Files
oak-editor/ui/nodeview.cpp
T

62 lines
1.3 KiB
C++

#include "nodeview.h"
#include <QWheelEvent>
#include <QScrollBar>
#include <QDebug>
NodeView::NodeView(QGraphicsScene *scene, QWidget *parent) :
QGraphicsView(scene, parent),
hand_moving_(false)
{
setMouseTracking(true);
setWindowTitle(tr("Node Editor"));
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
}
void NodeView::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::MidButton) {
hand_moving_ = true;
drag_start_ = event->pos();
} else {
QGraphicsView::mousePressEvent(event);
}
}
void NodeView::mouseMoveEvent(QMouseEvent *event)
{
if (hand_moving_) {
QPoint delta = event->pos() - drag_start_;
horizontalScrollBar()->setValue(horizontalScrollBar()->value() - delta.x());
verticalScrollBar()->setValue(verticalScrollBar()->value() - delta.y());
drag_start_ = event->pos();
} else {
QGraphicsView::mouseMoveEvent(event);
}
}
void NodeView::mouseReleaseEvent(QMouseEvent *event)
{
if (!hand_moving_) {
hand_moving_ = false;
QGraphicsView::mouseReleaseEvent(event);
}
}
void NodeView::wheelEvent(QWheelEvent *event)
{
if (event->modifiers() & Qt::ControlModifier) {
if (event->angleDelta().y() < 0) {
scale(0.9, 0.9);
} else {
scale(1.1, 1.1);
}
} else {
QGraphicsView::wheelEvent(event);
}
}