Dialog &amp; Windows

11.响应对话框的最大化、最小化、关闭、恢复事件

方法一：添加 WM_SYSCOMMAND 消息映射函数

void CTest6Dlg::OnSysCommand(UINT nID, LPARAM lParam)

{

if ( (nID & 0xFFF0) == IDM_ABOUTBOX )

{

CAboutDlg dlgAbout;

dlgAbout.DoModal();

}

else

{

if ( nID == SC_MAXIMIZE )

{

AfxMessageBox(_T("最大化"));

}

else if ( nID == SC_MINIMIZE )

{

AfxMessageBox(_T("最小化"));

}

else if ( nID == SC_CLOSE )

{

AfxMessageBox(_T("关闭"));

}

CDialog::OnSysCommand(nID, lParam);

}

方法二：添加 WM_SIZE 消息映射函数

void CTest6Dlg::OnSize(UINT nType, int cx, int cy)

{

CDialog::OnSize(nType, cx, cy);

if ( nType == SIZE_MAXIMIZED )

{

AfxMessageBox(_T("最大化"));

}

else if ( nType == SIZE_MINIMIZED )

{

AfxMessageBox(_T("最小化"));

}

else if ( nType == SIZE_RESTORED )

{

AfxMessageBox(_T("恢复"));

}

12.代码实现窗口最小化，最大化，关闭

PostMessage(WM_SYSCOMMAND, SC_MINIMIZE);

PostMessage(WM_SYSCOMMAND, SC_MAXIMIZE);

PostMessage(WM_SYSCOMMAND, SC_CLOSE);

13.按下ESC和ENTER键时禁止关闭对话框

方法一：

(1) 重载OnCancel和OnOk，屏蔽其中的CDialog::OnCancel()和CDialog::OnOk();

(2) 添加以下代码

void CTest6Dlg::OnSysCommand(UINT nID, LPARAM lParam)

{

if ((nID & 0xFFF0) == IDM_ABOUTBOX)

{

CAboutDlg dlgAbout; //if you have an about dialog

dlgAbout.DoModal();

}

else if ((nID & 0xFFF0) == SC_CLOSE)

{

//用户点击右上角"X"

EndDialog(IDOK);

}

else

{

CDialog::OnSysCommand(nID, lParam);

}

方法二：

BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)

{

if ( pMsg->message == WM_KEYDOWN )

{

switch(pMsg->wParam)

{

case VK_ESCAPE:

return TRUE; //直接返回TRUE

break;

case VK_RETURN:

return TRUE;

break;

}

return CDialog::PreTranslateMessage(pMsg);

}

方法三：

Q122489：

How to Disable Default Pushbutton Handling for MFC Dialog

http://support.microsoft.com/kb/122489/en-us

14.在对话框中处理键盘鼠标消息

处理PreTranslateMessage消息

以下代码示例只演示了键盘WM_KEYDOWN消息，你也可以处理鼠标消息，比如WM_LBUTTONDOWN,WM_LBUTTONUP,WM_RBUTTONDOWN等。

BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)

{

if ( pMsg->message == WM_KEYDOWN )

{

switch( pMsg->wParam )

{

case VK_RETURN:

CEdit *pEdit = (CEdit*)m_combo1.GetWindow(GW_CHILD);

if(pMsg->hwnd == pEdit->m_hWnd )

{

AfxMessageBox("在combobox的edit中按下了Enter!");

}

return TRUE;

}

if( pMsg->message == WM_SYSKEYDOWN )

{

switch( pMsg->wParam )

{

case VK_F1:

if(::GetKeyState(VK_MENU) < 0)//ALT+F1

{

AfxMessageBox("按下了ALT+F1");

return TRUE;

}

if( pMsg->message == WM_KEYDOWN )

{

if(pMsg->hwnd == GetDlgItem(IDC_LIST1)->m_hWnd)

{

switch( pMsg->wParam )

{

case 65://A

if(::GetKeyState(VK_CONTROL) < 0)//Shift+enter

{

for(int i=0; i<m_list.GetItemCount(); i++)

