/// <summary>
/// Arranges the content of a <see cref="T:System.Windows.Controls.Decorator"/> element.
/// </summary>
/// <param name="arrangeSize">The <see cref="T:System.Windows.Size"/> this element uses to arrange its child content.</param>
/// <returns>
/// The <see cref="T:System.Windows.Size"/> that represents the arranged size of this <see cref="T:System.Windows.Controls.Decorator"/> element and its child.
/// </returns>
protected override Size ArrangeOverride(Size arrangeSize)
{
UIElement child = Child;
if (child != null)
{
double percent = AnimationProgress;
HorizontalRevealMode horizontalReveal = HorizontalReveal;
VerticalRevealMode verticalReveal = VerticalReveal;
double childWidth = child.DesiredSize.Width;
double childHeight = child.DesiredSize.Height;
if (this.UseDesiredSize)
{
double x = CalculateLeft(childWidth, percent, horizontalReveal);
double y = CalculateTop(childHeight, percent, verticalReveal);
child.Arrange(new Rect(x, y, childWidth, childHeight));
}
else
{
child.Arrange(new Rect(0, 0, arrangeSize.Width, arrangeSize.Height));
}
childWidth = child.RenderSize.Width;
childHeight = child.RenderSize.Height;
double width = CalculateWidth(childWidth, percent, horizontalReveal);
double height = CalculateHeight(childHeight, percent, verticalReveal);
return(new Size(width, height));
}
return(new Size());
}
/// <summary>
/// Calculates the width.
/// </summary>
/// <param name="originalWidth">Width of the original.</param>
/// <param name="percent">The percent.</param>
/// <param name="reveal">The reveal.</param>
/// <returns></returns>
private static double CalculateWidth(double originalWidth, double percent, HorizontalRevealMode reveal)
{
if (reveal == HorizontalRevealMode.None)
{
return(originalWidth);
}
return(originalWidth * percent);
}
/// <summary>
/// Calculates the left.
/// </summary>
/// <param name="width">The width.</param>
/// <param name="percent">The percent.</param>
/// <param name="reveal">The reveal.</param>
/// <returns></returns>
private static double CalculateLeft(double width, double percent, HorizontalRevealMode reveal)
{
if (reveal == HorizontalRevealMode.FromRightToLeft)
{
return((percent - 1.0) * width);
}
if (reveal == HorizontalRevealMode.FromCenterToEdge)
{
return((percent - 1.0) * width * 0.5);
}
return(0.0);
}
private static double CalculateWidth(double originalWidth, double percent, HorizontalRevealMode reveal)
{
if (reveal == HorizontalRevealMode.None)
{
return originalWidth;
}
else
{
return originalWidth * percent;
}
}
private static double CalculateLeft(double width, double percent, HorizontalRevealMode reveal)
{
if (reveal == HorizontalRevealMode.FromRightToLeft)
{
return (percent - 1.0) * width;
}
else if (reveal == HorizontalRevealMode.FromCenterToEdge)
{
return (percent - 1.0) * width * 0.5;
}
else
{
return 0.0;
}
}
