Hi,
I have a masterdetail grid for which I need to apply a gradient of background colours for the detail as well as particular columns in the master grid.
I tried using ThreeColorConditionalFormatting for it, but the colour shown as the cell background wasn’t really a representation of the colour between the maximum and minimum values.
As show in the attached example the weight column in the master has a value of 16. And I need the colour of this cell to be represented by where it lies between the maximum and the minimum weight.
But it always shows me a green colour.
I also tried using the Cellcontrolattached event and having my own gradient generator to set the back colour but in the case of a large dataset the scrolling doesn’t reflect the colour and a grey background appears.
Is there any other way of achieving this?
Thanks for the quick reply. I used the approach you mentioned and it works.
Thanks Again
Yes, you can achieve this with a CustomConditionalFormatRule.
Basically, you just need a way of setting the Median, Maxium and Minimum values for the Rule, as you can't do them through a binding.
Probably the simplest way to do this, is through deriving your own ThreColorScaleConditionalFormatRule
Just follow the steps below:
1. Derive from ThreeColorScaleConditionalFormatRule:
public class CustomThreeColorScaleConditionalFormatRule : ThreeColorScaleConditionalFormatRule
{
protected override IConditionalFormattingRuleProxy CreateProxy()
return new CustomThreeColorScaleConditionalFormatRuleProxy() { Median = this.MedianValue, Maximum = this.MaximumValue, Minimum = this.MinimumValue };
}
2. Derive from ThreeColorScaleConditionalFormatRuleProxy (this is the workhorse that performs all of the logic, here, we'll need to set the Median, Maximum, and Minimum values before we execute:
public class CustomThreeColorScaleConditionalFormatRuleProxy : ThreeColorScaleConditionalFormatRuleProxy
public double? Median
get { return this.MedianValue; }
set { this.MedianValue = value; }
public double? Maximum
get { return this.MaximumValue; }
set { this.MaximumValue = value; }
public double? Minimum
get { return this.MinimumValue; }
set { this.MinimumValue = value; }
protected override Style EvaluateCondition(object sourceDataObject, object sourceDataValue)
if (sourceDataValue == null)
return null;
Summary summary = sourceDataObject as Summary;
if (summary != null)
this.MaximumValue = summary.MaxWeight;
this.MinimumValue = summary.Minweight;
IQueryable q = summary.Students.AsQueryable();
SummaryContext sc = SummaryContext.CreateGenericSummary(typeof(Student), "Weight", LinqSummaryOperator.Average);
this.MedianValue = Convert.ToDouble(sc.Execute(q), CultureInfo.InvariantCulture);
this.GenerateLineEquations();
return base.EvaluateCondition(sourceDataObject, sourceDataValue);
3. Use this Rule instead of the in the box ThreColorScaleRule:
<infragistics:TextColumn Key="OurWeight" Width="*" IsSortable="True" IsSorted ="Ascending">
<infragistics:TextColumn.ConditionalFormatCollection>
<local:CustomThreeColorScaleConditionalFormatRule MaximumColor="Salmon" MedianColor="#FFD6C347" MinimumColor="#FF76D264" MaximumValue="{Binding RowData.MaxWeight}" MinimumValue="{Binding RowData.Minweight}"/>
</infragistics:TextColumn.ConditionalFormatCollection>
Hope this helps,
-SteveZ