So, I have a requirement to flash a cell (or row) in a XamDataGrid when an error occurs on the underlying model for the cell\/row. I’m currently implementing this in code simply because I’ve inherited a new control from the XamDataGrid to handle all my requirements.<\/p>\n
I won’t go into the full implementation of the style, but suffice to say the bit that matters looks like this<\/p>\n
\r\nvar style = new Style(typeof (CellValuePresenter));\r\n\r\nvar trigger = new DataTrigger\r\n{\r\n Binding = new Binding("DataItem.IsValid"),\r\n Value = false\r\n};\r\n\r\nvar animation = new BrushAnimation\r\n{\r\n From = Brushes.LightPink,\r\n To = Brushes.Firebrick,\r\n Duration = TimeSpan.FromSeconds(0.2),\r\n AutoReverse = true\r\n};\r\n\r\nvar storyboard = new Storyboard\r\n{\r\n RepeatBehavior = RepeatBehavior.Forever\r\n};\r\n\r\nStoryboard.SetTargetProperty(animation, \r\n new PropertyPath(BackgroundProperty));\r\nstoryboard.Children.Add(animation);\r\n\r\nvar enterBeginStoryboard = new BeginStoryboard\r\n{\r\n Name = "flashingStoryboard",\r\n Storyboard = storyboard \r\n};\r\n\r\nstyle.RegisterName("flashingStoryboard", enterBeginStoryboard);\r\n\r\ntrigger.EnterActions.Add(enterBeginStoryboard);\r\ntrigger.ExitActions.Add(\r\n new StopStoryboard \r\n { \r\n BeginStoryboardName = "flashingStoryboard" \r\n });\r\n\r\nstyle.Triggers.Add(trigger);\r\n<\/pre>\nIn the above code we obviously create the style, with the target type of the CellValuePresenter. Then we’re using a trigger to detect when the view model’s IsValid property is false. This will cause our flashing animation\/storyboard to pulse the background brush from light pink to firebrick and back.<\/p>\n