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how to count the order of a image list?

Posted on 2013-11-25
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Last Modified: 2013-11-26
Hello guys

I have a panel with 7 images, with this panel I can exchange the images among them, but I need that all those images be in the order by picture.

For each image I gave a number in its tag from 1 to 7

How can I count all images that is in my panel and knows if they are in correct order from 1 to 7 and not different of these?

I attached an example with a panel with images.

This is a part of this thread


Thread with card and drag and drop


thanks
Alexandre
OrderCount.zip
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Question by:hidrau
  • 3
4 Comments
 
LVL 28

Accepted Solution

by:
Sinisa Vuk earned 2000 total points
ID: 39676865
I use simple sorting of image position (X) and after that check is order of index (Tag) is ok.

function TForm1.IsCorrectOrder(pnl: TPanel): Boolean;
var
  i, j: Integer;
  ar: array of TPoint;
  pt: TPoint;
begin
  //default - if found incorrect one then flag will be set to False
  Result := True;
  SetLength(ar, pnl.ControlCount);

  for i := 0 to pnl.ControlCount-1 do
  begin
    ar[i].X := pnl.Controls[i].Left; //keep x pos
    ar[i].Y := pnl.Controls[i].Tag;  //keep assoc. tag
  end;

  //try to sort array
  for i := High(ar) downto Low(ar) do
  begin
    for j := Low(ar) to High(ar) - 1 do
    begin
      if ar[j].X > ar[j + 1].X then
      begin
        pt := ar[j];
        ar[j] := ar[j + 1];
        ar[j + 1] := pt;
      end;
    end;
  end;

  //check order - compare if first is lower than next
  j := 0;
  for i := Low(ar) to High(ar) do
  begin
    if (ar[i].Y < j) then
    begin
      Result := False;
      Break;
    end;
    j := ar[i].Y; //keep this
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if IsCorrectOrder(Panel3) then
    ShowMessage('ok')
  else
    ShowMessage('not ok');
end;

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Author Comment

by:hidrau
ID: 39677208
Very interesting, I am gonna check that.

Once again, Thanks Sinisav for your help. Yesterday I was thinking about that and I didn't get any solution. What you told me, open my mind about. :)
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LVL 1

Author Comment

by:hidrau
ID: 39679338
Your code is ok.
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LVL 1

Author Closing Comment

by:hidrau
ID: 39679438
Thanks very much Sinisav.

God always bless you :)
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