MFC - 富文字編輯

富文字編輯控制元件是一個視窗，使用者可以在其中輸入和編輯文字。文字可以分配字元和段落格式，並且可以包含嵌入的 OLE 物件。它由CRichEditCtrl類表示。

讓我們透過建立一個新的基於 MFC 對話方塊的應用程式來了解一個簡單的示例。

步驟 1 - 刪除 TODO 行，並從工具箱中拖動一個富文字編輯控制元件和三個按鈕。

步驟 2 - 將這三個按鈕的標題分別從粗體、斜體和下劃線更改為 IDC_BUTTON_BOLD、IDC_BUTTON_ITALIC 和 IDC_BUTTON_UNDERLINE。

步驟 3 - 將以下屬性設定為 True：多行、回車鍵、垂直捲軸。

步驟 4 - 為富文字編輯控制元件新增控制元件變數 m_richEdit。

步驟 5 − 進入 CMFCRichEditApp 並呼叫::AfxInitRichEdit2() 函式，該函式位於 CMFCRichEditApp::InitInstance() 函式中，如下程式碼所示。

BOOL CMFCRichEditApp::InitInstance() {
//TODO: call AfxInitRichEdit2() to initialize richedit2 library.
   // InitCommonControlsEx() is required on Windows XP if an application
   // manifest specifies use of ComCtl32.dll version 6 or later to enable
   // visual styles. Otherwise, any window creation will fail.
   INITCOMMONCONTROLSEX InitCtrls;
   InitCtrls.dwSize = sizeof(InitCtrls);
   // Set this to include all the common control classes you want to use
   // in your application.
   InitCtrls.dwICC = ICC_WIN95_CLASSES;
   InitCommonControlsEx(&InitCtrls);

   ::AfxInitRichEdit2();
   CWinApp::InitInstance();

   
   AfxEnableControlContainer();
   
   // Create the shell manager, in case the dialog contains
   // any shell tree view or shell list view controls.
   CShellManager *pShellManager = new CShellManager;

   // Activate "Windows Native" visual manager for enabling themes in MFC controls
   CMFCVisualManager::SetDefaultManager(RUNTIME_CLASS(CMFCVisualManagerWindows));

   // Standard initialization
   // If you are not using these features and wish to reduce the size
   // of your final executable, you should remove from the following
   // the specific initialization routines you do not need
   // Change the registry key under which our settings are stored
   // TODO: You should modify this string to be something appropriate
   // such as the name of your company or organization
   SetRegistryKey(_T("Local AppWizard-Generated Applications"));

   CMFCRichEditDlg dlg;
   m_pMainWnd = &dlg;
   INT_PTR nResponse = dlg.DoModal();
   if (nResponse == IDOK) {
      // TODO: Place code here to handle when the dialog is
      // dismissed with OK
   }else if (nResponse == IDCANCEL) {
      // TODO: Place code here to handle when the dialog is
      // dismissed with Cancel
   }else if (nResponse == -1) {
      TRACE(traceAppMsg, 0, "Warning: dialog creation failed, so
                                application is terminating unexpectedly.\n");
      TRACE(traceAppMsg, 0, "Warning: if you are using MFC controls on
              the dialog, you cannot #define _AFX_NO_MFC_CONTROLS_IN_DIALOGS.\n");
   }
	
   // Delete the shell manager created above.
   if (pShellManager != NULL) {
      delete pShellManager;
   }
	
   // Since the dialog has been closed, return FALSE so that we exit the
   // application, rather than start the application's message pump.
   return FALSE;
}

步驟 6 − 為所有三個按鈕新增 Click 事件處理程式。以下是這些事件的實現。

void CMFCRichEditDlg::OnBnClickedButtonBold() { 
   // TODO: Add your control notification handler code here 
   CHARFORMAT Cfm;
	
   m_richEdit.GetSelectionCharFormat(Cfm);  
	
   Cfm.cbSize = sizeof(CHARFORMAT); 
   Cfm.dwMask = CFM_BOLD; 
   Cfm.dwEffects ^= CFE_BOLD; 
	
   m_richEdit.SetSelectionCharFormat(Cfm); 
   m_richEdit.SetFocus(); 
}
  
void CMFCRichEditDlg::OnBnClickedButtonItalic() { 
   // TODO: Add your control notification handler code here
   CHARFORMAT Cfm;  
   
   m_richEdit.GetSelectionCharFormat(Cfm);  
	
   Cfm.cbSize = sizeof(CHARFORMAT); 
   Cfm.dwMask = CFM_ITALIC; 
   Cfm.dwEffects ^= CFE_ITALIC;  
	
   m_richEdit.SetSelectionCharFormat(Cfm); 
   m_richEdit.SetFocus(); 
}
  
void CMFCRichEditDlg::OnBnClickedButtonUnderline() { 
   // TODO: Add your control notification handler code here 
   CHARFORMAT Cfm;  
	
   m_richEdit.GetSelectionCharFormat(Cfm); 
	
   Cfm.cbSize = sizeof(CHARFORMAT); 
   Cfm.dwMask = CFM_UNDERLINE; 
   Cfm.dwEffects ^= CFE_UNDERLINE;  
	
   m_richEdit.SetSelectionCharFormat(Cfm); 
   m_richEdit.SetFocus(); 
} 

步驟 7 − 當上述程式碼編譯並執行後，您將看到以下輸出。現在輸入文字，並透過選擇文字然後單擊任意三個按鈕之一來更改其格式。