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95
XamGrid changing Style of cells
posted

Hello,

I have following problem with XamGrid:
I want to use conditional formatting of cells with StyleScope="Row", according to a value of a cell in XamGrid should be changed the foreground colour (red) of the whole row.
 
I set the "conditional" column to values in order to set foreground colour in whole XamGrid to red. Everything was OK, until conditional formatting changed the style of visible rows.
When I scrolled to see other rows, I was surprised, because some of them were red, some of them were not. When I scrolled to the beginning to see the first rows, they
had the same problem! Other thing is, that it behaved indeterminately - for example I had 5 visible rows in XamGrid, but I had 7 rows in the whole grid. So I had to scroll to see
the 6. and 7. row, but sometimes the 6. row had the style not set, sometimes the 7. has the same problem, but the 6. was set.

After these troubles I tried to set foreground colour "directly" in code in this way:

Brush BlackForegroundBrush = new SolidColorBrush(Color.FromArgb(0xFF, 0, 0, 0));
Brush RedForegroundBrush = new SolidColorBrush(Color.FromArgb(0xFF, 0xFF, 0, 0));
Brush brush;

foreach (Row row in grid.Rows)
{
 VxSJEmisia emisia = row.Data as VxSJEmisia;
        if (emisia != null)
        {
         if (emisia.Valid)
                {
                 brush = BlackForegroundBrush;
                }
                else
                {
                 brush = RedForegroundBrush;
                }

  foreach (Cell cell in row.Cells)
         {
          if (cell != null && cell.Control != null)
                 {
                  cell.Control.Foreground = brush;
                 }
         }
        }
}

But the XamGrid had the same behavior.Surprisingly in some cases the cell.Control has null value in existing XamGrid !


Please, could somebody help me with this? Thanks a lot.      

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  • 21382
    posted

    You shouldn't scroll through all the rows and look at the controls in that manner because the cell control is virtualized and only attached to a cell if the cell is in view.  So if your row is off screen, the cell.Control would be null.

     

    What is the version number of the dll that you are using?  I recall there was bug with StyleScope.Row but I think it was resolved a while ago and in the Service Release.

     

    I am attaching a demo project showing how I tested it.  If you can modify this project to show the behavior, or have a simple project that shows the behavior, you can attach it here so we can look at what might be causing your issue.

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