Method OnPaint

src/industry_gui.cpp:837–850

	}

	void OnPaint() override
	{
		this->DrawWidgets();

		if (this->IsShaded()) return; // Don't draw anything when the window is shaded.

		const Rect r = this->GetWidget<NWidgetBase>(WID_IV_INFO)->GetCurrentRect();
		int expected = this->DrawInfo(r);
		if (expected != r.bottom) {
			this->info_height = expected - r.top + 1;
			this->ReInit();
			return;
		}
	}

	void DrawCargoIcon(const Rect &r, CargoType cargo_type) const
	{