gzdoom/wadsrc/static/zscript/menu/menu.txt

enum EMenuKey
{
	MKEY_Up,
	MKEY_Down,
	MKEY_Left,
	MKEY_Right,
	MKEY_PageUp,
	MKEY_PageDown,
	MKEY_Enter,
	MKEY_Back,
	MKEY_Clear,
	NUM_MKEYS,

	// These are not buttons but events sent from other menus 

	MKEY_Input,
	MKEY_Abort,
	MKEY_MBYes,
	MKEY_MBNo,
}

class Menu : Object native
{
	//native static int MenuTime();
	
	native virtual bool MenuEvent (int mkey, bool fromcontroller);
	
	void MenuSound(Sound snd)
	{
		S_Sound (snd, CHAN_VOICE | CHAN_UI, snd_menuvolume, ATTN_NONE);
	}
	
}

class MenuDescriptor : Object native
{
	native Name mMenuName;
	native String mNetgameMessage;
	native Class<Menu> mClass;
}

class MenuItemBase : object native
{
	native int mXpos, mYpos;
	native Name mAction;
	native bool mEnabled;
	
	// making this virtual now would require exporting all classes at once.
	native /*virtual*/ bool MenuEvent (int mkey, bool fromcontroller);
	
}

struct FOptionMenuSettings
{
	int mTitleColor;
	int mFontColor;
	int mFontColorValue;
	int mFontColorMore;
	int mFontColorHeader;
	int mFontColorHighlight;
	int mFontColorSelection;
	int mLinespacing;
}

class OptionMenuDescriptor : MenuDescriptor native
{
	native Array<OptionMenuItem> mItems;
	native String mTitle;
	native int mSelectedItem;
	native int mDrawTop;
	native int mScrollTop;
	native int mScrollPos;
	native int mIndent;
	native int mPosition;
	native bool mDontDim;

	//native void CalcIndent();
	//native OptionMenuItem GetItem(Name iname);
	void Reset()
	{
		// Reset the default settings (ignore all other values in the struct)
		mPosition = 0;
		mScrollTop = 0;
		mIndent = 0;
		mDontDim = 0;
	}
}

class OptionMenuItem : MenuItemBase native
{
	native String mLabel;
	native bool mCentered;
	
	//native void drawLabel(int indent, int y, EColorRange color, bool grayed = false);
}

class OptionMenu : Menu native
{
	native bool CanScrollUp;
	native bool CanScrollDown;
	native int VisBottom;
	native OptionMenuItem mFocusControl;
	native OptionMenuDescriptor mDesc;
}