Re: listview with control child

"Igor Tandetnik" <>
Wed, 3 Jan 2007 12:32:18 -0500
PaulH <> wrote:

I have a listview with a child control that sits on a row.

When I left click on the child control, I want it to send the
notification back to the list view so that it selects the row as
though I had just clicked on a normal listview element. So, I handled
the WM_LBUTTONDOWN message in the child control to repost the message
to its parent (the listview) as below:

   LRESULT OnLButtonDown(UINT uMsg,
                         WPARAM wParam,
                         LPARAM lParam,
                         BOOL& /*bHandled*/)
       POINT pt = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
       MapWindowPoints(GetParent(), &pt, 1);
       LPARAM lp = MAKEWORD(pt.x, pt.y);

That should be MAKELPARAM. MAKEWORD builds a 16-bit value out of two
8-bit parts.

       return GetParent().SendMessage(uMsg, wParam, lp);

But, instead of just selecting that row, the listview treats it as the
x,y coordinate of a selection box that starts in the top-right corner
of the listview and goes to the mouse pointer.

That's because MAKEWORD leaves the high-order word (the Y coordinate)
With best wishes,
    Igor Tandetnik

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