Function UpdateJoystickMenu

source/common/menu/joystickmenu.cpp:157–231

void UpdateJoystickMenu(IJoystickConfig *selected)
{
	DMenuDescriptor **desc = MenuDescriptors.CheckKey(NAME_JoystickOptions);
	DMenuDescriptor **ddesc = MenuDescriptors.CheckKey("JoystickOptionsDefaults");
	if (ddesc == nullptr) return;	// without any data the menu cannot be set up and must remain empty.
	if (desc != NULL && (*desc)->IsKindOf(RUNTIME_CLASS(DOptionMenuDescriptor)))
	{
		DOptionMenuDescriptor *opt = (DOptionMenuDescriptor *)*desc;
		DOptionMenuDescriptor *dopt = (DOptionMenuDescriptor *)*ddesc;
		if (dopt == nullptr) return;
		DMenuItemBase *it;

		int i;
		int itemnum = -1;

		I_GetJoysticks(Joysticks);
		if ((unsigned)itemnum >= Joysticks.Size())
		{
			itemnum = Joysticks.Size() - 1;
		}
		if (selected != NULL)
		{
			for (i = 0; (unsigned)i < Joysticks.Size(); ++i)
			{
				if (Joysticks[i] == selected)
				{
					itemnum = i;
					break;
				}
			}
		}
		opt->mItems = dopt->mItems;

		it = opt->GetItem("ConfigureMessage");
		if (it != nullptr) it->SetValue(0, !!Joysticks.Size());
		it = opt->GetItem("ConnectMessage1");
		if (it != nullptr) it->SetValue(0, !use_joystick);
		it = opt->GetItem("ConnectMessage2");
		if (it != nullptr) it->SetValue(0, !use_joystick);

		for (int ii = 0; ii < (int)Joysticks.Size(); ++ii)
		{
			it = CreateOptionMenuItemJoyConfigMenu(Joysticks[ii]->GetName().GetChars(), Joysticks[ii]);
			GC::WriteBarrier(opt, it);
			opt->mItems.Push(it);
			if (ii == itemnum) opt->mSelectedItem = opt->mItems.Size();
		}
		if (opt->mSelectedItem >= (int)opt->mItems.Size())
		{
			opt->mSelectedItem = opt->mItems.Size() - 1;
		}
		//opt->CalcIndent();

		// If the joystick config menu is open, close it if the device it's open for is gone.
		if (CurrentMenu != nullptr && (CurrentMenu->IsKindOf("JoystickConfigMenu")))
		{
			auto p = CurrentMenu->PointerVar<IJoystickConfig>("mJoy");
			if (p != nullptr)