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bitmaps in lookupcombo drop down?

Posted on 2001-09-14
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Last Modified: 2013-12-03
Hi,

How do I display bitmaps in the drop down box of a TLookupCombo control?

As well, where can I get bitmaps of country flags(preferably 16x16 or 32x32).
 
Thanks,
Dion.
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Question by:Diono
7 Comments
 
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Expert Comment

by:fva
ID: 6482161
You could use a regular combo with OwnerDraw. Of course, the price will be a more complicated logic for filling and using the contents (no more DB awareness) but you'll get what you want (bitmaps). I think there's no easy way to derive/intercept regular behavior of the LookupCombo to obtain what you want.

As for the flag bitmaps, there are lots of sites with icons that probably contain the flags you want. Unfortunately I have no URL at hand but I'm sure you'll find someone to point you to some of them.

F.
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Expert Comment

by:ntony
ID: 6482168
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LVL 1

Expert Comment

by:malsoft
ID: 6482180
Diono,

Having looked at the code for the DBLookupCombo control, I'd agree with fva and say there's no really easy way of having an OwnerDraw variant of it. The control itself descends from TCustomControl, so it isn't even a true TComboBox (in fact the drop-down is actually a type of TListBox!).

You might have some luck in creating a descendant control and override the Paint method, but I don't see how you would access the items you'd need to draw, as these are declared as private.

As for the bitmaps, you could always have a look at http://www.flags.com
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Author Comment

by:Diono
ID: 6482657
Thanks guys, I have figured it out. I will still allocate the points to anybody who knows of an URL where I can get some decent bitmaps(ie maybe with some depth and a king of "flapping in the wind" effect) depicting country's of the world, especially Africa.

Thanks,
Dion.
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LVL 4

Expert Comment

by:fva
ID: 6482680
If you find a solution, maybe you want to post it here so that we or any later readers of this thread (when it'll be a PAQ) can benefit from your experience.

F.
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LVL 3

Expert Comment

by:marcoszorrilla
ID: 6483788
Try this example thats works fine.



procedure TForm1.FormCreate(Sender: TObject);
var
 Bmp: Tbitmap;
begin
        With Ttable.Create(nil) do
        try
          DabaseName :='XXXX';
          TableName:='Country.Db';
          Open;
            While not Eof do
            begin
            Bmp := TBitmap.Create;
              Try
                 Bmp.Assing(FieldByname('Flag'));
                 DbCombobox1.Items.AddObject(
                 FieldByName('country').AsString, Bmp);
               Except
               Bmp.Free;
               raise;
               end;
               Next
               end;
               finally
                 Free;
                 end;
end;




procedure TForm1.DBComboBox1DrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
begin
        With control as TDbComboBox, canvas do
        begin
         Fillrect(Rect);
         StretchDraw(
          Bounds(Rect.Left +2, Rect.Top, ItemHeight, ItemHeight),
          Tbitmap(Items.Objects[index]));
         Textout(Rect.left + ItemHeight + 6, Rect.Top, Items[Index]);
         end;
end;
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Accepted Solution

by:
grini earned 300 total points
ID: 6489613
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