DataGridHyperlinkColumn.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / DataGridHyperlinkColumn.cs / 1305600 / DataGridHyperlinkColumn.cs

                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Collections.Generic; 
using System.ComponentModel;
using System.Diagnostics; 
using System.Windows;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input; 
using System.Windows.Media;
 
namespace System.Windows.Controls 
{
    ///  
    ///     A column that displays a hyperlink.
    /// 
    public class DataGridHyperlinkColumn : DataGridBoundColumn
    { 
        static DataGridHyperlinkColumn()
        { 
            ElementStyleProperty.OverrideMetadata(typeof(DataGridHyperlinkColumn), new FrameworkPropertyMetadata(DefaultElementStyle)); 
            EditingElementStyleProperty.OverrideMetadata(typeof(DataGridHyperlinkColumn), new FrameworkPropertyMetadata(DefaultEditingElementStyle));
        } 

        #region Hyperlink Column Properties

        ///  
        /// Dependecy property for TargetName Property
        ///  
        public static readonly DependencyProperty TargetNameProperty = 
            Hyperlink.TargetNameProperty.AddOwner(
                typeof(DataGridHyperlinkColumn), 
                new FrameworkPropertyMetadata(null, new PropertyChangedCallback(DataGridColumn.NotifyPropertyChangeForRefreshContent)));

        /// 
        /// The property which determines the target name of the hyperlink 
        /// 
        public string TargetName 
        { 
            get { return (string)GetValue(TargetNameProperty); }
            set { SetValue(TargetNameProperty, value); } 
        }

        /// 
        /// The binding to the content to be display under hyperlink 
        /// 
        public BindingBase ContentBinding 
        { 
            get
            { 
                return _contentBinding;
            }

            set 
            {
                if (_contentBinding != value) 
                { 
                    BindingBase oldValue = _contentBinding;
                    _contentBinding = value; 
                    OnContentBindingChanged(oldValue, value);
                }
            }
        } 

        ///  
        ///     Called when ContentBinding changes. 
        /// 
        ///  
        ///     Default implementation notifies the DataGrid and its subtree about the change.
        /// 
        /// The old binding.
        /// The new binding. 
        protected virtual void OnContentBindingChanged(BindingBase oldBinding, BindingBase newBinding)
        { 
            NotifyPropertyChanged("ContentBinding"); 
        }
 
        /// 
        /// Try applying ContentBinding. If it doesnt work out apply Binding.
        /// 
        ///  
        /// 
        private void ApplyContentBinding(DependencyObject target, DependencyProperty property) 
        { 
            if (ContentBinding != null)
            { 
                BindingOperations.SetBinding(target, property, ContentBinding);
            }
            else if (Binding != null)
            { 
                BindingOperations.SetBinding(target, property, Binding);
            } 
            else 
            {
                BindingOperations.ClearBinding(target, property); 
            }
        }

        #endregion 

        #region Property Changed Handler 
 
        /// 
        /// Override which rebuilds the cell's visual tree for ContentBinding change 
        /// and Modifies Hyperlink for TargetName change
        /// 
        /// 
        ///  
        protected internal override void RefreshCellContent(FrameworkElement element, string propertyName)
        { 
            DataGridCell cell = element as DataGridCell; 
            if (cell != null && !cell.IsEditing)
            { 
                if (string.Compare(propertyName, "ContentBinding", StringComparison.Ordinal) == 0)
                {
                    cell.BuildVisualTree();
                } 
                else if (string.Compare(propertyName, "TargetName", StringComparison.Ordinal) == 0)
                { 
                    TextBlock outerBlock = cell.Content as TextBlock; 
                    if (outerBlock != null && outerBlock.Inlines.Count > 0)
                    { 
                        Hyperlink link = outerBlock.Inlines.FirstInline as Hyperlink;
                        if (link != null)
                        {
                            link.TargetName = TargetName; 
                        }
                    } 
                } 
            }
            else 
            {
                base.RefreshCellContent(element, propertyName);
            }
        } 

        #endregion 
 
        #region Styles
 
        /// 
        ///     The default value of the ElementStyle property.
        ///     This value can be used as the BasedOn for new styles.
        ///  
        public static Style DefaultElementStyle
        { 
            get { return DataGridTextColumn.DefaultElementStyle; } 
        }
 
        /// 
        ///     The default value of the EditingElementStyle property.
        ///     This value can be used as the BasedOn for new styles.
        ///  
        public static Style DefaultEditingElementStyle
        { 
            get { return DataGridTextColumn.DefaultEditingElementStyle; } 
        }
 
        #endregion

        #region Element Generation
 
        /// 
        ///     Creates the visual tree for cells. 
        ///  
        protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
        { 
            TextBlock outerBlock = new TextBlock();
            Hyperlink link = new Hyperlink();
            InlineUIContainer inlineContainer = new InlineUIContainer();
            ContentPresenter innerContentPresenter = new ContentPresenter(); 

            outerBlock.Inlines.Add(link); 
            link.Inlines.Add(inlineContainer); 
            inlineContainer.Child = innerContentPresenter;
 
            link.TargetName = TargetName;

