/// <summary>
/// Runs a layout pass in the X direction, resolving edges that can be resolved.
/// </summary>
/// <param name="children">The children to resolve.</param>
/// <returns>true if all children have all X edges constrained, or false otherwise.</returns>
internal static bool RunPassX(this IEnumerable <RelativeLayoutResults> children)
{
bool done = true;
foreach (var child in children)
{
float width = child.EffectiveWidth;
EdgeStatus l = child.LeftEdge, r = child.RightEdge;
if (LockEdgeAnchor(l, r))
{
child.UseSizeDeltaX = true;
}
LockEdgeAnchor(l);
LockEdgeAnchor(r);
LockEdgeRelative(l, -width, r);
LockEdgeRelative(r, width, l);
// Lock to other components
if (child.LeftParams != null)
{
LockEdgeComponent(l, child.LeftParams.RightEdge);
}
if (child.RightParams != null)
{
LockEdgeComponent(r, child.RightParams.LeftEdge);
}
if (!l.Locked || !r.Locked)
{
done = false;
}
}
return(done);
}
/// <summary>
/// Runs a layout pass in the Y direction, resolving edges that can be resolved.
/// </summary>
/// <param name="children">The children to resolve.</param>
/// <returns>true if all children have all Y edges constrained, or false otherwise.</returns>
internal static bool RunPassY(this IEnumerable <RelativeLayoutResults> children)
{
bool done = true;
foreach (var child in children)
{
float height = child.EffectiveHeight;
EdgeStatus t = child.TopEdge, b = child.BottomEdge;
if (LockEdgeAnchor(t, b))
{
child.UseSizeDeltaY = true;
}
LockEdgeAnchor(b);
LockEdgeAnchor(t);
LockEdgeRelative(b, -height, t);
LockEdgeRelative(t, height, b);
// Lock to other components
if (child.BottomParams != null)
{
LockEdgeComponent(b, child.BottomParams.TopEdge);
}
if (child.TopParams != null)
{
LockEdgeComponent(t, child.TopParams.BottomEdge);
}
if (!t.Locked || !b.Locked)
{
done = false;
}
}
return(done);
}
/// <summary>
/// Executes the vertical layout.
/// </summary>
/// <param name="children">The components to lay out.</param>
/// <param name="scratch">The location where components will be temporarily stored.</param>
/// <param name="mBottom">The bottom margin.</param>
/// <param name="mTop">The top margin.</param>
internal static void ExecuteY(this IEnumerable <RelativeLayoutResults> children,
List <ILayoutController> scratch, float mBottom = 0.0f, float mTop = 0.0f)
{
foreach (var child in children)
{
var rt = child.Transform;
var insets = child.Insets;
EdgeStatus t = child.TopEdge, b = child.BottomEdge;
// Set corner positions
rt.anchorMin = new Vector2(rt.anchorMin.x, b.FromAnchor);
rt.anchorMax = new Vector2(rt.anchorMax.x, t.FromAnchor);
// If anchored by pivot, resize with current anchors
if (child.UseSizeDeltaY)
{
rt.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, child.
PreferredHeight);
}
else
{
// Bottom
rt.offsetMin = new Vector2(rt.offsetMin.x, b.Offset + insets.bottom +
(b.FromAnchor <= 0.0f ? mBottom : 0.0f));
// Top
rt.offsetMax = new Vector2(rt.offsetMax.x, t.Offset - insets.top -
(t.FromAnchor >= 1.0f ? mTop : 0.0f));
}
// Execute layout controllers if present
scratch.Clear();
rt.gameObject.GetComponents(scratch);
foreach (var component in scratch)
{
component.SetLayoutVertical();
}
}
}
/// <summary>
/// Executes the horizontal layout.
/// </summary>
/// <param name="children">The components to lay out.</param>
/// <param name="scratch">The location where components will be temporarily stored.</param>
/// <param name="mLeft">The left margin.</param>
/// <param name="mRight">The right margin.</param>
internal static void ExecuteX(this IEnumerable <RelativeLayoutResults> children,
List <ILayoutController> scratch, float mLeft = 0.0f, float mRight = 0.0f)
{
foreach (var child in children)
{
var rt = child.Transform;
var insets = child.Insets;
EdgeStatus l = child.LeftEdge, r = child.RightEdge;
// Set corner positions
rt.anchorMin = new Vector2(l.FromAnchor, 0.0f);
rt.anchorMax = new Vector2(r.FromAnchor, 1.0f);
// If anchored by pivot, resize with current anchors
if (child.UseSizeDeltaX)
{
rt.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, child.
