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标题: CDialogBar实现OnInitDialog()和DDX机制 [打印本页]

作者: qq263946146 时间: 2019-7-13 19:16
标题: CDialogBar实现OnInitDialog()和DDX机制
我们知道，CDialogBar兼具对话框和工具条的特征，通过使用对话框编辑器，可以自由地向其对话框模板中添加控件。但是，它不支持OnInitDialog()和DDX机制。本程序从CDialogBar派生一个新类CInitDialogBar，用于解决这个问题，使得对话框条可以像一半对话框那样工作。
事实上，DDX已经在CWnd类中具备，所以，实现派生于CWnd类的CDialogBar就比较容易。
首先，在CInitDialogBar类中重新定义Create函数：

BOOL Create(CWnd * pParentWnd, UINT nIDTemplate, UINT nStyle, UINT nID);

BOOL Create(CWnd * pParentWnd, LPCTSTR lpszTemplateName, UINT nStyle, UINT nID);

下一步，定义一个虚拟函数，用于是OnInitDialog函数的功能。同时，重新声明CWnD的DDX函数 DoDataExchange：

virtual BOOL OnInitDialogBar();

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CInitDialogBar)
protected:
virtual void DoDataExchange(CDataExchange* pDX);
//}}AFX_VIRTUAL

下面是新函数Create的实现代码：

// Let MFC Create the control
// Call the base class Create()
if(!CDialogBar::Create(pParentWnd,
lpszTemplateName, /*(nIDTemplate) for other Create()*/
nStyle, nID))
{
return FALSE;
}

// Since there is no WM_INITDIALOG message we have to call
// our own InitDialog function ourselves after m_hWnd is valid
if(!OnInitDialogBar())
return FALSE;
return TRUE;

下面是调用Create的例子。

首先从CInitDialogBar派生一个新类，并在CMainFrame类的CMainFrame::OnCreate()中编写下面代码：

// CInitDialogBar m_wndDialogBar; in mainframe.h

if (!m_wndDialogBar.Create(this, IDD_DBAR, CBRS_LEFT, 0))
{
TRACE0("Failed to create InitDialogBar\n");
return -1; // fail to create
}

m_wndDialogBar.EnableDocking(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
DockControlBar(&m_wndDialogBar);

下面是使用OnInitDialogBar的一个例子：
BOOL CMainDialogBar::OnInitDialogBar()
{
// Support for DDX mechanism
// If you do not want DDX then
// do not call base class
// All out DDX controls are intialized
// the virtual call to DoDataExchange.
CInitDialogBar::OnInitDialogBar();

// Initialize any controls NOT supported by DDX
// CBitmapButton is one
m_OKButton.AutoLoad(IDOK, this);

return TRUE;
}

void CMainDialogBar:

oDataExchange(CDataExchange* pDX)
{
ASSERT(pDX);

CInitDialogBar:

oDataExchange(pDX);

// DDX_??? functions to synchronize control with
// data or control object

//{{AFX_DATA_MAP(CAboutDlg)
DDX_Check(pDX, IDC_CHECK1, m_CheckBox);
//}}AFX_DATA_MAP
}

这样，通过调用UpdateData(TRUE)，就可以实现变量和控件当前状态之间进行数据交换。下面是CInitDialogBar的全部源码。

实现文件：

//////////////////////////////////////////////////////////////////////
//
// InitDialogBar.h: interface for the CInitDialogBar class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_INITDIALOGBAR_H__46B4D2B3_C982_11D1_8902_0060979C2EFD__INCLUDED_)

#define AFX_INITDIALOGBAR_H__46B4D2B3_C982_11D1_8902_0060979C2EFD__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

////////////////////////////////////////////////////////////////////////////
//
// CInitDialogBar window
//
////////////////////////////////////////////////////////////////////////////

class CInitDialogBar : public CDialogBar
{
DECLARE_DYNAMIC(CInitDialogBar)

// Construction / Destruction
public:
CInitDialogBar();
virtual ~CInitDialogBar();

// Attributes
public:

// Operations
public:

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CInitDialogBar)
protected:
virtual void DoDataExchange(CDataExchange* pDX);
//}}AFX_VIRTUAL

// Implementation
public:
BOOL Create(CWnd * pParentWnd, UINT nIDTemplate, UINT nStyle, UINT
nID);
BOOL Create(CWnd * pParentWnd, LPCTSTR lpszTemplateName, UINT
nStyle, UINT nID);

protected:
virtual BOOL OnInitDialogBar();

// Generated message map functions
protected:
//{{AFX_MSG(CInitDialogBar)
// NOTE - the ClassWizard will add and remove member functions
here.
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

////////////////////////////////////////////////////////////////////////////
/

#endif // !defined(AFX_INITDIALOGBAR_H__46B4D2B3_C982_11D1_8902_0060979C2EFD__INCLUDED_)

