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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / HeaderedItemsControl.cs / 1 / HeaderedItemsControl.cs
using System; using System.Collections; using System.ComponentModel; using System.Windows.Threading; using System.Windows.Data; using System.Windows.Media; using MS.Utility; using MS.Internal; using MS.Internal.Controls; using MS.Internal.KnownBoxes; using MS.Internal.Data; using MS.Internal.PresentationFramework; namespace System.Windows.Controls { ////// The base class for all controls that contain multiple items and have a header. /// ////// HeaderedItemsControl adds Header, HeaderTemplate, and Part features to an ItemsControl. /// [DefaultProperty("Header")] [Localizability(LocalizationCategory.Menu)] public class HeaderedItemsControl : ItemsControl { #region Constructors ////// Default HeaderedItemsControl constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public HeaderedItemsControl() : base() { } #endregion #region Properties ////// The DependencyProperty for the Header property. /// Flags: None /// Default Value: null /// [CommonDependencyProperty] public static readonly DependencyProperty HeaderProperty = HeaderedContentControl.HeaderProperty.AddOwner( typeof(HeaderedItemsControl), new FrameworkPropertyMetadata( (object) null, new PropertyChangedCallback(OnHeaderChanged))); ////// Header is the data used to for the header of each item in the control. /// [Bindable(true), CustomCategory("Content")] public object Header { get { return GetValue(HeaderProperty); } set { SetValue(HeaderProperty, value); } } ////// Called when HeaderProperty is invalidated on "d." /// private static void OnHeaderChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { HeaderedItemsControl ctrl = (HeaderedItemsControl) d; ctrl.SetValue(HasHeaderPropertyKey, (e.NewValue != null) ? BooleanBoxes.TrueBox : BooleanBoxes.FalseBox); ctrl.OnHeaderChanged(e.OldValue, e.NewValue); } ////// This method is invoked when the Header property changes. /// /// The old value of the Header property. /// The new value of the Header property. protected virtual void OnHeaderChanged(object oldHeader, object newHeader) { // if Header should not be treated as a logical child, there's // nothing to do if (!IsHeaderLogical()) return; RemoveLogicalChild(oldHeader); AddLogicalChild(newHeader); } ////// The key needed set a read-only property. /// private static readonly DependencyPropertyKey HasHeaderPropertyKey = HeaderedContentControl.HasHeaderPropertyKey; ////// The DependencyProperty for the HasHeader property. /// Flags: None /// Other: Read-Only /// Default Value: false /// [CommonDependencyProperty] public static readonly DependencyProperty HasHeaderProperty = HeaderedContentControl.HasHeaderProperty.AddOwner(typeof(HeaderedItemsControl)); ////// True if Header is non-null, false otherwise. /// [Bindable(false), Browsable(false)] public bool HasHeader { get { return (bool) GetValue(HasHeaderProperty); } } ////// The DependencyProperty for the HeaderTemplate property. /// Flags: Can be used in style rules /// Default Value: null /// [CommonDependencyProperty] public static readonly DependencyProperty HeaderTemplateProperty = HeaderedContentControl.HeaderTemplateProperty.AddOwner( typeof(HeaderedItemsControl), new FrameworkPropertyMetadata( (DataTemplate) null, new PropertyChangedCallback(OnHeaderTemplateChanged))); ////// HeaderTemplate is the template used to display the header of each item. /// [Bindable(true), CustomCategory("Content")] public DataTemplate HeaderTemplate { get { return (DataTemplate) GetValue(HeaderTemplateProperty); } set { SetValue(HeaderTemplateProperty, value); } } ////// Called when HeaderTemplateProperty is invalidated on "d." /// private static void OnHeaderTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { HeaderedItemsControl ctrl = (HeaderedItemsControl) d; ctrl.OnHeaderTemplateChanged((DataTemplate) e.OldValue, (DataTemplate) e.NewValue); } ////// This method is invoked when the HeaderTemplate property changes. /// /// The old value of the HeaderTemplate property. /// The new value of the HeaderTemplate property. protected virtual void OnHeaderTemplateChanged(DataTemplate oldHeaderTemplate, DataTemplate