private Storyboard CreateEnterAnimation(Panel layoutRoot)
{
var enterAnimation = new Storyboard();
Storyboard.SetTarget(enterAnimation, layoutRoot);
var ad = new AnimationDescription(AnimationEffect.EnterPage, AnimationEffectTarget.Primary);
for (int i = 0; i < layoutRoot.Children.Count; i++)
{
// Add a render transform to the existing one just for animations
var element = layoutRoot.Children[i];
var tg = new TransformGroup();
tg.Children.Add(new TranslateTransform());
tg.Children.Add(element.RenderTransform);
element.RenderTransform = tg;
// Calculate the stagger for each animation. Note that this has a max
var delayMs = Math.Min(ad.StaggerDelay.TotalMilliseconds * i * ad.StaggerDelayFactor, ad.DelayLimit.Milliseconds);
var delay = TimeSpan.FromMilliseconds(delayMs);
foreach (var description in ad.Animations)
{
var animation = new DoubleAnimationUsingKeyFrames();
// Start the animation at the right offset
var startSpline = new SplineDoubleKeyFrame();
startSpline.KeyTime = TimeSpan.FromMilliseconds(0);
Storyboard.SetTarget(animation, element);
// Hold at that offset until the stagger delay is hit
var middleSpline = new SplineDoubleKeyFrame();
middleSpline.KeyTime = delay;
// Animation from delayed time to last time
var endSpline = new SplineDoubleKeyFrame();
endSpline.KeySpline = new KeySpline() { ControlPoint1 = description.Control1, ControlPoint2 = description.Control2 };
endSpline.KeyTime = description.Duration + delay;
// Do the translation
if (description.Type == PropertyAnimationType.Translation)
{
startSpline.Value = ANIMATION_TRANSLATION_START;
middleSpline.Value = ANIMATION_TRANSLATION_START;
endSpline.Value = ANIMATION_TRANSLATION_END;
Storyboard.SetTargetProperty(animation, "(UIElement.RenderTransform).(TransformGroup.Children)[0].X");
}
// Opacity
else if (description.Type == PropertyAnimationType.Opacity)
{
startSpline.Value = ANIMATION_OPACITY_START;
middleSpline.Value = ANIMATION_OPACITY_START;
endSpline.Value = ANIMATION_OPACITY_END;
Storyboard.SetTargetProperty(animation, "Opacity");
}
else
{
throw new Exception("Encountered an unexpected animation type.");
}
// Put the final animation together
animation.KeyFrames.Add(startSpline);
animation.KeyFrames.Add(middleSpline);
animation.KeyFrames.Add(endSpline);
enterAnimation.Children.Add(animation);
}
}
return enterAnimation;
}
/// <summary>
/// Retrieves the specified metrics and displays them in textual form.
/// </summary>
/// <param name="effect">The AnimationEffect whose metrics are to be displayed.</param>
/// <param name="target">The AnimationEffecTarget whose metrics are to be displayed.</param>
private void DisplayMetrics(AnimationEffect effect, AnimationEffectTarget target)
{
var s = new System.Text.StringBuilder();
AnimationDescription animationDescription = new AnimationDescription(effect, target);
s.AppendFormat("Stagger delay = {0}ms", animationDescription.StaggerDelay.TotalMilliseconds);
s.AppendLine();
s.AppendFormat("Stagger delay factor = {0}", animationDescription.StaggerDelayFactor);
s.AppendLine();
s.AppendFormat("Delay limit = {0}ms", animationDescription.DelayLimit.TotalMilliseconds);
s.AppendLine();
s.AppendFormat("ZOrder = {0}", animationDescription.ZOrder);
s.AppendLine();
s.AppendLine();
int animationIndex = 0;
foreach (var animation in animationDescription.Animations)
{
s.AppendFormat("Animation #{0}:", ++animationIndex);
s.AppendLine();
switch (animation.Type)
{
case PropertyAnimationType.Scale:
{
ScaleAnimation scale = animation as ScaleAnimation;
s.AppendLine("Type = Scale");
if (scale.InitialScaleX.HasValue)
{
s.AppendFormat("InitialScaleX = {0}", scale.InitialScaleX.Value);
s.AppendLine();
}
if (scale.InitialScaleY.HasValue)
{
s.AppendFormat("InitialScaleY = {0}", scale.InitialScaleY.Value);
s.AppendLine();
}
s.AppendFormat("FinalScaleX = {0}", scale.FinalScaleX);
s.AppendLine();
s.AppendFormat("FinalScaleY = {0}", scale.FinalScaleY);
s.AppendLine();
s.AppendFormat("Origin = {0}, {1}", scale.NormalizedOrigin.X, scale.NormalizedOrigin.Y);
s.AppendLine();
}
break;
case PropertyAnimationType.Translation:
s.AppendLine("Type = Translation");
break;
case PropertyAnimationType.Opacity:
{
OpacityAnimation opacity = animation as OpacityAnimation;
s.AppendLine("Type = Opacity");
if (opacity.InitialOpacity.HasValue)
{
s.AppendFormat("InitialOpacity = {0}", opacity.InitialOpacity.Value);
s.AppendLine();
}
s.AppendFormat("FinalOpacity = {0}", opacity.FinalOpacity);
s.AppendLine();
}
break;
}
s.AppendFormat("Delay = {0}ms", animation.Delay.TotalMilliseconds);
s.AppendLine();
s.AppendFormat("Duration = {0}ms", animation.Duration.TotalMilliseconds);
s.AppendLine();
s.AppendFormat("Cubic Bezier control points");
s.AppendLine();
s.AppendFormat(" X1 = {0}, Y1 = {1}", animation.Control1.X, animation.Control1.Y);
s.AppendLine();
s.AppendFormat(" X2 = {0}, Y2 = {1}", animation.Control2.X, animation.Control2.Y);
s.AppendLine();
s.AppendLine();
}
Metrics.Text = s.ToString();
}