////////////////////////////////////////////////////////////////////////////
//
// InitDialogBar.cpp: implementation of the CInitDialogBar class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "spectra.h"
#include "InitDialogBar.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

IMPLEMENT_DYNAMIC(CInitDialogBar, CDialogBar)

BEGIN_MESSAGE_MAP(CInitDialogBar, CDialogBar)
//{{AFX_MSG_MAP(CInitDialogBar)
// NOTE - the ClassWizard will add and remove mapping macros
here.
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

CInitDialogBar::CInitDialogBar()
{
// In derived classes set intial
// state of control(s) here
}

CInitDialogBar::~CInitDialogBar()
{

}

BOOL CInitDialogBar::Create(CWnd * pParentWnd, LPCTSTR lpszTemplateName,
UINT nStyle, UINT nID)
{
// Let MFC Create the control
if(!CDialogBar::Create(pParentWnd, lpszTemplateName, nStyle, nID))
return FALSE;

// Since there is no WM_INITDIALOG message we have to call
// our own InitDialog function ourselves after m_hWnd is valid
if(!OnInitDialogBar())
return FALSE;

return TRUE;
}

BOOL CInitDialogBar::Create(CWnd * pParentWnd, UINT nIDTemplate,
UINT nStyle, UINT nID)
{
if(!Create(pParentWnd, MAKEINTRESOURCE(nIDTemplate), nStyle, nID))
return FALSE;

// Since there is no WM_INITDIALOG message we have to call
// our own InitDialog function ourselves after m_hWnd is valid
if(!OnInitDialogBar())
return FALSE;
return TRUE;
}

BOOL CInitDialogBar::OnInitDialogBar()
{
// Support for the MFC DDX model
// If you do not want this do not call the base class
// from derived classes
UpdateData(FALSE);

return TRUE;
}

void CInitDialogBar:

oDataExchange(CDataExchange* pDX)
{
//Derived Classes Overide this function
ASSERT(pDX);

CDialogBar:

oDataExchange(pDX);

// In derived class call the DDX_??? functions to set/retrieve values
// of your controls. See example derived class for how to do this.
}

头文件：

//////////////////////////////////////////////////////////////////////
//
// MainDialogBar.h: interface for the CMainDialogBar class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_MAINDIALOGBAR_H__46B4D2B3_C982_11D1_8902_0060979C2EFD__INCLUDED_)

#define AFX_MAINDIALOGBAR_H__46B4D2B3_C982_11D1_8902_0060979C2EFD__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

#include "InitDialogBar.h"

// CMainDialogBar window

class CMainDialogBar : public CInitDialogBar
{
DECLARE_DYNAMIC(CMainDialogBar)

// Construction
public:
CMainDialogBar();
virtual ~CMainDialogBar();

// Attributes
public:
protected:

// Control Objects
CBitmapButton m_OKButton;

// Control Variables
BOOL m_CheckBox;

// Operations
public:

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CMainDialogBar)
protected:
virtual void DoDataExchange(CDataExchange* pDX);
//}}AFX_VIRTUAL

protected:
virtual BOOL OnInitDialogBar();

// Implementation
public:

// Generated message map functions
protected:
//{{AFX_MSG(CMainDialogBar)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

////////////////////////////////////////////////////////////////////////////
/

#endif // !defined(AFX_MAINDIALOGBAR_H__46B4D2B3_C982_11D1_8902_0060979C2EFD__INCLUDED_)

////////////////////////////////////////////////////////////////////////////
//
// MainDialogBar.cpp: implementation of the CMainDialogBar class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "spectra.h"
#include "MainDialogBar.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

IMPLEMENT_DYNAMIC(CMainDialogBar, CInitDialogBar)

BEGIN_MESSAGE_MAP(CMainDialogBar, CInitDialogBar)
//{{AFX_MSG_MAP(CMainDialogBar)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

CMainDialogBar::CMainDialogBar()
{
//Set Initial conditions for controls
m_CheckBox = 1;
}

CMainDialogBar::~CMainDialogBar()
{

}

BOOL CMainDialogBar::OnInitDialogBar()
{
// Support for DDX mechanism
// If you do not want DDX then
// do not call base class
CInitDialogBar::OnInitDialogBar();

// Update any controls NOT supported by DDX
// CBitmapButton is one
m_OKButtton.AutoLoad(IDOK, this);

return TRUE;
}

void CMainDialogBar:

oDataExchange(CDataExchange* pDX)
{
ASSERT(pDX);

CInitDialogBar:

oDataExchange(pDX);

// DDX_??? functions to associate control with
// data or control object
// Call UpdateData(TRUE) to get data at any time
// Call UpdateData(FALSE) to set data at any time

//{{AFX_DATA_MAP(CAboutDlg)
DDX_Check(pDX, IDC_CHECK1, m_CheckBox);
//}}AFX_DATA_MAP
}

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