Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / HeaderedContentControl.cs / 1 / HeaderedContentControl.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Collections; using System.ComponentModel; using System.Windows; using System.Windows.Data; using System.Windows.Threading; using System.Windows.Media; using MS.Utility; using MS.Internal; using MS.Internal.Controls; using MS.Internal.Data; using MS.Internal.KnownBoxes; using MS.Internal.PresentationFramework; namespace System.Windows.Controls { ////// The base class for all controls that contain single content and have a header. /// ////// HeaderedContentControl adds Header, HasHeader, HeaderTemplate, and HeaderTemplateSelector features to a ContentControl. /// [Localizability(LocalizationCategory.Text)] // can contain localizable text public class HeaderedContentControl : ContentControl { #region Constructors static HeaderedContentControl() { DefaultStyleKeyProperty.OverrideMetadata(typeof(HeaderedContentControl), new FrameworkPropertyMetadata(typeof(HeaderedContentControl))); _dType = DependencyObjectType.FromSystemTypeInternal(typeof(HeaderedContentControl)); } ////// Default DependencyObject constructor /// public HeaderedContentControl() : base() { } #endregion #region Properties ////// The DependencyProperty for the Header property. /// Flags: None /// Default Value: null /// [CommonDependencyProperty] public static readonly DependencyProperty HeaderProperty = DependencyProperty.Register( "Header", typeof(object), typeof(HeaderedContentControl), new FrameworkPropertyMetadata( (object) null, new PropertyChangedCallback(OnHeaderChanged))); ////// Header is the data used to for the header of each item in the control. /// [Bindable(true), Category("Content")] [Localizability(LocalizationCategory.Label)] 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) { HeaderedContentControl ctrl = (HeaderedContentControl) 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) { RemoveLogicalChild(oldHeader); AddLogicalChild(newHeader); } ////// The key needed set a read-only property. /// internal static readonly DependencyPropertyKey HasHeaderPropertyKey = DependencyProperty.RegisterReadOnly( "HasHeader", typeof(bool), typeof(HeaderedContentControl), new FrameworkPropertyMetadata(BooleanBoxes.FalseBox)); ////// The DependencyProperty for the HasHeader property. /// Flags: None /// Other: Read-Only /// Default Value: false /// [CommonDependencyProperty] public static readonly DependencyProperty HasHeaderProperty = HasHeaderPropertyKey.DependencyProperty; ////// 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 = DependencyProperty.Register( "HeaderTemplate", typeof(DataTemplate), typeof(HeaderedContentControl), new FrameworkPropertyMetadata( (DataTemplate) null, new PropertyChangedCallback(OnHeaderTemplateChanged))); ////// HeaderTemplate is the template used to display the [Bindable(true), Category("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) { HeaderedContentControl ctrl = (HeaderedContentControl)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 = DependencyProperty.Register( "HeaderTemplateSelector", typeof(DataTemplateSelector), typeof(HeaderedContentControl), new FrameworkPropertyMetadata( (DataTemplateSelector) null, new PropertyChangedCallback(OnHeaderTemplateSelectorChanged))); ////// HeaderTemplateSelector allows the application writer to provide custom logic /// for choosing the template used to display the ///. /// /// This property is ignored if [Bindable(true), Category("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) { HeaderedContentControl ctrl = (HeaderedContentControl) 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 LogicalTree ////// Returns enumerator to logical children /// protected internal override IEnumerator LogicalChildren { get { object header = Header; if (HeaderIsNotLogical || header == null) { return base.LogicalChildren; } return new HeaderedContentModelTreeEnumerator(this, ContentIsNotLogical ? null : Content, header); } } #endregion #region Internal Methods ////// Gives a string representation of this object. /// ///internal override string GetPlainText() { return ContentControl.ContentObjectToString(Header); } /// /// Indicates whether Header should be a logical child or not. /// internal bool HeaderIsNotLogical { get { return ReadControlFlag(ControlBoolFlags.HeaderIsNotLogical); } set { WriteControlFlag(ControlBoolFlags.HeaderIsNotLogical, value); } } ////// Indicates whether Header is a data item /// internal bool HeaderIsItem { get { return ReadControlFlag(ControlBoolFlags.HeaderIsItem); } set { WriteControlFlag(ControlBoolFlags.HeaderIsItem, value); } } ////// Prepare to display the item. /// internal void PrepareHeaderedContentControl(object item, DataTemplate itemTemplate, DataTemplateSelector itemTemplateSelector) { if (item != this) { // don't treat Content as a logical child ContentIsNotLogical = true; HeaderIsNotLogical = true; if (ContentIsItem || !HasNonDefaultValue(ContentProperty)) { Content = item; ContentIsItem = true; } // Visuals can't be placed in both Header and Content, but data can if (!(item is Visual) && (HeaderIsItem || !HasNonDefaultValue(HeaderProperty))) { Header = item; HeaderIsItem = true; } if (itemTemplate != null) SetValue(HeaderTemplateProperty, itemTemplate); if (itemTemplateSelector != null) SetValue(HeaderTemplateSelectorProperty, itemTemplateSelector); } else { ContentIsNotLogical = false; } } #endregion #region Method Overrides ////// Gives a string representation of this object. /// public override string ToString() { string typeText = this.GetType().ToString(); string headerText = String.Empty; string contentText = String.Empty; bool valuesDefined = false; // Accessing Header's content may be thread sensitive if (CheckAccess()) { headerText = ContentControl.ContentObjectToString(Header); contentText = ContentControl.ContentObjectToString(Content); 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); contentText = ContentControl.ContentObjectToString(Content); valuesDefined = true; return null; }), null); } // If header and content text are defined if (valuesDefined) { return SR.Get(SRID.ToStringFormatString_HeaderedContentControl, typeText, headerText, contentText); } // Not able to access the dispatcher return typeText; } #endregion #region DTypeThemeStyleKey // Returns the DependencyObjectType for the registered DefaultStyleKey's default // value. Controls will override this method to return approriate types. internal override DependencyObjectType DTypeThemeStyleKey { get { return _dType; } } private static DependencyObjectType _dType; #endregion DTypeThemeStyleKey } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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