private static bool updateElement(AnimatingFillPanelData data, double dampening, double attractionFactor, double variation)
{
Debug.Assert(dampening > 0 && dampening < 1);
Debug.Assert(attractionFactor > 0 && !double.IsInfinity(attractionFactor));
if (data == null)
return false;
attractionFactor *= 1 + (variation * data.Random - .5);
Point newLocation;
Vector newVelocity;
bool anythingChanged =
Animate(data.ChildLocation, data.Velocity, data.ChildTarget,
attractionFactor, dampening, c_terminalVelocity, c_diff, c_diff,
out newLocation, out newVelocity);
data.ChildLocation = newLocation;
data.Velocity = newVelocity;
return anythingChanged;
}
protected override Size ArrangeOverride(Size finalSize)
{
bool animateNewItem = AnimatesNewItem && m_hasArranged;
m_hasArranged = true;
//Size theChildSize = new Size(this.ItemWidth, this.ItemHeight);
for (int i = 0; i < this.Children.Count; i++)
{
UIElement child = this.Children[i];
// Figure out where the child goes
Rect rect = GetFillData(child);
Point newOffset = rect.Location();
AnimatingFillPanelData data = (AnimatingFillPanelData)child.GetValue(DataProperty);
if (data == null)
{
data = new AnimatingFillPanelData();
child.SetValue(DataProperty, data);
}
//set the location attached DP
data.ChildTarget = newOffset;
if (data.IsNew) // first time I've seen this...
{
data.IsNew = false;
if (animateNewItem)
{
//newOffset.X -= theChildSize.Width;
newOffset.Y = finalSize.Height;
newOffset.X = finalSize.Width / 2;
}
data.ChildLocation = newOffset;
child.Arrange(new Rect(newOffset.X, newOffset.Y, child.DesiredSize.Width, child.DesiredSize.Height));
}
else
{
Point currentOffset = data.ChildLocation;
// Position the child and set its size
child.Arrange(new Rect(currentOffset.X, currentOffset.Y, child.DesiredSize.Width, child.DesiredSize.Height));
}
}
return finalSize;
}
