/// <summary>
/// Lays out components in the box layout container parallel to the layout axis.
/// </summary>
/// <param name="required">The calculated minimum and preferred sizes.</param>
/// <param name="args">The parameters to use for layout.</param>
/// <param name="status">The current status of layout.</param>
private static void DoLayoutLinear(BoxLayoutResults required, BoxLayoutParams args,
BoxLayoutStatus status)
{
var total = required.total;
var components = ListPool <ILayoutController, BoxLayoutGroup> .Allocate();
var direction = args.Direction;
// Determine flex size ratio
float size = status.size, prefRatio = 0.0f, minSize = total.min, prefSize =
total.preferred, excess = Math.Max(0.0f, size - prefSize), flexTotal = total.
flexible, offset = status.offset, spacing = args.Spacing;
if (size > minSize && prefSize > minSize)
{
// Do not divide by 0
prefRatio = Math.Min(1.0f, (size - minSize) / (prefSize - minSize));
}
if (excess > 0.0f && flexTotal == 0.0f)
{
// If no components can be expanded, offset all
offset += PUIUtils.GetOffset(args.Alignment, status.direction, excess);
}
foreach (var child in required.children)
{
var obj = child.source;
// Active objects only
if (obj != null && obj.activeInHierarchy)
{
float compSize = child.min;
if (prefRatio > 0.0f)
{
compSize += (child.preferred - child.min) * prefRatio;
}
if (excess > 0.0f && flexTotal > 0.0f)
{
compSize += excess * child.flexible / flexTotal;
}
// Place and size component
obj.AddOrGet <RectTransform>().SetInsetAndSizeFromParentEdge(status.edge,
offset, compSize);
offset += compSize + ((compSize > 0.0f) ? spacing : 0.0f);
// Invoke SetLayout on dependents
components.Clear();
obj.GetComponents(components);
foreach (var component in components)
{
if (direction == PanelDirection.Horizontal)
{
component.SetLayoutHorizontal();
}
else // if (direction == PanelDirection.Vertical)
{
component.SetLayoutVertical();
}
}
}
}
components.Recycle();
}
/// <summary>
/// Lays out components in the box layout container.
/// </summary>
/// <param name="args">The parameters to use for layout.</param>
/// <param name="required">The calculated minimum and preferred sizes.</param>
/// <param name="size">The total available size in this dimension.</param>
private static void DoLayout(BoxLayoutParams args, BoxLayoutResults required,
float size)
{
if (required == null)
{
throw new ArgumentNullException(nameof(required));
}
var direction = required.direction;
var status = new BoxLayoutStatus(direction, args.Margin ?? new RectOffset(), size);
if (args.Direction == direction)
{
DoLayoutLinear(required, args, status);
}
else
{
DoLayoutPerp(required, args, status);
}
}
/// <summary>
/// Lays out components in the box layout container against the layout axis.
/// </summary>
/// <param name="required">The calculated minimum and preferred sizes.</param>
/// <param name="args">The parameters to use for layout.</param>
/// <param name="status">The current status of layout.</param>
private static void DoLayoutPerp(BoxLayoutResults required, BoxLayoutParams args,
BoxLayoutStatus status)
{
var components = ListPool <ILayoutController, BoxLayoutGroup> .Allocate();
var direction = args.Direction;
float size = status.size;
foreach (var child in required.children)
{
var obj = child.source;
// Active objects only
if (obj != null && obj.activeInHierarchy)
{
float compSize = size;
if (child.flexible <= 0.0f)
{
// Does not expand to all
compSize = Math.Min(compSize, child.preferred);
}
float offset = (size > compSize) ? PUIUtils.GetOffset(args.Alignment,
status.direction, size - compSize) : 0.0f;
// Place and size component
obj.AddOrGet <RectTransform>().SetInsetAndSizeFromParentEdge(status.edge,
offset + status.offset, compSize);
// Invoke SetLayout on dependents
components.Clear();
obj.GetComponents(components);
foreach (var component in components)
{
if (direction == PanelDirection.Horizontal)
{
component.SetLayoutVertical();
}
else // if (direction == PanelDirection.Vertical)
{
component.SetLayoutHorizontal();
}
}
}
}
components.Recycle();
}
