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#include "tagview.h"
#include <QWheelEvent>
#include <QScrollBar>
#include <cmath>
TagView::TagView(SQLiteSaveFile &proj)
: proj(proj)
, saveCenterTimer()
{
setDragMode(QGraphicsView::ScrollHandDrag);
setScene(&scene);
saveCenterTimer.setSingleShot(true);
saveCenterTimer.setInterval(500);
connect(&saveCenterTimer, &QTimer::timeout,
this, &TagView::saveCenter);
}
void TagView::zoomToFit()
{
QTransform tx = QTransform().rotate(-rotation);
QRectF rect = tx.mapRect(scene.itemsBoundingRect());
QRectF vp = viewport()->rect();
setZoom(qMin(vp.width()/rect.width(), vp.height()/rect.height()));
}
void TagView::setZoom(qreal zoom)
{
this->zoom = zoom;
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;
proj.setMeta("view_rotation", rotation);
}
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::saveCenter()
{
QPointF p = mapToScene(viewport()->rect().center());
proj.setMeta("view_center", QJsonDocument(QJsonArray({p.x(), p.y()})).toJson());
}
void TagView::restoreViewport()
{
QVariant v_rot = proj.getMeta("view_rotation");
if (v_rot.isValid()) {
rotation = v_rot.toInt();
} else {
rotation = 0;
}
QVariant v_zoom = proj.getMeta("view_zoom");
if (v_zoom.isValid()) {
zoom = v_zoom.toDouble();
setTransform(QTransform::fromScale(zoom, zoom).rotate(rotation));
} else {
zoomToFit();
}
QVariant v_center = 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(scene.itemsBoundingRect().center());
}
}
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