DataGridTemplateColumn.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / DataGridTemplateColumn.cs / 1305600 / DataGridTemplateColumn.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.ComponentModel; 
using System.Diagnostics;
using System.Windows; 
using System.Windows.Data;

namespace System.Windows.Controls
{ 
    /// 
    ///     A column definition that allows a developer to specify specific 
    ///     editing and non-editing templates. 
    /// 
    public class DataGridTemplateColumn : DataGridColumn 
    {
        #region Constructors

        static DataGridTemplateColumn() 
        {
            CanUserSortProperty.OverrideMetadata( 
                typeof(DataGridTemplateColumn), 
                new FrameworkPropertyMetadata(null, new CoerceValueCallback(OnCoerceTemplateColumnCanUserSort)));
            SortMemberPathProperty.OverrideMetadata( 
                typeof(DataGridTemplateColumn),
                new FrameworkPropertyMetadata(new PropertyChangedCallback(OnTemplateColumnSortMemberPathChanged)));
        }
 
        #endregion
 
        #region Auto Sort 

        private static void OnTemplateColumnSortMemberPathChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
        {
            DataGridTemplateColumn column = (DataGridTemplateColumn)d;
            column.CoerceValue(CanUserSortProperty);
        } 

        private static object OnCoerceTemplateColumnCanUserSort(DependencyObject d, object baseValue) 
        { 
            DataGridTemplateColumn templateColumn = (DataGridTemplateColumn)d;
            if (string.IsNullOrEmpty(templateColumn.SortMemberPath)) 
            {
                return false;
            }
 
            return DataGridColumn.OnCoerceCanUserSort(d, baseValue);
        } 
 
        #endregion
 
        #region Templates

        /// 
        ///     A template describing how to display data for a cell in this column. 
        /// 
        public DataTemplate CellTemplate 
        { 
            get { return (DataTemplate)GetValue(CellTemplateProperty); }
            set { SetValue(CellTemplateProperty, value); } 
        }

        /// 
        ///     The DependencyProperty representing the CellTemplate property. 
        /// 
        public static readonly DependencyProperty CellTemplateProperty = DependencyProperty.Register( 
                                                                            "CellTemplate", 
                                                                            typeof(DataTemplate),
                                                                            typeof(DataGridTemplateColumn), 
                                                                            new FrameworkPropertyMetadata(null, new PropertyChangedCallback(DataGridColumn.NotifyPropertyChangeForRefreshContent)));

        /// 
        ///     A template selector describing how to display data for a cell in this column. 
        /// 
        public DataTemplateSelector CellTemplateSelector 
        { 
            get { return (DataTemplateSelector)GetValue(CellTemplateSelectorProperty); }
            set { SetValue(CellTemplateSelectorProperty, value); } 
        }

        /// 
        ///     The DependencyProperty representing the CellTemplateSelector property. 
        /// 
        public static readonly DependencyProperty CellTemplateSelectorProperty = DependencyProperty.Register( 
                                                                                    "CellTemplateSelector", 
                                                                                    typeof(DataTemplateSelector),
                                                                                    typeof(DataGridTemplateColumn), 
                                                                                    new FrameworkPropertyMetadata(null, new PropertyChangedCallback(DataGridColumn.NotifyPropertyChangeForRefreshContent)));

        /// 
        ///     A template describing how to display data for a cell 
        ///     that is being edited in this column.
        ///  
        public DataTemplate CellEditingTemplate 
        {
            get { return (DataTemplate)GetValue(CellEditingTemplateProperty); } 
            set { SetValue(CellEditingTemplateProperty, value); }
        }

        ///  
        ///     The DependencyProperty representing the CellEditingTemplate
        ///  
        public static readonly DependencyProperty CellEditingTemplateProperty = DependencyProperty.Register( 
                                                                                    "CellEditingTemplate",
                                                                                    typeof(DataTemplate), 
                                                                                    typeof(DataGridTemplateColumn),
                                                                                    new FrameworkPropertyMetadata(null, new PropertyChangedCallback(DataGridColumn.NotifyPropertyChangeForRefreshContent)));

        ///  
        ///     A template selector describing how to display data for a cell
        ///     that is being edited in this column. 
        ///  
        public DataTemplateSelector CellEditingTemplateSelector
        { 
            get { return (DataTemplateSelector)GetValue(CellEditingTemplateSelectorProperty); }
            set { SetValue(CellEditingTemplateSelectorProperty, value); }
        }
 
