Method show

library/modules/Screen.cpp:490–519

static std::map<df::viewscreen*, Plugin*> plugin_screens;

bool Screen::show(std::unique_ptr<df::viewscreen> screen, df::viewscreen *before, Plugin *plugin)
{
    CHECK_NULL_POINTER(screen);
    CHECK_INVALID_ARGUMENT(!screen->parent && !screen->child);

    if (!gps || !gview) return false;

    df::viewscreen *parent = &gview->view;
    while (parent && parent->child != before)
        parent = parent->child;

    if (!parent) return false;

    gps->force_full_display_count += 2;

    screen->child = parent->child;
    screen->parent = parent;
    df::viewscreen* s = screen.release();
    parent->child = s;
    if (s->child)
        s->child->parent = s;

    if (dfhack_viewscreen::is_instance(s))
        static_cast<dfhack_viewscreen*>(s)->onShow();

    if (plugin)
        plugin_screens[s] = plugin;

    return true;
}

void Screen::dismiss(df::viewscreen *screen, bool to_first)
{