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Treeview with recursive checkboxes?

Posted on 2000-03-13
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Last Modified: 2008-02-26
HI, I am looking for a treeviewcomponent where you can enable checkboxes and they act recursive. I mean when you check the parent all the childnodes get checked as wel and visa versa. Anyone formiliar whit such a component?
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Question by:corpa
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7 Comments
 
LVL 12

Expert Comment

by:rwilson032697
ID: 2613488
You could use this one: http://www.lischke-online.de/TreeNT.html

It doesn't do the resursive action, but it is easy enough to do.

Cheers,

Raymond.
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LVL 10

Accepted Solution

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Lischke earned 100 total points
ID: 2615238
Well, Ray is right in that my TreeNT supports checkboxes, but is wrong about the recursive behaviour. Setting the check kind to tri-state causes dependent nodes (children or parents or both, whatever applies) to track check state changes of a node.

Ciao, Mike
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LVL 1

Expert Comment

by:AttarSoftware
ID: 2615503
ooOOooOOooOOooOOoo ;O)

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Author Comment

by:corpa
ID: 2617556
Hello Mike,

I've added the following in the onchecked event and it works just fine.

procedure TForm1.TreeNT1Checked(Sender: TObject; Node: TTreeNTNode);
var t : integer;
begin
  if node.HasChildren then
   begin
    for t := 0 to Node.Count-1 do
     begin
       Node.Item[t].CheckState := csChecked;
     end;
   end;
end;

So my problem is solved.
Since it is your component i'd like to give you the credits.
Thanks alot,
Pascal
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LVL 12

Expert Comment

by:rwilson032697
ID: 2618012
Mike - I'm sure TTreeNT won't do this recursive behaviour itself, will it? (ie: You need to right the handler above as I suggested...)

Cheers,

Raymond.
0
 
LVL 10

Expert Comment

by:Lischke
ID: 2618918
Well, the check concept is admittedly difficult to understand but it is as I said. When a node's check kind is tri-state (ctCheckboxGrayed), then changes to it are propagated down to all its children and up to its parent. Both ways are recursive. See also CheckParentCheckState for up-propagation and line 2122 ff. (method TTreeNTNode.SetCheckState) in TreeNT.pas (version 3.1 from Nov last year) for down propagation.

Ciao, Mike
0
 
LVL 12

Expert Comment

by:rwilson032697
ID: 2621162
Hi Mike,

Yes, I had a poke around in the source before I posted the comment. I saw what you mean about the tri-state behaviour...

Anyway, enough of this! TTreeNT rules OK! ;-)

Cheers,

Raymond.

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