{

DECLARE_CLASS_SIMPLE( ScrollBar, Panel );

public:

ScrollBar(Panel *parent, const char *panelName, bool vertical);

virtual ~ScrollBar() {}

// Set the value of the scroll bar slider.

virtual void SetValue(int value);

// Get the value of the scroll bar slider.

virtual int GetValue();

// Set the rangeof numbers the slider can scroll through

virtual void SetRange(int min,int max);

virtual void GetRange(int &min, int &max);

// Set how many lines are displayed at one time

// in the window the scroll bar is attached to.

virtual void SetRangeWindow(int rangeWindow);

// Get how many lines are displayed at one time

// in the window the scroll bar is attached to.

virtual int GetRangeWindow();

// Check if the scrollbar is vertical or horizontal

virtual bool IsVertical();

// Purpose: Check if the slider can move through one or more pixels per

// unit of its range.

virtual bool HasFullRange();

// Setup the indexed scroll bar button with the input params.

virtual void SetButton(Button* button,int index);

// Return the indexed scroll bar button

virtual Button *GetButton(int index);

// Set up the slider.

virtual void SetSlider(ScrollBarSlider* slider);

// Return a pointer to the slider.

virtual ScrollBarSlider *GetSlider();

// Set how far the scroll bar slider moves

// when a scroll bar button is pressed

virtual void SetButtonPressedScrollValue(int value);

virtual void Validate();

// Update and look for clicks when mouse is in the scroll bar window.

virtual void OnMouseFocusTicked();

// Set the slider's Paint border enabled.

virtual void SetPaintBorderEnabled(bool state);

// Set the slider's Paint background enabled.

virtual void SetPaintBackgroundEnabled(bool state);

// Set the slider's Paint enabled.

virtual void SetPaintEnabled(bool state);

// Sets the scrollbar buttons visible or not

virtual void SetScrollbarButtonsVisible(bool visible);

void SetAutohideButtons( bool bAutohide ) { m_bAutoHideButtons = bAutohide; }

void UseImages( const char *pszUpArrow, const char *pszDownArrow, const char *pszLine, const char *pszBox );

/* MESSAGES SENT:

"ScrollBarSliderMoved"

"position" - new value of the slider

*/

void SetOverriddenButtons( Button *pB1, Button *pB2 ) { m_pOverriddenButtons[0] = pB1; m_pOverriddenButtons[1] = pB2; }

virtual void ApplySettings( KeyValues *pInResourceData );

protected:

virtual void PerformLayout();

virtual void SendSliderMoveMessage(int value);

virtual void ApplySchemeSettings(IScheme *pScheme);

virtual void OnSizeChanged(int wide, int tall);

MESSAGE_FUNC_INT( OnSliderMoved, "ScrollBarSliderMoved", position );

virtual void RespondToScrollArrow(int const direction);

virtual void UpdateButtonsForImages( void );

virtual void UpdateSliderImages( void );

Button *GetDepressedButton( int iIndex );

private:

Button* _button[2];

ScrollBarSlider* _slider;

int _buttonPressedScrollValue;

int _scrollDelay; // used to control delays in scrolling

bool _respond;

bool m_bNoButtons;

CPanelAnimationVar( bool, m_bAutoHideButtons, "autohide_buttons", "0" );

vgui::ImagePanel *m_pUpArrow;

vgui::ImagePanel *m_pLine;

vgui::ImagePanel *m_pDownArrow;

vgui::ImagePanel *m_pBox;

Button *m_pOverriddenButtons[2];