click on listbox or combobox: delphi code

click on listbox or combobox

when i click on a delphi component such as combobox and treeview, listbox ect, they show a standerd blue hoverover on my application. How can i change its color? or get rid of the color blue.

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This was posted by Peter Below in the Borland newsgroups way back on Fri, 15 Jun 2001:
[quote]
The menu colors are a system setting which the user can specify in the display properties applet. You should not
mess with that. One can do so when the app is activated and restore the old setting when it is deactivated or
closed, but that is also not very satisfactory since the change still hits all other running apps as well and in the case
of changes to the color scheme it also may take a noticable delay to take effect.

If you want to play with it: drop a TApplicationEvents component on the form, connect the OnActivate and
OnDeactivate events of it to handlers, add one for the forms OnClose event,modify as below.
[/quote]

I have modified it to show how to change the highlight color.


  private
    { Private declarations }
    FOldHighlightColor: TColorRef;
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.DFM}
 
procedure TForm1.ApplicationEvents1Activate(Sender: TObject);
Var
  newcolors: Array [0..0] of TColorRef;
  indices:   Array [0..0] of Integer;
begin
  FOldHighlightColor := ColorToRGB( clHighlight );
  // Change these to the colors you want
  newcolors[0] := ColorToRGB( clYellow );
  indices[0]   := COLOR_HIGHLIGHT;
  SetSysColors( 1, indices, newcolors );
end;
 
procedure TForm1.ApplicationEvents1Deactivate(Sender: TObject);
Var
  newcolors: Array [0..0] of TColorRef;
  indices:   Array [0..0] of Integer;
begin
  newcolors[0] := FOldHighlightColor;
  indices[0]   := COLOR_HIGHLIGHT;
  SetSysColors( 1, indices, newcolors );
end;
 
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  ApplicationEvents1Deactivate(self);
end;

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procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState); Var R: TRect; begin R := Rect; // just incase we wanted to change the borders, etc if odSelected in State then begin (Control as TListbox).Canvas.Brush.Color := clYellow; // $00895F0A; (Control as TListbox).Canvas.Font.Color := clBlack; end else begin (Control as TListbox).Canvas.Brush.Color := clWindow; (Control as TListbox).Canvas.Font.Color := clRed; end; (Control as TListbox).Canvas.FillRect(R); // fills with brush colour (Control as TListbox).Canvas.TextOut(R.Left, Rect.Top, (Control as TListbox).Items[Index]); // uses font colour

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