Function MakeCompanyButtonRows

src/widget.cpp:3471–3514

* Make a number of rows with button-like graphics, for enabling/disabling each company. * @param widget_first The first widget index to use. * @param widget_last The last widget index to use. * @param colour The colour in which to draw the button. * @param max_length Maximal number of company buttons in one row. * @param button_tooltip The tooltip-string of every button. * @param resizable W

 * @return Panel with rows of company buttons.
 */
std::unique_ptr<NWidgetBase> MakeCompanyButtonRows(WidgetID widget_first, WidgetID widget_last, Colours button_colour, int max_length, StringID button_tooltip, bool resizable)
{
	assert(max_length >= 1);
	std::unique_ptr<NWidgetVertical> vert = nullptr; // Storage for all rows.
	std::unique_ptr<NWidgetHorizontal> hor = nullptr; // Storage for buttons in one row.
	int hor_length = 0;

	Dimension sprite_size = GetSpriteSize(SPR_COMPANY_ICON, nullptr, ZoomLevel::Normal);
	sprite_size.width  += WidgetDimensions::unscaled.matrix.Horizontal();
	sprite_size.height += WidgetDimensions::unscaled.matrix.Vertical();

	for (WidgetID widnum = widget_first; widnum <= widget_last; widnum++) {
		/* Ensure there is room in 'hor' for another button. */
		if (hor_length == max_length) {
			if (vert == nullptr) vert = std::make_unique<NWidgetVertical>();
			vert->Add(std::move(hor));
			hor = nullptr;
			hor_length = 0;
		}
		if (hor == nullptr) {
			hor = std::make_unique<NWidgetHorizontal>();
			hor_length = 0;
		}

		auto panel = std::make_unique<NWidgetBackground>(WWT_PANEL, button_colour, widnum);
		panel->SetMinimalSize(sprite_size.width, sprite_size.height);
		panel->SetFill(1, 1);
		if (resizable) panel->SetResize(1, 0);
		panel->SetToolTip(button_tooltip);
		hor->Add(std::move(panel));
		hor_length++;
	}
	if (vert == nullptr) return hor; // All buttons fit in a single row.

	if (hor_length > 0 && hor_length < max_length) {
		/* Last row is partial, add a spacer at the end to force all buttons to the left. */
		auto spc = std::make_unique<NWidgetSpacer>(sprite_size.width, sprite_size.height);
		spc->SetFill(1, 1);
		if (resizable) spc->SetResize(1, 0);
		hor->Add(std::move(spc));
	}
	if (hor != nullptr) vert->Add(std::move(hor));
	return vert;
}

/**
 * Unfocuses the focused widget of the window,