private void ItemsControl_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
foreach (var book in e.Value as ObservableCollection <BookViewModel> )
{
book.Cleanup();
}
}
/// <summary>Raises the <see cref="E:System.Windows.Controls.VirtualizingStackPanel.CleanUpVirtualizedItem" /> event for rows that have scrolled out of view. </summary>
/// <param name="e">The event data.</param>
// Token: 0x06005D57 RID: 23895 RVA: 0x001A45ED File Offset: 0x001A27ED
protected override void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
base.OnCleanUpVirtualizedItem(e);
if (e.UIElement != null && Validation.GetHasError(e.UIElement))
{
e.Cancel = true;
}
}
private bool NotifyCleanupItem(UIElement child, ItemsControl itemsControl)
{
CleanUpVirtualizedItemEventArgs e = new CleanUpVirtualizedItemEventArgs(child, itemsControl.ItemContainerGenerator.ItemFromContainer(child));
e.OriginalSource = this;
OnCleanUpVirtualizedItem(e);
return(!e.Cancel);
}
private void CleanUpVirtualizedItemHandler(object sender, CleanUpVirtualizedItemEventArgs e)
{
//System.Diagnostics.Debug.WriteLine(string.Format("UnLoadingRow index={0}", (e.UIElement as DataGridRow).GetIndex()));
if (updatedWindowLock == false)
{
int i = (e.UIElement as DataGridRow).GetIndex();
updatedWindow.Remove(i);
}
}
/// <summary>
/// Called when an item that is hosted by the <see cref="VirtualizingStackPanel"/>
/// is re-virtualized.
/// </summary>
/// <param name="e">
/// Data about the event.
/// </param>
protected virtual void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
CleanUpVirtualizedItemEventHandler handler = CleanUpVirtualizedItemEvent;
if (handler != null)
{
handler(this, e);
}
}
public void VirtualizingStackPanel_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
// Get a reference to the WriteableBitmap before nullifying the property to release the reference
Thumbnail thumbnail = (Thumbnail)e.Value;
WriteableBitmap thumbnailImage = (WriteableBitmap)thumbnail.Image;
thumbnail.Image = null;
// Asynchronously add the WriteableBitmap back to the cache
Dispatcher.BeginInvoke((Action)(() =>
{
_writeableBitmapCache.Enqueue(thumbnailImage);
}), System.Windows.Threading.DispatcherPriority.Loaded);
}
//private void ReportButton_Click(object sender, System.Windows.RoutedEventArgs e)
//{
// DesignValidationContext cxt = this.DataContext as DesignValidationContext;
// if (cxt == null)
// {
// Debug.Assert(false);
// return;
// }
// AudDocument audDoc = AudApplication.DocumentManager.Active;
// ValidationItemReport report = new ValidationItemReport(audDoc);
// foreach (ValidationGroupContext grp in cxt.ValidationGroups)
// report.AddValidationItems(
// from ValidationItemContextBase vicb in grp.ValidationResultItems
// select vicb.ValidationItem, true);
// report.Report(Properties.Resources.DesignValidation);
//}
//private void ResolveButton_Click(object sender, System.Windows.RoutedEventArgs e)
//{
// DesignValidationContext cxt = this.DataContext as DesignValidationContext;
// if (cxt != null)
// cxt.ResolveAll();
//}
private void validationGroupsControl_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
if (e == null)
{
return;
}
ValidationGroupContext group = e.Value as ValidationGroupContext;
if (group == null)
{
return;
}
group.DisconnectByVirtualizationCleanup();
}
protected override void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
if (e.UIElement is ListBoxItem item && item.IsSelected)
{
e.Cancel = true;
e.Handled = true;
return;
}
if (e.UIElement is TreeViewItem item2 && item2.IsSelected)
{
e.Cancel = true;
e.Handled = true;
return;
}
base.OnCleanUpVirtualizedItem(e);
}
protected override void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
var item = e.UIElement as ListBoxItem;
if (item != null && item.IsSelected)
{
e.Cancel = true;
e.Handled = true;
return;
}
var item2 = e.UIElement as TreeViewItem;
if (item2 != null && item2.IsSelected)
{
e.Cancel = true;
e.Handled = true;
return;
}
base.OnCleanUpVirtualizedItem(e);
}
private static void OnCleanUpEvent(object sender, CleanUpVirtualizedItemEventArgs e)
{
var control = sender as ListBox;
if (control == null)
{
return;
}
ICommand cleanupCommand = CleanUpVirtualizedItemsBehavior.GetCleanUpItemCommand(control);
// Check whether this attached behaviour is bound to a RoutedCommand
if (cleanupCommand is RoutedCommand)
{
// Execute the routed command
(cleanupCommand as RoutedCommand).Execute(e.Value, control);
}
else
{