            ApplyStyle(/* isEditing = */ false, /* defaultToElementStyle = */ false, outerBlock);
            ApplyBinding(link, Hyperlink.NavigateUriProperty); 
            ApplyContentBinding(innerContentPresenter, ContentPresenter.ContentProperty);
 
            return outerBlock; 
        }
 
        /// 
        ///     Creates the visual tree for cells.
        /// 
        protected override FrameworkElement GenerateEditingElement(DataGridCell cell, object dataItem) 
        {
            TextBox textBox = new TextBox(); 
 
            ApplyStyle(/* isEditing = */ true, /* defaultToElementStyle = */ false, textBox);
            ApplyBinding(textBox, TextBox.TextProperty); 

            return textBox;
        }
 
        #endregion
 
        #region Editing 

        ///  
        ///     Called when a cell has just switched to edit mode.
        /// 
        /// A reference to element returned by GenerateEditingElement.
        /// The event args of the input event that caused the cell to go into edit mode. May be null. 
        /// The unedited value of the cell.
        protected override object PrepareCellForEdit(FrameworkElement editingElement, RoutedEventArgs editingEventArgs) 
        { 
            TextBox textBox = editingElement as TextBox;
            if (textBox != null) 
            {
                textBox.Focus();

                string originalValue = textBox.Text; 

                TextCompositionEventArgs textArgs = editingEventArgs as TextCompositionEventArgs; 
                if (textArgs != null) 
                {
                    // If text input started the edit, then replace the text with what was typed. 
                    string inputText = textArgs.Text;
                    textBox.Text = inputText;

                    // Place the caret after the end of the text. 
                    textBox.Select(inputText.Length, 0);
                } 
                else 
                {
                    // If something else started the edit, then select the text 
                    textBox.SelectAll();
                }

                return originalValue; 
            }
 
            return null; 
        }
 
        internal override void OnInput(InputEventArgs e)
        {
            // Text input will start an edit.
            // Escape is meant to be for CancelEdit. But DataGrid 
            // may not handle KeyDown event for Escape if nothing
            // is cancelable. Such KeyDown if unhandled by others 
            // will ultimately get promoted to TextInput and be handled 
            // here. But BeginEdit on escape could be confusing to the user.
            // Hence escape key is special case and BeginEdit is performed if 
            // there is atleast one non espace key character.
            if (DataGridHelper.HasNonEscapeCharacters(e as TextCompositionEventArgs))
            {
                BeginEdit(e); 
            }
        } 
 
        #endregion
 
        #region Data

        private BindingBase _contentBinding = null;
 
        #endregion
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Collections.Generic; 
using System.ComponentModel;
using System.Diagnostics; 
using System.Windows;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input; 
using System.Windows.Media;
 
namespace System.Windows.Controls 
{
    ///  
    ///     A column that displays a hyperlink.
    /// 
    public class DataGridHyperlinkColumn : DataGridBoundColumn
    { 
        static DataGridHyperlinkColumn()
        { 
            ElementStyleProperty.OverrideMetadata(typeof(DataGridHyperlinkColumn), new FrameworkPropertyMetadata(DefaultElementStyle)); 
            EditingElementStyleProperty.OverrideMetadata(typeof(DataGridHyperlinkColumn), new FrameworkPropertyMetadata(DefaultEditingElementStyle));
        } 

        #region Hyperlink Column Properties

        ///  
        /// Dependecy property for TargetName Property
        ///  
        public static readonly DependencyProperty TargetNameProperty = 
            Hyperlink.TargetNameProperty.AddOwner(
                typeof(DataGridHyperlinkColumn), 
                new FrameworkPropertyMetadata(null, new PropertyChangedCallback(DataGridColumn.NotifyPropertyChangeForRefreshContent)));

        /// 
        /// The property which determines the target name of the hyperlink 
        /// 
        public string TargetName 
        { 
            get { return (string)GetValue(TargetNameProperty); }
            set { SetValue(TargetNameProperty, value); } 
        }

        /// 
        /// The binding to the content to be display under hyperlink 
        /// 
        public BindingBase ContentBinding 
        { 
            get
            { 
                return _contentBinding;
            }

            set 
            {
                if (_contentBinding != value) 
                { 
                    BindingBase oldValue = _contentBinding;
                    _contentBinding = value; 
                    OnContentBindingChanged(oldValue, value);
                }
            }
        } 

        ///  
        ///     Called when ContentBinding changes. 
        /// 
        ///  
        ///     Default implementation notifies the DataGrid and its subtree about the change.
        /// 
        /// The old binding.
        /// The new binding. 
        protected virtual void OnContentBindingChanged(BindingBase oldBinding, BindingBase newBinding)
        { 
            NotifyPropertyChanged("ContentBinding"); 
        }
 
        /// 
        /// Try applying ContentBinding. If it doesnt work out apply Binding.
        /// 
        ///  
        /// 
        private void ApplyContentBinding(DependencyObject target, DependencyProperty property) 
        { 
            if (ContentBinding != null)
            { 
                BindingOperations.SetBinding(target, property, ContentBinding);
            }
            else if (Binding != null)
            { 
                BindingOperations.SetBinding(target, property, Binding);
            } 
            else 
            {
                BindingOperations.ClearBinding(target, property); 
            }
        }

