带复选框的下拉列表

用自定义的CCheckComboBox类做带复选框的下拉列表 1、添加Combo Box控件

2.、改属性Style：DropList ； Owner Draw：Fixed ； Has string：true ；Sort：false 3、头文件中添加：

CCheckComboBox m_comboBox;

4、DoDataExchange(CDataExchange* pDX)中添加： DDX_Control(pDX, IDC_COMBO1, m_comboBox); 5、对话框初始化时添加

m_comboBox.AddString(_T(\加入项目 m_comboBox.AddString(_T(\ m_comboBox.AddString(_T(\ m_comboBox.AddString(_T(\

m_comboBox.SetCheck(0, TRUE);//设置选择状态 m_comboBox.SetCheck(1, FALSE); m_comboBox.SetCheck(2, TRUE); m_comboBox.SetCheck(3, TRUE);

#if !defined(AFX_CHECKCOMBOBOX_H__66750D93_95DB_11D3_9325_444553540000__INCLUDED_)

#define AFX_CHECKCOMBOBOX_H__66750D93_95DB_11D3_9325_444553540000__INCLUDED_ #if _MSC_VER > 1000 #pragma once

#endif // _MSC_VER > 1000

class CCheckComboBox : public CComboBox {

public:

CCheckComboBox();

virtual ~CCheckComboBox();

BOOL Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID); // Selects all/unselects the specified item INT SetCheck(INT nIndex, BOOL bFlag); // Returns checked state BOOL GetCheck(INT nIndex);

// Selects all/unselects all

void SelectAll(BOOL bCheck = TRUE);

protected:

// ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CCheckComboBox) protected:

virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);

virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct); //}}AFX_VIRTUAL

//{{AFX_MSG(CCheckComboBox)

afx_msg LRESULT OnCtlColorListBox(WPARAM wParam, LPARAM lParam); afx_msg LRESULT OnGetText(WPARAM wParam, LPARAM lParam);

afx_msg LRESULT OnGetTextLength(WPARAM wParam, LPARAM lParam); afx_msg void OnDropDown(); //}}AFX_MSG

DECLARE_MESSAGE_MAP() public:

CString m_strText; protected:

// Routine to update the text void RecalcText();

// The subclassed COMBOLBOX window (notice the 'L') HWND m_hListBox;

// The string containing the text to display BOOL m_bTextUpdated;

// A flag used in MeasureItem, see comments there BOOL m_bItemHeightSet; };

///////////////////////////////////////////////////////////////////////////// //{{AFX_INSERT_LOCATION}}

// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif

// !defined(AFX_CHECKCOMBOBOX_H__66750D93_95DB_11D3_9325_444553540000__INCLUDED_)

/** CheckComboBox.cpp **/

// CheckComboBox.cpp //

// Written by Magnus Egelberg (magnus.egelberg@lundalogik.se) //

// Copyright (C) 1999, Lundalogik AB, Sweden. All rights reserved. // //

#include \

// #include \#include \

#ifdef _DEBUG

#define new DEBUG_NEW #undef THIS_FILE

static char THIS_FILE[] = __FILE__; #endif

static WNDPROC m_pWndProc = 0;

static CCheckComboBox *m_pComboBox = 0;

BEGIN_MESSAGE_MAP(CCheckComboBox, CComboBox) //{{AFX_MSG_MAP(CCheckComboBox)

ON_MESSAGE(WM_CTLCOLORLISTBOX, OnCtlColorListBox) ON_MESSAGE(WM_GETTEXT, OnGetText)

ON_MESSAGE(WM_GETTEXTLENGTH, OnGetTextLength) ON_CONTROL_REFLECT(CBN_DROPDOWN, OnDropDown) //}}AFX_MSG_MAP END_MESSAGE_MAP()

//

// The subclassed COMBOLBOX message handler //

extern \wParam, LPARAM lParam) {

switch (nMsg) {

case WM_RBUTTONDOWN: {

// If you want to select all/unselect all using the

// right button, remove this ifdef. Personally, I don't really like it #if FALSE

if (m_pComboBox != 0) {

INT nCount = m_pComboBox->GetCount(); INT nSelCount = 0;

for (INT i = 0; i < nCount; i++) { if (m_pComboBox->GetCheck(i)) nSelCount++; }

m_pComboBox->SelectAll(nSelCount != nCount); // Make sure to invalidate this window as well InvalidateRect(hWnd, 0, FALSE);

m_pComboBox->GetParent()->SendMessage(WM_COMMAND,