private static void SeedChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
if (obj is RandomPanel)
{
RandomPanel owner = (RandomPanel)obj;
owner._random = new Random((int)args.NewValue);
owner.InvalidateArrange();
}
}
private static void OnInvalidateMeasure(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RandomPanel panel = d as RandomPanel;
if (panel.MinimumWidth > panel.MaximumWidth)
{
throw new InvalidDataException("MinWidth can't be greater than MaxWidth.");
}
else if (panel.MinimumHeight > panel.MaximumHeight)
{
throw new InvalidDataException("MinHeight can't be greater than MaxHeight.");
}
else
{
((AnimationPanel)d).InvalidateMeasure();
}
}
protected override Size MeasureChildrenOverride(UIElementCollection children, Size constraint)
{
Size availableSize = new Size(double.PositiveInfinity, double.PositiveInfinity);
foreach (UIElement child in children)
{
if (child == null)
{
continue;
}
Size childSize = new Size(1d * _random.Next(Convert.ToInt32(MinimumWidth), Convert.ToInt32(MaximumWidth)),
1d * _random.Next(Convert.ToInt32(MinimumHeight), Convert.ToInt32(MaximumHeight)));
child.Measure(childSize);
RandomPanel.SetActualSize(child, childSize);
}
return(new Size());
}
protected override Size ArrangeChildrenOverride(UIElementCollection children, Size finalSize)
{
foreach (UIElement child in children)
{
if (child == null)
{
continue;
}
Size childSize = RandomPanel.GetActualSize(child);
double x = _random.Next(0, (int)(Math.Max(finalSize.Width - childSize.Width, 0)));
double y = _random.Next(0, (int)(Math.Max(finalSize.Height - childSize.Height, 0)));
double width = Math.Min(finalSize.Width, childSize.Width);
double height = Math.Min(finalSize.Height, childSize.Height);
this.ArrangeChild(child, new Rect(new Point(x, y), new Size(width, height)));
}
return(finalSize);
}