In your example there are two controls inherited from ScrollViewer and ListBox, the animation is implemented by SplineDoubleKeyFrame [MSDN]. In my time, I realized animation scrolling via the attached dependency property VerticalOffsetProperty, which allows you to directly transfer offset scrollbar into a double animation, like this:
DoubleAnimation verticalAnimation = new DoubleAnimation();
verticalAnimation.From = scrollViewer.VerticalOffset;
verticalAnimation.To = some value;
verticalAnimation.Duration = new Duration( some duration );
Storyboard storyboard = new Storyboard();
storyboard.Children.Add(verticalAnimation);
Storyboard.SetTarget(verticalAnimation, scrollViewer);
Storyboard.SetTargetProperty(verticalAnimation, new PropertyPath(ScrollAnimationBehavior.VerticalOffsetProperty)); // Attached dependency property
storyboard.Begin();
Examples can be found here:
How to: Animate the Horizontal/VerticalOffset properties of a ScrollViewer
WPF – Animate ListBox.ScrollViewer.HorizontalOffset?
In this case, works well smooth scrolling of the content and the Thumb. Based on this approach, and using your example [How To Create An Animated ScrollViewer (or ListBox) in WPF], I created an attached behavior ScrollAnimationBehavior, which can be applied to ScrollViewerand ListBox.
Example of using:
XAML
<Window x:Class="ScrollAnimateBehavior.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:AttachedBehavior="clr-namespace:ScrollAnimateBehavior.AttachedBehaviors"
Title="MainWindow"
WindowStartupLocation="CenterScreen"
Height="350"
Width="525">
<Window.Resources>
<x:Array x:Key="TestArray" Type="{x:Type sys:String}">
<sys:String>TEST 1</sys:String>
<sys:String>TEST 2</sys:String>
<sys:String>TEST 3</sys:String>
<sys:String>TEST 4</sys:String>
<sys:String>TEST 5</sys:String>
<sys:String>TEST 6</sys:String>
<sys:String>TEST 7</sys:String>
<sys:String>TEST 8</sys:String>
<sys:String>TEST 9</sys:String>
<sys:String>TEST 10</sys:String>
</x:Array>
</Window.Resources>
<Grid>
<TextBlock Text="ScrollViewer"
FontFamily="Verdana"
FontSize="14"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Margin="80,80,0,0" />
<ScrollViewer AttachedBehavior:ScrollAnimationBehavior.IsEnabled="True"
AttachedBehavior:ScrollAnimationBehavior.TimeDuration="00:00:00.20"
AttachedBehavior:ScrollAnimationBehavior.PointsToScroll="16"
HorizontalAlignment="Left"
Width="250"
Height="100">
<StackPanel>
<ItemsControl ItemsSource="{StaticResource TestArray}"
FontSize="16" />
</StackPanel>
</ScrollViewer>
<TextBlock Text="ListBox"
FontFamily="Verdana"
FontSize="14"
VerticalAlignment="Top"
HorizontalAlignment="Right"
Margin="0,80,100,0" />
<ListBox AttachedBehavior:ScrollAnimationBehavior.IsEnabled="True"
ItemsSource="{StaticResource TestArray}"
ScrollViewer.CanContentScroll="False"
HorizontalAlignment="Right"
FontSize="16"
Width="250"
Height="100" />
</Grid>
</Window>
Output
IsEnabled property is responsible for the scrolling animation for ScrollViewer and for ListBox. Below its implementation:
public static DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached("IsEnabled",
typeof(bool),
typeof(ScrollAnimationBehavior),
new UIPropertyMetadata(false, OnIsEnabledChanged));
public static void SetIsEnabled(FrameworkElement target, bool value)
{
target.SetValue(IsEnabledProperty, value);
}
public static bool GetIsEnabled(FrameworkElement target)
{
return (bool)target.GetValue(IsEnabledProperty);
}
private static void OnIsEnabledChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
var target = sender;
if (target != null && target is ScrollViewer)
{
ScrollViewer scroller = target as ScrollViewer;
scroller.Loaded += new RoutedEventHandler(scrollerLoaded);
}
if (target != null && target is ListBox)
{
ListBox listbox = target as ListBox;
listbox.Loaded += new RoutedEventHandler(listboxLoaded);
}
}
In these Loaded handlers are set event handlers for PreviewMouseWheel and PreviewKeyDown.
