Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / ListView.cs / 1 / ListView.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System.Collections.Specialized; using System.Windows.Automation.Peers; // OnCreateAutomationPeer namespace System.Windows.Controls { ////// A general purpose control for data presentation as part of the set of common controls provided with Avalon. /// Drop a control into a layout; /// Enable application developers to display data efficiently; /// Allow the presentation of data to be styled, including the layout and the item visuals; /// No type-specific functionality. /// /// ListView is a control which has /// A data collection; /// A set of predefined operations to manipulate the data/view. /// Also, ListView is a control for the most convenient browsing of data. /// #if OLD_AUTOMATION [Automation(AccessibilityControlType = "List")] #endif [StyleTypedProperty(Property = "ItemContainerStyle", StyleTargetType = typeof(ListViewItem))] public class ListView : ListBox { //------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors static ListView() { SelectionModeProperty.OverrideMetadata(typeof(ListView), new FrameworkPropertyMetadata(SelectionMode.Extended)); } #endregion Constructors //-------------------------------------------------------------------- // // Public Methods // //------------------------------------------------------------------- //-------------------------------------------------------------------- // // Public Properties // //-------------------------------------------------------------------- #region Public Properties ////// View DependencyProperty /// public static readonly DependencyProperty ViewProperty = DependencyProperty.Register( "View", typeof(ViewBase), typeof(ListView), new PropertyMetadata( new PropertyChangedCallback(OnViewChanged)) ); ////// descriptor of the whole view. Include chrome/layout/item/... /// public ViewBase View { get { return (ViewBase)GetValue(ViewProperty); } set { SetValue(ViewProperty, value); } } private static void OnViewChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { ListView listView = (ListView)d; ViewBase oldView = (ViewBase)e.OldValue; ViewBase newView = (ViewBase)e.NewValue; if (newView != null) { if (newView.IsUsed) { throw new InvalidOperationException(SR.Get(SRID.ListView_ViewCannotBeShared)); } newView.IsUsed = true; } // In ApplyNewView ListView.ClearContainerForItemOverride will be called for each item. // Should use old view to do clear item. listView._previousView = oldView; listView.ApplyNewView(); // After ApplyNewView, if item is removed, ListView.ClearContainerForItemOverride will be called. // Then should use new view to do clear item. listView._previousView = newView; //Switch ViewAutomationPeer in ListViewAutomationPeer ListViewAutomationPeer lvPeer = UIElementAutomationPeer.FromElement(listView) as ListViewAutomationPeer; if (lvPeer != null) { if (lvPeer.ViewAutomationPeer != null) { lvPeer.ViewAutomationPeer.ViewDetached(); } if (newView != null) { lvPeer.ViewAutomationPeer = newView.GetAutomationPeer(listView); } else { lvPeer.ViewAutomationPeer = null; } //Invalidate the ListView automation tree because the view has been changed lvPeer.InvalidatePeer(); } if (oldView != null) { oldView.IsUsed = false; } } #endregion //------------------------------------------------------------------- // // Protected Methods // //-------------------------------------------------------------------- #region Protected Methods ////// Prepare the element to display the item. Override the default style /// if new view is a GridView and no ItemContainerStyle provided. /// Will call View.PrepareItem() to allow view do preparison for item. /// protected override void PrepareContainerForItemOverride(DependencyObject element, object item) { base.PrepareContainerForItemOverride(element, item); ListViewItem lvi = element as ListViewItem; if (lvi != null) { ViewBase view = View; if (view != null) { // update default style key lvi.SetDefaultStyleKey(view.ItemContainerDefaultStyleKey); view.PrepareItem(lvi); } else { lvi.ClearDefaultStyleKey(); } } } ////// Clear the element to display the item. /// protected override void ClearContainerForItemOverride(DependencyObject element, object item) { // This method no longer does the work it used to (bug 1445288). // It is called when a container is removed from the tree; such a // container will be GC'd soon, so there's no point in changing // its properties. base.ClearContainerForItemOverride(element, item); } ///Return true if the item is (or is eligible to be) its own ItemContainer protected override bool IsItemItsOwnContainerOverride(object item) { return (item is ListViewItem); } ///Create or identify the element used to display the given item. protected override DependencyObject GetContainerForItemOverride() { return new ListViewItem(); } ////// /// /// protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e) { base.OnItemsChanged(e); ListViewAutomationPeer lvPeer = UIElementAutomationPeer.FromElement(this) as ListViewAutomationPeer; if (lvPeer != null && lvPeer.ViewAutomationPeer != null) { lvPeer.ViewAutomationPeer.ItemsChanged(e); } } #endregion // Protected Methods //------------------------------------------------------------------- // // Accessibility // //------------------------------------------------------------------- #region Accessibility ////// Creates AutomationPeer ( protected override AutomationPeer OnCreateAutomationPeer() { ListViewAutomationPeer lvPeer = new ListViewAutomationPeer(this); if (lvPeer != null && View != null) { lvPeer.ViewAutomationPeer = View.GetAutomationPeer(this); } return lvPeer; } #endregion //------------------------------------------------------------------- // // Private Methods // //-------------------------------------------------------------------- #region Private Methods // apply styles described in View. private void ApplyNewView() { ViewBase newView = View; if (newView != null) { // update default style key of ListView DefaultStyleKey = newView.DefaultStyleKey; } else { ClearValue(DefaultStyleKeyProperty); } // Encounter a new view after loaded means user is switching view. // Force to regenerate all containers. if (IsLoaded) { ItemContainerGenerator.Refresh(); } } // Invalidate resources on the view header if the header isn't // reachable via the visual/logical tree internal override void OnThemeChanged() { // If the ListView does not have a template generated tree then its // View.Header is not reachable via a tree walk. if (!HasTemplateGeneratedSubTree && View != null) { View.OnThemeChanged(); } } #endregion Private Methods //------------------------------------------------------------------- // // Private Fields // //-------------------------------------------------------------------- private ViewBase _previousView; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.) ///
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