Creating a View in Dialog (An easy way).

Tuesday Feb 19th 2002 by Z Mohamed Mustafa
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Adding a view to a dialog.

Environment developed: VC6 Win 2K]

To create a view you normally follow the Microsoft's Document template model. (i.e) Single document template or multi doc template. You can pass three runtime classes to the constructors:

CSingleDocTemplate( UINT nIDResource,
                    CRuntimeClass* pDocClass, 
                    CRuntimeClass* pFrameClass,
                    CRuntimeClass* pViewClass );

OR

CMultiDocTemplate( UINT nIDResource, 
                   CRuntimeClass* pDocClass,
                   CRuntimeClass* pFrameClass,
                   CRuntimeClass* pViewClass );

When the document template is added, frame (child for MDI , main frame for SDI), document, and a view is created dynamically and added to the application's document template list.

But some times you may need to create a view without using the default document template classes. For instance, if you are to create a view in dialog, you can not use the regular way of document template. In those cases you can use the following method:

BOOL CVwindlgDlg::OnInitDialog()
{

     ...

  CCreateContext pContext;
  /**
  * Note:CDialig derived pointer is converted to
  * CWnd pointer (a common base class for CDialog and CFrameWnd).
  * Thus casting it back to CFrameWnd is also easy.
  */
  CWnd* pFrameWnd = this;
  
  pContext.m_pCurrentDoc = new CMyDocument;
  pContext.m_pNewViewClass = RUNTIME_CLASS(CMyVw);
  CMyVw *pView =
     (CMyVw *) ((CFrameWnd*)pFrameWnd)->CreateView(&pContext);
  ASSERT(pView);
  pView->ShowWindow(SW_NORMAL);
  /**
  * After a view is created, resize that to 
  * have the same size as the dialog.
  */
  CRect rectWindow;
  GetWindowRect(rectWindow);
  /**
  * Leave a little space for border and title...
  */
  rectWindow.right += 15;
  rectWindow.top   -= 10;
  pView->MoveWindow(rectWindow);
  CString str(AfxGetApp()->m_lpCmdLine);
  /**
  * Note: "CMyVw" is a CHTMLView derived class to add some 
  *       spice to the view, I have provided a HTML page 
  *       to which it navigates when the dialog is up.
  */
  char strPath[255];
  ::GetCurrentDirectory(255,(LPSTR)(LPCSTR)strPath);
  strcat(strPath,"\\defaultpage.html");
  pView->Navigate(strPath);

         ....

  return TRUE;  // return TRUE  unless you set the 
                // focus to a control
}

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Download source - 38 KB
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