Interface IGridTableCellStyleCache

Implement this interface for elements and keep a cache with style information for individual cells if you want reduce the number of QueryCellStyleInfo calls being raised for cells of this element.

Namespace: Syncfusion.Windows.Forms.Grid.Grouping

Assembly: Syncfusion.Grid.Grouping.Windows.dll

Syntax

public interface IGridTableCellStyleCache

Remarks

Here is example code to implement this interface. It is important to keep a version value and compare the version with GridEngine.Version. This ensures that when changes are made to the engine or table that the cache is reset:

    public class GridRecordRowWithCache : GridRecordRow, IGridTableCellAppearanceSource, IGridTableCellStyleCache
    {
        public GridRecordRowWithCache(RecordRowsPart parent)
            : base(parent)
        {
        }

        protected override void Dispose(bool disposing)
        {
            styles = null;
            base.Dispose (disposing);
        }

        #region IGridTableCellStyleCache Members
        ArrayList styles;
        int version;

        public ArrayList Styles
        {
            get
            {
                if (styles == null || this.version != Engine.Version)
                {
                    this.version = Engine.Version;
                    styles = new ArrayList();
                }
                return styles;
            }
        }

        public GridTableCellStyleInfo GetStyleAtColumn(int colIndex)
        {
            if (Styles != null && styles.Count > colIndex)
            {
                return styles[colIndex] as GridTableCellStyleInfo;
            }

            return null;
        }

        public void SetStyleAtColumn(int colIndex, GridTableCellStyleInfo style)
        {
            if (version != Engine.Version)
                ResetStyles();

            if (Styles.Count <= colIndex)
                Styles.AddRange(new object[colIndex-Styles.Count+1]);

            styles[colIndex] = style;
        }
        public void ResetStyles()
        {
            styles = null;
        }

        #endregion
    }

Methods

GetStyleAtColumn(Int32)

Returns the style for the specified column index.

Declaration

GridTableCellStyleInfo GetStyleAtColumn(int colIndex)

Parameters

Type	Name	Description
System.Int32	colIndex	The column index.

Returns

Type	Description
GridTableCellStyleInfo	The style object.

ResetStyles()

Empties the cache.

Declaration

void ResetStyles()

SetStyleAtColumn(Int32, GridTableCellStyleInfo)

Saves the style at the specified column index.

Declaration

void SetStyleAtColumn(int colIndex, GridTableCellStyleInfo style)

Parameters

Type	Name	Description
System.Int32	colIndex	The column index.
GridTableCellStyleInfo	style	The style object.