Function MakeTreeTypeButtons

src/tree_gui.cpp:259–286

* Make widgets for the current available tree types. * This does not use a NWID_MATRIX or WWT_MATRIX control as those are more difficult to * get producing the correct result than dynamically building the widgets is. * @see NWidgetFunctionType */

 * @see NWidgetFunctionType
 */
static std::unique_ptr<NWidgetBase> MakeTreeTypeButtons()
{
	const uint8_t type_base = _tree_base_by_landscape[to_underlying(_settings_game.game_creation.landscape)];
	const uint8_t type_count = _tree_count_by_landscape[to_underlying(_settings_game.game_creation.landscape)];

	/* Toyland has 9 tree types, which look better in 3x3 than 4x3 */
	const int num_columns = type_count == 9 ? 3 : 4;
	const int num_rows = CeilDiv(type_count, num_columns);
	uint8_t cur_type = type_base;

	auto vstack = std::make_unique<NWidgetVertical>(NWidContainerFlag::EqualSize);
	vstack->SetPIP(0, 1, 0);

	for (int row = 0; row < num_rows; row++) {
		auto hstack = std::make_unique<NWidgetHorizontal>(NWidContainerFlag::EqualSize);
		hstack->SetPIP(0, 1, 0);
		for (int col = 0; col < num_columns; col++) {
			if (cur_type > type_base + type_count) break;
			auto button = std::make_unique<NWidgetBackground>(WWT_PANEL, COLOUR_GREY, WID_BT_TYPE_BUTTON_FIRST + cur_type);
			button->SetToolTip(STR_PLANT_TREE_TOOLTIP);
			hstack->Add(std::move(button));
			cur_type++;
		}
		vstack->Add(std::move(hstack));
	}

	return vstack;
}

static constexpr std::initializer_list<NWidgetPart> _nested_build_trees_widgets = {
	NWidget(NWID_HORIZONTAL),