/// <summary>
/// Initializes and computes horizontal sizes for the components in this relative
/// layout.
/// </summary>
/// <param name="children">The location to store information about these components.</param>
/// <param name="all">The components to lay out.</param>
/// <param name="constraints">The constraints defined for these components.</param>
internal static void CalcX(this ICollection <RelativeLayoutResults> children,
RectTransform all, IDictionary <GameObject, RelativeLayoutParams> constraints)
{
var comps = ListPool <Component, RelativeLayoutGroup> .Allocate();
var paramMap = DictionaryPool <GameObject, RelativeLayoutResults,
RelativeLayoutGroup> .Allocate();
int n = all.childCount;
children.Clear();
for (int i = 0; i < n; i++)
{
var child = all.GetChild(i)?.gameObject;
if (child != null)
{
comps.Clear();
// Calculate the preferred size using all layout components
child.GetComponents(comps);
var horiz = PUIUtils.CalcSizes(child, PanelDirection.Horizontal, comps);
if (!horiz.ignore)
{
RelativeLayoutResults ip;
float w = horiz.preferred;
if (constraints.TryGetValue(child, out RelativeLayoutParams cons))
{
ip = new RelativeLayoutResults(child.rectTransform(), cons);
// Set override size by axis if necessary
var overrideSize = ip.OverrideSize;
if (overrideSize.x > 0.0f)
{
w = overrideSize.x;
}
paramMap[child] = ip;
}
else
{
// Default its layout to fill all
ip = new RelativeLayoutResults(child.rectTransform(), null);
}
ip.PreferredWidth = w;
children.Add(ip);
}
}
}
// Resolve object references to other children
foreach (var ip in children)
{
ip.TopParams = InitResolve(ip.TopEdge, paramMap);
ip.BottomParams = InitResolve(ip.BottomEdge, paramMap);
ip.LeftParams = InitResolve(ip.LeftEdge, paramMap);
ip.RightParams = InitResolve(ip.RightEdge, paramMap);
// All of these will die simultaneously when the list is recycled
}
paramMap.Recycle();
comps.Recycle();
}
/// <summary>
/// Resolves a component reference if needed.
/// </summary>
/// <param name="edge">The edge to resolve.</param>
/// <param name="lookup">The location where the component can be looked up.</param>
/// <returns>The linked parameters for that edge if needed.</returns>
private static RelativeLayoutResults InitResolve(EdgeStatus edge,
IDictionary <GameObject, RelativeLayoutResults> lookup)
{
RelativeLayoutResults result = null;
if (edge.Constraint == RelativeConstraintType.ToComponent)
{
if (!lookup.TryGetValue(edge.FromComponent, out result))
{
edge.Constraint = RelativeConstraintType.Unconstrained;
}
}
return(result);
}