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分享请问WM_DRAWITEM消息什么时候产生？
继承CListCtrl写了一个Listctrl的类，又重写了虚函数DrawItem，但是就是不知道WM_DRAWITEM消息是什么时候发出的即什么时候会激发此消息？
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Eleven 2011-12-12
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The WM_DRAWITEM message is sent to the parent window of an owner-drawn button, combo box, list box, or menu when a visual aspect of the button, combo box, list box, or menu has changed.
A window receives this message through its WindowProc function.
LVS_OWNERDRAWFIXED
The owner window can paint items in report view. The list-view control sends a WM_DRAWITEM message to paint each item; it does not send separate messages for each subitem. The iItemData member of the DRAWITEMSTRUCT structure contains the item data for the specified list-view item.
A window receives this message through its WindowProc function.
LVS_OWNERDRAWFIXED
The owner window can paint items in report view. The list-view control sends a WM_DRAWITEM message to paint each item; it does not send separate messages for each subitem. The iItemData member of the DRAWITEMSTRUCT structure contains the item data for the specified list-view item.
yayafu 2011-12-12
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当然是Listctrl需要重新绘制内容的时候了，如遮挡它的窗体移开，改变了Listctrl的内容等，都需要DrawItem
shen_wei 2011-12-12
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子类化 Clistctrl 在子类化中 继承OnDrawItem函数就可以了！！！
shen_wei 2011-12-12
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WM_DRAWITEM message.
UstbNo1_ball 2011-12-12
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我跟踪了CWnd::OnDrawItem函数，它是对WM_DRAWITEM消息的响应，然后沿着ReflectLastMsg(lpDrawItemStruct->hwndItem)->SendChildNotifyLastMsg(LRESULT* pResult)->CListCtrl::OnChildNotify->DrawItem((LPDRAWITEMSTRUCT)lParam)的顺序将消息反射给控件自身处理！由于最后的DrawItem是个虚函数，而这个虚函数在继承的ListCtrl类中有重载，因此进入重载部分处理！这样就完成了所谓的消息反射！
但是我不明白这个WM_DRAWITEM消息何时发出？
但是我不明白这个WM_DRAWITEM消息何时发出？
