Implement simple scroll state handling

3 files changed, 31 insertions, 1 deletions

diff --git a/src/timeline2/TimelineModel.cpp b/src/timeline2/TimelineModel.cpp

index 46a33add..7a2edda4 100644
--- a/src/timeline2/TimelineModel.cpp
+++ b/src/timeline2/TimelineModel.cpp
@@ -625,3 +625,22 @@ TimelineModel::replyAction(QString id)
 
         emit ChatPage::instance()->messageReply(related);
 }
+
+int
+TimelineModel::idToIndex(QString id) const
+{
+        if (id.isEmpty())
+                return -1;
+        for (int i = 0; i < (int)eventOrder.size(); i++)
+                if (id == eventOrder[i])
+                        return i;
+        return -1;
+}
+
+QString
+TimelineModel::indexToId(int index) const
+{
+        if (index < 0 || index >= (int)eventOrder.size())
+                return "";
+        return eventOrder[index];
+}
diff --git a/src/timeline2/TimelineModel.h b/src/timeline2/TimelineModel.h

index b2481668..17f83323 100644
--- a/src/timeline2/TimelineModel.h
+++ b/src/timeline2/TimelineModel.h
@@ -81,6 +81,8 @@ struct DecryptionResult
 class TimelineModel : public QAbstractListModel
 {
         Q_OBJECT
+        Q_PROPERTY(
+          int currentIndex READ currentIndex WRITE setCurrentIndex NOTIFY currentIndexChanged)
 
 public:
         explicit TimelineModel(QString room_id, QObject *parent = 0);
@@ -112,6 +114,8 @@ public:
         Q_INVOKABLE QString escapeEmoji(QString str) const;
         Q_INVOKABLE void viewRawMessage(QString id) const;
         Q_INVOKABLE void replyAction(QString id);
+        Q_INVOKABLE int idToIndex(QString id) const;
+        Q_INVOKABLE QString indexToId(int index) const;
 
         void addEvents(const mtx::responses::Timeline &events);
         template<class T>
@@ -119,6 +123,12 @@ public:
 
 public slots:
         void fetchHistory();
+        void setCurrentIndex(int index)
+        {
+                currentId = indexToId(index);
+                emit currentIndexChanged(index);
+        }
+        int currentIndex() const { return idToIndex(currentId); }
 
 private slots:
         // Add old events at the top of the timeline.
@@ -129,6 +139,7 @@ signals:
         void oldMessagesRetrieved(const mtx::responses::Messages &res);
         void messageFailed(const std::string txn_id);
         void messageSent(const std::string txn_id, std::string event_id);
+        void currentIndexChanged(int index);
 
 private:
         DecryptionResult decryptEvent(
@@ -146,6 +157,7 @@ private:
         bool paginationInProgress = false;
 
         QHash<QString, QColor> userColors;
+        QString currentId;
 };
 
 template<class T>
diff --git a/src/timeline2/TimelineViewManager.cpp b/src/timeline2/TimelineViewManager.cpp

index 93a42543..8233d33e 100644
--- a/src/timeline2/TimelineViewManager.cpp
+++ b/src/timeline2/TimelineViewManager.cpp
@@ -14,7 +14,6 @@ TimelineViewManager::TimelineViewManager(QWidget *parent)
                                          0,
                                          "MtxEvent",
                                          "Can't instantiate enum!");
-
         view      = new QQuickView();
         container = QWidget::createWindowContainer(view, parent);
         container->setMinimumSize(200, 200);