Kordophone/src/application/main-window.vala

using Adw;
using Gtk;

public class MainWindow : Adw.ApplicationWindow
{
    private ConversationListView conversation_list_view;
    private MessageListView message_list_view;

    public MainWindow () {
        Object (title: "Kordophone");

        var split_view = new NavigationSplitView ();
        split_view.set_min_sidebar_width (400);
        set_content (split_view);

        conversation_list_view = new ConversationListView ();
        conversation_list_view.conversation_selected.connect (conversation_selected);

        var conversation_list_page = new NavigationPage (conversation_list_view, "Conversations");
        split_view.sidebar = conversation_list_page;

        message_list_view = new MessageListView (new MessageListModel ("123"));
        var message_list_page = new NavigationPage (message_list_view, "Messages");
        split_view.content = message_list_page;
    }

    private void conversation_selected(string? conversation_guid) {
        if (conversation_guid == null) {
            message_list_view.model = null;
        } else {
            message_list_view.model = new MessageListModel (conversation_guid);
        }
    }
}