Re: DBGrid1.OnDrawColumnCell goes into infinite loop

From: Bjorge Sæther <bjorge@xxxxxxxx>
Date: Fri, 27 Jan 2006 11:04:35 +0100

Chris L. wrote:

Hi,
I use the following code in OnDrawColumnCell to embed DBCheckboxes into a
DBGrid. Everything works fine until I move (using mouse drag) a column with
a checkbox to another column location. The drawing of the active column
Checkbox going into infinite loop and causes the screen to freeze. There is
no code in OnColumnMoved method.

Any suggestion will be greatly appreciated.

[...]

  if (gdFocused in State) then
  begin
    if (Column.Field.FieldName = DBCheckBoxFiled.DataField) then
    begin
     //DBCheckBoxFiled.Left := Rect.Right + DBCheckBoxFiled.Width;
//Rect.Left + DBGrid1.Left + 2;
     //DBCheckBoxFiled.Left := 68; //Rect.Left + DBGrid1.Left +
DBCheckBoxFiled.Width;//Rect.Right + 6;
     DBCheckBoxFiled.Left := Round((Rect.Left + Rect.Right -
DBCheckBoxFiled.Width)/2) + 5; // the CheckBox "floats" on top of the
DBGrid, measured from the same Left starting point
     DBCheckBoxFiled.Top := Rect.Top + DBGrid1.top + 2;
     DBCheckBoxFiled.Width := 17; //Rect.Right - Rect.Left;
     DBCheckBoxFiled.Height := Rect.Bottom - Rect.Top;

DBCheckBoxFiled.Visible := True;

I'd guess there was something here - moving the checkbox around would possibly require another drawing of cells - etc...

Bjoerge
.

References:
- DBGrid1.OnDrawColumnCell goes into infinite loop
  - From: Chris L.

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