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Change text of field in twwdbgrid when selected (highlighted)

Posted on 2008-10-06
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Last Modified: 2012-08-13
Currently in OnDrawDataCell function of a TwwDBGrid, I change the color of the text in a particular field if certain criteria is meet.  For instance:

 if s = 'SomeCondition' then
        begin
          (Sender as TwwDBGrid).Canvas.Font.color := clBlue;
          (Sender as TwwDBGrid).Canvas.TextRect(rect,rect.left,rect.Top + 2, qry.FieldByName('Subject').asString);
        end;

I am changing the field in some rows to have blue text.  Not all rows have this text color.  However, when a row with the blue text is selected (highlighted) the text is hard to see.  This is becuase the row is "highligted" in a shade of blue too.  I would like the text to be aqua if the row is highlighted and blue if it is not.  Does anyone know how to do this?
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Question by:weimha
4 Comments
 
LVL 15

Assisted Solution

by:mikelittlewood
mikelittlewood earned 1000 total points
ID: 22651236
I don't use the WollToWoll components, but based on the standard DBGrid component it might be something like
   if s = 'SomeCondition' then
   begin
      if (Sender as TwwDBGrid).selectedField = field then
         (Sender as TwwDBGrid).Canvas.Font.color := clAqua
      else
         (Sender as TwwDBGrid).Canvas.Font.color := clBlue;
 
      (Sender as TwwDBGrid).Canvas.TextRect(rect,rect.left,rect.Top + 2, qry.FieldByName('Subject')
   end;

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Assisted Solution

by:swiatlo
swiatlo earned 1000 total points
ID: 22658389
TwwCustomDBGrid.OnCalcCellColors

TCalcCellColorsEvent = procedure(Sender: TObject; Field: TField; State: TGridDrawState; Highlight: Boolean; AFont: TFont; ABrush: TBrush) of object;

you have a Highlight: Boolean input param
use OnCalcCellColors instead of OnDrawDataCell
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Accepted Solution

by:
weimha earned 0 total points
ID: 22663489
I was able to use the "STATE" variable to get what I needed.  Thanks.
 if (gdSelected in State) then
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LVL 4

Expert Comment

by:Greg Rowland
ID: 24467857
This all works great. Only in my case the values are currency. The currency formatting  gets striped in the process.

What's up with that?
procedure TCostsf.wwDBGrid1DrawDataCell(Sender: TObject;
  const Rect: TRect; Field: TField; State: TGridDrawState);
begin
 
  with (Sender as TwwDBGrid), ClientDataSetCosts do begin
    if (Field.Value < 0) then
      Canvas.Brush.Color := 8421631
    else
      Canvas.Brush.Color := 8454016;
 
    Canvas.TextRect( rect, rect.left, rect.Top + 2, FieldByName( Field.FieldName).AsString);
 
  end;
end;

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