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Add items to TListBox in REVERSE order

Posted on 1998-10-09
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Last Modified: 2011-09-20
I know that to add an item to a TListBox, one simply uses...

ListBox1.Items.Add(Edit1.Text);

However, this adds the new item to the END of the list.  What I am trying to accomplish is to place the new item at the BEGINNING of the list.

IOW, I would like to see this...

ListBox1.Items.Add('1');
ListBox1.Items.Add('2');
ListBox1.Items.Add('3');

...result in the following display in the ListBox...

3
2
1

...instead of the current behavior, which gives me...

1
2
3

What is the best way to accomplish this reverse order?
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Question by:Softtech
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4 Comments
 
LVL 1

Accepted Solution

by:
ow earned 240 total points
ID: 1342380
Hi softtech,

you may use a seperate stringlist first, where you can insert strings at any positon.
Then deliver it to the listbox:

var
  StringList :tStringlist;
  Listbox1 :tListBox;
.
StringList.Insert(0, '1');
StringList.Insert(0, '2');
StringList.Insert(0, '3');
.
ListBox1.Items := StringList;

regards
  ow
0
 
LVL 1

Expert Comment

by:borup
ID: 1342381
Nice solution ;-)
0
 

Author Comment

by:Softtech
ID: 1342382
I still have to .Create and .Free the TStringList, don't I?

Out of curiousity, if I wanted to have take the contents of the StringList, and have it fill the TListBox, would I simply do this?...

MyStringList := TStringList.Create;
.
.
ListBox1.Items.Assign(MyStringList)

???
0
 
LVL 1

Expert Comment

by:ow
ID: 1342383
Softtech,

you are right at all.
You must create and free the stringlist and you can use either "ListBox.Items.Assign(StringList)" or "ListBox.Items := StringList".
Items.Assign is just the method, which is called, when you write to property tListbox.Items.

regards
  ow
0

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