public static void OnAutoScrollToEndChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
var itemsControl = s as ItemsControl;
if (itemsControl != null)
{
var itemsControlItems = itemsControl.Items;
var data = itemsControlItems.SourceCollection as INotifyCollectionChanged;
var scrollToEndHandler = new NotifyCollectionChangedEventHandler(
(s1, e1) =>
{
if (itemsControl.Items.Count > 0)
{
ExecuteOnUIThread.Invoke(() =>
{
ScrollViewer scrollViewer = VisualTree.GetDescendantByType <ScrollViewer>(itemsControl);
scrollViewer?.ScrollToEnd();
});
}
});
if (data != null)
{
if ((bool)e.NewValue)
{
data.CollectionChanged += scrollToEndHandler;
}
else
{
data.CollectionChanged -= scrollToEndHandler;
}
}
}
}
public static void OnAutoScrollToSelectedItemChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
var listBox = s as ListBox;
if (listBox != null)
{
var scrollToSelectionHandler = new SelectionChangedEventHandler(
(sender, args) => ExecuteOnUIThread.InvokeAsync(() =>
{
//listBox.UpdateLayout();
listBox.Focus(); // set focus to display selected item in blue instead of gray because list is not focused
if (listBox.SelectedItem != null)
{
listBox.ScrollIntoView(listBox.SelectedItem);
}
}, DispatcherPriority.ContextIdle));
if ((bool)e.NewValue)
{
listBox.SelectionChanged += scrollToSelectionHandler;
}
else
{
listBox.SelectionChanged -= scrollToSelectionHandler;
}
}
}
private static object OnIsFocusedPropertyChanged(DependencyObject d, object value)
{
var uie = (UIElement)d;
if ((bool)value)
{
//uie.Focus(); // Don't care about false values.
//Keyboard.Focus(uie);
//FocusManager.SetFocusedElement(d, uie);
ExecuteOnUIThread.InvokeAsync(() => Keyboard.Focus(uie), DispatcherPriority.ContextIdle);
}
return(value);
}
public static void OnAutoScrollToEndChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
var listBox = s as ListBox;
if (listBox != null)
{
var listBoxItems = listBox.Items;
var data = listBoxItems.SourceCollection as INotifyCollectionChanged;
var scrollToEndHandler = new NotifyCollectionChangedEventHandler(
(s1, e1) =>
{
if (listBox.Items.Count > 0)
{
//object lastItem = listBox.Items[listBox.Items.Count - 1];
//listBoxItems.MoveCurrentTo(lastItem);
//listBox.ScrollIntoView(lastItem);
ExecuteOnUIThread.Invoke(() =>
{
ScrollViewer scrollViewer = VisualTree.GetDescendantByType <ScrollViewer>(listBox);
scrollViewer?.ScrollToEnd();
});
}
});
if (data != null)
{
if ((bool)e.NewValue)
{
data.CollectionChanged += scrollToEndHandler;
}
else
{
data.CollectionChanged -= scrollToEndHandler;
}
}
}
}