
setWindowTitle(tr("Node Editor"));
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
}
void NodeView::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::RightButton) {
hand_moving_ = true;
drag_start_ = event->pos();
} else {
QGraphicsView::mousePressEvent(event);
}
}
void NodeView::mouseMoveEvent(QMouseEvent *event)
{
if (hand_moving_) {
QPointF scene_delta = mapToScene(event->pos() - drag_start_) - mapToScene(0.0, 0.0);
emit ScrollChanged(scene_delta.x(), scene_delta.y());
drag_start_ = event->pos();
} else {
QGraphicsView::mouseMoveEvent(event);
}
}
void NodeView::mouseReleaseEvent(QMouseEvent *event)
{
hand_moving_ = false;
QGraphicsView::mouseReleaseEvent(event);
}
void NodeView::wheelEvent(QWheelEvent *event)
{
if (event->angleDelta().y() > 0) {
scale(0.9, 0.9);
} else {
scale(1.1, 1.1);
}
}