Helpers (auxiliary procedures) are taken from the example and provide a value of double type, which is passed to the procedure AnimateScroll(). Here and are the magic key of animation:
private static void AnimateScroll(ScrollViewer scrollViewer, double ToValue)
{
DoubleAnimation verticalAnimation = new DoubleAnimation();
verticalAnimation.From = scrollViewer.VerticalOffset;
verticalAnimation.To = ToValue;
verticalAnimation.Duration = new Duration(GetTimeDuration(scrollViewer));
Storyboard storyboard = new Storyboard();
storyboard.Children.Add(verticalAnimation);
Storyboard.SetTarget(verticalAnimation, scrollViewer);
Storyboard.SetTargetProperty(verticalAnimation, new PropertyPath(ScrollAnimationBehavior.VerticalOffsetProperty));
storyboard.Begin();
}
Some notes
-
The example only implemented vertical animation, if you will accept this project, you will realize itself without problems horizontal animation.
-
Selection of the current item in
ListBoxnot transferred to the next element of this is due to the interception of eventsPreviewKeyDown, so you have to think about this moment. -
This implementation is fully suited for the MVVM pattern. To use this behavior in the
Blend, you need to inherit interfaceBehavior. Example can be found here and here.
Tested on Windows XP, Windows Seven, .NET 4.0.
Sample project is available at this link.
Below is a full code of this implementation:
public static class ScrollAnimationBehavior
{
#region Private ScrollViewer for ListBox
private static ScrollViewer _listBoxScroller = new ScrollViewer();
#endregion
#region VerticalOffset Property
public static DependencyProperty VerticalOffsetProperty =
DependencyProperty.RegisterAttached("VerticalOffset",
typeof(double),
typeof(ScrollAnimationBehavior),
new UIPropertyMetadata(0.0, OnVerticalOffsetChanged));
public static void SetVerticalOffset(FrameworkElement target, double value)
{
target.SetValue(VerticalOffsetProperty, value);
}
public static double GetVerticalOffset(FrameworkElement target)
{
return (double)target.GetValue(VerticalOffsetProperty);
}
#endregion
#region TimeDuration Property
public static DependencyProperty TimeDurationProperty =
DependencyProperty.RegisterAttached("TimeDuration",
typeof(TimeSpan),
typeof(ScrollAnimationBehavior),
new PropertyMetadata(new TimeSpan(0, 0, 0, 0, 0)));
public static void SetTimeDuration(FrameworkElement target, TimeSpan value)
{
target.SetValue(TimeDurationProperty, value);
}
public static TimeSpan GetTimeDuration(FrameworkElement target)
{
return (TimeSpan)target.GetValue(TimeDurationProperty);
}
#endregion
#region PointsToScroll Property
public static DependencyProperty PointsToScrollProperty =
DependencyProperty.RegisterAttached("PointsToScroll",
typeof(double),
typeof(ScrollAnimationBehavior),
new PropertyMetadata(0.0));
public static void SetPointsToScroll(FrameworkElement target, double value)
{
target.SetValue(PointsToScrollProperty, value);
}
public static double GetPointsToScroll(FrameworkElement target)
{
return (double)target.GetValue(PointsToScrollProperty);
}
#endregion
#region OnVerticalOffset Changed
private static void OnVerticalOffsetChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
{
ScrollViewer scrollViewer = target as ScrollViewer;
if (scrollViewer != null)
{
scrollViewer.ScrollToVerticalOffset((double)e.NewValue);
}
}
#endregion
#region IsEnabled Property
public static DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached("IsEnabled",
typeof(bool),
typeof(ScrollAnimationBehavior),
new UIPropertyMetadata(false, OnIsEnabledChanged));
public static void SetIsEnabled(FrameworkElement target, bool value)
{
target.SetValue(IsEnabledProperty, value);
}
public static bool GetIsEnabled(FrameworkElement target)
{
return (bool)target.GetValue(IsEnabledProperty);
}
#endregion
#region OnIsEnabledChanged Changed
private static void OnIsEnabledChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
var target = sender;
if (target != null && target is ScrollViewer)
{
ScrollViewer scroller = target as ScrollViewer;
scroller.Loaded += new RoutedEventHandler(scrollerLoaded);
}
if (target != null && target is ListBox)
{
ListBox listbox = target as ListBox;
listbox.Loaded += new RoutedEventHandler(listboxLoaded);
}
}
#endregion
#region AnimateScroll Helper
private static void AnimateScroll(ScrollViewer scrollViewer, double ToValue)
{
DoubleAnimation verticalAnimation = new DoubleAnimation();
verticalAnimation.From = scrollViewer.VerticalOffset;
