// We create and store the animation information for the current
// state of the header the first time we need to perform an animation.
// It's stored so that an initial fade-out animation can be
// interrupted and resumed from its current state by the fade-in
// animation.
private void CreateAnimationInformation()
{
if (_animInfo == null)
{
int count = _header.Items.Count;
// We won't animate the currently selected item,
// so ensure we don't create information for it.
_animInfo = new HeaderAnimationInfo[count - 1];
int i = 0;
foreach (PivotHeaderItem headerItem in _header.Items)
{
if (!headerItem.IsSelected)
{
_animInfo[i].opacity = headerItem.Opacity;
_animInfo[i].opacityAnimator = new OpacityAnimator(headerItem);
_animInfo[i].transform =
TransformAnimator.GetTranslateTransform(headerItem);
_animInfo[i].transformAnimator =
new TransformAnimator(_animInfo[i].transform);
_animInfo[i].originalX = _animInfo[i].transform.X;
i++;
}
}
}
}
public static void EnsureAnimator(FrameworkElement targetElement, ref TransformAnimator animator)
{
if (animator == null)
{
TranslateTransform transform = TransformAnimator.GetTranslateTransform(targetElement);
if (transform != null)
{
animator = new TransformAnimator(transform);
}
}
if (animator == null)
{
throw new InvalidOperationException("The animation system could not be prepared for the target element.");
}
}
public static void EnsureAnimator(FrameworkElement targetElement, ref TransformAnimator animator)
{
if (animator == null)
{
TranslateTransform transform = TransformAnimator.GetTranslateTransform(targetElement);
if (transform != null)
{
animator = new TransformAnimator(transform);
}
}
if (animator == null)
{
throw new InvalidOperationException("The animation system could not be prepared for the target element.");
}
}
