How can I make a Treeview with multi-checkbox selection

I like very much the treeview object, but I would like to add one additionnal
feature to it.  Imagine a regular treeview with expand and collapse icons.
When you select one or multiple nodes, you have an additionnal checkbox icon beside
the expand and collapse.  So you can save only those selected with the checkbox.

 [  ]-[+]-Project 1
       |
 [X]-[-]-Project 2
          |
        [  ]-[+]-Application 1
               |
        [X]-[-]-Application 2      
sylvainlAsked:
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LischkeConnect With a Mentor Commented:
Hi sylvainl

I'm the aouthor of TreeNT mentioned on this page and I managed to have checkboxes by listening to mouse down events and updating the stateimage. You can do it simpler.

Write an event handler for OnCollapsed and OnExpanded and use this to update a specific StateImage icon:

procedure TMainForm.TreeView1Collapsed(Sender: TObject; Node: TTreeNode);
begin
  Node.StateIndex:=ckCheckEmpty;
end;

where you define some constants like:

const ckEmpty         = 0; //: an empty image (state index must be > 0)
      ckCheckEmpty    = 1; //: an empty checkbox
      ckCheckChecked  = 2; //: a checkbox with a cross
      ckCheckDisabled = 3; //: a grayed and empty checkbox
      ckCheckGrayed   = 4; //: a grayed checkbox with a cross
      ckRadioEmpty    = 5; //: an empty radio button (circle)
      ckRadioChecked  = 6; //: a radio button with a filled circle
      ckRadioDisabled = 7; //: a grayed and empty radio button
      ckRadioGrayed   = 8; //: a grayed radio button with a filled circle

which correlate directly to images in a state image list you have to create and assign to your tree.

Nodes without an state image get 0 (zero) as stateindex, so they don't reserve any space for the image.

Hope this helps,

Ciao, Mike
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sylvainlAuthor Commented:
Edited text of question
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nileqCommented:
Hi sylvainl:
That's not an easy question. You would have to create a new component derived out of TCustomTreeView, and modify the TTreeNode object. Adding the property TTreeNode.Checked isn't verry difficult but adding the graphic capabileties sertainly demands attention.
I'll see what I can do, if I have the time :)

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JimBob091197Commented:
The TTreeView component supports another image which should work.  Look up "StateImages" in the help file.  From Delphi's help file: "The state image appears as an additional image to the left of the item's icon."

Cheers,
JB
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MatveyCommented:
You don't have to make them yourself - there are already some trees like this:

http://bes.trendline.co.il/torry/vcl/lbcb/chkoutl.zip
"Checkoutline is just the same as the standard outline control, but has the ability to check the items."

http://bes.trendline.co.il/torry/vcl/lbcb/mstree.zip
"A TreeView that is capable of multi-selecting." (Can be the same as checkboxes...)

http://bes.trendline.co.il/torry/vcl/lbcb/treent10.zip
"TreeNT is much enhanced treeview control, which is really fast and has many new features like checkboxes, auto scrolling, hot tracking, single expand, node hints and much more."
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MatveyCommented:
http://bes.trendline.co.il/torry/vcl/lbcb/outlplus.exe
"Allows you to specify different glyphs for each node in the outline."
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ZifNabCommented:
Hi all ... everything is said at the moment.
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rickpetCommented:
I would just make a glyph of a checkbox and use an overlay of a check.  Check out TImageList and overlays...

Rick
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MatveyCommented:
Hi Mike, I guess component writrers have their fans too ;-) So I'm one. Good thing someone plants trees here :)
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LischkeCommented:
Hi Matvey,

I'm pleased to read that...:-) Well, TreeNT is going to be used in lots of (even commercial) products soon. BTW: Version 2.1 is almost ready. If anyone wants a free copy, just send a mail...

Ciao, Mike
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MatveyCommented:
Sure, I'd love to receive the new ver. Have you seen the Eugine Mayevski tree? BWPack? A good one too. I know it because I know Eugine... (http://bes.trendline.co.il/torry/vcl/packs/bwpack.zip)

bosism@netvision.net.il (my email)
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ZifNabCommented:
Mike, can you send a demo too? Tom.Deprez@uz.kuleuven.ac.be 10x!
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MatveyCommented:
Zif, Mike, the BWPack also contains lots of cool stuff, a tree I mean. My advice...
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ZifNabCommented:
thanks, matvey, I'll a look.
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LischkeCommented:
Matvey, ZifNab,

the code is on the way to your mail addresses.

I'd also a lokk at the BWPack, but the tree is without source, so it is not useful for me.

Ciao, Mike
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ZifNabCommented:
Thank you very much Lischke.

Forgot to mention... Somebody already looked at the TeeTree? New component form TeeChart? Zif.
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MatveyCommented:
Thanks! I'll look at it right away.

BWPack - I think it's with sources. You can email the author of course if there are no sources inside - what's the reason to hide them if it's freeware anyway?
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