remove old messages when new ones come in to save resources

abaddon.cpp

@@ -410,7 +410,6 @@ void Abaddon::ActionDisconnect() {
     m_channels_history_loaded.clear();
     m_channels_history_loading.clear();
     m_channels_requested.clear();
-    m_oldest_listed_message.clear();
     m_main_window->set_title(APP_TITLE);
     m_main_window->UpdateComponents();
 }
@@ -455,9 +454,6 @@ void Abaddon::ActionChannelOpened(Snowflake id) {
     m_main_window->UpdateChatActiveChannel(id);
     if (m_channels_requested.find(id) == m_channels_requested.end()) {
         m_discord.FetchMessagesInChannel(id, [this, id](const std::vector<Snowflake> &msgs) {
-            if (msgs.size() > 0)
-                m_oldest_listed_message[id] = msgs.back();
-
             m_main_window->UpdateChatWindowContents();
             m_channels_requested.insert(id);
         });
@@ -495,13 +491,12 @@ void Abaddon::ActionChatLoadHistory(Snowflake id) {
 
     m_channels_history_loading.insert(id);
 
-    m_discord.FetchMessagesInChannelBefore(id, m_oldest_listed_message[id], [this, id](const std::vector<Snowflake> &msgs) {
+    m_discord.FetchMessagesInChannelBefore(id, before_id, [this, id](const std::vector<Snowflake> &msgs) {
         m_channels_history_loading.erase(id);
 
         if (msgs.size() == 0) {
             m_channels_history_loaded.insert(id);
         } else {
-            m_oldest_listed_message[id] = msgs.back();
             m_main_window->UpdateChatPrependHistory(msgs);
         }
     });

abaddon.hpp

@@ -116,10 +116,9 @@ private:
 
     DiscordClient m_discord;
     std::string m_discord_token;
-    // todo make these map snowflake to attribs
+
     std::unordered_set<Snowflake> m_channels_requested;
     std::unordered_set<Snowflake> m_channels_history_loaded;
-    std::unordered_map<Snowflake, Snowflake> m_oldest_listed_message;
     std::unordered_set<Snowflake> m_channels_history_loading;
 
     ImageManager m_img_mgr;

components/chatmessage.cpp

@@ -1148,6 +1148,10 @@ void ChatMessageHeader::UpdateNameColor() {
     m_author->set_markup(md);
 }
 
+std::vector<Gtk::Widget *> ChatMessageHeader::GetChildContent() {
+    return m_content_widgets;
+}
+
 void ChatMessageHeader::AttachUserMenuHandler(Gtk::Widget &widget) {
     widget.signal_button_press_event().connect([this](GdkEventButton *ev) -> bool {
         if (ev->type == GDK_BUTTON_PRESS && ev->button == GDK_BUTTON_SECONDARY) {
@@ -1177,6 +1181,10 @@ ChatMessageHeader::type_signal_action_open_user_menu ChatMessageHeader::signal_a
 }
 
 void ChatMessageHeader::AddContent(Gtk::Widget *widget, bool prepend) {
+    m_content_widgets.push_back(widget);
+    widget->signal_unmap().connect([this, widget]() {
+        m_content_widgets.erase(std::remove(m_content_widgets.begin(), m_content_widgets.end(), widget), m_content_widgets.end());
+    });
     m_content_box->add(*widget);
     if (prepend)
         m_content_box->reorder_child(*widget, 1);

components/chatmessage.hpp

@@ -110,12 +110,15 @@ public:
     ChatMessageHeader(const Message *data);
     void AddContent(Gtk::Widget *widget, bool prepend);
     void UpdateNameColor();
+    std::vector<Gtk::Widget*> GetChildContent();
 
 protected:
     void AttachUserMenuHandler(Gtk::Widget &widget);
 
     bool on_author_button_press(GdkEventButton *ev);
 
+    std::vector<Gtk::Widget*> m_content_widgets;
+
     Gtk::Box *m_main_box;
     Gtk::Box *m_content_box;
     Gtk::EventBox *m_content_box_ev;

components/chatwindow.cpp

@@ -110,6 +110,7 @@ void ChatWindow::SetMessages(const std::set<Snowflake> &msgs) {
     }
 
     m_num_rows = 0;
+    m_num_messages = 0;
     m_id_to_widget.clear();
 
     for (const auto &id : msgs) {
@@ -159,14 +160,7 @@ void ChatWindow::InsertChatInput(std::string text) {
 }
 
 Snowflake ChatWindow::GetOldestListedMessage() {
-    Snowflake m;
-
-    for (const auto &[id, widget] : m_id_to_widget) {
-        if (id < m)
-            m = id;
-    }
-
-    return m;
+    return m_id_to_widget.begin()->first;
 }
 
 void ChatWindow::UpdateReactions(Snowflake id) {
@@ -203,6 +197,7 @@ ChatMessageItemContainer *ChatWindow::CreateMessageComponent(Snowflake id) {
     return container;
 }
 
+constexpr static int MaxMessagesForCull = 50; // this has to be 50 cuz that magic number is used in a couple other places and i dont feel like replacing them
 void ChatWindow::ProcessNewMessage(Snowflake id, bool prepend) {
     const auto &client = Abaddon::Get().GetDiscordClient();
     if (!client.IsStarted()) return; // e.g. load channel and then dc
@@ -222,6 +217,24 @@ void ChatWindow::ProcessNewMessage(Snowflake id, bool prepend) {
                 should_attach = true;
     }
 
+    m_num_messages++;
+
+    if (m_should_scroll_to_bottom && !prepend)
+        while (m_num_messages > MaxMessagesForCull) {
+            auto first_it = m_id_to_widget.begin();
+            ChatMessageHeader *header = dynamic_cast<ChatMessageHeader *>(first_it->second->get_ancestor(Gtk::ListBoxRow::get_type()));
+            if (header != nullptr) {
+                if (header->GetChildContent().size() == 1)
+                    delete header;
+                else
+                    delete first_it->second;
+            } else
+                delete first_it->second;
+            m_id_to_widget.erase(first_it);
+            m_num_rows--;
+            m_num_messages--;
+        }
+
     ChatMessageHeader *header;
     if (should_attach) {
         header = last_row;

components/chatwindow.hpp

@@ -36,8 +36,9 @@ protected:
     void StartReplying(Snowflake message_id);
     void StopReplying();
 
+    int m_num_messages = 0;
     int m_num_rows = 0;
-    std::unordered_map<Snowflake, Gtk::Widget *> m_id_to_widget;
+    std::map<Snowflake, Gtk::Widget *> m_id_to_widget;
 
     Snowflake m_active_channel;