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#ifndef subclassmgr_h__
#define subclassmgr_h__
struct TSubclassData
{
WNDPROC oldWndProc;
LPARAM lParam;
};
typedef LRESULT (*TSubclassProc)(MSG *msg, TSubclassData *data);
class CSubclassMgr
{
public:
static void Subclass(HWND hwnd, TSubclassProc newWndProc, LPARAM lParam)
{
TWindowInfo *wi = new TWindowInfo;
wi->hwnd = hwnd;
wi->newWndProc = newWndProc;
wi->lParam = lParam;
Instance().m_windows.insert(wi);
wi->oldWndProc = (WNDPROC)SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR)GlobalSubclassProc);
}
private:
CSubclassMgr(): m_windows(5, TWindowInfo::Compare) {}
CSubclassMgr(const CSubclassMgr &);
CSubclassMgr &operator=(const CSubclassMgr &);
static CSubclassMgr &Instance()
{
static CSubclassMgr theInstance;
return theInstance;
}
struct TWindowInfo
{
HWND hwnd;
WNDPROC oldWndProc;
TSubclassProc newWndProc;
LPARAM lParam;
static int Compare(const TWindowInfo *p1, const TWindowInfo *p2)
{
return (int)p1->hwnd - (int)p2->hwnd;
}
};
OBJLIST<TWindowInfo> m_windows;
static LRESULT CALLBACK GlobalSubclassProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
TWindowInfo search = { hwnd };
TWindowInfo *wnd = Instance().m_windows.find(&search);
if (!wnd) return DefWindowProc(hwnd, message, wParam, lParam);
MSG msg = { hwnd, message, wParam, lParam };
TSubclassData data = { wnd->oldWndProc, wnd->lParam };
LRESULT result = wnd->newWndProc(&msg, &data);
if (message == WM_DESTROY)
{
SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR)wnd->oldWndProc);
Instance().m_windows.remove(wnd);
}
return result;
}
};
#endif // subclassmgr_h__
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