protected override Size ArrangeOverride(Size finalSize)
{
m_listener.StartListening();
// Calculate how many children fit on each row
int childrenPerRow = Math.Max(1, (int)Math.Floor(finalSize.Width / this.ItemWidth));
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
Point newOffset = calculateChildOffset(i, childrenPerRow,
this.ItemWidth, this.ItemHeight,
finalSize.Width, this.Children.Count);
AnimatingTilePanelData data = (AnimatingTilePanelData)child.GetValue(DataProperty);
if (data == null)
{
data = new AnimatingTilePanelData();
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;
}
data.ChildLocation = newOffset;
child.Arrange(new Rect(newOffset, theChildSize));
}
else
{
Point currentOffset = data.ChildLocation;
// Position the child and set its size
child.Arrange(new Rect(currentOffset, theChildSize));
}
}
return(finalSize);
}
private static bool updateElement(AnimatingTilePanelData data, double dampening, double attractionFactor, double variation)
{
Debug.Assert(dampening > 0 && dampening < 1);
Debug.Assert(attractionFactor > 0 && !double.IsInfinity(attractionFactor));
attractionFactor *= 1 + (variation * data.Random - .5);
Point newLocation;
Vector newVelocity;
bool anythingChanged =
WpfUtil.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);
}
private static bool updateElement(AnimatingTilePanelData data, double dampening, double attractionFactor, double variation)
{
Debug.Assert(dampening > 0 && dampening < 1);
Debug.Assert(attractionFactor > 0 && !double.IsInfinity(attractionFactor));
attractionFactor *= 1 + (variation * data.Random - .5);
Point newLocation;
Vector newVelocity;
bool anythingChanged =
WpfUtil.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)
{
m_listener.StartListening();
// Calculate how many children fit on each row
int childrenPerRow = Math.Max(1, (int)Math.Floor(finalSize.Width / this.ItemWidth));
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
Point newOffset = calculateChildOffset(i, childrenPerRow,
this.ItemWidth, this.ItemHeight,
finalSize.Width, this.Children.Count);
AnimatingTilePanelData data = (AnimatingTilePanelData)child.GetValue(DataProperty);
if (data == null)
{
data = new AnimatingTilePanelData();
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;
}
data.ChildLocation = newOffset;
child.Arrange(new Rect(newOffset, theChildSize));
}
else
{
Point currentOffset = data.ChildLocation;
// Position the child and set its size
child.Arrange(new Rect(currentOffset, theChildSize));
}
}
return finalSize;
}
