How to Create a Custom View to Wrap Your Own Control

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Environment: VC++ 5.0, SP3, Win95

One of the questions that I see posted to frequently is "How do I use my CListCtrl (or CTreeCtrl, CListBox, etc.) -derived control with a CListView (or CTreeView, etc.)?" As Zafir Anjum pointed out in his article "How do I use a derived CListCtrl with a CListView?", you don't. He provided the option of deriving your class from CListView or CTreeView, instead of the corresponding control class, and adding all of the desired customization to your newly derived view class.

Zafir's approach works with controls for which MFC provides a view class. However, if MFC doesn't provide a corresponding view class, or if you want to use your nice new control in both a view and a dialog, that solution is less than perfect. While you can use a CView-derived class in a dialog, it's cumbersome. Instead, I suggest that you leave all of the customization in the control-derived class and simply roll your own custom CView-derived class for it. It's really quite easy to do. The following example uses a CListCtrl-derived class.

Step 1: Derive a custom class from CView

This is easily done with the Class Wizard. Simply click on the "Add" button and choose "New class...". Select CView as the base class and enter a name for your derived class.

Step 2: Add a member variable of your custom control class

CMyListCtrl m_ListCtrl;

Step 3: Override the OnCreate() function of your CView-derived class

Override this function and add code to create your control.

// When OnCreate is called for the view, we create the
// CMyListCtrl instance that will occupy the client area 
// of the view.

int CMyListView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
 if (CView::OnCreate(lpCreateStruct) == -1)
 return -1;

 // Create the style

 // Create the list control.  Don't worry about specifying
 // correct coordinates.  That will be handled in OnSize()
 BOOL bResult = m_ListCtrl.Create(dwStyle, CRect(0,0,0,0), 
 this, IDC_LIST1); 

return (bResult ? 0 : -1);
} //OnCreate

Step 4: Override the OnSize() function of your CView-derived class

Override this function and add code to resize the control so that it occupies the entire client area of the CView-derived class.

// Override OnSize to resize the control to match the view
void CMyListView::OnSize(UINT nType, int cx, int cy) 
 CView::OnSize(nType, cx, cy);
 if (::IsWindow(m_ListCtrl.m_hWnd))
  m_ListCtrl.MoveWindow(0, 0, cx, cy, TRUE);

Step 5 (Optional): Override the OnInitialUpdate() function of your CView-derived class

If you wish, override this function and call any member functions of your control needed to initialize it. I usually create a member function in my control named Init() that reads in any data and adds it to the control. This function can be called either from CMyView::OnInitialUpdate() or CMyDialog::OnInitDialog().

void CMyListView::OnInitialUpdate() 


Download demo project - 36 Kb


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