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joshiparsu asked:

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Hi All,

I've created a WTL based owner drawn listview control. In case of receiving WM_VSCROLL message, I want to repaint the whole listview control so I call Invalidate() followed by UpdateWindow() in WM_VSCROLL message handler function.
class CListViewExClass : ....
{
...
...
    BEGIN_MSG_MAP(CListViewExClass)
 
    MESSAGE_HANDLER(OCM_DRAWITEM, OnReflectedDrawItem)
    MESSAGE_HANDLER(WM_VSCROLL, OnVScroll)
 
    // Handle remaining OCM_xxxx messages
    DEFAULT_REFLECTION_HANDLER()
END_MSG_MAP()
 
LRESULT OnReflectedDrawItem(UINT msg, WPARAM wParam, LPARAM lParam, BOOL& handled)
{
//
// Draw my list with customization
//
}
 
LRESULT OnVScroll(UINT msg, WPARAM wParam, LPARAM lParam, BOOL& isHandled)
{
    Invalidate();
    UpdateWindow();
}
};
I expected OnReflectedDrawItem() to be called when I call Invalidate() from OnVScroll(). But that does not happen.

Can someone help me to figure out what's wrong with my code.
Tags: WTL

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