List Control with OLE Drag ‘& Drop

Features

This extended list control allow OLE drag and drop between list controls. The programmer can enable/desable
local drag and drop of list items inside the same control, automatic scrolling and the removing of
dragged items from the source list.

Control Usage

1. Initialize the OLE libraries in the application InitInstance member function:

BOOL CDdDemoApp::InitInstance()
{
 AfxEnableControlContainer();
#ifdef _AFXDLL
 // Call this when using MFC in a shared DLL
 Enable3dControls();
#else
 // Call this when linking to MFC statically
 Enable3dControlsStatic();
#endif

 //-------------------------
 // Initialize OLE libraries
 //-------------------------
 if (!AfxOleInit())
  return FALSE;

2. Insert the #include “DDListCtrl.h” in the dialog C++ file which contains the List Ctrls.
3. In the OnInitDialog member function of the dialog, initialize and customize the list controls initialization according to the following template:

BOOL CDdDemoDlg::OnInitDialog()
{
 CDialog::OnInitDialog();

 //.................................

 //---------------------------->
 // 1 - Subclass the list controls
 //----------------------------
 m_listVars.SubclassDlgItem(IDC_LIST_VAR, this);
 m_listRows.SubclassDlgItem(IDC_LIST_ROWS, this);
 m_listCols.SubclassDlgItem(IDC_LIST_COLS, this);
 m_listData.SubclassDlgItem(IDC_LIST_DATA, this);
 m_listPages.SubclassDlgItem(IDC_LIST_PAGES, this);

 //--------------------------------------------------------------
 // 2 - Initialize the List view controls
 //--------------------------------------------------------------
 CString s(TCHAR('M'),29);
 int len = m_listVars.GetStringWidth(s)+15;
 LV_COLUMN lvC;
 lvC.mask = LVCF_FMT | LVCF_WIDTH;
 lvC.fmt  = LVCFMT_LEFT;  // Left-align column
 lvC.cx   = len;          // Width of column in pixels
 if (m_listVars.InsertColumn(0,&lvC) == -1)
  return FALSE;

 m_listVars.DeleteAllItems();

 m_listVars.SetLocalDD(FALSE);   // Disable local Drag&Drop
 m_listVars.SetScrolling(FALSE); // and auto scrolling

 // Create a column for the row variables list view control.
 if (m_listRows.InsertColumn(0,&lvC) == -1)
  return FALSE;

 m_listRows.DeleteAllItems();

 // Create a column for the column variables list view control.
 if (m_listCols.InsertColumn(0,&lvC) == -1)
  return FALSE;

 m_listCols.DeleteAllItems();

 // Create a column for the data variables list view control.
 if (m_listData.InsertColumn(0,&lvC) == -1)
  return FALSE;

 m_listData.DeleteAllItems();

 // Create a column for the page variables view control.
 if (m_listPages.InsertColumn(0,&lvC) == -1)
  return FALSE;

 m_listPages.DeleteAllItems();

 //------------------------------------------
 // 3 - Set the content of the list view controls
 //------------------------------------------
 CWordArray aVars;
 int size = m_pSelectInfo->m_asNames.GetSize();
 aVars.SetSize(size);
 // Initially the list of available variables contains all variables
 for (int i=0; i<size; i++)
  aVars[i] = i;

 // Fill the list of variables
 m_pData->FillListCtrl(m_listVars, aVars);
 m_pData->FillListCtrl(m_listRows, m_pSelectInfo->m_aRowsVar);
 m_pData->FillListCtrl(m_listCols, m_pSelectInfo->m_aColsVar);
 m_pData->FillListCtrl(m_listData, m_pSelectInfo->m_aDataVar);
 m_pData->FillListCtrl(m_listPages, m_pSelectInfo->m_aPagesVar);

 //-----------------------------------------------
 // 4 - Initialize the list controls for Drag&Drop
 //-----------------------------------------------
 m_listVars.Initialize();
 m_listRows.Initialize();
 m_listCols.Initialize();
 m_listData.Initialize();
 m_listPages.Initialize();

 return TRUE;
}

Downloads

Download source – 9 Kb

Download demo project – 32 Kb