PreferredWidth);
}
else
{
// Left
rt.offsetMin = new Vector2(l.Offset + insets.left + (l.FromAnchor <= 0.0f ?
mLeft : 0.0f), rt.offsetMin.y);
// Right
rt.offsetMax = new Vector2(r.Offset - insets.right - (r.FromAnchor >=
1.0f ? mRight : 0.0f), rt.offsetMax.y);
}
// Execute layout controllers if present
scratch.Clear();
rt.gameObject.GetComponents(scratch);
foreach (var component in scratch)
{
component.SetLayoutHorizontal();
}
}
}
/// <summary>
/// Locks an edge if it is constrained to an anchor.
/// </summary>
/// <param name="edge">The edge to check.</param>
private static void LockEdgeAnchor(EdgeStatus edge)
{
if (edge.Constraint == RelativeConstraintType.ToAnchor)
{
edge.Constraint = RelativeConstraintType.Locked;
edge.Offset = 0.0f;
}
}
/// <summary>
/// Locks an edge if it can be determined from another component.
/// </summary>
/// <param name="edge">The edge to check.</param>
/// <param name="offset">The component's offset in that direction.</param>
/// <param name="otherEdge">The opposing edge of the referenced component.</param>
private static void LockEdgeComponent(EdgeStatus edge, EdgeStatus otherEdge)
{
if (edge.Constraint == RelativeConstraintType.ToComponent && otherEdge.Locked)
{
edge.Constraint = RelativeConstraintType.Locked;
edge.FromAnchor = otherEdge.FromAnchor;
edge.Offset = otherEdge.Offset;
}
}
/// <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);
}
/// <summary>
/// Locks both edges if they are constrained to the same anchor.
/// </summary>
/// <param name="edge">The edge to check.</param>
/// <param name="otherEdge">The other edge to check.</param>
/// <returns>true if it was able to lock, or false otherwise.</returns>
private static bool LockEdgeAnchor(EdgeStatus edge, EdgeStatus otherEdge)
{
bool useDelta = edge.Constraint == RelativeConstraintType.ToAnchor && otherEdge.
Constraint == RelativeConstraintType.ToAnchor && edge.FromAnchor == otherEdge.
FromAnchor;
if (useDelta)
{
edge.Constraint = RelativeConstraintType.Locked;
otherEdge.Constraint = RelativeConstraintType.Locked;
edge.Offset = 0.0f;
otherEdge.Offset = 0.0f;
}
return(useDelta);
}
/// <summary>
/// Calculates the minimum size in the Y direction.
/// </summary>
/// <param name="children">The components to lay out.</param>
/// <returns>The minimum vertical size.</returns>
internal static float GetMinSizeY(this IEnumerable <RelativeLayoutResults> children)
{
float maxHeight = 0.0f, height;
foreach (var child in children)
{
var insets = child.Insets;
EdgeStatus bottom = child.BottomEdge, top = child.TopEdge;
float aMin = bottom.FromAnchor, aMax = top.FromAnchor;
if (aMax > aMin)
{
// "Elbow room" method
height = (child.EffectiveHeight + bottom.Offset - top.Offset) /
(aMax - aMin);
}
else
{
// Anchors are together
float oMin = bottom.Offset, oMax = top.Offset;
if (oMin == oMax)
{
oMin = oMax = child.EffectiveHeight * 0.5f;
}
if (oMin < 0.0f)
{
oMin /= -Math.Max(MIN_SIZE_RATIO, aMax);
}
else
{
oMin /= Math.Max(MIN_SIZE_RATIO, 1.0f - aMax);
}
if (oMax < 0.0f)
{
oMax /= -Math.Max(MIN_SIZE_RATIO, aMax);
}
else
{
oMax /= Math.Max(MIN_SIZE_RATIO, 1.0f - aMax);
}
height = Math.Max(oMin, oMax);
}
if (height > maxHeight)
{
maxHeight = height;
}
}
return(maxHeight);
}
/// <summary>
/// Calculates the minimum size in the X direction.
