/// <summary>
/// Attach the translate transform that is used
/// for the slide in effect to a framework element.
/// </summary>
/// <param name="element">The framework element.</param>
private static void AttachTransform(FrameworkElement element)
{
Transform originalTransform = element.RenderTransform;
TranslateTransform translateTransform = SlideInEffect.GetAttachedTransform(element);
if (translateTransform == null)
{
translateTransform = new TranslateTransform()
{
X = 0
};
if (originalTransform == null)
{
element.RenderTransform = translateTransform;
}
else
{
TransformGroup transformGroup = new TransformGroup();
transformGroup.Children.Add(originalTransform);
transformGroup.Children.Add(translateTransform);
element.RenderTransform = transformGroup;
}
SlideInEffect.SetAttachedTransform(element, translateTransform);
}
}
/// <summary>
/// Unsubscribes an element from the private managers.
/// </summary>
/// <param name="target">The framework element.</param>
private static void UnsubscribeFrameworkElement(FrameworkElement target)
{
// If element is subscribed, unsubscribe.
if (SlideInEffect.GetIsSubscribed(target))
{
SlideInEffect.SetParentPivot(target, null);
SlideInEffect.SetParentPivotItem(target, null);
SlideInEffect.SetIsSubscribed(target, false);
}
}
/// <summary>
/// Subscribes an element to the private managers.
/// </summary>
/// <param name="target">The framework element.</param>
private static void SubscribeFrameworkElement(FrameworkElement target)
{
if (!SlideInEffect.GetIsSubscribed(target))
{
// Find the parent Pivot and PivotItem.
Pivot pivot, pTemp;
PivotItem pivotItem, iTemp;
DependencyObject parent = VisualTreeHelper.GetParent(target);
pTemp = null;
pivotItem = iTemp = null;
while ((pTemp == null) && (parent != null))
{
pTemp = parent as Pivot;
iTemp = parent as PivotItem;
if (iTemp != null)
{
pivotItem = iTemp;
}
parent = VisualTreeHelper.GetParent(parent as DependencyObject);
}
if (parent == null || pivotItem == null)
{
return;
}
else
{
pivot = pTemp;
}
AttachTransform(target);
SlideInEffect.SetParentPivot(target, pivot);
SlideInEffect.SetParentPivotItem(target, pivotItem);
SlideInEffect.SetIsSubscribed(target, true);
}
}
/// <summary>
/// Adds an animation corresponding to an specific framework element.
/// Thus, the storyboard can be composed piece by piece.
/// </summary>
/// <param name="element">The framework element.</param>
/// <param name="leftToRight">
/// Indicates whether the animation should go
/// from left to right or viceversa.
/// </param>
/// <param name="storyboard">A reference to the storyboard.</param>
private static void ComposeStoryboard(FrameworkElement element, bool leftToRight, ref Storyboard storyboard)
{
double xPosition = SlideInEffect.GetLineIndex(element) * ProportionalOffset;
double from = leftToRight ? xPosition : -xPosition;
TranslateTransform translateTransform = SlideInEffect.GetAttachedTransform(element);
DoubleAnimationUsingKeyFrames animation = new DoubleAnimationUsingKeyFrames();
LinearDoubleKeyFrame keyFrame1 = new LinearDoubleKeyFrame();
keyFrame1.KeyTime = TimeSpan.Zero;
keyFrame1.Value = from;
animation.KeyFrames.Add(keyFrame1);
LinearDoubleKeyFrame keyFrame2 = new LinearDoubleKeyFrame();
keyFrame2.KeyTime = TimeSpan.FromMilliseconds(BeginTime);
keyFrame2.Value = from;
animation.KeyFrames.Add(keyFrame2);
LinearDoubleKeyFrame keyFrame3 = new LinearDoubleKeyFrame();
keyFrame3.KeyTime = TimeSpan.FromMilliseconds(BreakTime);
keyFrame3.Value = from * ExponentialInterpolationWeight;
animation.KeyFrames.Add(keyFrame3);
EasingDoubleKeyFrame keyFrame4 = new EasingDoubleKeyFrame();
keyFrame4.KeyTime = TimeSpan.FromMilliseconds(EndTime);
keyFrame4.Value = 0.0;
keyFrame4.EasingFunction = SlideInExponentialEase;
animation.KeyFrames.Add(keyFrame4);
Storyboard.SetTarget(animation, translateTransform);
Storyboard.SetTargetProperty(animation, XPropertyPath);
storyboard.Children.Add(animation);
}
/// <summary>
/// Modify the subscription of the dependency object
/// to the private managers based on the line index value.
/// </summary>
/// <param name="obj">The dependency object.</param>
/// <param name="e">The event arguments.</param>
private static void OnLineIndexPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
FrameworkElement target = obj as FrameworkElement;
if (target == null)
{
throw new InvalidOperationException("The dependency object must be a framework element.");
}
int index = (int)e.NewValue;
if (index < 0)
{
// Dettach event handlers.
if (SlideInEffect.GetHasEventsAttached(target))
{
target.Loaded -= Target_Loaded;
target.Unloaded -= Target_Unloaded;
SlideInEffect.SetHasEventsAttached(target, false);
}
UnsubscribeFrameworkElement(target);
}
else
{
// Attach event handlers.
if (!SlideInEffect.GetHasEventsAttached(target))
{
target.Loaded += Target_Loaded;
target.Unloaded += Target_Unloaded;
SlideInEffect.SetHasEventsAttached(target, true);
}
SubscribeFrameworkElement(target);
}
}
