qzdoom/wadsrc/static/zscript/menu/listmenu.txt

class ListMenuDescriptor : MenuDescriptor native
{
	native Array<ListMenuItem> mItems;
	native int mSelectedItem;
	native int mSelectOfsX;
	native int mSelectOfsY;
	native TextureID mSelector;
	native int mDisplayTop;
	native int mXpos, mYpos;
	native int mWLeft, mWRight;
	native int mLinespacing;	// needs to be stored for dynamically created menus
	native int mAutoselect;	// this can only be set by internal menu creation functions
	native Font mFont;
	native int mFontColor;
	native int mFontColor2;
	native bool mCenter;

	void Reset()
	{
		// Reset the default settings (ignore all other values in the struct)
		mSelectOfsX = 0;
		mSelectOfsY = 0;
		mSelector.SetInvalid();
		mDisplayTop = 0;
		mXpos = 0;
		mYpos = 0;
		mLinespacing = 0;
		mNetgameMessage = "";
		mFont = NULL;
		mFontColor = Font.CR_UNTRANSLATED;
		mFontColor2 = Font.CR_UNTRANSLATED;
	}
}

//=============================================================================
//
// list menu class runs a menu described by a DListMenuDescriptor
//
//=============================================================================

class ListMenu : Menu native 
{
	native ListMenuDescriptor mDesc;
	native MenuItemBase mFocusControl;

	virtual void Init(Menu parent = NULL, ListMenuDescriptor desc = NULL)
	{
		mParentMenu = parent;
		mDesc = desc;
		if (desc.mCenter)
		{
			int center = 160;
			for(int i=0; i < mDesc.mItems.Size(); i++)
			{
				int xpos = mDesc.mItems[i].GetX();
				int width = mDesc.mItems[i].GetWidth();
				int curx = mDesc.mSelectOfsX;

				if (width > 0 && mDesc.mItems[i].Selectable())
				{
					int left = 160 - (width - curx) / 2 - curx;
					if (left < center) center = left;
				}
			}
			for(int i=0;i<mDesc.mItems.Size(); i++)
			{
				int width = mDesc.mItems[i].GetWidth();

				if (width > 0)
				{
					mDesc.mItems[i].SetX(center);
				}
			}
		}
	}
	
	MenuItemBase GetItem(Name name)
	{
		for(int i = 0; i < mDesc.mItems.Size(); i++)
		{
			Name nm = mDesc.mItems[i].GetAction();
			if (nm == name) return mDesc.mItems[i];
		}
		return NULL;
	}
	
	//bool Responder (InputEventData ev);
	//bool MenuEvent (int mkey, bool fromcontroller);
	//bool MouseEvent(int type, int x, int y);
	//void Ticker ();
	//void Drawer ();
	
	override void SetFocus(MenuItemBase fc)
	{
		mFocusControl = fc;
	}
	override bool CheckFocus(MenuItemBase fc)
	{
		return mFocusControl == fc;
	}
	override void ReleaseFocus()
	{
		mFocusControl = NULL;
	}
}