Capture.h

#ifndef CAPTURE_H
#define CAPTURE_H

#include <map>

class Capture
{
public:
    Capture(void* winId);
    ~Capture();

    void init();
    bool ok() {return _ok;}

    LRESULT CALLBACK wndProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
    static LRESULT CALLBACK s_wndProc( HWND hWnd, UINT, WPARAM, LPARAM );
    static std::map <void*, Capture*> registry;

    virtual void OnLButtonDown(UINT flags, int x, int y) {}
    virtual void OnMButtonDown(UINT flags, int x, int y) {}
    virtual void OnRButtonDown(UINT flags, int x, int y) {}
    virtual void OnLButtonUp(UINT flags, int x, int y) {}
    virtual void OnMButtonUp(UINT flags, int x, int y) {}
    virtual void OnRButtonUp(UINT flags, int x, int y) {}
    virtual void OnMouseMove(UINT flags, int x, int y) {}

protected:
    bool _ok;
    void* _winId; // often a winId is needed when accessing an input device

private:
    WNDPROC _oldWndProc;
};

#endif  // CAPTURE_H