init

Common/DTS.Common/.svn/pristine/b3/b35c52a7f40cfc6e818d907834a09eb339d6de97.svn-base

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+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Controls;
+using System.Windows.Data;
+
+namespace DTS.Common.Controls
+{
+    public class AutoSizedGridView : GridView
+    {
+        HashSet<int> _allColumns;
+        HashSet<int> _autoWidthColumns;
+        Dictionary<int, BindingExpression> _widthBoundColumns;
+
+        protected override void PrepareItem(ListViewItem item)
+        {
+            if (null == _allColumns || !Columns.Select(col => col.GetHashCode()).SequenceEqual(_allColumns))
+            {
+                _allColumns = new HashSet<int>();
+                _autoWidthColumns = new HashSet<int>();
+                _widthBoundColumns = new Dictionary<int, BindingExpression>();
+
+                foreach (var column in Columns)
+                {
+                    _allColumns.Add(column.GetHashCode());
+                    if (double.IsNaN(column.Width) && //Width == "Auto"
+                        null == BindingOperations.GetBindingExpression(column, GridViewColumn.WidthProperty)) //Width isn't bound
+                    {
+                        _autoWidthColumns.Add(column.GetHashCode());
+                    }
+                    else if (null != BindingOperations.GetBindingExpression(column, GridViewColumn.WidthProperty))
+                    {
+                        _widthBoundColumns.Add(column.GetHashCode(), BindingOperations.GetBindingExpression(column, GridViewColumn.WidthProperty));
+                    }
+                }
+            }
+
+            foreach (var column in Columns)
+            {
+                if (_autoWidthColumns.Contains(column.GetHashCode()))
+                {
+                    //force remeasure
+                    if (double.IsNaN(column.Width))
+                    {
+                        column.Width = column.ActualWidth;
+                    }
+                    column.Width = double.NaN;
+                }
+                else if (_widthBoundColumns.ContainsKey(column.GetHashCode()))
+                {
+                    //check if binding lost, re-bind
+                    if (null == BindingOperations.GetBindingExpression(column, GridViewColumn.WidthProperty))
+                    {
+                        BindingOperations.SetBinding(column, GridViewColumn.WidthProperty, _widthBoundColumns[column.GetHashCode()].ParentBindingBase);
+                    }
+                }
+            }
+
+            base.PrepareItem(item);
+        }
+    }
+}