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#include "tagview.h"
#include <QWheelEvent>
#include <QScrollBar>
#include <cmath>
TagView::TagView(QWidget *parent)
: QGraphicsView(parent)
, saveCenterTimer(this)
{
setDragMode(QGraphicsView::ScrollHandDrag);
setScene(&m_scene);
connect(&m_scene, &TagScene::tagDoubleClicked, this, &TagView::tagDoubleClicked);
connect(&m_scene, &TagScene::imageLoaded, this, &TagView::zoomToFit);
saveCenterTimer.setSingleShot(true);
saveCenterTimer.setInterval(500);
connect(&saveCenterTimer, &QTimer::timeout, this, &TagView::saveCenter);
}
TagView::~TagView()
{
were_done = true;
}
void TagView::zoomToFit()
{
QTransform tx = QTransform().rotate(-rotation);
QRectF rect = tx.mapRect(m_scene.itemsBoundingRect());
QRectF vp = viewport()->rect();
setZoom(qMin(vp.width()/rect.width(), vp.height()/rect.height()));
centerOn(m_scene.backgroundPixmapItem());
qDebug() << "TagView::zoomToFit():" << sceneRect() << rect << viewport()->rect();
}
void TagView::setZoom(qreal zoom)
{
this->zoom = zoom;
if (m_proj)
m_proj->setMeta("view_zoom", zoom);
setTransform(QTransform::fromScale(zoom, zoom).rotate(rotation));
}
void TagView::zoomIn(qreal delta)
{
setZoom(qMax(1.0/16, qMin(4.0, zoom * qPow(1.2, delta/120))));
}
void TagView::rotate(int angle)
{
QGraphicsView::rotate(angle);
int tmp = (rotation + angle) % 360;
if (tmp < 0)
tmp += 360;
rotation = tmp;
if (m_proj)
m_proj->setMeta("view_rotation", rotation);
}
void TagView::setProject(SQLiteSaveFile *proj)
{
m_proj = proj;
m_scene.setProject(m_proj);
restoreViewport();
}
void TagView::wheelEvent(QWheelEvent *evt)
{
if (evt->modifiers() == Qt::ControlModifier) {
zoomIn(evt->angleDelta().y());
} else {
if (qAbs(evt->angleDelta().x()) > qAbs(evt->angleDelta().y())) {
QCoreApplication::sendEvent(horizontalScrollBar(), evt);
} else {
QCoreApplication::sendEvent(verticalScrollBar(), evt);
}
}
}
void TagView::scrollContentsBy(int dx, int dy)
{
QGraphicsView::scrollContentsBy(dx, dy);
/* Hackety hack: On object destruction this method is called downstream in the destructor chain. Prevent segfaults from calling an uninitialized timer. */
if (!were_done)
saveCenterTimer.start();
}
void TagView::saveCenter()
{
QPointF p = mapToScene(viewport()->rect().center());
if (m_proj)
m_proj->setMeta("view_center", QJsonDocument(QJsonArray({p.x(), p.y()})).toJson());
}
void TagView::restoreViewport()
{
if (!m_proj)
return;
QVariant v_rot = m_proj->getMeta("view_rotation");
if (v_rot.isValid()) {
rotation = v_rot.toInt();
} else {
rotation = 0;
}
QVariant v_zoom = m_proj->getMeta("view_zoom");
if (v_zoom.isValid()) {
zoom = v_zoom.toDouble();
setTransform(QTransform::fromScale(zoom, zoom).rotate(rotation));
} else {
zoomToFit();
}
QVariant v_center = m_proj->getMeta("view_center");
if (v_center.isValid()) {
QJsonArray arr = QJsonDocument::fromJson(v_center.toByteArray()).toVariant().toJsonArray();
assert(arr.size() == 2);
assert(arr[0].isDouble() && arr[1].isDouble());
centerOn(QPointF(arr[0].toDouble(), arr[1].toDouble()));
} else {
centerOn(m_scene.itemsBoundingRect().center());
}
}
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