Scrollbar.h

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#pragma once
 
#include "Component.h"
 
class ScrollbarListener
{
public:
 
    virtual void scrollBarActivity(__int64 firstVisibleItem) = 0;
    virtual void scrollBarRepaint() = 0;
};
 
class Scrollbar
{
    Bounds _sbRect, _thumbRect, _upArrowRect, _downArrowRect;
    __int64 _totalItemCount;
    __int64 _firstVisibleItem;
    long _pageSize;
 
    wstring _orientation;            
 
    ScrollbarListener* _listener;
 
    wstring _clickedButton;
    long _thumbLastHitY;
 
    HDWP _hDwp;
 
private:
 
    void thumbPosToRow(int thumbPos);
 
public:
 
    Scrollbar();
    virtual ~Scrollbar();
 
    void setOrientation(const wstring& orientation = L"VERT");
 
    long getVScrollbarWidth();
    long getHScrollbarHeight();
 
    void paint(Graphics* g, const Bounds& rect, __int64 totalItemCount, __int64 firstVisibleItem, long maxVisibleItems);
 
    BOOL onMousePressed(WinHandle hWnd, int x, int y, int clickCount, BOOL shiftPressed, BOOL ctrlPressed);
    BOOL onMouseReleased(WinHandle hWnd, int x, int y, BOOL shiftPressed, BOOL ctrlPressed);
    BOOL onMouseMoved(WinHandle hWnd, int x, int y, BOOL shiftPressed, BOOL ctrlPressed);
 
    void addListener(ScrollbarListener* l);
};