/// </summary>
/// <param name="children">The components to lay out.</param>
/// <returns>The minimum horizontal size.</returns>
internal static float GetMinSizeX(this IEnumerable <RelativeLayoutResults> children)
{
float maxWidth = 0.0f, width;
foreach (var child in children)
{
var insets = child.Insets;
EdgeStatus left = child.LeftEdge, right = child.RightEdge;
float aMin = left.FromAnchor, aMax = right.FromAnchor;
if (aMax > aMin)
{
// "Elbow room" method
width = (child.EffectiveWidth + left.Offset - right.Offset) /
(aMax - aMin);
}
else
{
// Anchors are together
float oMin = left.Offset, oMax = right.Offset;
if (oMin == oMax)
{
oMin = oMax = child.EffectiveWidth * 0.5f;
}
if (oMin < 0.0f)
{
oMin /= -Math.Max(MIN_SIZE_RATIO, aMax);
}
else
{
oMin /= Math.Max(MIN_SIZE_RATIO, 1.0f - aMax);
}
if (oMax < 0.0f)
{
oMax /= -Math.Max(MIN_SIZE_RATIO, aMax);
}
else
{
oMax /= Math.Max(MIN_SIZE_RATIO, 1.0f - aMax);
}
width = Math.Max(oMin, oMax);
}
if (width > maxWidth)
{
maxWidth = width;
}
}
return(maxWidth);
}
/// <summary>
/// Calculates the minimum size the component must be to support a specific child
/// component.
/// </summary>
/// <param name="min">The lower edge constraint.</param>
/// <param name="max">The upper edge constraint.</param>
/// <param name="effective">The component size in that dimension plus margins.</param>
/// <returns>The minimum parent component size to fit the child.</returns>
internal static float ElbowRoom(EdgeStatus min, EdgeStatus max, float effective)
{
float aMin = min.FromAnchor, aMax = max.FromAnchor, result, offMin = min.Offset,
offMax = max.Offset;
if (aMax > aMin)
{
// "Elbow room" method
result = (effective + offMin - offMax) / (aMax - aMin);
}
else
{
// Anchors are together
result = Math.Max(effective, Math.Max(Math.Abs(offMin), Math.Abs(offMax)));
}
return(result);
}
/// <summary>
/// Locks an edge if it can be determined from the other edge.
/// </summary>
/// <param name="edge">The edge to check.</param>
/// <param name="size">The component's effective size in that direction.</param>
/// <param name="opposing">The component's other edge.</param>
private static void LockEdgeRelative(EdgeStatus edge, float size, EdgeStatus opposing)
{
if (edge.Constraint == RelativeConstraintType.Unconstrained)
{
if (opposing.Locked)
{
edge.Constraint = RelativeConstraintType.Locked;
edge.FromAnchor = opposing.FromAnchor;
edge.Offset = opposing.Offset + size;
}
else if (opposing.Constraint == RelativeConstraintType.Unconstrained)
{
// Both unconstrained, full size
edge.Constraint = RelativeConstraintType.Locked;
edge.FromAnchor = 0.0f;
edge.Offset = 0.0f;
opposing.Constraint = RelativeConstraintType.Locked;
opposing.FromAnchor = 1.0f;
opposing.Offset = 0.0f;
}
}
}
/// <summary>
/// Calculates the minimum size the component must be to support a specific child
/// component.
/// </summary>
/// <param name="min">The lower edge constraint.</param>
/// <param name="max">The upper edge constraint.</param>
/// <param name="effective">The component size in that dimension plus margins.</param>
/// <returns>The minimum parent component size to fit the child.</returns>
internal static float ElbowRoom(EdgeStatus min, EdgeStatus max, float effective)
{
float aMin = min.FromAnchor, aMax = max.FromAnchor, result;
if (aMax > aMin)
{
// "Elbow room" method
result = (effective + min.Offset - max.Offset) / (aMax - aMin);
}
else
{
// Anchors are together
float oMin = min.Offset, oMax = max.Offset;
if (oMin == oMax)
{
oMin = oMax = effective * 0.5f;
}
if (oMin < 0.0f)
{
oMin /= -Math.Max(MIN_SIZE_RATIO, aMax);
}
else
{
oMin /= Math.Max(MIN_SIZE_RATIO, 1.0f - aMax);
}
if (oMax < 0.0f)
{
oMax /= -Math.Max(MIN_SIZE_RATIO, aMax);
}
else
{
oMax /= Math.Max(MIN_SIZE_RATIO, 1.0f - aMax);
}
result = Math.Max(oMin, oMax);
}
return(result);
}
