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// Copyright 2015 - 2025, GIBIS-UNIFESP and the wiRedPanda contributors
// SPDX-License-Identifier: GPL-3.0-or-later
#include "graphicsview.h"
#include <QApplication>
#include <QDebug>
#include <QKeyEvent>
#include <QScrollBar>
GraphicsView::GraphicsView(QWidget *parent)
: QGraphicsView(parent)
{
setAcceptDrops(true);
setMouseTracking(true);
setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
setResizeAnchor(QGraphicsView::AnchorUnderMouse);
setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
setCacheMode(QGraphicsView::CacheBackground);
}
bool GraphicsView::canZoomIn() const
{
return m_zoomLevel < 3;
}
bool GraphicsView::canZoomOut() const
{
return m_zoomLevel > -9;
}
void GraphicsView::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::MiddleButton) {
m_pan = true;
m_panStartX = event->pos().x();
m_panStartY = event->pos().y();
viewport()->setCursor(Qt::ClosedHandCursor);
event->accept();
return;
}
QGraphicsView::mousePressEvent(event);
}
void GraphicsView::mouseMoveEvent(QMouseEvent *event)
{
if (m_pan || m_space) {
horizontalScrollBar()->setValue(horizontalScrollBar()->value() - (event->pos().x() - m_panStartX));
verticalScrollBar()->setValue(verticalScrollBar()->value() - (event->pos().y() - m_panStartY));
m_panStartX = event->pos().x();
m_panStartY = event->pos().y();
event->accept();
return;
}
m_panStartX = event->pos().x();
m_panStartY = event->pos().y();
QGraphicsView::mouseMoveEvent(event);
}
void GraphicsView::mouseReleaseEvent(QMouseEvent *event)
{
if (event->button() == Qt::MiddleButton) {
m_pan = false;
viewport()->unsetCursor();
event->accept();
return;
}
QGraphicsView::mouseReleaseEvent(event);
}
void GraphicsView::keyPressEvent(QKeyEvent *event)
{
if (event->key() == Qt::Key_Space) {
m_space = true;
viewport()->setCursor(Qt::ClosedHandCursor);
event->accept();
}
QGraphicsView::keyPressEvent(event);
}
void GraphicsView::keyReleaseEvent(QKeyEvent *event)
{
if (event->key() == Qt::Key_Space) {
m_space = false;
viewport()->unsetCursor();
event->accept();
}
QGraphicsView::keyReleaseEvent(event);
}
void GraphicsView::wheelEvent(QWheelEvent *event)
{
const int zoomDirection = event->angleDelta().y();
if (zoomDirection > 0 && canZoomIn()) {
if (m_redirectZoom) {
emit scaleIn();
} else {
zoomIn();
}
} else if (zoomDirection < 0 && canZoomOut()) {
if (m_redirectZoom) {
emit scaleOut();
} else {
zoomOut();
}
}
#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
centerOn(mapToScene(event->position().toPoint()));
#else
centerOn(mapToScene(event->pos()));
#endif
event->accept();
}
void GraphicsView::setRedirectZoom(const bool value)
{
m_redirectZoom = value;
}
void GraphicsView::setFastMode(const bool fastMode)
{
setRenderHint(QPainter::Antialiasing, !fastMode);
setRenderHint(QPainter::TextAntialiasing, !fastMode);
setRenderHint(QPainter::SmoothPixmapTransform, !fastMode);
}
void GraphicsView::zoomIn()
{
scale(1.25, 1.25);
++m_zoomLevel;
emit zoomChanged();
}
void GraphicsView::zoomOut()
{
scale(0.8, 0.8);
m_zoomLevel--;
emit zoomChanged();
}
void GraphicsView::resetZoom()
{
resetTransform();
m_zoomLevel = 0;
emit zoomChanged();
}
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