Add functions to add the start time of each subtitle line as snaps

src/bin/model/subtitlemodel.cpp

@@ -6,6 +6,7 @@
 SubtitleModel::SubtitleModel(std::weak_ptr<DocUndoStack> undo_stack, QObject *parent)
     : QAbstractListModel(parent)
     , m_undoStack(std::move(undo_stack))
+    , m_lock(QReadWriteLock::Recursive)
 {
 }
 
@@ -190,6 +191,7 @@ void SubtitleModel::addSubtitle(GenTime start, GenTime end, QString str)
     model->beginInsertRows(QModelIndex(), insertRow, insertRow);
     model->m_subtitleList[start] = {str, end};
     model->endInsertRows();
+    model->addSnapPoint(start);
 }
 
 QHash<int, QByteArray> SubtitleModel::roleNames() const 
@@ -243,4 +245,34 @@ QList<SubtitledTime> SubtitleModel::getAllSubtitles() const
         subtitle << s;
     }
     return subtitle;
+}
+
+void SubtitleModel::registerSnap(const std::weak_ptr<SnapInterface> &snapModel)
+{
+    // make sure ptr is valid
+    if (auto ptr = snapModel.lock()) {
+        // ptr is valid, we store it
+        m_regSnaps.push_back(snapModel);
+
+        for (const auto &subtitle : m_subtitleList) {
+            qDebug() << " REGISTERING SUBTITLE: " << subtitle.first.frames(pCore->getCurrentFps());
+            ptr->addPoint(subtitle.first.frames(pCore->getCurrentFps()));
+        }
+    } else {
+        qDebug() << "Error: added snapmodel for subtitle is null";
+        Q_ASSERT(false);
+    }
+}
+
+void SubtitleModel::addSnapPoint(GenTime startpos)
+{
+    std::vector<std::weak_ptr<SnapInterface>> validSnapModels;
+    for (const auto &snapModel : m_regSnaps) {
+        if (auto ptr = snapModel.lock()) {
+            validSnapModels.push_back(snapModel);
+            ptr->addPoint(startpos.frames(pCore->getCurrentFps()));
+        }
+    }
+    // Update the list of snapModel known to be valid
+    std::swap(m_regSnaps, validSnapModels);
 }
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src/bin/model/subtitlemodel.hpp

@@ -15,6 +15,7 @@
 #include <mlt++/MltProperties.h>
 
 class DocUndoStack;
+class SnapInterface;
 class AssetParameterModel;
 
 /* @brief This class is the model for a list of subtitles.
@@ -39,18 +40,26 @@ public:
 
     /** @brief Returns all subtitles in the model */
     QList<SubtitledTime> getAllSubtitles() const;
-    
+
+    /** @brief Registers a snap model to the subtitle model */
+    void registerSnap(const std::weak_ptr<SnapInterface> &snapModel);
+
 private:
     std::weak_ptr<DocUndoStack> m_undoStack;
     std::map<GenTime, std::pair<QString, GenTime>> m_subtitleList;
     //To get subtitle file from effects parameter:
     //std::unique_ptr<Mlt::Properties> m_asset;
     //std::shared_ptr<AssetParameterModel> m_model;
+    
+    std::vector<std::weak_ptr<SnapInterface>> m_regSnaps;
+    mutable QReadWriteLock m_lock;
 
 protected:
     /** @brief Helper function that retrieves a pointer to the subtitle model*/
     static std::shared_ptr<SubtitleModel> getModel();
-    
+    /** @brief Add start time as snap in the registered snap model */
+    void addSnapPoint(GenTime startpos);
+
 };
 Q_DECLARE_METATYPE(SubtitleModel *)
 #endif // SUBTITLEMODEL_HPP
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