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Invalidate() method does not invoke OCM_DRAWITEM handler

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 : ....
    // Handle remaining OCM_xxxx messages
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)

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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