// Execute the Command as bound delegate
cleanupCommand.Execute(e.Value);
}
}
void ICleanUpVirtualizedItemEventArgsResolver.Cancel(CleanUpVirtualizedItemEventArgs e, bool cancel) => e.Cancel = cancel;
UIElement ICleanUpVirtualizedItemEventArgsResolver.UIElement(CleanUpVirtualizedItemEventArgs e) => e.UIElement;
bool ICleanUpVirtualizedItemEventArgsResolver.Cancel(CleanUpVirtualizedItemEventArgs e) => e.Cancel;
/// <summary> /// Gets a reference to the object that raised the event. /// This is often a template part of a control rather than an element that was declared in your app UI. /// </summary> /// <param name="e">The requested <see cref="CleanUpVirtualizedItemEventArgs"/>.</param> /// <returns>The object that raised the event.</returns> public static object OriginalSource(this CleanUpVirtualizedItemEventArgs e) => Resolver.OriginalSource(e);
object ICleanUpVirtualizedItemEventArgsResolver.Value(CleanUpVirtualizedItemEventArgs e) => e.Value;
private void CleanUpVirtualizedItemHandler(object sender, CleanUpVirtualizedItemEventArgs args)
{
args.Cancel = DataGridHelper.CanBeRecycled(args.UIElement);
}
/// <summary> /// Sets a value that indicates whether this item should not be revirtualized. /// </summary> /// <param name="e">The requested <see cref="CleanUpVirtualizedItemEventArgs"/>.</param> /// <param name="cancel"><c>true</c> if you want to prevent revirtualization of this item; otherwise, <c>false</c>.</param> public static void Cancel(this CleanUpVirtualizedItemEventArgs e, bool cancel) => Resolver.Cancel(e, cancel);
/// <summary> /// Gets an object that represents the original data value. /// </summary> /// <param name="e">The requested <see cref="CleanUpVirtualizedItemEventArgs"/>.</param> /// <returns>The Object that represents the original data value.</returns> public static object Value(this CleanUpVirtualizedItemEventArgs e) => Resolver.Value(e);
/// <summary> /// Gets an instance of the visual element that represents the data value. /// </summary> /// <param name="e">The requested <see cref="CleanUpVirtualizedItemEventArgs"/>.</param> /// <returns>The UIElement that represents the data value.</returns> public static UIElement UIElement(this CleanUpVirtualizedItemEventArgs e) => Resolver.UIElement(e);
private void RowDefinition_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
}
private void BrowserListBox_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
}
private void View_List_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
(e.UIElement as FrameworkElement).Unloaded += ViewPage_Unloaded;
}
/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// cleanupvirtualizeditemeventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this CleanUpVirtualizedItemEventHandler cleanupvirtualizeditemeventhandler, Object sender, CleanUpVirtualizedItemEventArgs e, AsyncCallback callback)
{
if (cleanupvirtualizeditemeventhandler == null)
{
throw new ArgumentNullException("cleanupvirtualizeditemeventhandler");
}
return(cleanupvirtualizeditemeventhandler.BeginInvoke(sender, e, callback, null));
}
private void Dg_win_regex_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
}
object ICleanUpVirtualizedItemEventArgsResolver.OriginalSource(CleanUpVirtualizedItemEventArgs e) => e.OriginalSource;
/// <summary> /// Gets a value that indicates whether this item should not be revirtualized. /// </summary> /// <param name="e">The requested <see cref="CleanUpVirtualizedItemEventArgs"/>.</param> /// <returns><c>true</c> if you want to prevent revirtualization of this item; otherwise, <c>false</c>.</returns> public static bool Cancel(this CleanUpVirtualizedItemEventArgs e) => Resolver.Cancel(e);
private void VirtualizingStackPanel_OnCleanUpVirtualizedItemEvent(object sender, CleanUpVirtualizedItemEventArgs e)
{
}
protected override void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e)
{
e.UIElement.ClearValue(OffsetProperty);
base.OnCleanUpVirtualizedItem(e);
}
private void Differences_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e)
{
}
// 虚拟化缓存中的某一项数据被移除时触发的事件
// 对于 Recycling 模式来说，老的数据被移除后会有新的数据添加进来
private void VirtualizingStackPanel_CleanUpVirtualizedItemEvent(object sender, CleanUpVirtualizedItemEventArgs e)
{
// 此次被移除虚拟化缓存的数据对象
lblMsg.Text += "cleanUp: " + (e.Value as Employee).Name;
lblMsg.Text += Environment.NewLine;
// 此次被移除虚拟化缓存的 UIElement
// UIElement element = e.UIElement;
// 是否禁止此条虚拟化数据被移除
// e.Cancel = false;
}
