How to: Apply an Icon Set Format to a Column

Nov 13, 2018
4 minutes to read

This example illustrates how to apply an icon set format to the Satisfaction column in a GridControl at design time using the Grid Designer and in code.

An icon set format allows you to classify column cell values into several ranges, assign an icon to each range, and display a specific icon in a cell according to the cell value. In this example, a predefined icon set is used to display empty, half-filled and filled star icons for small (from 0% to 33%), middle (from 33% to 67%) and large (more than 67%) values, respectively.

To create a new formatting rule at design time, invoke the Format Rule Collection Editor from the Grid Designer. It can also be accessed from the Properties grid by clicking the ellipsis button for the ColumnView.FormatRules property.

Invoke the Grid Designer and switch to the Style Format Rules page (in the Appearance category).
Click the Add button to create a new format rule (format rules in a GridControl are encapsulated by GridFormatRule objects).
Select the Format using icons rule type. The format rule’s FormatRuleBase.Rule property will be set to a new FormatConditionRuleIconSet object.
Set the GridFormatRule.Column property to the Satisfaction column. This column provides values to test against the formatting rule.
Choose one of the predefined icon sets using the FormatConditionRuleIconSet.IconSet property. You can do this in the Properties tab or the Rule tab. The Rule tab allows you to see a preview of the selected icon set. In this example, the Ratings: Stars3 icon set is selected.
Run the application. The image below illustrates the result.

The following code is equivalent to the design-time actions shown above.

C#
VB.NET

csharp

using DevExpress.XtraGrid;
using DevExpress.XtraEditors;

GridFormatRule gridFormatRule = new GridFormatRule();
FormatConditionRuleIconSet formatConditionRuleIconSet = new FormatConditionRuleIconSet();
FormatConditionIconSet iconSet = formatConditionRuleIconSet.IconSet = new FormatConditionIconSet();
FormatConditionIconSetIcon icon1 = new FormatConditionIconSetIcon();
FormatConditionIconSetIcon icon2 = new FormatConditionIconSetIcon();
FormatConditionIconSetIcon icon3 = new FormatConditionIconSetIcon();

//Choose predefined icons.
icon1.PredefinedName = "Stars3_1.png";
icon2.PredefinedName = "Stars3_2.png";
icon3.PredefinedName = "Stars3_3.png";

//Specify the type of threshold values.
iconSet.ValueType = FormatConditionValueType.Percent;

//Define ranges to which icons are applied by setting threshold values.
icon1.Value = 67; // target range: 67% <= value
icon1.ValueComparison = FormatConditionComparisonType.GreaterOrEqual;
icon2.Value = 33; // target range: 33% <= value < 67%
icon2.ValueComparison = FormatConditionComparisonType.GreaterOrEqual;
icon3.Value = 0; // target range: 0% <= value < 33%
icon3.ValueComparison = FormatConditionComparisonType.GreaterOrEqual;

//Add icons to the icon set.
iconSet.Icons.Add(icon1);
iconSet.Icons.Add(icon2);
iconSet.Icons.Add(icon3);

//Specify the rule type.
gridFormatRule.Rule = formatConditionRuleIconSet;
//Specify the column to which formatting is applied.
gridFormatRule.Column = colCustomersSatisfaction;
//Add the formatting rule to the GridView.
gridView1.FormatRules.Add(gridFormatRule);

Imports DevExpress.XtraEditors
Imports DevExpress.XtraGrid

Dim gridFormatRule As New GridFormatRule()
Dim formatConditionRuleIconSet As New FormatConditionRuleIconSet()
formatConditionRuleIconSet.IconSet = New FormatConditionIconSet()
Dim iconSet As FormatConditionIconSet = formatConditionRuleIconSet.IconSet
Dim icon1 As New FormatConditionIconSetIcon()
Dim icon2 As New FormatConditionIconSetIcon()
Dim icon3 As New FormatConditionIconSetIcon()

'Choose predefined icons.
icon1.PredefinedName = "Stars3_1.png"
icon2.PredefinedName = "Stars3_2.png"
icon3.PredefinedName = "Stars3_3.png"

'Specify the type of threshold values.
iconSet.ValueType = FormatConditionValueType.Percent

'Define ranges to which icons are applied by setting threshold values.
icon1.Value = 67 ' target range: 67% <= value
icon1.ValueComparison = FormatConditionComparisonType.GreaterOrEqual
icon2.Value = 33 ' target range: 33% <= value < 67%
icon2.ValueComparison = FormatConditionComparisonType.GreaterOrEqual
icon3.Value = 0 ' target range: 0% <= value < 33%
icon3.ValueComparison = FormatConditionComparisonType.GreaterOrEqual

'Add icons to the icon set.
iconSet.Icons.Add(icon1)
iconSet.Icons.Add(icon2)
iconSet.Icons.Add(icon3)

'Specify the rule type.
gridFormatRule.Rule = formatConditionRuleIconSet
'Specify the column to which formatting is applied.
gridFormatRule.Column = colCustomersSatisfaction
'Add the formatting rule to the GridView.
gridView1.FormatRules.Add(gridFormatRule)