How to add a glyph to a column on a TListView.

How do I add a Glyph to a Column on a TListView like windows explorer?  I want to do this to a TListview, preferably with some an API call.
I wish to add the Up/Down glyphs that you see in windows explorer when you sort a column.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Russell LibbySoftware Engineer, Advisory Commented:

Assign an ImageList to the listview's SmallImages property, then set the columns ImageIndex property through the object inspector, or via code:



Hope this is what your after, if not perhaps you could specify further

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Colin_DawsonAuthor Commented:
Close, but no cigar.  The image that I want is on the right hand side of the text.  Load Windows explorer and set the contents of a folder to "Details".  Now click on the filename header button.  You'll see an arrow pointing down.  Click again and the arrow will point up - and the list will be re-sorted.   I know how to make the list sort, so that's not a problem.   What I'm after is putting in the visual style, so that my tree view can behave more like the one in windows explorer.

The reason that I'm being so picky about this is that I want my Listview to be compatible with the Windows Themes in XP.
Colin_DawsonAuthor Commented:
Ok, I've done a little digging about on the net, and found the windows message that controlls the headers.  The message is  HDM_SETITEM.   I can see that the Sort items look new with Version 6 of Comctrl32. I'm now looking at how to implement it.
PMI ACP® Project Management

Prepare for the PMI Agile Certified Practitioner (PMI-ACP)® exam, which formally recognizes your knowledge of agile principles and your skill with agile techniques.

Colin_DawsonAuthor Commented:
OK, Getting closer still.

It doesn't mention that you need to add CommCtrl to your uses clause.    Now all I need to do is add the extra bit for the windows XP theme.
Colin_DawsonAuthor Commented:
Getting even closer now.  Got the icon working with XP, here's my variation on the code.  Notice that I needed to declare a couple of new Constants, these are missing from Delphi's API headers.

  Procedure SetColumnImage(List: TListView; Column, Image: Integer; ShowImage: Boolean);
    HDF_SORTDOWN = $200;
    HDF_SORTUP = $400;
   Align,hHeader: integer;

   hHeader := SendMessage(List.Handle, LVM_GETHEADER, 0, 0);
   with HD do
       case List.Columns[Column].Alignment of
         taLeftJustify:  Align := HDF_LEFT;
         taCenter:       Align := HDF_CENTER;
         taRightJustify: Align := HDF_RIGHT;
         Align := HDF_LEFT;

       mask := HDI_IMAGE or HDI_FORMAT;

       pszText := PChar(List.Columns[Column].Caption);

       if ShowImage then
         fmt := HDF_STRING or Align;

       If Image = 0
       Then fmt := fmt or HDF_SORTDOWN
       Else fmt := fmt or HDF_SORTUP;

       iImage := Image;

   SendMessage(hHeader, HDM_SETITEM, Column, Integer(@HD));

Now for the icing on the cake, I need to get the column itself to highligh in the way that windows explorer does in Windows XP.
Colin_DawsonAuthor Commented:
Having taken a little closer look I think it's only fair to ask about putting the shading onto the column as a seperate question.  Using the Columns.ImageIndex for the bitmap that I wanted was in the right direction for the correct solution, but as you can plainly see it's a hell of a long way short of the right answer.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Fonts Typography

From novice to tech pro — start learning today.