        #endregion 

        #region Property Changed Handler 
 
        /// 
        /// Override which rebuilds the cell's visual tree for ContentBinding change 
        /// and Modifies Hyperlink for TargetName change
        /// 
        /// 
        ///  
        protected internal override void RefreshCellContent(FrameworkElement element, string propertyName)
        { 
            DataGridCell cell = element as DataGridCell; 
            if (cell != null && !cell.IsEditing)
            { 
                if (string.Compare(propertyName, "ContentBinding", StringComparison.Ordinal) == 0)
                {
                    cell.BuildVisualTree();
                } 
                else if (string.Compare(propertyName, "TargetName", StringComparison.Ordinal) == 0)
                { 
                    TextBlock outerBlock = cell.Content as TextBlock; 
                    if (outerBlock != null && outerBlock.Inlines.Count > 0)
                    { 
                        Hyperlink link = outerBlock.Inlines.FirstInline as Hyperlink;
                        if (link != null)
                        {
                            link.TargetName = TargetName; 
                        }
                    } 
                } 
            }
            else 
            {
                base.RefreshCellContent(element, propertyName);
            }
        } 

        #endregion 
 
        #region Styles
 
        /// 
        ///     The default value of the ElementStyle property.
        ///     This value can be used as the BasedOn for new styles.
        ///  
        public static Style DefaultElementStyle
        { 
            get { return DataGridTextColumn.DefaultElementStyle; } 
        }
 
        /// 
        ///     The default value of the EditingElementStyle property.
        ///     This value can be used as the BasedOn for new styles.
        ///  
        public static Style DefaultEditingElementStyle
        { 
            get { return DataGridTextColumn.DefaultEditingElementStyle; } 
        }
 
        #endregion

        #region Element Generation
 
        /// 
        ///     Creates the visual tree for cells. 
        ///  
        protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
        { 
            TextBlock outerBlock = new TextBlock();
            Hyperlink link = new Hyperlink();
            InlineUIContainer inlineContainer = new InlineUIContainer();
            ContentPresenter innerContentPresenter = new ContentPresenter(); 

            outerBlock.Inlines.Add(link); 
            link.Inlines.Add(inlineContainer); 
            inlineContainer.Child = innerContentPresenter;
 
            link.TargetName = TargetName;

            ApplyStyle(/* isEditing = */ false, /* defaultToElementStyle = */ false, outerBlock);
            ApplyBinding(link, Hyperlink.NavigateUriProperty); 
            ApplyContentBinding(innerContentPresenter, ContentPresenter.ContentProperty);
 
            return outerBlock; 
        }
 
        /// 
        ///     Creates the visual tree for cells.
        /// 
        protected override FrameworkElement GenerateEditingElement(DataGridCell cell, object dataItem) 
        {
            TextBox textBox = new TextBox(); 
 
            ApplyStyle(/* isEditing = */ true, /* defaultToElementStyle = */ false, textBox);
            ApplyBinding(textBox, TextBox.TextProperty); 

            return textBox;
        }
 
        #endregion
 
        #region Editing 

        ///  
        ///     Called when a cell has just switched to edit mode.
        /// 
        /// A reference to element returned by GenerateEditingElement.
        /// The event args of the input event that caused the cell to go into edit mode. May be null. 
        /// The unedited value of the cell.
        protected override object PrepareCellForEdit(FrameworkElement editingElement, RoutedEventArgs editingEventArgs) 
        { 
            TextBox textBox = editingElement as TextBox;
            if (textBox != null) 
            {
                textBox.Focus();

                string originalValue = textBox.Text; 

                TextCompositionEventArgs textArgs = editingEventArgs as TextCompositionEventArgs; 
                if (textArgs != null) 
                {
                    // If text input started the edit, then replace the text with what was typed. 
                    string inputText = textArgs.Text;
                    textBox.Text = inputText;

                    // Place the caret after the end of the text. 
                    textBox.Select(inputText.Length, 0);
                } 
                else 
                {
                    // If something else started the edit, then select the text 
                    textBox.SelectAll();
                }

                return originalValue; 
            }
 
            return null; 
        }
 
        internal override void OnInput(InputEventArgs e)
        {
            // Text input will start an edit.
            // Escape is meant to be for CancelEdit. But DataGrid 
            // may not handle KeyDown event for Escape if nothing
            // is cancelable. Such KeyDown if unhandled by others 
            // will ultimately get promoted to TextInput and be handled 
            // here. But BeginEdit on escape could be confusing to the user.
            // Hence escape key is special case and BeginEdit is performed if 
            // there is atleast one non espace key character.
            if (DataGridHelper.HasNonEscapeCharacters(e as TextCompositionEventArgs))
            {
                BeginEdit(e); 
            }
        } 
 
        #endregion
 
        #region Data

        private BindingBase _contentBinding = null;
 
        #endregion
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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