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How to: Apply Conditional Formatting to Grid Cells using the Gradient Ranges Format Condition

  • 2 min to read

The Range Gradient condition (FormatConditionRangeGradient) allows you to use predefined color gradients to apply conditional formatting to different ranges of values.

This example demonstrates how to apply conditional formatting to Grid cells using the predefined Red-Blue color gradient. Click the Update Formatting button to change start/end colors and the number of ranges in the color gradient. The third color in the middle of the color scale is also specified to generate a 3-color gradient.

Note

A complete sample project is available at How to Apply the Range Gradient Conditional Formatting to Grid Cells.

using DevExpress.DashboardCommon;
using DevExpress.DashboardWin;
using System.Drawing;

namespace Grid_GradientRangeCondition {
    public partial class Form1 : DevExpress.XtraEditors.XtraForm {
        public Form1() {
            InitializeComponent();
            dashboardViewer1.CustomizeDashboardTitle += DashboardViewer1_CustomizeDashboardTitle;
            Dashboard dashboard = new Dashboard();
            dashboard.LoadFromXml(@"..\..\Data\Dashboard.xml");
            dashboardViewer1.Dashboard = dashboard;
            GridDashboardItem grid = (GridDashboardItem)dashboard.Items["gridDashboardItem1"];
            GridMeasureColumn extendedPrice = (GridMeasureColumn)grid.Columns[1];

            GridItemFormatRule rangeRule = new GridItemFormatRule(extendedPrice);
            FormatConditionRangeGradient rangeCondition = 
                new FormatConditionRangeGradient(FormatConditionRangeGradientPredefinedType.RedBlue);
            rangeRule.Condition = rangeCondition;

            grid.FormatRules.AddRange(rangeRule);
        }

        private void DashboardViewer1_CustomizeDashboardTitle(object sender, CustomizeDashboardTitleEventArgs e)
        {
            DashboardToolbarItem itemUpdate = new DashboardToolbarItem(
                (args) => UpdateFormatting())
            {
                Caption = "Update Formatting",
            };
            e.Items.Add(itemUpdate);
        }

        private void UpdateFormatting() {
            GridDashboardItem grid = (GridDashboardItem)dashboardViewer1.Dashboard.Items[0];
            GridItemFormatRule rangeRule = grid.FormatRules[0];

            FormatConditionRangeGradient rangeCondition = 
                (FormatConditionRangeGradient)rangeRule.Condition;
            rangeCondition.Generate(new AppearanceSettings(Color.PaleVioletRed), 
                                    new AppearanceSettings(Color.PaleGreen), 9);
            RangeInfo middleRange = rangeCondition.RangeSet[4];
            middleRange.StyleSettings = new AppearanceSettings(Color.SkyBlue);

            rangeRule.Condition = rangeCondition;
        }
    }
}
See Also