Comments

• Delete items solved

  Posted by Legacy on 10/19/1998 12:00am

  Originally posted by: Mihai

  Hi, 
  
   The idea is to store all deleted items. Else, you need to make big changes. Anyway with this work. You
  need to make some changes into source files: TreeCtrlMultiColumn.h and into TreeCtrlMultiColumn.cpp.
  
   So: First add a new member as:
  
   private: CMap<int,int,BOOL,BOOL> m_mapItemDeleted;
  
   Update the folowing functions with the current body:
  
  // 1.
  
  // Function name	: CTreeMultiColumnCtrl::ItemHasChildren
  
  // Description	    : Return TRUE if item iItem has at least one children
  
  // Return type		: BOOL 
  
  // Argument 	: int iItem
  
  BOOL CTreeMultiColumnCtrl::ItemHasChildren(int iItem)
  
  {
  
  	int key = -1;
  
  	int value = -1;
  
  	POSITION position = m_mapParents.GetStartPosition();
  
  	while (position)
  
  	{
  
  		m_mapParents.GetNextAssoc(position, key, value);
  
  		if (!IsDeleted(value))
  
  			if (!IsDeleted(key))
  
  				if (value == iItem)
  
  					return TRUE;
  
  	}
  
  	return FALSE;
  
  }
  
  // 2.
  
  // Function name	: CTreeMultiColumnCtrl::GetFirstItemChild
  
  // Description	    : Return the index of first item child of nItem
  
  // Return type		: int 
  
  // Argument 	: int nItem
  
  int CTreeMultiColumnCtrl::GetFirstItemChild(int nItem)
  
  {
  
  	m_nLastItemFind = -1;
  
  	m_nLastItemFound = nItem;
  
  	return GetNextItemChild();
  
  }
  
  //3.
  
  // Function name	: CTreeMultiColumnCtrl::GetNextItemChild
  
  // Description	    : Return the index of next item child of nItem
  
  // Return type		: int 
  
  int CTreeMultiColumnCtrl::GetNextItemChild()
  
  {
  
  	m_nLastItemFind++;
  
  	while (IsDeleted(m_nLastItemFind) || ((m_nLastItemFind < m_listItems.GetItemCount()) &&
  (GetItemParent(m_nLastItemFind) != m_nLastItemFound)))
  
  		m_nLastItemFind++;
  
  	if (m_nLastItemFind < m_listItems.GetItemCount())
  
  		return m_nLastItemFind;
  
  	return -1;
  
  }
  
  // 4.
  
  // Function name	: CTreeMultiColumnCtrl::IsLastChildren
  
  // Description	    : Check if iItem is last children
  
  // Return type		: BOOL 
  
  // Argument 	: int iItem
  
  BOOL CTreeMultiColumnCtrl::IsLastChildren(int iItem)
  
  {
  
  	int iParent = GetItemParent(iItem);
  
  	int cItem = m_listItems.GetItemCount();
  
  	int i = iItem + 1;
  
  	while (i < cItem)
  
  	{
  
  		if (!IsDeleted(i))
  
  			if (!IsDeleted(GetItemParent(i)))
  
  				if (GetItemParent(i) == iParent)
  
  					return FALSE;
  
  		i++;
  
  	}
  
  	return TRUE;
  
  }
  
   Now, you need to insert two new functions:
  
   // Function name	: CTreeMultiColumnCtrl::Delete
  
  // Description	    : 
  
  // Return type		: BOOL 
  
  // Argument 	: int nItem
  
  // Argument 	: BOOL bRecurse
  
  BOOL CTreeMultiColumnCtrl::Delete(int nItem)
  
  {
  
  	int nTrueItem = GetItemData(nItem);
  
  	if (!ItemHasChildren(nTrueItem))
  
  	{
  
  		m_bInsideCode++;		
  
  			DeleteItem(nItem);
  
  			m_mapItemDeleted[nTrueItem] = TRUE;
  
  			int lItem = max(0, nItem - 1);
  
  			RedrawItems(lItem, lItem);
  
  		m_bInsideCode--;		
  
  		return TRUE;
  
  	}
  
  	return FALSE;
  
  }
  
  // protected function
  
  // Function name	: CTreeMultiColumnCtrl::IsDeleted
  
  // Description	    : 
  
  // Return type		: BOOL 
  
  // Argument 	: int nItem
  
  BOOL CTreeMultiColumnCtrl::IsDeleted(int nItem)
  
  {
  
  	BOOL bValue = FALSE;
  
  	m_mapItemDeleted.Lookup(nItem, bValue);
  
  	return bValue;
  
  }
  
  Sincerely, Mihai Filimon
  
  P.S. I will make the changes to site.
  

  Reply

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