how can a listview's header show a triangle when i sort items

Question

hi,

I have window with ListView control. The ListView control has few
columns which user can sort by clicking the column header.

I want the column header have the small triangle indicator of sort order.
How can I implement that?

Thanks

Answer 1

I have window with ListView control. The ListView control has few
columns which user can sort by clicking the column header.

I want the column header have the small triangle indicator of sort order.
How can I implement that?

I don't know if there's a built in method, but I did this years ago.
This is just fragments of code from a project - so just treat it as
hints of how it can be done!

Initialisation...

    * Create an image list for the sort icons for the list's
header control *
    {
        * Initialise the image list for the sort icons *
        m_SortIcons.Create( 8, 8, ILC_MASK, 2, 2 );
        HICON hIco1;
        hIco1 = static_cast<HICON>( LoadImage(
AfxGetInstanceHandle(), MAKEINTRESOURCE( IDI_UP ), IMAGE_ICON, 0, 0,
LR_DEFAULTCOLOR ) );
        m_SortIcons.Add( hIco1 );
        hIco1 = static_cast<HICON>( LoadImage(
AfxGetInstanceHandle(), MAKEINTRESOURCE( IDI_DOWN ), IMAGE_ICON, 0, 0,
LR_DEFAULTCOLOR ) );
        m_SortIcons.Add( hIco1 );

        m_List.GetHeaderCtrl()->SetImageList( &m_SortIcons );
    }

Removing the sort indicator...

    * Remove the existing sort indicator from the list's header
control *
    HDITEM hdi;
    CHeaderCtrl * pHeader = m_List.GetHeaderCtrl();

    if ( m_SortCol != -1 )
    {
        * Remove the existing sort indicator *
        hdi.mask= HDI_FORMAT;
        hdi.fmt= HDF_LEFT | HDF_STRING;
        pHeader->SetItem( m_SortCol, &hdi );
    }

Setting the sort indicator...
    * Set the sort indicator in the list's header control *
    hdi.mask= HDI_IMAGE | HDI_FORMAT;

    if ( m_bAscending )
    {
        hdi.iImage= 0;    // Ascending
    }
    else
    {
        hdi.iImage= 1;    // Descending
    }

    hdi.fmt= HDF_LEFT | HDF_IMAGE | HDF_STRING |
HDF_BITMAP_ON_RIGHT;
    pHeader->SetItem( col, &hdi );

Dave

Answer 2

hi dave,

thanks for your code.i have solved this problem yesterday.Your code base on MFC,my App base on Win32,so i need transform your code to code i can use,i didn't do this.

leo

Answer 3

 

Hi LeoGaGa,

 

I shall be pleased will you can share your code of solving this issue.

 

Have a nice day!

Jesse

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Answer 4

Hi Jesse,

the code has been showed as below:

   HD_ITEM hditem = {0};

  hditem.mask = HDI_FORMAT | HDI_BITMAP;
  HWND hHdr = ListView_GetHeader(_listView);
  ::SendMessage(hHdr, HDM_GETITEM, iIndex, (LPARAM)&hditem);  //iIndex represent the index of column be clicked

  hditem.fmt &= ~(HDF_BITMAP | HDF_BITMAP_ON_RIGHT);

   hditem.fmt |= HDF_BITMAP | HDF_BITMAP_ON_RIGHT;  
   if(_ascending)  //_ascending sort
    hditem.hbm = LoadBitmap(GetModuleHandleA(NULL), MAKEINTRESOURCE(IDB_ITEM_IMAGE_UP));
   else
    hditem.hbm = LoadBitmap(GetModuleHandleA(NULL), MAKEINTRESOURCE(IDB_ITEM_IMAGE_DOWN));

    ::SendMessage(hHdr, HDM_SETITEM, iIndex, (LPARAM)&hditem);

Kindest regards

Leo