Add placeholder timeline model

src/timeline2/TimelineModel.cpp

@@ -0,0 +1,47 @@
+#include "TimelineModel.h"
+
+#include "Utils.h"
+
+QHash<int, QByteArray>
+TimelineModel::roleNames() const
+{
+        return {
+          {Type, "type"},
+          {Body, "body"},
+          {FormattedBody, "formattedBody"},
+          {UserId, "userId"},
+          {UserName, "userName"},
+          {Timestamp, "timestamp"},
+        };
+}
+int
+TimelineModel::rowCount(const QModelIndex &parent) const
+{
+        Q_UNUSED(parent);
+        return (int)this->eventOrder.size();
+}
+
+QVariant
+TimelineModel::data(const QModelIndex &index, int role) const
+{
+        if (index.row() < 0 && index.row() >= (int)eventOrder.size())
+                return QVariant();
+
+        QString id = eventOrder[index.row()];
+
+        switch (role) {
+        case UserId:
+                return QVariant(QString(""));
+        default:
+                return QVariant();
+        }
+}
+
+QColor
+TimelineModel::userColor(QString id, QColor background)
+{
+        if (!userColors.count(id))
+                userColors.insert(
+                  {id, QColor(utils::generateContrastingHexColor(id, background.name()))});
+        return userColors.at(id);
+}