{

m_list.SetItemState(i, LVIS_SELECTED|LVIS_FOCUSED,

LVIS_SELECTED|LVIS_FOCUSED);

}

return TRUE;

}

if(pMsg->message == WM_RBUTTONDOWN)

{

CEdit *pEdit = (CEdit*)m_combo1.GetWindow(GW_CHILD);

if(pMsg->hwnd == pEdit->m_hWnd)

{

DWORD dwPos = GetMessagePos();

CPoint point( LOWORD(dwPos), HIWORD(dwPos) );

ScreenToClient(&point);

ClientToScreen(&point);

CMenu menu;

VERIFY( menu.LoadMenu( IDR_MENU1 ) );

CMenu* popup = menu.GetSubMenu(0);

ASSERT( popup != NULL );

popup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this );

}

return CDialog::PreTranslateMessage(pMsg);

}

15.对话框启动即隐藏

添加 WM_SHOWWINDOW 的消息映射

void CTest6Dlg::OnShowWindow(BOOL bShow, UINT nStatus)

{

if ( GetStyle() & WS_VISIBLE )

{

CDialog::OnShowWindow(bShow, nStatus);

}

else

{

long Style = ::GetWindowLong(*this, GWL_STYLE);

::SetWindowLong(*this, GWL_STYLE, Style | WS_VISIBLE);

CDialog::OnShowWindow(SW_HIDE, nStatus);

}

16.对话框自动停靠在屏幕边

const int DETASTEP = 50;

BOOL AdjustPos(CWnd *pWnd, CRect* lpRect)

{

//自动靠边

int iSX = GetSystemMetrics(SM_CXFULLSCREEN);

int iSY = GetSystemMetrics(SM_CYFULLSCREEN);

RECT rWorkArea;

BOOL bResult = SystemParametersInfo(SPI_GETWORKAREA, sizeof(RECT), &rWorkArea, 0);

CRect rcWA;

if ( !bResult )

{

//如果调用不成功就利用GetSystemMetrics获取屏幕面积

rcWA = CRect(0,0,iSX,iSY);

}

else

rcWA = rWorkArea;

int iX = lpRect->left;

int iY = lpRect->top;

if ( iX < rcWA.left + DETASTEP && iX!=rcWA.left )

{

//调整左

pWnd->SetWindowPos(NULL,rcWA.left,iY,0,0,SWP_NOSIZE);

lpRect->OffsetRect(rcWA.left-iX,0);

AdjustPos(lpRect);

return TRUE;

}

if ( iY < rcWA.top + DETASTEP && iY!=rcWA.top )

{

//调整上

pWnd->SetWindowPos(NULL ,iX,rcWA.top,0,0,SWP_NOSIZE);

lpRect->OffsetRect(0,rcWA.top-iY);

AdjustPos(lpRect);

return TRUE;

}

if ( iX + lpRect->Width() > rcWA.right - DETASTEP && iX !=rcWA.right-lpRect->Width() )

{

//调整右

pWnd->SetWindowPos(NULL ,rcWA.right-rcW.Width(),iY,0,0,SWP_NOSIZE);

lpRect->OffsetRect(rcWA.right-lpRect->right,0);

AdjustPos(lpRect);

return TRUE;

}

if ( iY + lpRect->Height() > rcWA.bottom - DETASTEP && iY !=rcWA.bottom-lpRect->Height() )

{

//调整下

pWnd->SetWindowPos(NULL ,iX,rcWA.bottom-rcW.Height(),0,0,SWP_NOSIZE);

lpRect->OffsetRect(0,rcWA.bottom-lpRect->bottom);

return TRUE;

}

return FALSE;

}

//然后在ONMOVEING事件中使用如下过程调用

CRect r=*pRect;

AdjustPos(this, &r);

*pRect=(RECT)r;

17.单击窗口任意位置都可拖动窗口

方法一：

添加 WM_LBUTTONDOWN 的消息映射

void CTest6Dlg::OnLButtonDown(UINT nFlags, CPoint point)