        /// 
        ///     The DependencyProperty representing the CellEditingTemplateSelector 
        ///  
        public static readonly DependencyProperty CellEditingTemplateSelectorProperty = DependencyProperty.Register(
                                                                                            "CellEditingTemplateSelector", 
                                                                                            typeof(DataTemplateSelector),
                                                                                            typeof(DataGridTemplateColumn),
                                                                                            new FrameworkPropertyMetadata(null, new PropertyChangedCallback(DataGridColumn.NotifyPropertyChangeForRefreshContent)));
 
        /// 
        ///     Returns either the specified CellTemplate or CellEditingTemplate. 
        ///     CellTemplate is returned if CellEditingTemplate is null. 
        /// 
        /// Whether the editing template is requested. 
        private DataTemplate ChooseCellTemplate(bool isEditing)
        {
            DataTemplate template = null;
 
            if (isEditing)
            { 
                template = CellEditingTemplate; 
            }
 
            if (template == null)
            {
                template = CellTemplate;
            } 

            return template; 
        } 

        ///  
        ///     Returns either the specified CellTemplateSelector or CellEditingTemplateSelector.
        ///     CellTemplateSelector is returned if CellEditingTemplateSelector is null.
        /// 
        /// Whether the editing template selector is requested. 
        private DataTemplateSelector ChooseCellTemplateSelector(bool isEditing)
        { 
            DataTemplateSelector templateSelector = null; 

            if (isEditing) 
            {
                templateSelector = CellEditingTemplateSelector;
            }
 
            if (templateSelector == null)
            { 
                templateSelector = CellTemplateSelector; 
            }
 
            return templateSelector;
        }

        #endregion 

        #region Visual Tree Generation 
 
        /// 
        ///     Creates the visual tree that will become the content of a cell. 
        /// 
        /// Whether the editing version is being requested.
        /// The data item for the cell.
        /// The cell container that will receive the tree. 
        private FrameworkElement LoadTemplateContent(bool isEditing, object dataItem, DataGridCell cell)
        { 
            DataTemplate template = ChooseCellTemplate(isEditing); 
            DataTemplateSelector templateSelector = ChooseCellTemplateSelector(isEditing);
            if (template != null || templateSelector != null) 
            {
                ContentPresenter contentPresenter = new ContentPresenter();
                BindingOperations.SetBinding(contentPresenter, ContentPresenter.ContentProperty, new Binding());
                contentPresenter.ContentTemplate = template; 
                contentPresenter.ContentTemplateSelector = templateSelector;
                return contentPresenter; 
            } 

            return null; 
        }

        /// 
        ///     Creates the visual tree that will become the content of a cell. 
        /// 
        protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem) 
        { 
            return LoadTemplateContent(/* isEditing = */ false, dataItem, cell);
        } 

        /// 
        ///     Creates the visual tree that will become the content of a cell.
        ///  
        protected override FrameworkElement GenerateEditingElement(DataGridCell cell, object dataItem)
        { 
            return LoadTemplateContent(/* isEditing = */ true, dataItem, cell); 
        }
 
        #endregion

        #region Property Changed Handler
 
        /// 
        /// Override which handles property 
        /// change for template properties 
        /// 
        ///  
        /// 
        protected internal override void RefreshCellContent(FrameworkElement element, string propertyName)
        {
            DataGridCell cell = element as DataGridCell; 
            if (cell != null)
            { 
                bool isCellEditing = cell.IsEditing; 

                if ((!isCellEditing && 
                        ((string.Compare(propertyName, "CellTemplate", StringComparison.Ordinal) == 0) ||
                        (string.Compare(propertyName, "CellTemplateSelector", StringComparison.Ordinal) == 0))) ||
                    (isCellEditing &&
                        ((string.Compare(propertyName, "CellEditingTemplate", StringComparison.Ordinal) == 0) || 
                        (string.Compare(propertyName, "CellEditingTemplateSelector", StringComparison.Ordinal) == 0))))
                { 
                    cell.BuildVisualTree(); 
                    return;
                } 
            }

            base.RefreshCellContent(element, propertyName);
        } 

        #endregion 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DataGridTemplateColumn.cs source code in C# .NET

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