Function stepperWheelInput

src/OpenLoco/src/Ui/WindowManager.cpp:1223–1262

Allow mouse wheel scrolling to manipulate stepper widgets and tool sizes

    // Allow mouse wheel scrolling to manipulate stepper widgets and tool sizes
    static bool stepperWheelInput(Window& w, WidgetIndex_t widgetIndex, int32_t wheel)
    {
        const auto stepperGroupIndex = getStepperGroupWidgetIndex(w, widgetIndex);
        if (!stepperGroupIndex.has_value())
        {
            return false;
        }

        const auto entryWidgetType = w.widgets[*stepperGroupIndex].type;
        if (entryWidgetType == WidgetType::wt_3)
        {
            auto expectedContent1 = Gfx::recolour(ImageIds::decrease_tool_area, Colour::white);
            auto expectedContent2 = Gfx::recolour(ImageIds::increase_tool_area, Colour::white);

            auto button1Image = w.widgets[*stepperGroupIndex + 1].image;
            auto button2Image = w.widgets[*stepperGroupIndex + 2].image;
            if (button1Image != expectedContent1 || button2Image != expectedContent2)
            {
                return false;
            }
        }
        else if (entryWidgetType == WidgetType::textbox)
        {
            auto button1StringId = w.widgets[*stepperGroupIndex + 1].text;
            auto button2StringId = w.widgets[*stepperGroupIndex + 2].text;
            if (button1StringId != StringIds::stepper_minus || button2StringId != StringIds::stepper_plus)
            {
                return false;
            }
        }

        const auto targetWidgetIndex = wheel < 0 ? *stepperGroupIndex + 2 : *stepperGroupIndex + 1;
        if (w.isDisabled(targetWidgetIndex))
        {
            return false;
        }

        w.callOnMouseDown(targetWidgetIndex, w.widgets[targetWidgetIndex].id);
        return true;
    }

    // 0x004C628E
    static bool windowWheelInput(Window& window, int wheel)