Author: Tomas Rutkauskas

I want to display a hint on a TTreeView which varies from node to node. So I get 
the node over which the mouse is in the MouseMove event and change the Hint 
property of the TreeView.

Answer:

Our ElTree has own hints for every item and we did the following:

1   { ... }
2   if (FHintItemEx <> nil) or (not ShowHint) then
3   begin
4     Application.Hint := FOwner.FRealHint;
5     Hint := FOwner.FRealHint;
6     TSI := GetItemAt(message.XPos, message.YPos, IP, HCol);
7     if (TSI <> nil) then
8     begin
9       if (FHintItemEx <> TSI) then
10      begin
11        if Length(TSI.Hint) > 0 then
12        begin
13          Application.Hint := TSI.Hint;
14          Hint := TSI.Hint;
15        end;
16        if ShowHint and (not FInDragging) then
17        begin
18          P := ClientToScreen(SmallPointToPoint(message.Pos));
19  {$IFDEF VCL_5_USED}
20          Application.ActivateHint(P);
21  {$ELSE}
22          MoveMemory(@AMsg, @message, sizeof(AMsg));
23          TWMMouse(AMsg).XPos := -10000;
24          TWMMouse(AMsg).YPos := -10000;
25          Application.HintMouseMessage(Self, AMsg);
26          TWMMouse(AMsg).Pos := message.Pos;
27          Application.HintMouseMessage(Self, AMsg);
28  {$ENDIF}
29        end;
30      end;
31    end;
32  end;
33  { ... }