TListView with CheckBoxes and SubItemImages

Question

Using the standard TListView component (ViewStyle = vsReport), I have attached a TImageList and have successfully added images to both the first column (Item.ImageIndex := 0) and to the subsequent columns (Items[0].SubItemImages[1] := 1).

If I then set the CheckBoxes property to True, the images on SubItems disappear. The main image remains (the one set by Item.ImageIndex) but the SubItems lose their images.

I have also noticed that the OnGetSubItemImage event doesn't fire when CheckBoxes = True

Does anyone know of a way around this?

Answer 1

Well this doesn't help particularly, but the TMS TAdvListView component handles it with its SubImages property. Set this to True and I can have Checkboxes and sub item images. I'm sure there's a lot of good work going on behind the scenes. At least this moves me forward.

Answer 2

this is a very old bug, when you activate the CheckBoxes property would disable the LVS_EX_SUBITEMIMAGES and LVS_EX_INFOTIP styles on the TListView control.

you can use this workaround for fix this bug.

1) Disable the checkbox property in the listview

2) Put this code (Tested in Delphi 7 and windows 7) in your form .

const
  LVM_FIRST =$1000;
  LVS_EX_SUBITEMIMAGES         = $00000002;
  LVM_SETEXTENDEDLISTVIEWSTYLE = LVM_FIRST + 54;
  LVM_GETEXTENDEDLISTVIEWSTYLE = LVM_FIRST + 55;


function ListView_GetExtendedListViewStyle(LVWnd: HWnd): DWORD;
begin
  Result := SendMessage(LVWnd, LVM_GETEXTENDEDLISTVIEWSTYLE, 0, 0);
end;

function ListView_SetExtendedListViewStyle(LVWnd: HWnd; ExStyle: LPARAM): DWORD;
begin
  Result := SendMessage(LVWnd, LVM_SETEXTENDEDLISTVIEWSTYLE, 0, ExStyle);
end;


procedure TForm1.FormCreate(Sender: TObject);
begin
ListView1.Checkboxes:=True;//Activate the checkbox in the listview
ListView_SetExtendedListViewStyle(ListView1.Handle,ListView_GetExtendedListViewStyle(ListView1.Handle) OR LVS_EX_SUBITEMIMAGES); //Activate the LVS_EX_SUBITEMIMAGES style.
end;

3) and the final result is