Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / DataGridBoundColumn.cs / 1305600 / DataGridBoundColumn.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Collections.ObjectModel; using System.ComponentModel; using System.Diagnostics; using System.Windows; using System.Windows.Data; using System.Windows.Input; namespace System.Windows.Controls { ////// A base class for specifying column definitions for certain standard /// types that do not allow arbitrary templates. /// public abstract class DataGridBoundColumn : DataGridColumn { #region Constructors static DataGridBoundColumn() { SortMemberPathProperty.OverrideMetadata(typeof(DataGridBoundColumn), new FrameworkPropertyMetadata(null, OnCoerceSortMemberPath)); } #endregion #region Binding private static object OnCoerceSortMemberPath(DependencyObject d, object baseValue) { var column = (DataGridBoundColumn)d; var sortMemberPath = (string)baseValue; if (string.IsNullOrEmpty(sortMemberPath)) { var bindingSortMemberPath = DataGridHelper.GetPathFromBinding(column.Binding as Binding); if (!string.IsNullOrEmpty(bindingSortMemberPath)) { sortMemberPath = bindingSortMemberPath; } } return sortMemberPath; } ////// The binding that will be applied to the generated element. /// ////// This isn't a DP because if it were getting the value would evaluate the binding. /// public virtual BindingBase Binding { get { return _binding; } set { if (_binding != value) { BindingBase oldBinding = _binding; _binding = value; CoerceValue(IsReadOnlyProperty); CoerceValue(SortMemberPathProperty); OnBindingChanged(oldBinding, _binding); } } } protected override bool OnCoerceIsReadOnly(bool baseValue) { if (DataGridHelper.IsOneWay(_binding)) { return true; } // only call the base if we dont want to force IsReadOnly true return base.OnCoerceIsReadOnly(baseValue); } ////// Called when Binding changes. /// ////// Default implementation notifies the DataGrid and its subtree about the change. /// /// The old binding. /// The new binding. protected virtual void OnBindingChanged(BindingBase oldBinding, BindingBase newBinding) { NotifyPropertyChanged("Binding"); } ////// Assigns the Binding to the desired property on the target object. /// internal void ApplyBinding(DependencyObject target, DependencyProperty property) { BindingBase binding = Binding; if (binding != null) { BindingOperations.SetBinding(target, property, binding); } else { BindingOperations.ClearBinding(target, property); } } #endregion #region Styling ////// A style that is applied to the generated element when not editing. /// The TargetType of the style depends on the derived column class. /// public Style ElementStyle { get { return (Style)GetValue(ElementStyleProperty); } set { SetValue(ElementStyleProperty, value); } } ////// The DependencyProperty for the ElementStyle property. /// public static readonly DependencyProperty ElementStyleProperty = DependencyProperty.Register( "ElementStyle", typeof(Style), typeof(DataGridBoundColumn), new FrameworkPropertyMetadata(null, new PropertyChangedCallback(DataGridColumn.NotifyPropertyChangeForRefreshContent))); ////// A style that is applied to the generated element when editing. /// The TargetType of the style depends on the derived column class. /// public Style EditingElementStyle { get { return (Style)GetValue(EditingElementStyleProperty); } set { SetValue(EditingElementStyleProperty, value); } } ////// The DependencyProperty for the EditingElementStyle property. /// public static readonly DependencyProperty EditingElementStyleProperty = DependencyProperty.Register( "EditingElementStyle", typeof(Style), typeof(DataGridBoundColumn), new FrameworkPropertyMetadata(null, new PropertyChangedCallback(DataGridColumn.NotifyPropertyChangeForRefreshContent))); ////// Assigns the ElementStyle to the desired property on the given element. /// internal void ApplyStyle(bool isEditing, bool defaultToElementStyle, FrameworkElement element) { Style style = PickStyle(isEditing, defaultToElementStyle); if (style != null) { element.Style = style; } } private Style PickStyle(bool isEditing, bool defaultToElementStyle) { Style style = isEditing ? EditingElementStyle : ElementStyle; if (isEditing && defaultToElementStyle && (style == null)) { style = ElementStyle; } return style; } #endregion #region Clipboard Copy/Paste ////// If base ClipboardContentBinding is not set we use Binding. /// public override BindingBase ClipboardContentBinding { get { return base.ClipboardContentBinding ?? Binding; } set { base.ClipboardContentBinding = value; } } #endregion #region Property Changed Handler ////// Override which rebuilds the cell's visual tree for Binding change /// /// /// protected internal override void RefreshCellContent(FrameworkElement element, string propertyName) { DataGridCell cell = element as DataGridCell; if (cell != null) { bool isCellEditing = cell.IsEditing; if ((string.Compare(propertyName, "Binding", StringComparison.Ordinal) == 0) || (string.Compare(propertyName, "ElementStyle", StringComparison.Ordinal) == 0 && !isCellEditing) || (string.Compare(propertyName, "EditingElementStyle", StringComparison.Ordinal) == 0 && isCellEditing)) { cell.BuildVisualTree(); return; } } base.RefreshCellContent(element, propertyName); } #endregion #region Data private BindingBase _binding; #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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