verticalAnimation.To = ToValue;
verticalAnimation.Duration = new Duration(GetTimeDuration(scrollViewer));
Storyboard storyboard = new Storyboard();
storyboard.Children.Add(verticalAnimation);
Storyboard.SetTarget(verticalAnimation, scrollViewer);
Storyboard.SetTargetProperty(verticalAnimation, new PropertyPath(ScrollAnimationBehavior.VerticalOffsetProperty));
storyboard.Begin();
}
#endregion
#region NormalizeScrollPos Helper
private static double NormalizeScrollPos(ScrollViewer scroll, double scrollChange, Orientation o)
{
double returnValue = scrollChange;
if (scrollChange < 0)
{
returnValue = 0;
}
if (o == Orientation.Vertical && scrollChange > scroll.ScrollableHeight)
{
returnValue = scroll.ScrollableHeight;
}
else if (o == Orientation.Horizontal && scrollChange > scroll.ScrollableWidth)
{
returnValue = scroll.ScrollableWidth;
}
return returnValue;
}
#endregion
#region UpdateScrollPosition Helper
private static void UpdateScrollPosition(object sender)
{
ListBox listbox = sender as ListBox;
if (listbox != null)
{
double scrollTo = 0;
for (int i = 0; i < (listbox.SelectedIndex); i++)
{
ListBoxItem tempItem = listbox.ItemContainerGenerator.ContainerFromItem(listbox.Items[i]) as ListBoxItem;
if (tempItem != null)
{
scrollTo += tempItem.ActualHeight;
}
}
AnimateScroll(_listBoxScroller, scrollTo);
}
}
#endregion
#region SetEventHandlersForScrollViewer Helper
private static void SetEventHandlersForScrollViewer(ScrollViewer scroller)
{
scroller.PreviewMouseWheel += new MouseWheelEventHandler(ScrollViewerPreviewMouseWheel);
scroller.PreviewKeyDown += new KeyEventHandler(ScrollViewerPreviewKeyDown);
}
#endregion
#region scrollerLoaded Event Handler
private static void scrollerLoaded(object sender, RoutedEventArgs e)
{
ScrollViewer scroller = sender as ScrollViewer;
SetEventHandlersForScrollViewer(scroller);
}
#endregion
#region listboxLoaded Event Handler
private static void listboxLoaded(object sender, RoutedEventArgs e)
{
ListBox listbox = sender as ListBox;
_listBoxScroller = FindVisualChildHelper.GetFirstChildOfType<ScrollViewer>(listbox);
SetEventHandlersForScrollViewer(_listBoxScroller);
SetTimeDuration(_listBoxScroller, new TimeSpan(0, 0, 0, 0, 200));
SetPointsToScroll(_listBoxScroller, 16.0);
listbox.SelectionChanged += new SelectionChangedEventHandler(ListBoxSelectionChanged);
listbox.Loaded += new RoutedEventHandler(ListBoxLoaded);
listbox.LayoutUpdated += new EventHandler(ListBoxLayoutUpdated);
}
#endregion
#region ScrollViewerPreviewMouseWheel Event Handler
private static void ScrollViewerPreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
double mouseWheelChange = (double)e.Delta;
ScrollViewer scroller = (ScrollViewer)sender;
double newVOffset = GetVerticalOffset(scroller) - (mouseWheelChange / 3);
if (newVOffset < 0)
{
AnimateScroll(scroller, 0);
}
else if (newVOffset > scroller.ScrollableHeight)
{
AnimateScroll(scroller, scroller.ScrollableHeight);
}
else
{
AnimateScroll(scroller, newVOffset);
}
e.Handled = true;
}
#endregion
#region ScrollViewerPreviewKeyDown Handler
private static void ScrollViewerPreviewKeyDown(object sender, KeyEventArgs e)
{
ScrollViewer scroller = (ScrollViewer)sender;
Key keyPressed = e.Key;
double newVerticalPos = GetVerticalOffset(scroller);
bool isKeyHandled = false;
if (keyPressed == Key.Down)
{
newVerticalPos = NormalizeScrollPos(scroller, (newVerticalPos + GetPointsToScroll(scroller)), Orientation.Vertical);
isKeyHandled = true;
}
else if (keyPressed == Key.PageDown)
{
newVerticalPos = NormalizeScrollPos(scroller, (newVerticalPos + scroller.ViewportHeight), Orientation.Vertical);
isKeyHandled = true;
}
else if (keyPressed == Key.Up)
{
newVerticalPos = NormalizeScrollPos(scroller, (newVerticalPos - GetPointsToScroll(scroller)), Orientation.Vertical);
isKeyHandled = true;
}
else if (keyPressed == Key.PageUp)
{
newVerticalPos = NormalizeScrollPos(scroller, (newVerticalPos - scroller.ViewportHeight), Orientation.Vertical);
isKeyHandled = true;
}
if (newVerticalPos != GetVerticalOffset(scroller))
{
AnimateScroll(scroller, newVerticalPos);
}
e.Handled = isKeyHandled;
}
#endregion
#region ListBox Event Handlers
private static void ListBoxLayoutUpdated(object sender, EventArgs e)
{
UpdateScrollPosition(sender);
}
private static void ListBoxLoaded(object sender, RoutedEventArgs e)
{
UpdateScrollPosition(sender);
}
private static void ListBoxSelectionChanged(object sender, SelectionChangedEventArgs e)
{
UpdateScrollPosition(sender);
}
#endregion
}