private void OrbitViewPanel_ItemArranged(object sender, OrbitViewPanelItemArrangedArgs e)
{
if (OrbitsEnabled)
{
_orbits.TryGetValue(e.ElementProperties.Element, out Ellipse orbit);
if (orbit == null)
{
if (_orbitsContainer == null)
{
_orbitsContainer = (Grid)GetTemplateChild("OrbitGrid");
if (_orbitsContainer == null)
{
return;
}
}
orbit = CreateOrbit();
_orbits.Add(e.ElementProperties.Element, orbit);
_orbitsContainer.Children.Add(orbit);
}
orbit.Height = orbit.Width = e.ElementProperties.DistanceFromCenter * 2;
}
}
/// <summary>
/// Provides the behavior for the "Arrange" pass of layout
/// </summary>
/// <param name="finalSize">The final area within the parent that this object should use to arrange itself and its children</param>
/// <returns>The actual size that is used after the element is arranged in layout.</returns>
protected override Size ArrangeOverride(Size finalSize)
{
var angle = 2 * Math.PI / Children.Count;
var minDistance = 80;
var maxDistance = Math.Max(minDistance, (Math.Min(finalSize.Width, finalSize.Height) - OrbitView.MaxItemSize) / 2);
var elementsProperties = new List <OrbitViewElementProperties>();
for (var i = 0; i < Children.Count; i++)
{
// UNO TODO
if (Children.ElementAt(i) is UIElement element)
{
OrbitViewDataItem orbitViewDataItem = null;
if (element is FrameworkElement)
{
orbitViewDataItem = ((FrameworkElement)element).DataContext as OrbitViewDataItem;
}
var d = orbitViewDataItem != null && orbitViewDataItem.Distance >= 0 ? orbitViewDataItem.Distance : 0.5;
d = Math.Min(d, 1d);
var distance = (d * (maxDistance - minDistance)) + minDistance;
var x = distance * Math.Cos((angle * i) + (angle / 2));
var y = distance * Math.Sin((angle * i) + (angle / 2));
var x_normalized = (finalSize.Width / 2) + x - (element.DesiredSize.Width / 2);
var y_normalized = (finalSize.Height / 2) - y - (element.DesiredSize.Height / 2);
var point = new Point(x_normalized, y_normalized);
element.Arrange(point.ToRect(element.DesiredSize));
var elementProperties = new OrbitViewElementProperties()
{
XYFromCenter = new Point(x, y),
DistanceFromCenter = distance,
Element = element
};
elementsProperties.Add(elementProperties);
if (ItemArranged != null)
{
var args = new OrbitViewPanelItemArrangedArgs()
{
ElementProperties = elementProperties,
ItemIndex = i
};
ItemArranged.Invoke(this, args);
}
}
}
ItemsArranged?.Invoke(this, new OrbitViewPanelItemsArrangedArgs()
{
Elements = elementsProperties
});
return(finalSize);
}