// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#pragma once

#include "IGUIElement.h"
#include "SColor.h"

namespace irr
{
namespace gui
{
class IGUISpriteBank;
class IGUIScrollBar;

//! Enumeration for listbox colors
enum EGUI_LISTBOX_COLOR
{
	//! Color of text
	EGUI_LBC_TEXT = 0,
	//! Color of selected text
	EGUI_LBC_TEXT_HIGHLIGHT,
	//! Color of icon
	EGUI_LBC_ICON,
	//! Color of selected icon
	EGUI_LBC_ICON_HIGHLIGHT,
	//! Not used, just counts the number of available colors
	EGUI_LBC_COUNT
};

//! Default list box GUI element.
/** \par This element can create the following events of type EGUI_EVENT_TYPE:
\li EGET_LISTBOX_CHANGED
\li EGET_LISTBOX_SELECTED_AGAIN
*/
class IGUIListBox : public IGUIElement
{
public:
	//! constructor
	IGUIListBox(IGUIEnvironment *environment, IGUIElement *parent, s32 id, core::rect<s32> rectangle) :
			IGUIElement(EGUIET_LIST_BOX, environment, parent, id, rectangle) {}

	//! returns amount of list items
	virtual u32 getItemCount() const = 0;

	//! returns string of a list item. the may id be a value from 0 to itemCount-1
	virtual const wchar_t *getListItem(u32 id) const = 0;

	//! adds an list item, returns id of item
	virtual u32 addItem(const wchar_t *text) = 0;

	//! adds an list item with an icon
	/** \param text Text of list entry
	\param icon Sprite index of the Icon within the current sprite bank. Set it to -1 if you want no icon
	\return The id of the new created item */
	virtual u32 addItem(const wchar_t *text, s32 icon) = 0;

	//! Removes an item from the list
	virtual void removeItem(u32 index) = 0;

	//! get the the id of the item at the given absolute coordinates
	/** \return The id of the list item or -1 when no item is at those coordinates*/
	virtual s32 getItemAt(s32 xpos, s32 ypos) const = 0;

	//! Returns the icon of an item
	virtual s32 getIcon(u32 index) const = 0;

	//! Sets the sprite bank which should be used to draw list icons.
	/** This font is set to the sprite bank of the built-in-font by
	default. A sprite can be displayed in front of every list item.
	An icon is an index within the icon sprite bank. Several
	default icons are available in the skin through getIcon. */
	virtual void setSpriteBank(IGUISpriteBank *bank) = 0;

	//! clears the list, deletes all items in the listbox
	virtual void clear() = 0;

	//! returns id of selected item. returns -1 if no item is selected.
	virtual s32 getSelected() const = 0;

	//! sets the selected item. Set this to -1 if no item should be selected
	virtual void setSelected(s32 index) = 0;

	//! sets the selected item. Set this to 0 if no item should be selected
	virtual void setSelected(const wchar_t *item) = 0;

	//! set whether the listbox should scroll to newly selected items
	virtual void setAutoScrollEnabled(bool scroll) = 0;

	//! returns true if automatic scrolling is enabled, false if not.
	virtual bool isAutoScrollEnabled() const = 0;

	//! set all item colors at given index to color
	virtual void setItemOverrideColor(u32 index, video::SColor color) = 0;

	//! set all item colors of specified type at given index to color
	virtual void setItemOverrideColor(u32 index, EGUI_LISTBOX_COLOR colorType, video::SColor color) = 0;

	//! clear all item colors at index
	virtual void clearItemOverrideColor(u32 index) = 0;

	//! clear item color at index for given colortype
	virtual void clearItemOverrideColor(u32 index, EGUI_LISTBOX_COLOR colorType) = 0;

	//! has the item at index its color overwritten?
	virtual bool hasItemOverrideColor(u32 index, EGUI_LISTBOX_COLOR colorType) const = 0;

	//! return the overwrite color at given item index.
	virtual video::SColor getItemOverrideColor(u32 index, EGUI_LISTBOX_COLOR colorType) const = 0;

	//! return the default color which is used for the given colorType
	virtual video::SColor getItemDefaultColor(EGUI_LISTBOX_COLOR colorType) const = 0;

	//! set the item at the given index
	virtual void setItem(u32 index, const wchar_t *text, s32 icon) = 0;

	//! Insert the item at the given index
	/** \return The index on success or -1 on failure. */
	virtual s32 insertItem(u32 index, const wchar_t *text, s32 icon) = 0;

	//! Swap the items at the given indices
	virtual void swapItems(u32 index1, u32 index2) = 0;

	//! set global itemHeight
	virtual void setItemHeight(s32 height) = 0;

	//! Sets whether to draw the background
	virtual void setDrawBackground(bool draw) = 0;

	//! Access the vertical scrollbar
	virtual IGUIScrollBar *getVerticalScrollBar() const = 0;
};

} // end namespace gui
} // end namespace irr
