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Editing or addings to a Tlistbox at runtime

Hey,

How would I add to a Tlistbox at runtime so if I clicked a Button it would add a word to the highlited item for example ...

List box item before clicked on...

Hello

Listbox Item highlighted

Button Clicked

Listbox Item added hi to ...

Hello Hi



Get my drift?

Cheers,

Computer Programer
0
computerprogramer
Asked:
computerprogramer
  • 6
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2 Solutions
 
Ferruccio AccalaiSenior developer, analyst and customer assistance Commented:
procedure TForm1.Button1Click(Sender: TObject);
begin
ListBox1.Items[ListBox1.itemindex] := ListBox1.Items[ListBox1.itemindex]+ ' HI';
end;

F68 ;-)
0
 
computerprogramerAuthor Commented:
Hey,

Also for 10 more points can you tell me how to change the colour with that?

Cheers
0
 
Ferruccio AccalaiSenior developer, analyst and customer assistance Commented:
wich color? Selection color or text color?
0
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computerprogramerAuthor Commented:
Text Colour
0
 
Ferruccio AccalaiSenior developer, analyst and customer assistance Commented:
I'm not sure about your needs, btw to customize the items color you have to set the Listbox1.Style to lbOwnerDrawFixed and write an OnDrawItem event...

Something like this:

procedure TForm1.Button1Click(Sender: TObject);
begin
ListBox1.Items[ListBox1.itemindex] := ListBox1.Items[ListBox1.itemindex]+ ' HI';
end;

procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
begin
if Pos(' HI',Listbox1.items[index]) > 0 then
Listbox1.Canvas.Font.Color := clred
else
ListBox1.canvas.Font.Color := clblack;
ListBox1.Canvas.TextRect(Rect, Rect.Left, Rect.Top,
     ListBox1.Items[Index]);
end;
0
 
computerprogramerAuthor Commented:
Ok im rasing it to 50 because im not sure if you can do this or not,

I just want it so when you click on the button the text colour changes to red

cheers thanks for your help
0
 
Ferruccio AccalaiSenior developer, analyst and customer assistance Commented:
Well, the code posted above do that. Clicking on the button HI is added and the font changes to red. Do you mean this?
0
 
computerprogramerAuthor Commented:
This sounds kinda stupid but can you make it so just on button click it changes the highlighted item to red ,

Sorry for the hassle
0
 
Ferruccio AccalaiSenior developer, analyst and customer assistance Commented:
Have you tried the code above?
0
 
JaccoCommented:
Ferruccio68: You could store the color in Items.Objects[...] ;-)
0
 
Ferruccio AccalaiSenior developer, analyst and customer assistance Commented:
I know it Jacco, but the fact is that until now i've not exactly understood what he need: if just a color change in onclick and then let say so the color or just the color of the selected....
Well, give me a hand with your suggestion :))
0
 
computerprogramerAuthor Commented:
All i want it on click the colour of the selected item changes
0
 
EddieShipmanCommented:
Make this change:

procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
begin
  // Only change to red if selected and containing the word 'HI'
  // If you want all selected to be red,
  // remove the first condition in the if statement.
  if (Pos(' HI',Listbox1.items[index]) > 0)  and
     (gdselected in State) then
    Listbox1.Canvas.Font.Color := clRed
  else
    ListBox1.Canvas.Font.Color := clWindowText;

  ListBox1.Canvas.TextRect(Rect, Rect.Left, Rect.Top,
     ListBox1.Items[Index]);
end;
0
 
EddieShipmanCommented:
OH, do you mean you want the BACKGROUND of the item to be red?
0
 
JaccoCommented:
Okay, here is my 50 ct:

procedure TForm1.Button1Click(Sender: TObject);
begin
  ListBox1.Items.Add('test');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  if ListBox1.ItemIndex >= 0 then
  begin
    ListBox1.Items.Objects[ListBox1.ItemIndex] := Pointer(clRed);
    ListBox1.Invalidate;
  end;
end;

procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState);
begin
  with TListBox(Control) do
  begin
    Canvas.FillRect(Rect);
    Canvas.Font.Color := TColor(Items.Objects[Index]);
    Canvas.TextRect(Rect, Rect.Left + 2, Rect.Top,  Items[Index]);
  end;
end;

Attach the DrawItem to the ListBox.OnDrawItem and make sure you set ListBox.Style to lbOwnerDrawFixed

Regards Jacco
0
 
computerprogramerAuthor Commented:
Thankyou both Jacco and Ferruccio68  you both got what answers I wanted.
I split the points in half,

Cheers,

And thanks everyone else,

Computer Programer
0

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