{

PostMessage(WM_NCLBUTTONDOWN, HTCAPTION, 0);

CDialog::OnLButtonDown(nFlags, point);

}

方法二：

添加 WM_NCHITTEST 的消息映射

注意：在classwizard->message中找不到 WM_NCHITTEST的，需要在选项卡class info->message filter中选择window后该消息才会出现在message中。

void CTest6Dlg::OnNCHitTest(CPoint point)

{

return HTCAPTION;

// return CDialog:: OnNCHitTest (point);

}

或者参考

http://msdn.microsoft.com/msdnmag/issues/02/12/CQA/default.aspx

18.用Enter键替换Tab键实现焦点切换

BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)

{

if ( pMsg->message == WM_KEYDOWN )

{

if ( pMsg->wParam == VK_RETURN )

pMsg->wParam = VK_TAB;

}

return CDialog::PreTranslateMessage(pMsg);

}

19.在对话框添加快捷键

(1) 在CXXXApp中类中添加声明

HACCEL m_haccel;

(2) 在resource view中右键点击树的根目录，选择insert，添加一个新的Accelerator，默认ID为 IDR_ACCELERATOR1 。

在其中添加相应菜单的快捷键。

(3) 在BOOL CXXXApp::InitInstance()中添加代码

m_haccel = LoadAccelerators(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDR_ACCELERATOR1 ));

(4) 添加CXXXApp类的 ProcessMessageFilter 消息映射函数

BOOL CTest6App::ProcessMessageFilter(int code, LPMSG lpMsg)

{

if ( m_haccel )

{

if ( ::TranslateAccelerator(m_pMainWnd->m_hWnd, m_haccel, lpMsg) )

return TRUE;

}

return CWinApp::ProcessMessageFilter(code, lpMsg);

}

或者参考

Q100770：

How to use accelerator keys and a main menu on the dialog box in Visual C++

http://support.microsoft.com/kb/100770/en-us

Adding Hot Keys to your Application

http://msdn.microsoft.com/msdnmag/issues/1200/c/default.aspx

20.对话框全屏

int cx, cy;

HDC dc = ::GetDC(NULL);

cx = GetDeviceCaps(dc,HORZRES) + GetSystemMetrics(SM_CXBORDER);

cy = GetDeviceCaps(dc,VERTRES) + GetSystemMetrics(SM_CYBORDER);

::ReleaseDC(0,dc);

// Remove caption and border

SetWindowLong(m_hWnd, GWL_STYLE,

GetWindowLong(m_hWnd, GWL_STYLE) & (~(WS_CAPTION | WS_BORDER)));

// Put window on top and expand it to fill screen

::SetWindowPos(m_hWnd, HWND_TOPMOST,

-(GetSystemMetrics(SM_CXBORDER)+1),

-(GetSystemMetrics(SM_CYBORDER)+1),

cx+1,cy+1, SWP_NOZORDER);

或参考

http://www.codeguru.com/cpp/w-d/dislog/dialog-basedapplications/article.php/c1837/

Dialog & Windows

12.代码实现窗口最小化，最大化，关闭

13.按下ESC和ENTER键时禁止关闭对话框

14.在对话框中处理键盘鼠标消息

15.对话框启动即隐藏

16.对话框自动停靠在屏幕边

17.单击窗口任意位置都可拖动窗口

18.用Enter键替换Tab键实现焦点切换

19.在对话框添加快捷键

20.对话框全屏

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无组件上传图片到数据库中，最完整解决方案

Dialog &amp; Windows

12.代码实现窗口最小化，最大化，关闭

13.按下ESC和ENTER键时禁止关闭对话框

14.在对话框中处理键盘鼠标消息

15.对话框启动即隐藏

16.对话框自动停靠在屏幕边

17.单击窗口任意位置都可拖动窗口

18.用Enter键替换Tab键实现焦点切换

19.在对话框添加快捷键

20.对话框全屏

继续阅读

Dialog & Windows