两种方法实现MFC 对话框最大化时控件也随比例最大化或者还原

原文地址：http://blog.csdn.net/zyw_anquan/article/details/8257722

两种方法实现MFC 对话框最大化时控件也随比例最大化或者还原

方法一：单个控件ID操作

第一步、在对话框类中（.h文件）定义如下变量和函数

定义如下几个变量：

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void ReSize(int nID);  
BOOL change_flag;  
float m_Multiple_height;  
float m_Multiple_width;  

void ReSize(int nID);
BOOL change_flag;
float m_Multiple_height;
float m_Multiple_width;

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afx_msg void OnSize(UINT nType, int cx, int cy);  

afx_msg void OnSize(UINT nType, int cx, int cy);

第二步、在OnInitDialog()中 计算出当前对话框的大小与最大化后大小

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CRect rect;  
::GetWindowRect(m_hWnd,rect);//这里m_hWnd为窗口句柄，如果不存在此变量则在该行代码前加一句：HWND h_Wnd=GetSafeHwnd( );  
ScreenToClient(rect);  
LONG m_nDlgWidth = rect.right - rect.left;  
LONG m_nDlgHeight = rect.bottom - rect.top;  
//Calc 分辨率  
LONG m_nWidth = GetSystemMetrics(SM_CXSCREEN);  
LONG m_nHeight = GetSystemMetrics(SM_CYSCREEN);  
//计算放大倍数(要用float值，否则误差很大)  
m_Multiple_width = float(m_nWidth)/float(m_nDlgWidth);  
m_Multiple_height = float(m_nHeight)/float(m_nDlgHeight);     
change_flag = TRUE;//用来判断OnSize执行时，OninitDialg是否已经执行了  

CRect rect;
::GetWindowRect(m_hWnd,rect);//这里m_hWnd为窗口句柄，如果不存在此变量则在该行代码前加一句：HWND h_Wnd=GetSafeHwnd( );
ScreenToClient(rect);
LONG m_nDlgWidth = rect.right - rect.left;
LONG m_nDlgHeight = rect.bottom - rect.top;
//Calc 分辨率
LONG m_nWidth = GetSystemMetrics(SM_CXSCREEN);
LONG m_nHeight = GetSystemMetrics(SM_CYSCREEN);
//计算放大倍数(要用float值，否则误差很大)
m_Multiple_width = float(m_nWidth)/float(m_nDlgWidth);
m_Multiple_height = float(m_nHeight)/float(m_nDlgHeight);
change_flag = TRUE;//用来判断OnSize执行时，OninitDialg是否已经执行了

第三步、给对话框添加 WM_SIZE消息

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//给对话框添加 VM_SIZE消息  
void CStuDemoDlg::OnSize(UINT nType, int cx, int cy)   
{  
    CDialog::OnSize(nType, cx, cy);  
      
    // TODO: Add your message handler code here  
    if (change_flag)//如果OninitDlg已经调用完毕  
    {  
        ReSize(IDC_STATIC_1);  
        ReSize(IDC_STATIC_2);         
        ReSize(IDC_EDIT11);//  
        ReSize(IDC_EDIT12);//  
        ReSize(IDC_LIST_SHOW);//LIST  
        ReSize(IDC_BUTTON_ADD);  
        ReSize(IDC_BUTTON_DEL);  
        ReSize(IDOK);  
        ReSize(IDCANCEL);  
        //恢复放大倍数，并保存 (确保还原时候能够还原到原来的大小)  
        m_Multiple_width = float(1)/m_Multiple_width;  
        m_Multiple_height = float(1)/m_Multiple_height;  
    }  
}  

//给对话框添加 VM_SIZE消息
void CStuDemoDlg::OnSize(UINT nType, int cx, int cy)
{
CDialog::OnSize(nType, cx, cy);

// TODO: Add your message handler code here
if (change_flag)//如果OninitDlg已经调用完毕
{
ReSize(IDC_STATIC_1);
ReSize(IDC_STATIC_2);
ReSize(IDC_EDIT11);//
ReSize(IDC_EDIT12);//
ReSize(IDC_LIST_SHOW);//LIST
ReSize(IDC_BUTTON_ADD);
ReSize(IDC_BUTTON_DEL);
ReSize(IDOK);
ReSize(IDCANCEL);
//恢复放大倍数，并保存 (确保还原时候能够还原到原来的大小)
m_Multiple_width = float(1)/m_Multiple_width;
m_Multiple_height = float(1)/m_Multiple_height;
}
}

第四步、刷新控件：根据比例计算控件缩放的大小，然后movewindow 到新矩形上

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void CStuDemoDlg::ReSize(int nID)  
{  
    CRect Rect;   
    GetDlgItem(nID)->GetWindowRect(Rect);   
    ScreenToClient(Rect);   
    //计算控件左上角点   
    CPoint OldTLPoint,TLPoint;   
    OldTLPoint = Rect.TopLeft();   
    TLPoint.x = long(OldTLPoint.x *m_Multiple_width);   
    TLPoint.y = long(OldTLPoint.y * m_Multiple_height );   
    //计算控件右下角点   
    CPoint OldBRPoint,BRPoint; OldBRPoint = Rect.BottomRight();   
    BRPoint.x = long(OldBRPoint.x *m_Multiple_width);   
    BRPoint.y = long(OldBRPoint.y * m_Multiple_height );   
    //移动控件到新矩形   
    Rect.SetRect(TLPoint,BRPoint);   
    GetDlgItem(nID)->MoveWindow(Rect,TRUE);  
}  

