//========= Copyright (c) 1996-2002, Valve LLC, All rights reserved. ============
//
// Purpose: 
//
// $NoKeywords: $
//=============================================================================
#pragma once
#ifndef VOICE_LISTBOX_H
#define VOICE_LISTBOX_H

#include "VGUI_Panel.h"
#include "VGUI_IntChangeSignal.h"

#include "vgui_slider2.h"
#include "vgui_scrollbar2.h"

namespace vgui
{
// Listbox class used by voice code. Based off of vgui's list panel but with some modifications:
// - This listbox clips its child items to its rectangle.
// - You can access things like the scrollbar and find out the item width.
// - The scrollbar scrolls one element at a time and the range is correct.

// Note: this listbox does not provide notification when items are 
class CListBox : public Panel
{
public:
	CListBox();
	~CListBox();

	void		Init();
	void		Term();

	// Add an item to the listbox. This automatically sets the item's parent to the listbox 
	// and resizes the item's width to fit within the listbox.
	void		AddItem( Panel *pPanel );

	// Get the number of items currently in the listbox.
	int		GetNumItems();

	// Get the width that listbox items will be set to (this changes if you resize the listbox).
	int		GetItemWidth();

	// Get/set the scrollbar position (position says which element is at the top of the listbox).
	int		GetScrollPos();
	void		SetScrollPos( int pos );

	// sets the last item the listbox should scroll to
	// scroll to GetNumItems() if not set
	void		SetScrollRange( int maxScroll );

	// returns the maximum value the scrollbar can scroll to
	int		GetScrollMax();

	// vgui overrides.
	virtual void	setPos( int x, int y );
	virtual void	setSize( int wide, int tall );
	virtual void	setPixelScroll( int value );
	virtual void	paintBackground();
protected:
	class LBItem
	{
	public:
		Panel	*m_pPanel;
		LBItem	*m_pPrev, *m_pNext;
	};

	class ListBoxSignal : public IntChangeSignal
	{
	public:
		void intChanged( int value, Panel *panel )
		{
			m_pListBox->setPixelScroll( -value );
		}

		vgui::CListBox	*m_pListBox;
	};

	void		InternalLayout();

	// All the items..
	LBItem		m_Items;

	Panel		m_ItemsPanel;

	int		m_ItemOffset;	// where we're scrolled to
	Slider2		m_Slider;
	ScrollBar2	m_ScrollBar;
	ListBoxSignal	m_Signal;

	int		m_iScrollMax;
};

}
#endif // VOICE_LISTBOX_H