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ListBox on EditView ...

Posted on 1998-10-08
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Last Modified: 2013-11-20
I ran the MFC Applicationwizard and used CEditView as base class instead of CView.
Now I want to attach a ListBox on it like in Visual Basic and Visual C++. That ListBox must foolow the caret position.
How can I do this?
BTW: I am novice in MFC and VC++ stuff.
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Question by:ndb
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by:Answers2000
ID: 1323092
1. Override PreCreateWindow for the CEditView.  In this make sure the WS_CLIPCHILDREN style is set

cs.style | = WS_CLIPCHILDREN

2. Add a member variable to the CEditView derived class
 CListBox  m_List

3. Override OnCreate for CEditView. Call m_List.Create to create the list box.  Make sure it has WS_CHILD style.  Make the list box visible using m_List.ShowWindow(SW_SHOW)

4. In Edit view, handle the reflected EN_SELCHANGE message (=EN_SELCHANGE).  This will tell you the selection/caret has moved within the edit control.  Use m_List.MoveWindow to move the list box

5. If the edit view has horizontal scrollbars you need to also handle =EN_HSCROLL, which will occur when the edit control is scrolled (even if caret doesn't move) and use m_List.MoveWindow

6. If the edit view has vertical scrollbar, handle also =EN_VSCROLL, similarly to #5

7. If you want the list box to disappear for a while, use m_List.ShowWindow(SW_HIDE)

8. If you want to the list box to reappear, use m_List.ShowWindow(SW_SHOW) ;
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Expert Comment

by:Answers2000
ID: 1323093
Let me know if you consider this an answer to your Q, or one of the steps is not clear enough
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Author Comment

by:ndb
ID: 1323094
How do I change the color and the borderstyle of that ListBox?
I know that the ListBox is ceated 'cause my mousepointer changes from chape but I can't see the ListBox.
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Answers2000 earned 800 total points
ID: 1323095
1. To add a border
You can add a simple border, by setting the style (in m_List.Create call) to WS_BORDER.

2. To change color
i) The best thing to do is to derive a class from CListBox (use app wiz to generate a skeleton class derived from CListBox say CMyListBox)
ii) Change m_List variable from CListBox type to CMyListBox
iv) In CMyListBox add a member variable for a brush, say m_hBrush
v) In CMyListBox constructor create the brush to desired color, e.g.
      m_hBrush = CreateSolidBrush( RGB(0,0,128) ) ; // dark blue
vi) In CMyListBox destructor delete the brush, e.g.
   DeleteObject( m_hBrush)
vii)  In CMyListBox respond to =WM_CTLCOLOR message (see TN062 for more info on how this works).change the color and return the brush, e.g.
HBRUSH CMyListBox::CtlColor(CDC* pDC, UINT nCtlColor)
{
      pDC->SetBkColor( RGB(0,0,128) ) ; // dark blue
      pDC->SetTextColor( RGB(0,255,255) ) ; // cyan

      return m_hBrush ;
}


3. Also Make sure the list box has a reasonable size for width and height


4. Also make sure the list box contains some stuff.  For example after calling m_List.Create in the edit view, add a couple of strings, e.g.

m_List.AddString( "Hello" ) ;
m_List.AddString( "World" ) ;

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Expert Comment

by:Answers2000
ID: 1323096
Typo in my prev comment

>> You can add a simple border, by setting the style (in m_List.Create call) to WS_BORDER.

should have said

You can add a simple border, by setting the style (in m_List.Create call) to include WS_BORDER. (styles are separated by |)
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