void CStuDemoDlg::ReSize(int nID)
{
CRect Rect;
GetDlgItem(nID)->GetWindowRect(Rect);
ScreenToClient(Rect);
//计算控件左上角点
CPoint OldTLPoint,TLPoint;
OldTLPoint = Rect.TopLeft();
TLPoint.x = long(OldTLPoint.x *m_Multiple_width);
TLPoint.y = long(OldTLPoint.y * m_Multiple_height );
//计算控件右下角点
CPoint OldBRPoint,BRPoint; OldBRPoint = Rect.BottomRight();
BRPoint.x = long(OldBRPoint.x *m_Multiple_width);
BRPoint.y = long(OldBRPoint.y * m_Multiple_height );
//移动控件到新矩形
Rect.SetRect(TLPoint,BRPoint);
GetDlgItem(nID)->MoveWindow(Rect,TRUE);
}

方法二：集体控件操作

第一步、在对话框类中（.h文件）定义如下变量和函数

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void ReSize();  
POINT old;  

void ReSize();
POINT old;

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afx_msg void OnSize(UINT nType, int cx, int cy);  

afx_msg void OnSize(UINT nType, int cx, int cy);

第二步、在OnInitDialog()中 计算出原始对话框的大小

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CRect rect;      
GetClientRect(&rect);     //取客户区大小    
old.x=rect.right-rect.left;  
old.y=rect.bottom-rect.top;  

CRect rect;
GetClientRect(&rect);     //取客户区大小
old.x=rect.right-rect.left;
old.y=rect.bottom-rect.top;

第三步、添加 WM_SIZE消息

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void CStuDemoDlg::OnSize(UINT nType, int cx, int cy)   
{  
    CDialog::OnSize(nType, cx, cy);  
    // TODO: Add your message handler code here  
    if (nType==SIZE_RESTORED||nType==SIZE_MAXIMIZED)  
    {  
        ReSize();  
    }  
}  

void CStuDemoDlg::OnSize(UINT nType, int cx, int cy)
{
CDialog::OnSize(nType, cx, cy);
// TODO: Add your message handler code here
if (nType==SIZE_RESTORED||nType==SIZE_MAXIMIZED)
{
ReSize();
}
}

第四步、刷新控件函数

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void CStuDemoDlg::ReSize()  
{  
    float fsp[2];  
    POINT Newp; //获取现在对话框的大小  
    CRect recta;      
    GetClientRect(&recta);     //取客户区大小    
    Newp.x=recta.right-recta.left;  
    Newp.y=recta.bottom-recta.top;  
    fsp[0]=(float)Newp.x/old.x;  
    fsp[1]=(float)Newp.y/old.y;  
    CRect Rect;  
    int woc;  
    CPoint OldTLPoint,TLPoint; //左上角  
    CPoint OldBRPoint,BRPoint; //右下角  
    HWND  hwndChild=::GetWindow(m_hWnd,GW_CHILD);  //列出所有控件    
    while(hwndChild)      
    {      
        woc=::GetDlgCtrlID(hwndChild);//取得ID  
        GetDlgItem(woc)->GetWindowRect(Rect);    
        ScreenToClient(Rect);    
        OldTLPoint = Rect.TopLeft();    
        TLPoint.x = long(OldTLPoint.x*fsp[0]);    
        TLPoint.y = long(OldTLPoint.y*fsp[1]);    
        OldBRPoint = Rect.BottomRight();    
        BRPoint.x = long(OldBRPoint.x *fsp[0]);    
        BRPoint.y = long(OldBRPoint.y *fsp[1]);    
        Rect.SetRect(TLPoint,BRPoint);    
        GetDlgItem(woc)->MoveWindow(Rect,TRUE);  
        hwndChild=::GetWindow(hwndChild, GW_HWNDNEXT);      
    }  
    old=Newp;  
}  

void CStuDemoDlg::ReSize()
{
float fsp[2];
POINT Newp; //获取现在对话框的大小
CRect recta;
GetClientRect(&recta);     //取客户区大小
Newp.x=recta.right-recta.left;
Newp.y=recta.bottom-recta.top;
fsp[0]=(float)Newp.x/old.x;
fsp[1]=(float)Newp.y/old.y;
CRect Rect;
int woc;
CPoint OldTLPoint,TLPoint; //左上角
CPoint OldBRPoint,BRPoint; //右下角
HWND  hwndChild=::GetWindow(m_hWnd,GW_CHILD);  //列出所有控件
while(hwndChild)
{
woc=::GetDlgCtrlID(hwndChild);//取得ID
GetDlgItem(woc)->GetWindowRect(Rect);
ScreenToClient(Rect);
OldTLPoint = Rect.TopLeft();
TLPoint.x = long(OldTLPoint.x*fsp[0]);
TLPoint.y = long(OldTLPoint.y*fsp[1]);
OldBRPoint = Rect.BottomRight();
BRPoint.x = long(OldBRPoint.x *fsp[0]);
BRPoint.y = long(OldBRPoint.y *fsp[1]);
Rect.SetRect(TLPoint,BRPoint);
GetDlgItem(woc)->MoveWindow(Rect,TRUE);
hwndChild=::GetWindow(hwndChild, GW_HWNDNEXT);
}
old=Newp;
}

总结：

就个人而言，本人还是比较倾向第二种方法，毕竟可以少操作控件ID，否则少了一个布局都会发生变化。