Borland6 C++ EventHandlers

[tokajac]

I have a problem with event handling from code.
I want to fill a StringGrid row with color. I did that with implementing the OnDrawCell Event.

I still don't know how to use that event!
On regular events i write code like:

  TMenuItem *itemPod = new TMenuItem(PopupMenu2);
   itemPod->OnClick = ClickingTheButton;

void __fastcall TForm1::ClickingTheButton(TObject *Sender)
{
....
}

---------------------------------------------------------------------------------
But in this situation i don't know which arguments should i use?!

  TMenuItem *itemPod = new TMenuItem(PopupMenu2);
   itemPod->OnClick = ????????????????;             <-----this is missing!

void __fastcall TUtakmica::StringGrid1DrawCell(TObject *Sender, int ACol,
      int ARow, TRect &Rect, TGridDrawState State)
{


   StringGrid1->Canvas->Brush->Color = clBlue;
   StringGrid1->Canvas->Font->Color = clRed;
   StringGrid1->Canvas->FillRect(Rect);

   StringGrid1->Canvas->TextRect(Rect, Rect.Left, Rect.Top, StringGrid1->Cells[ACol][ARow]);

}

I realized that this event is hapening on formCreate where StringGrid is.
I want to call this event only on button click and not on formCreate!
How can i do this!

Thx!

[eero_p]

You cannot assign OnClick -events with OnDrawXXX -events.

OnClick -event(s) always have one parameter, TObject *Sender. The function on the bottom has invalid parameters to be used to handle click-events.

Drawing -methods are called every time form is redrawn. If you want the drawing to happen only when you click a button, you can do it e.g. like this:

void __fastcall TForm1::ClickingTheButton(TObject *Sender)
{
    // set the callback function to the item you want to draw here
    StringGrid1->OnDrawCell = StringGrid1DrawCell;

    Form1->Invalidate();  // or: StringGrid1->Invalidate();

    // disable drawing
    StringGrid1->OnDrawCell = 0;
}