added colon emote popup for ffz and bttv

src/widgets/listview/GenericListModel.cpp

@@ -0,0 +1,51 @@
+#include "GenericListModel.hpp"
+
+namespace chatterino {
+
+GenericListModel::GenericListModel(QWidget *parent)
+    : QAbstractListModel(parent)
+{
+}
+
+int GenericListModel::rowCount(const QModelIndex &parent) const
+{
+    return this->items_.size();
+}
+
+QVariant GenericListModel::data(const QModelIndex &index, int /* role */) const
+{
+    if (!index.isValid())
+        return QVariant();
+
+    if (index.row() >= this->items_.size())
+        return QVariant();
+
+    auto item = this->items_[index.row()].get();
+    // See https://stackoverflow.com/a/44503822 .
+    return QVariant::fromValue(static_cast<void *>(item));
+}
+
+void GenericListModel::addItem(std::unique_ptr<GenericListItem> item)
+{
+    // {begin,end}InsertRows needs to be called to notify attached views
+    this->beginInsertRows(QModelIndex(), this->items_.size(),
+                          this->items_.size());
+    this->items_.push_back(std::move(item));
+    this->endInsertRows();
+}
+
+void GenericListModel::clear()
+{
+    if (this->items_.empty())
+        return;
+
+    // {begin,end}RemoveRows needs to be called to notify attached views
+    this->beginRemoveRows(QModelIndex(), 0, this->items_.size() - 1);
+
+    // clear
+    this->items_.clear();
+
+    this->endRemoveRows();
+}
+
+}  // namespace chatterino