cartographer/marker_formspec.lua

-- Generates formspec data for the map marker editor
-- selected_id: The id of the currently selected marker, or nil if no marker is
--              selected
-- detail: The map's detail level
-- page: The current page
-- bg: A 9-slice background skin table
-- button: A button skin table
--
-- Returns a formspec string for use in containers
function _cartographer.generate_marker_formspec(selected_id, detail, page, bg, button)
    local fs = string.format("background9[0,0;3.25,3.875;%s.png;false;%s]", bg.texture, tostring(bg.radius))
            .. string.format("style_type[button,image_button;border=false;bgimg=%s.png;bgimg_hovered=%s.png;bgimg_pressed=%s.png;bgimg_middle=%s;textcolor=%s]", button.texture, button.hovered_texture, button.pressed_texture, tostring(button.radius), button.font_color)
            .. "button[0.125,0.125;1.125,0.5;clear_marker;Erase]";
    if selected_id then
        fs = fs .. string.format("style[marker-%s;bgimg=%s.png;bgimg_hovered=%s.png;bgimg_pressed=%s.png]", selected_id, button.selected_texture, button.selected_texture, button.selected_texture);
    end

    local starting_id = ((page - 1) * 20) + 1;
    for i = starting_id,math.min(#_cartographer.marker_lookup,starting_id + 19),1 do
        local marker = _cartographer.marker_lookup[i];
        fs = fs .. string.format("image_button[%f,%f;0.5,0.5;%s.png;marker-%s;]",
                                (i - starting_id) % 5 * 0.625 + 0.125,
                                math.floor((i - starting_id) / 5) * 0.625 + 0.75,
                                marker.textures[math.min(detail, #marker.textures)],
                                marker.id);
    end

    if page > 1 then
        fs = fs .. "button[0.125,3.25;0.5,0.5;prev_button;<]";
    end

    if starting_id + 19 < #_cartographer.marker_lookup then
        fs = fs .. "button[2.625,3.25;0.5,0.5;next_button;>]";
    end

    fs = fs .. string.format("label[1.375,3.5;%d / %d]", page, math.ceil(#_cartographer.marker_lookup / 20));
    return fs;
end