newHeaderTemplate) { Helper.CheckTemplateAndTemplateSelector("Header", HeaderTemplateProperty, HeaderTemplateSelectorProperty, this); } ////// The DependencyProperty for the HeaderTemplateSelector property. /// Flags: none /// Default Value: null /// [CommonDependencyProperty] public static readonly DependencyProperty HeaderTemplateSelectorProperty = HeaderedContentControl.HeaderTemplateSelectorProperty.AddOwner( typeof(HeaderedItemsControl), new FrameworkPropertyMetadata( (DataTemplateSelector) null, new PropertyChangedCallback(OnHeaderTemplateSelectorChanged))); ////// HeaderTemplateSelector allows the application writer to provide custom logic /// for choosing the template used to display the header of each item. /// ////// This property is ignored if [Bindable(true), CustomCategory("Content")] public DataTemplateSelector HeaderTemplateSelector { get { return (DataTemplateSelector) GetValue(HeaderTemplateSelectorProperty); } set { SetValue(HeaderTemplateSelectorProperty, value); } } ///is set. /// /// Called when HeaderTemplateSelectorProperty is invalidated on "d." /// private static void OnHeaderTemplateSelectorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { HeaderedItemsControl ctrl = (HeaderedItemsControl) d; ctrl.OnHeaderTemplateSelectorChanged((DataTemplateSelector) e.OldValue, (DataTemplateSelector) e.NewValue); } ////// This method is invoked when the HeaderTemplateSelector property changes. /// /// The old value of the HeaderTemplateSelector property. /// The new value of the HeaderTemplateSelector property. protected virtual void OnHeaderTemplateSelectorChanged(DataTemplateSelector oldHeaderTemplateSelector, DataTemplateSelector newHeaderTemplateSelector) { Helper.CheckTemplateAndTemplateSelector("Header", HeaderTemplateProperty, HeaderTemplateSelectorProperty, this); } #endregion #region Internal Methods ////// Prepare to display the item. /// internal void PrepareHeaderedItemsControl(object item, DataTemplate itemTemplate, DataTemplateSelector itemTemplateSelector, Style itemContainerStyle, StyleSelector itemContainerStyleSelector) { bool headerIsNotLogical = item != this; // don't treat Header as a logical child SetBoolField(BoolField.HeaderIsNotLogical, headerIsNotLogical); // copy styles from parent ItemsControl PrepareItemsControl(item, itemTemplate, itemTemplateSelector, itemContainerStyle, itemContainerStyleSelector); if (headerIsNotLogical) { if (HeaderIsItem || !HasNonDefaultValue(HeaderProperty)) { Header = item; HeaderIsItem = true; } if (itemTemplate != null) SetValue(HeaderTemplateProperty, itemTemplate); if (itemTemplateSelector != null) SetValue(HeaderTemplateSelectorProperty, itemTemplateSelector); PrepareHierarchy(item, itemTemplate, itemTemplateSelector); } } ////// Gives a string representation of this object. /// ///internal override string GetPlainText() { return ContentControl.ContentObjectToString(Header); } #endregion #region Method Overrides /// /// Gives a string representation of this object. /// public override string ToString() { string typeText = this.GetType().ToString(); string headerText = String.Empty; int itemCount = 0; bool valuesDefined = false; // Accessing Header's content may be thread sensitive if (CheckAccess()) { headerText = ContentControl.ContentObjectToString(Header); // HasItems may be wrong when underlying collection does not notify, // but this function should try to return what's consistent with ItemsControl state. itemCount = HasItems ? Items.Count : 0; valuesDefined = true; } else { //Not on dispatcher, try posting to the dispatcher with 20ms timeout Dispatcher.Invoke(DispatcherPriority.Send, new TimeSpan(0, 0, 0, 0, 20), new DispatcherOperationCallback(delegate(object o) { headerText = ContentControl.ContentObjectToString(Header); // HasItems may be wrong when underlying collection does not notify, // but this function should try to return what's consistent with ItemsControl state. itemCount = HasItems ? Items.Count : 0; valuesDefined = true; return null; }), null); } // If header and items count are defined if (valuesDefined) { return SR.Get(SRID.ToStringFormatString_HeaderedItemsControl, typeText, headerText, itemCount); } // Not able to access the dispatcher return typeText; } #endregion #region LogicalTree ////// Returns enumerator to logical children /// protected internal override IEnumerator LogicalChildren { get { object header = Header; if (GetBoolField(BoolField.HeaderIsNotLogical) || header == null) { return base.LogicalChildren; } return new HeaderedItemsModelTreeEnumerator(this, base.LogicalChildren, header); } } #endregion #region Private methods // As a convenience for hierarchical data, get the header template and // if it's a HierarchicalDataTemplate, set the ItemsSource, ItemTemplate, // and ItemTemplateSelector properties from the template. void PrepareHierarchy(object item, DataTemplate itemTemplate, DataTemplateSelector itemTemplateSelector) { // get the effective header template DataTemplate headerTemplate = HeaderTemplate; if (headerTemplate == null) { DataTemplateSelector selector = HeaderTemplateSelector; if (selector != null) { headerTemplate = selector.SelectTemplate(item, this); } } if (headerTemplate == null) { headerTemplate = (DataTemplate)FindTemplateResourceInternal(this, item, typeof(DataTemplate)); if (headerTemplate != null) { // if we discovered the template by a type-based resource lookup, // set it locally. This means the ContentPresenter that displays // the header won't have to do another lookup, but also means // that if the CP's lookup would have produced a different result, // we won't use it. ClearValue(HeaderTemplateProperty); // remove binding HeaderTemplate = headerTemplate; } } // if the effective template is a HierarchicalDataTemplate, forward // the special properties HierarchicalDataTemplate hTemplate = headerTemplate as HierarchicalDataTemplate; if (hTemplate != null) { bool templateMatches = (ItemTemplate == itemTemplate); if (hTemplate.ItemsSource != null && !HasNonDefaultValue(ItemsSourceProperty)) { SetBinding(ItemsSourceProperty, hTemplate.ItemsSource); SetBoolField(BoolField.ItemsSourceSet, true); } if (hTemplate.IsItemTemplateSelectorSet && ItemTemplateSelector == itemTemplateSelector) { // if the HDT defines a template selector, turn off the // forwarding of ItemTemplate (which would get in the way). ClearValue(ItemTemplateProperty); SetBoolField(BoolField.ItemTemplateSet, false); // forward the HDT's template selector ClearValue(ItemTemplateSelectorProperty); bool setItemTemplateSelector = (hTemplate.ItemTemplateSelector != null); if (setItemTemplateSelector) { ItemTemplateSelector = hTemplate.ItemTemplateSelector; } SetBoolField(BoolField.ItemTemplateSelectorSet, setItemTemplateSelector); } if (hTemplate.IsItemTemplateSet && templateMatches) { // forward the HDT's template ClearValue(ItemTemplateProperty); bool setItemTemplate = (hTemplate.ItemTemplate != null); if (setItemTemplate) { ItemTemplate = hTemplate.ItemTemplate; } SetBoolField(BoolField.ItemTemplateSet, setItemTemplate); } } } // return true if the dp is bound via the given Binding bool IsBound(DependencyProperty dp, Binding binding) { BindingExpressionBase bindExpr = BindingOperations.GetBindingExpression(this, dp); return (bindExpr != null && bindExpr.ParentBindingBase == binding); } // return true if the Header should be a logical child bool IsHeaderLogical() { // use cached result, if available if (GetBoolField(BoolField.HeaderIsNotLogical)) return false; // if Header property is data-bound, it should not be logical if (BindingOperations.IsDataBound(this, HeaderProperty)) { SetBoolField(BoolField.HeaderIsNotLogical, true); return false; } // otherwise, Header is logical return true; } // return true if the Header is a data item bool HeaderIsItem { get { return GetBoolField(BoolField.HeaderIsItem); } set { SetBoolField(BoolField.HeaderIsItem, value); } } private bool GetBoolField(BoolField field) { return (_boolFieldStore & field) != 0; } private void SetBoolField(BoolField field,bool value) { if (value) { _boolFieldStore |= field; } else { _boolFieldStore &= (~field); } } #endregion Private methods #region Data [System.Flags] private enum BoolField : uint { HeaderIsItem = 0x00000004, HeaderIsNotLogical = 0x00000008, ItemsSourceSet = 0x00000010, ItemTemplateSet = 0x00000020, ItemTemplateSelectorSet = 0x00000040, } private BoolField _boolFieldStore; #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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