Delphi: Custom hints for Tree View

Question

Is there a fast way to create 5 custom hints for 5 SubItems of Item of Tree View?

I have TreeView, 1 Item and 5 SubItems. I need a special hint for each SubItem (for first one - "F1", second one -"F2" and so on).

I can not apply this to my purpose: http://delphi.about.com/od/vclusing/a/treenode_hint.htm?

Answer 1

It sounds like you just want the OnHint event:

procedure TMyForm.TreeView1Hint(Sender: TObject; const Node: TTreeNode; var Hint: string);
begin
  Hint := Node.Text;
end;

Sometimes this method can be a bit crude and offer up a Node that you aren't obviously hovering over. If you want more control you can use GetNodeAt and GetHitTestInfoAt:

procedure TMyForm.TreeView1Hint(Sender: TObject; const Node: TTreeNode; var Hint: string);
var
  P: TPoint;
  MyNode: TTreeNode;
  HitTestInfo: THitTests;
begin
  P := TreeView1.ScreenToClient(Mouse.CursorPos);
  MyNode := TreeView1.GetNodeAt(P.X, P.Y);
  HitTestInfo := TreeView1.GetHitTestInfoAt(P.X, P.Y) ;
  if htOnItem in HitTestInfo then begin
    Hint := MyNode.Text;
  end else begin
    Hint := '';
  end;
end;

The definition of THitTests is as follows:

type
  THitTest = (htAbove, htBelow, htNowhere, htOnItem, htOnButton, htOnIcon,
    htOnIndent, htOnLabel, htOnRight, htOnStateIcon, htToLeft, htToRight);
  THitTests = set of THitTest;

As you can see this gives you a lot of fine grained control over when and what you show as a hint.