98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
#include "tagview.h"
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#include <QWheelEvent>
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#include <QScrollBar>
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#include <cmath>
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TagView::TagView(SQLiteSaveFile &proj)
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: scene(proj)
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, proj(proj)
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, saveCenterTimer()
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{
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setDragMode(QGraphicsView::ScrollHandDrag);
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setScene(&scene);
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connect(&scene, &TagScene::tagDoubleClicked, this, &TagView::tagDoubleClicked);
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saveCenterTimer.setSingleShot(true);
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saveCenterTimer.setInterval(500);
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connect(&saveCenterTimer, &QTimer::timeout,
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this, &TagView::saveCenter);
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}
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void TagView::zoomToFit()
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{
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QTransform tx = QTransform().rotate(-rotation);
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QRectF rect = tx.mapRect(scene.itemsBoundingRect());
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QRectF vp = viewport()->rect();
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setZoom(qMin(vp.width()/rect.width(), vp.height()/rect.height()));
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}
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void TagView::setZoom(qreal zoom)
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{
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this->zoom = zoom;
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proj.setMeta("view_zoom", zoom);
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setTransform(QTransform::fromScale(zoom, zoom).rotate(rotation));
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}
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void TagView::zoomIn(qreal delta)
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{
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setZoom(qMax(1.0/16, qMin(4.0, zoom * qPow(1.2, delta/120))));
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}
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void TagView::rotate(int angle)
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{
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QGraphicsView::rotate(angle);
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int tmp = (rotation + angle) % 360;
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if (tmp < 0)
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tmp += 360;
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rotation = tmp;
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proj.setMeta("view_rotation", rotation);
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}
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void TagView::wheelEvent(QWheelEvent *evt)
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{
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if (evt->modifiers() == Qt::ControlModifier) {
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zoomIn(evt->angleDelta().y());
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} else {
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if (qAbs(evt->angleDelta().x()) > qAbs(evt->angleDelta().y())) {
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QCoreApplication::sendEvent(horizontalScrollBar(), evt);
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} else {
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QCoreApplication::sendEvent(verticalScrollBar(), evt);
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}
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}
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}
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void TagView::saveCenter()
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{
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QPointF p = mapToScene(viewport()->rect().center());
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proj.setMeta("view_center", QJsonDocument(QJsonArray({p.x(), p.y()})).toJson());
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}
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void TagView::restoreViewport()
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{
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QVariant v_rot = proj.getMeta("view_rotation");
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if (v_rot.isValid()) {
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rotation = v_rot.toInt();
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} else {
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rotation = 0;
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}
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QVariant v_zoom = proj.getMeta("view_zoom");
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if (v_zoom.isValid()) {
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zoom = v_zoom.toDouble();
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setTransform(QTransform::fromScale(zoom, zoom).rotate(rotation));
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} else {
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zoomToFit();
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}
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QVariant v_center = proj.getMeta("view_center");
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if (v_center.isValid()) {
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QJsonArray arr = QJsonDocument::fromJson(v_center.toByteArray()).toVariant().toJsonArray();
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assert(arr.size() == 2);
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assert(arr[0].isDouble() && arr[1].isDouble());
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centerOn(QPointF(arr[0].toDouble(), arr[1].toDouble()));
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} else {
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centerOn(scene.itemsBoundingRect().center());
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}
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}
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