procedure WMRButtonDown(var Message: TMessage); message WM_RBUTTONDown; not work

In a form, I place a stringgrid, I wihs I am able to rightclick to highlight a row.

To achieve this, I use
procedure WMRButtonDown(var Message: TMessage); message WM_RBUTTONDown;

procedure TForm1.WMRButtonDown(var Message: TMessage);
begin
  postmessage(stringgrid1.Handle, WM_LBUTTONDown,mk_LButton, message.LParam);
  Application.ProcessMessages;
end;

But I found when I rightclick on the stringgrid, it doesn't go into the procedure.

But if I rightclick on the form, it goes into the procedure.

How to solve the problem?


Peter
petershaw8Asked:
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YunoshevConnect With a Mentor Commented:
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Grids, StdCtrls, Buttons;

type
  TForm1 = class(TForm)
    StringGrid1: TStringGrid;
    BitBtn1: TBitBtn;
    procedure BitBtn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 TMyGrid = class(TStringGrid)
   public
    { Public declarations }
    procedure WMRButtonDown(var Message: TMessage); message WM_RBUTTONDown;
 end;
var
  Form1: TForm1;

implementation

{$R *.DFM}


procedure TMyGrid.WMRButtonDown(var Message: TMessage);
begin
 
  You code there........
 
end;

procedure TForm1.BitBtn1Click(Sender: TObject);
Var Grid:TMyGrid;
begin
 Grid := TMyGrid.Create(Form1);
 Grid.Parent := Form1;
 Grid.Top := 10;
 Grid.Left := 10;

end;

end.
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scrapdogCommented:
Is there any reason you can't use StringGrid.OnMouseDown?
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h_mohsenianCommented:
dear petershaw8,

i think onmousemove can help u too ( like scrapdog ).
i just give u detailed:

procedure TForm1.StringGrid1MouseDown(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var i,j : longint;
    MyRect : TRect;
begin
  if (Button =  mbRight) then
  begin
    for i := 0 to StringGrid1.ColCount-1 do
    for j := 0 to StringGrid1.RowCount-1 do
    begin
    MyRect := StringGrid1.CellRect(i,j);
    if (MyRect.Top<=y) and (MyRect.Bottom>=y) and (MyRect.Left <=x) and (MyRect.right>=x) then
      showmessage('i ='+inttostr(i)+'j = '+inttostr(j));
      // now u can find selected cell by using
    end;
  end;
end;

i hope it can help u.

best regards
hamed

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gemartiCommented:
This sounds like you have accidently associated the event with the form instead of the string grid.

Check the OnMouseDown Event for the Form and see if it is pointing to the OnMouseDown Event for the String Grid. If it is then just delete it.

Then associate the OnMouseDown Event for the string grid with the event.

Just guessing.....
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