public abstract Rect GetInitialChildPlacement(
UIElement child,
Rect currentPlacement,
Rect targetPlacement,
AnimationPanel activeLayout,
ref AnimationRate animationRate,
out object placementArgs,
out bool isDone);
public abstract Rect GetNextChildPlacement(
UIElement child,
TimeSpan currentTime,
Rect currentPlacement,
Rect targetPlacement,
AnimationPanel activeLayout,
AnimationRate animationRate,
ref object placementArgs,
out bool isDone);
public override Rect GetInitialChildPlacement( UIElement child, Rect currentPlacement,
Rect targetPlacement, AnimationPanel activeLayout, ref AnimationRate animationRate,
out object placementArgs, out bool isDone)
{
isDone = ( animationRate.HasSpeed && animationRate.Speed <= 0 ) || ( animationRate.HasDuration && animationRate.Duration.Ticks == 0 );
if( !isDone )
{
Vector startVector = new Vector( currentPlacement.Left + ( currentPlacement.Width / 2 ), currentPlacement.Top + ( currentPlacement.Height / 2 ) );
Vector finalVector = new Vector( targetPlacement.Left + ( targetPlacement.Width / 2 ), targetPlacement.Top + ( targetPlacement.Height / 2 ) );
Vector distanceVector = startVector - finalVector;
animationRate = new AnimationRate( animationRate.HasDuration ? animationRate.Duration
: TimeSpan.FromMilliseconds( distanceVector.Length / animationRate.Speed ) );
}
placementArgs = currentPlacement;
return currentPlacement;
}
public override Rect GetNextChildPlacement( UIElement child, TimeSpan currentTime,
Rect currentPlacement, Rect targetPlacement, AnimationPanel activeLayout,
AnimationRate animationRate, ref object placementArgs, out bool isDone)
{
Rect result = targetPlacement;
isDone = true;
if( _equation != null )
{
Rect from = ( Rect )placementArgs;
TimeSpan duration = animationRate.Duration;
isDone = currentTime >= duration;
if( !isDone )
{
double x = _equation.Evaluate( currentTime, from.Left, targetPlacement.Left, duration );
double y = _equation.Evaluate( currentTime, from.Top, targetPlacement.Top, duration );
double width = Math.Max( 0, _equation.Evaluate( currentTime, from.Width, targetPlacement.Width, duration ) );
double height = Math.Max( 0, _equation.Evaluate( currentTime, from.Height, targetPlacement.Height, duration ) );
result = new Rect( x, y, width, height );
}
}
return result;
}
public override Rect GetNextChildPlacement( UIElement child, TimeSpan currentTime, Rect currentPlacement, Rect targetPlacement, AnimationPanel activeLayout, AnimationRate animationRate, ref object placementArgs, out bool isDone )
{
throw new InvalidOperationException( ErrorMessages.GetMessage( ErrorMessages.DefaultAnimatorCantAnimate ) );
}
internal static UIElement FindAncestorChildOfAnimationPanel( DependencyObject element, out AnimationPanel panel )
{
panel = null;
if( element == null )
return null;
DependencyObject parent = VisualTreeHelper.GetParent( element );
if( parent == null )
return null;
if( parent is AnimationPanel || parent is SwitchPanel )
{
panel = ( parent is SwitchPanel )
? ( parent as SwitchPanel )._currentLayoutPanel
: parent as AnimationPanel;
return element as UIElement;
}
return AnimationPanel.FindAncestorChildOfAnimationPanel( parent, out panel );
}
