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FixedDataGrid.cs

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Toto je zdrojový kód souboru FixedDataGrid.cs

Fixing Silverlight DataGrid Row Auto-Resize only grows row height but won't shrink issue in DataGrid control.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;

namespace SilverlightApplication
{
    /// <summary>
    /// Fixed DataGrid control
    /// </summary>
    /// <remarks>
    /// Fixing issue: DataGrid Row Auto-Resize only grows row height but won't shrink
    /// </remarks>
    public class FixedDataGrid : DataGrid
    {
        /// <summary>
        /// Overrides OnLoadingRow
        /// </summary>
        protected override void OnLoadingRow(DataGridRowEventArgs e)
        {
            if (double.IsNaN(this.RowHeight))
            {
                e.Row.Loaded += Row_Loaded;
            }

            base.OnLoadingRow(e);
        }

        private void Row_Loaded(object sender, RoutedEventArgs e)
        {
            var row = (DataGridRow)sender;
            row.Loaded -= Row_Loaded;

            for (int col = 0; col < this.Columns.Count; col++)
            {
                var cellElement = this.Columns[col].GetCellContent(row);
                if (cellElement != null)
                {
                    cellElement.SizeChanged += CellElement_SizeChanged;
                }
            }            
        }

        private static void CellElement_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            //Fix issue: DataGrid Row Auto-Resize only grows row height but won't shrink
            var dataGrid = GetParentOf<DataGrid>((FrameworkElement)sender);
            if (dataGrid != null && double.IsNaN(dataGrid.RowHeight))
            {
                var row = DataGridRow.GetRowContainingElement((FrameworkElement)sender);

                //Fore recalculating row height
                try
                {
                    dataGrid.RowHeight = 0;
                    row.InvalidateMeasure();
                    row.Measure(row.RenderSize);
                }
                finally
                {
                    //Restore RowHeight
                    dataGrid.RowHeight = double.NaN;
                }
            }
        }

        private static T GetParentOf<T>(FrameworkElement element) where T : FrameworkElement
        {
            while (element != null)
            {
                T item = element as T;
                if (item != null)
                {
                    return item;
                }

                element = (FrameworkElement)VisualTreeHelper.GetParent(element);
            }

            return null;
        }
    }
}