在WTL::CListViewCtrl控件实现Tooltip显示的实例：
1. 从CListViewCtrl类重载，创建CTooltipCtrl控件，处理鼠标事件。
重载类头文件：
class CListViewCtrlTip : public CWindowImpl<CListViewCtrlTip, CListViewCtrl>
{
public:
CListViewCtrlTip()
{
m_nCurItem = -1;
m_dwCurItemData = 0;
}
BEGIN_MSG_MAP(CListViewCtrlTip)
MESSAGE_RANGE_HANDLER(WM_MOUSEFIRST, WM_MOUSELAST, OnMouseMessage)
MESSAGE_HANDLER(WM_MOUSEMOVE, OnMouseMove)
END_MSG_MAP()
LRESULT OnMouseMessage(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
LRESULT OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
void Attach(HWND hWnd);
void Detach();
void DeactivateTip();
int GetCurItem()
{
return m_nCurItem;
}
DWORD GetCurItemData()
{
return m_dwCurItemData;
}
private:
CToolTipCtrl m_ctrlTip;
int m_nCurItem;
DWORD m_dwCurItemData;
};
重载类实现：
void CListViewCtrlTip::Attach(HWND hWnd)
{
// Use subclass window to support message event instead of attach
if (CWindowImpl<CListViewCtrlTip, CListViewCtrl>::SubclassWindow(hWnd))
{
m_ctrlTip.Create(m_hWnd);
m_ctrlTip.Activate(FALSE);
m_ctrlTip.AddTool(m_hWnd);
m_ctrlTip.SetMaxTipWidth(260); // Set the max tip width to 260 characters
m_ctrlTip.SetDelayTime(TTDT_AUTOPOP, 10000); // Set auto pop delay time to 10s
}
}
void CListViewCtrlTip::Detach()
{
if (::IsWindow(m_hWnd))
{
m_ctrlTip.Activate(FALSE);
m_ctrlTip.DelTool(m_hWnd);
CWindowImpl<CListViewCtrlTip, CListViewCtrl>::UnsubclassWindow(TRUE);
}
}
void CListViewCtrlTip::DeactivateTip()
{
m_nCurItem = -1;
m_dwCurItemData = 0;
m_ctrlTip.Activate(FALSE);
}
LRESULT CListViewCtrlTip::OnMouseMessage(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
MSG msg = { m_hWnd, uMsg, wParam, lParam };
if (m_ctrlTip.IsWindow())
{
m_ctrlTip.RelayEvent(&msg);
}
bHandled = FALSE; // Leave the message to next case
return 0;
}
LRESULT CListViewCtrlTip::OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
int xPos = GET_X_LPARAM(lParam);
int yPos = GET_Y_LPARAM(lParam);
POINT pt = { xPos, yPos };
int nCurItem = HitTest(pt, NULL);
// Check and active the tool tip control
if (nCurItem >= 0)
{
if (m_nCurItem != nCurItem)
{
m_ctrlTip.Activate(FALSE); // Deactivate first
m_nCurItem = nCurItem;
m_dwCurItemData = (ULONG)GetItemData(m_nCurItem);
m_ctrlTip.Activate(TRUE);
}
}
else
{
DeactivateTip();
}
bHandled = FALSE; // Leave the message to next case
return 0;
}
2. 修改调用类中CListViewCtrl类型为重载的类型，在初始化函数中调用Attach方法，在OnDestroy调用Detach方法。
CListViewCtrlTip m_lvw;
m_lvw.Attach(GetDlgItem(IDC_IST));
m_lvw.Detach();
3. 调用类处理TTN_GETDISPINFO通知，更新Tooltip的数据。
char m_szCurToolTip[MAX_TOOLTIP_LEN];
LRESULT CTestDlg::OnNotify(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam,
BOOL& /*bHandled*/)
{
switch (((LPNMHDR)lParam)->code)
{
case TTN_GETDISPINFO: // Notify event from list view control to get the tool tip string
LPNMTTDISPINFO pInfo = (LPNMTTDISPINFO)lParam;
// Make dynamic tool tip string here
pInfo->lpszText = m_szCurToolTip;
break;
}
return 0;
}
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