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using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Media.Animation;
using System.Windows;
namespace Tango.SharedUI.Animations
{
public class GridLengthAnimation : AnimationTimeline
{
public static readonly DependencyProperty FromProperty;
public static readonly DependencyProperty ToProperty;
static GridLengthAnimation()
{
FromProperty = DependencyProperty.Register("From", typeof(GridLength), typeof(GridLengthAnimation));
ToProperty = DependencyProperty.Register("To", typeof(GridLength), typeof(GridLengthAnimation));
}
protected override Freezable CreateInstanceCore()
{
return new GridLengthAnimation();
}
public override Type TargetPropertyType
{
get { return typeof(GridLength); }
}
public GridLength From
{
get
{
return (GridLength)GetValue(GridLengthAnimation.FromProperty);
}
set
{
SetValue(GridLengthAnimation.FromProperty, value);
}
}
public GridLength To
{
get
{
return (GridLength)GetValue(GridLengthAnimation.ToProperty);
}
set
{
SetValue(GridLengthAnimation.ToProperty, value);
}
}
public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock)
{
double fromValue = ((GridLength)GetValue(GridLengthAnimation.FromProperty)).Value;
double toValue = ((GridLength)GetValue(GridLengthAnimation.ToProperty)).Value;
if (fromValue > toValue)
{
return new GridLength((1 - animationClock.CurrentProgress.Value) * (fromValue - toValue) + toValue, this.To.IsStar ? GridUnitType.Star : GridUnitType.Pixel);
}
else
{
return new GridLength((animationClock.CurrentProgress.Value) * (toValue - fromValue) + fromValue, this.To.IsStar ? GridUnitType.Star : GridUnitType.Pixel);
}
}
}
}
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