Basic model/view action works

1 files changed, 43 insertions, 16 deletions

diff --git a/tagview.cpp b/tagview.cpp
index b4e83dd..9a9c9a0 100644
--- a/tagview.cpp
+++ b/tagview.cpp
@@ -4,34 +4,41 @@
 #include <QScrollBar>
 #include <cmath>
 
-TagView::TagView(SQLiteSaveFile &proj)
-    : scene(proj)
-    , proj(proj)
-    , saveCenterTimer()
+TagView::TagView(QWidget *parent)
+    : QGraphicsView(parent)
+    , saveCenterTimer(this)
 {
     setDragMode(QGraphicsView::ScrollHandDrag);
-    setScene(&scene);
-    connect(&scene, &TagScene::tagDoubleClicked, this, &TagView::tagDoubleClicked);
+    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);
+    connect(&saveCenterTimer, &QTimer::timeout, this, &TagView::saveCenter);
+}
+
+TagView::~TagView()
+{
+    were_done = true;
 }
 
 void TagView::zoomToFit()
 {
     QTransform tx = QTransform().rotate(-rotation);
-    QRectF rect = tx.mapRect(scene.itemsBoundingRect());
+    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;
-    proj.setMeta("view_zoom", zoom);
+    if (m_proj)
+        m_proj->setMeta("view_zoom", zoom);
     setTransform(QTransform::fromScale(zoom, zoom).rotate(rotation));
 }
 
@@ -47,7 +54,15 @@ void TagView::rotate(int angle)
     if (tmp < 0)
         tmp += 360;
     rotation = tmp;
-    proj.setMeta("view_rotation", rotation);
+    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)
@@ -63,22 +78,34 @@ void TagView::wheelEvent(QWheelEvent *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());
-    proj.setMeta("view_center", QJsonDocument(QJsonArray({p.x(), p.y()})).toJson());
+    if (m_proj)
+        m_proj->setMeta("view_center", QJsonDocument(QJsonArray({p.x(), p.y()})).toJson());
 }
 
 void TagView::restoreViewport()
 {
-    QVariant v_rot = proj.getMeta("view_rotation");
+    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 = proj.getMeta("view_zoom");
+    QVariant v_zoom = m_proj->getMeta("view_zoom");
     if (v_zoom.isValid()) {
         zoom = v_zoom.toDouble();
         setTransform(QTransform::fromScale(zoom, zoom).rotate(rotation));
@@ -86,13 +113,13 @@ void TagView::restoreViewport()
         zoomToFit();
     }
 
-    QVariant v_center = proj.getMeta("view_center");
+    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(scene.itemsBoundingRect().center());
+        centerOn(m_scene.itemsBoundingRect().center());
     }
 }