/// <summary>
/// Command to toggle scrolling animation.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">Event arguments describing the event.</param>
private static void OnToggleScrollingAnimationCommand(object sender, ExecutedRoutedEventArgs e)
{
ScaleScrollViewer scaleScrollViewer = sender as ScaleScrollViewer;
if (scaleScrollViewer != null)
{
scaleScrollViewer.ToggleScrollingAnimation();
}
}
private static void ScaleChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
ScaleScrollViewer ssv = (ScaleScrollViewer)sender;
double scale = (double)args.NewValue;
if (ssv.scaleTransform != null)
{
ssv.scaleTransform.ScaleX = scale;
ssv.scaleTransform.ScaleY = scale;
}
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_friendBar = (FriendBarControl)Template.FindName("PART_FriendBar", this);
Assert.IsNotNull(_friendBar);
_friendBar.SetActiveItem(FacebookContact);
_wallScrollViewer = (ScaleScrollViewer)Template.FindName("PART_WallScrollViewer", this);
Assert.IsNotNull(_wallScrollViewer);
// Focus the control so that we can grab keyboard events.
this.Focus();
}
private static object CoerceScale(DependencyObject sender, object value)
{
ScaleScrollViewer ssv = (ScaleScrollViewer)sender;
double scale = (double)value;
if (scale > ssv.MaxScale)
{
scale = ssv.MaxScale;
}
if (scale < ssv.MinScale)
{
scale = ssv.MinScale;
}
return(scale);
}
private static void OnFinalVerticalOffsetChanged(object sender, DependencyPropertyChangedEventArgs e)
{
double newValue = (double)e.NewValue;
ScaleScrollViewer ssv = sender as ScaleScrollViewer;
if (ssv.disableAnimation || !ssv.IsAnimationEnabled)
{
ssv.disableAnimation = false;
ssv.BeginAnimation(ScaleScrollViewer.ActualVerticalOffsetProperty, null);
ssv.ActualVerticalOffset = newValue;
}
else
{
DoubleAnimationUsingKeyFrames animation = new DoubleAnimationUsingKeyFrames();
animation.KeyFrames.Add(new SplineDoubleKeyFrame(newValue, s_animationDuration, s_animationSpline));
ssv.BeginAnimation(ScaleScrollViewer.ActualVerticalOffsetProperty, animation);
}
}
private static void OnActualVerticalOffsetChanged(object sender, DependencyPropertyChangedEventArgs e)
{
ScaleScrollViewer ssv = sender as ScaleScrollViewer;
ssv.ScrollToVerticalOffset(ssv.ActualVerticalOffset);
}
private static void MinMaxScaleChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
ScaleScrollViewer ssv = (ScaleScrollViewer)sender;
ssv.CoerceValue(ScaleScrollViewer.ScaleProperty);
}
