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VC++ Demo: Drop down Combo Box in CTreeCtrl and CListCtrl

By Rustam Hovhannisyan

 

Environment: VC++ 6

Derived classes from CTreeCtrl and CListCtrl with drop down list of choices for items text (combo box)

 

Derived classes from CListCtrl and CTreeCtrl allows user to open a list of choices for item's text. Double click or F4 keyboard button on item opens pre created list of strings. Useful when it's necessary to create a visual editable protocol trees and lists of fields (values must be one of the values from dropdown list, or may be entered by user).

It's very simple to use. Just follow steps below.

1. Create a new control by VC++  resource editor and specify a variable of CTreeCtrlEx (CListCtrlEx) type for that control or use Create() functions for dynamic creation of that controls.

2. Use InsertItemWithComboBox() function to insert a new item into control.

3. Use InsertComboBoxString() function to insert a new entry for item's combo box. Item must already created by InsertItemWithComboBox() function.

4. Use SetComboDroppedHeight() function to specify height for drop down combo box. Can be used at runtime. (No multithreading support and will not effect on any already visible combo boxes).

5. Use SetComboMinMaxWidths() function to specify minimum and maximum widths for all combo boxes in control. Can be used at runtime. (No multithreading support and will not effect on any already visible combo boxes).

 

Here is the partial interface for CListCtrlEx class (interface for CTreeCtrlEx is almost the same):

class EXCTRLSDDLEXP CListCtrlEx : public CListCtrl
{
	typedef CMap< int, int, CWnd*, CWnd* > mapItemToCB;
. . .
. . .
. . .
public:
  void  SetComboDroppedHeight( int iNewHeight );
  void  SetComboMinMaxWidths( UINT iNewMinWidth = 150,
                              UINT iNewMaxWidth = UINT_MAX );
  int   InsertItemWithComboBox( LPCTSTR lpszItem,
                                BOOL bEditableCombo );
  void  RemoveComboBox( int nItemRemoveFrom );
  void  RemoveAllComboBoxes();
  int   InsertComboBoxString( int nItemInsertTo,
                              LPCTSTR lpszItem,
                              int iIndex = -1 );
  BOOL  DeleteItem( int nItem );
  BOOL  DeleteAllItems();

. . .
. . .
. . .

};

Downloads

Download sources and demo project - 18,664 bytes

 

 

 

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