Microsoft KB Archive/147842

= How to detect a mouse click on any column of a List View control in Visual C++ =

Article ID: 147842

Article Last Modified on 11/21/2006

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APPLIES TO

 Microsoft Foundation Class Library 4.2, when used with:  Microsoft Visual C++ 4.0 Standard Edition

 Microsoft Visual C++ 5.0 Enterprise Edition

 Microsoft Visual C++ 6.0 Enterprise Edition

 Microsoft Visual C++ 5.0 Professional Edition</li></ul>

 Microsoft Visual C++ 6.0 Professional Edition</li></ul>

 Microsoft Visual C++ 6.0 Standard Edition</li></ul>

 Microsoft Visual C++ .NET 2002 Standard Edition</li></ul> </li> Microsoft Visual C++ .NET 2003 Standard Edition</li></ul>

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This article was previously published under Q147842

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Note Microsoft Visual C++ .NET 2002 and Microsoft Visual C++ .NET 2003 support both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code.

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SUMMARY
By design, a left-mouse click on a column other than the first column of a List View control when the control is in report view will not select the first column of that row. This article presents a way to detect the mouse click, and highlight the first column of the row where the mouse was clicked.

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Step-by-step procedure
The List View control will send a NM_CLICK notification code to its parent window whenever the user has clicked the left mouse button within its client area. Below are the necessary steps to intercept this notification code in the control itself (instead of the parent window) and to highlight the first column of the row that is being clicked: <ol> Open Solution Explorer. On the Project menu, click Add Class.</li> In the Add Class dialog box, double-click the MFC Class in the Templates pane.</li> In the MFC Class Wizard, type a class name of CMyListCtrl and a base class of CListCtrl, and then click Finish to add the new class to your project.</li>  Add a message event handler for the NM_CLICK message to the CMyListCtrl class: <ol style="list-style-type: lower-alpha;"> In the Class View window, click to select CMyListCtrl, open the Properties window, and then click Messages.</li> In the Properties window, click to select the =NM_CLICK entry.</li> Click to select the drop-down list that results, and then add the OnNMClick handler to your class. The following code is generated in the CMyListCtrl class:</li></ol>

// In the .h file of CMyListCtrl: class CMyListCtrl : public CListCtrl {      ...       protected: DECLARE_MESSAGE_MAP public: afx_msg void OnClickOnNMClick(NMHDR* pNMHDR, LRESULT* pResult);

};

// In the .cpp file of CMyListCtrl:

BEGIN_MESSAGE_MAP(CMyListCtrl, CListCtrl) ...      ON_NOTIFY_REFLECT(NM_CLICK, OnClickOnNMClick) END_MESSAGE_MAP

void CMyListCtrl::OnClickOnNMClick(NMHDR* pNMHDR, LRESULT* pResult) {      // TODO: Add your control notification handler code here

*pResult = 0; }                   </li> Modify the CMyListCtrl::OnClick function to perform the tasks in the sample code below.</li></ol>

Sample code
void CMyListCtrl::OnClickOnNMClick(NMHDR* pNMHDR, LRESULT* pResult) {     // Get the current mouse location and convert it to client // coordinates. DWORD pos = GetMessagePos; CPoint pt(LOWORD(pos), HIWORD(pos)); ScreenToClient(&pt);

// Get indexes of the first and last visible items in listview // control. int index = GetTopIndex; int last_visible_index = index + GetCountPerPage; if (last_visible_index > GetItemCount) last_visible_index = GetItemCount;

// Loop until number visible items has been reached. while (index <= last_visible_index) {        // Get the bounding rectangle of an item. If the mouse // location is within the bounding rectangle of the item, // you know you have found the item that was being clicked. CRect r;         GetItemRect(index, &r, LVIR_BOUNDS); if (r.PtInRect(pt)) {             UINT flag = LVIS_SELECTED | LVIS_FOCUSED; SetItemState(index, flag, flag); break; }

// Get the next item in listview control. index++; }

*pResult = 0; }

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