WTL CCheckListViewCtrl详解及示例

wtl中提供了一个很好用的控件CCheckListViewCtrl，这个控件在listviewctrl的report模式的每一行的前面增加了一个CheckBox，注意这个控件只用于listviewctrl的report模式，至于为什么，我们后面会讲到这个问题。下面我们将一下这个控件的用法。

 

1、像其他控件一样，首先，你需要在dlg里面声明一个CCheckListViewCtrl的对象。

CCheckListViewCtrl m_listCtrl 

2、跟控件进行关联及插入数据：

m_lst.SubclassWindow(GetDlgItem(IDC_LIST1).m_hWnd);m_lst.InsertColumn(0, _T("test1"), LVCFMT_LEFT, 100);m_lst.InsertItem(0, _T("item1"));m_lst.InsertItem(0, _T("item2"));m_lst.SetItemText(0, 0, _T("1"));m_lst.SetItemText(1, 0, _T("2")); 

运行看看，是不是已经看到效果啦^^

 

3、处理点击消息，这个消息共用了LVN_ITEMCHANGED消息，我们需要加入消息处理：

NOTIFY_HANDLER(IDC_LIST1, LVN_ITEMCHANGED, OnLvnItemchangedList1) 

再加入消息处理的函数（这段是从网上找来的）：

LRESULT CMainDlg::OnLvnItemchangedList1(int /*idCtrl*/, LPNMHDR pNMHDR, BOOL& /*bHandled*/){LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);// TODO: 在此添加控件通知处理程序代码NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR; if (pNMListView-> uOldState == 0 && pNMListView-> uNewState == 0) return 0; // No change // Old check box state BOOL bPrevState = (BOOL)(((pNMListView-> uOldState & LVIS_STATEIMAGEMASK)>> 12)-1); if (bPrevState < 0) // On startup there 's no previous state bPrevState = 0; // so assign as false (unchecked) // New check box state BOOL bChecked = (BOOL)(((pNMListView-> uNewState & LVIS_STATEIMAGEMASK)>> 12)-1); if (bChecked < 0) // On non-checkbox notifications assume false bChecked = 0; if (bPrevState == bChecked) // No change in check box return 0; else { MessageBox(_T(""), _T(""));} return 0;} 

再试试，看到效果了吧，下面我们讲解一下这个类的实际构成，这里直接摘抄了wtl的源码，加上注释而来

template <DWORD t_dwStyle, DWORD t_dwExStyle, DWORD t_dwExListViewStyle>class CCheckListViewCtrlImplTraits{public:static DWORD GetWndStyle(DWORD dwStyle){return (dwStyle == 0) ? t_dwStyle : dwStyle;}static DWORD GetWndExStyle(DWORD dwExStyle){return (dwExStyle == 0) ? t_dwExStyle : dwExStyle;}static DWORD GetExtendedLVStyle(){return t_dwExListViewStyle;}};/*这里定义了这个控件的属性，里面已经加入了LVS_REPORT，LVS_EX_CHECKBOXES属性指定了该类有一个checkBox，在SubClass的时候会对控件的属性进行修改，另外动态创建的时候会用到该属性,所以说这个类只用于报表模式*/typedef CCheckListViewCtrlImplTraits<WS_CHILD | WS_VISIBLE | LVS_REPORT | LVS_SHOWSELALWAYS, WS_EX_CLIENTEDGE, LVS_EX_CHECKBOXES | LVS_EX_FULLROWSELECT> CCheckListViewCtrlTraits;/*下面是该类具体实现*/template <class T, class TBase = CListViewCtrl, class TWinTraits = CCheckListViewCtrlTraits>class ATL_NO_VTABLE CCheckListViewCtrlImpl : public ATL::CWindowImpl<T, TBase, TWinTraits>{public:DECLARE_WND_SUPERCLASS(NULL, TBase::GetWndClassName())// Attributesstatic DWORD GetExtendedLVStyle(){return TWinTraits::GetExtendedLVStyle();}// OperationsBOOL SubclassWindow(HWND hWnd){#if (_MSC_VER >= 1300)BOOL bRet = ATL::CWindowImplBaseT< TBase, TWinTraits>::SubclassWindow(hWnd);#else // !(_MSC_VER >= 1300)typedef ATL::CWindowImplBaseT< TBase, TWinTraits> _baseClass;BOOL bRet = _baseClass::SubclassWindow(hWnd);#endif // !(_MSC_VER >= 1300)//这里对控件的属性进行修改if(bRet){T* pT = static_cast<T*>(this);pT;ATLASSERT((pT->GetExtendedLVStyle() & LVS_EX_CHECKBOXES) != 0);SetExtendedListViewStyle(pT->GetExtendedLVStyle());}return bRet;}void CheckSelectedItems(int nCurrItem){// first check if this item is selectedLVITEM lvi = { 0 };lvi.iItem = nCurrItem;lvi.iSubItem = 0;lvi.mask = LVIF_STATE;lvi.stateMask = LVIS_SELECTED;GetItem(&lvi);// if item is not selected, don't do anythingif(!(lvi.state & LVIS_SELECTED))return;// new check state will be reverse of the current state,BOOL bCheck = !GetCheckState(nCurrItem);int nItem = -1;int nOldItem = -1;while((nItem = GetNextItem(nOldItem, LVNI_SELECTED)) != -1){if(nItem != nCurrItem)SetCheckState(nItem, bCheck);nOldItem = nItem;}}// ImplementationBEGIN_MSG_MAP(CCheckListViewCtrlImpl)MESSAGE_HANDLER(WM_CREATE, OnCreate)MESSAGE_HANDLER(WM_LBUTTONDOWN, OnLButtonDown)MESSAGE_HANDLER(WM_LBUTTONDBLCLK, OnLButtonDown)MESSAGE_HANDLER(WM_KEYDOWN, OnKeyDown)END_MSG_MAP()LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& /*bHandled*/){// first let list view control initialize everythingLRESULT lRet = DefWindowProc(uMsg, wParam, lParam);T* pT = static_cast<T*>(this);pT;ATLASSERT((pT->GetExtendedLVStyle() & LVS_EX_CHECKBOXES) != 0);SetExtendedListViewStyle(pT->GetExtendedLVStyle());return lRet;}/*这里两个函数都判断是否ctrl按下，对多选进行处理。*/LRESULT OnLButtonDown(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL& bHandled){POINT ptMsg = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };LVHITTESTINFO lvh = { 0 };lvh.pt = ptMsg;if(HitTest(&lvh) != -1 && lvh.flags == LVHT_ONITEMSTATEICON && ::GetKeyState(VK_CONTROL) >= 0){T* pT = static_cast<T*>(this);pT->CheckSelectedItems(lvh.iItem);}bHandled = FALSE;return 1;}LRESULT OnKeyDown(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& bHandled){if(wParam == VK_SPACE){int nCurrItem = GetNextItem(-1, LVNI_FOCUSED);if(nCurrItem != -1 && ::GetKeyState(VK_CONTROL) >= 0){T* pT = static_cast<T*>(this);pT->CheckSelectedItems(nCurrItem);}}bHandled = FALSE;return 1;}};class CCheckListViewCtrl : public CCheckListViewCtrlImpl<CCheckListViewCtrl>{public:DECLARE_WND_SUPERCLASS(_T("WTL_CheckListView"), GetWndClassName())};