internal static void AlignChildren(this CogaNode node)
{
if (node.Compute.Position.IsResolved() == false)
{
return;
}
switch (node.NodeConfiguration.Alignment)
{
case CogaAlign.Default:
AlignFlexStart(node);
break;
case CogaAlign.FlexStart:
AlignFlexStart(node);
break;
case CogaAlign.FlexEnd:
AlignFlexEnd(node);
break;
case CogaAlign.Center:
AlignCenter(node);
break;
default:
AlignFlexStart(node);
break;
}
}
internal static void LayoutChildren(this CogaNode node)
{
if (node.NeedsLayout == false || node.GetIsActive() == false || node.Children == null || node.Children.Count == 0)
{
node.TriggerLayout();
return;
}
node.RowLayout.Refresh();
StandardLayoutJustification.JustifyChildren(node);
StandardLayoutAlignment.AlignChildren(node);
foreach (var c in node.Children)
{
if (c.GetIsActive() == false)
{
continue;
}
if (c.NodeConfiguration.Layout == CogaLayout.Absolute)
{
c.CalculateAbsolutePositioning();
}
c.LayoutChildren();
c.TriggerLayout();
}
node.NeedsLayout = false;
}
static void CalculateHeight(CogaNode node)
{
if (node.GetIsRoot())
{
node.Compute.Size.Y.Complete(node.NodeConfiguration.Height.Value);
return;
}
switch (node.NodeConfiguration.Height.ValueType)
{
// Flat pixel amounts are just passed through.
case CogaValueMode.Pixel:
node.Compute.Size.Y.Complete(node.NodeConfiguration.Height.Value);
break;
case CogaValueMode.Default:
var pref = node.PreferredNodeSize();
if (pref.HasValue)
{
node.Compute.Size.Y.Complete(pref.Value.Y);
}
else
{
node.Compute.Size.Y.Complete(node.MinimumNodeSize().Y);
}
break;
case CogaValueMode.Fill:
node.Compute.Size.Y.Complete(node.MinimumNodeSize().Y);
break;
}
}
static void AlignFlexStart(CogaNode node)
{
for (int y = 0; y < node.RowLayout.Rows.Count; y++)
{
var real_index = (node.RowLayout.Rows.Count - 1) - y; // Reverse accessor index.
var row = node.RowLayout.Rows[y];
var totalChildrenInRow = row.Children.Count;
var cumulative_height = node.RowLayout.CumulativeHeights[y];
var spacing = y * node.NodeConfiguration.Spacing;
for (int x = 0; x < totalChildrenInRow; x++)
{
var child = row.Children[x];
if (child.NodeConfiguration.Layout == CogaLayout.Absolute)
{
continue;
}
var offset = 0f;
if (node.ComputedPadding.ContainsKey(Edge.Top))
{
offset = node.ComputedPadding[Edge.Top].Value;
}
child.Compute.Position.Y.Complete(offset + node.Compute.Y + cumulative_height + spacing);
}
}
}
internal static void CalculatePadding(this CogaNode node)
{
// Conveniently compute the node edges without repeating code over and over.
void AttemptCalculatePadding(Edge e)
{
switch (node.NodeConfiguration.Padding[e].ValueType)
{
case CogaValueMode.Pixel:
node.ComputedPadding[e].Complete(node.NodeConfiguration.Padding[e].Value);
break;
}
}
AttemptCalculatePadding(Edge.Left);
AttemptCalculatePadding(Edge.Top);
AttemptCalculatePadding(Edge.Right);
AttemptCalculatePadding(Edge.Bottom);
// Resolve convenience edges.
if (node.ComputedPadding[Edge.Top].Resolved || node.ComputedPadding[Edge.Bottom].Resolved)
{
var top = node.ComputedPadding.ContainsKey(Edge.Top) ? node.ComputedPadding[Edge.Bottom].Value : 0f;
var bottom = node.ComputedPadding.ContainsKey(Edge.Right) ? node.ComputedPadding[Edge.Right].Value : 0f;
node.ComputedPadding[Edge.Vertical].Complete(top + bottom);
}
if (node.ComputedPadding[Edge.Left].Resolved || node.ComputedPadding[Edge.Right].Resolved)
{
var left = node.ComputedPadding.ContainsKey(Edge.Left) ? node.ComputedPadding[Edge.Left].Value : 0f;
var right = node.ComputedPadding.ContainsKey(Edge.Right) ? node.ComputedPadding[Edge.Right].Value : 0f;
node.ComputedPadding[Edge.Horizontal].Complete(left + right);
}
}
static void JustifyFlexEnd(CogaNode node)
{
JustifyFlexStart(node);
foreach (var row in node.RowLayout.Rows)
{
if (row.RemainingWidth > 0f)
{
foreach (var child in row.Children)
{
child.Compute.Position.X.Complete(child.Compute.X + row.RemainingWidth);
}
}
}
}
static void JustifyFlexStart(CogaNode node)
{
for (int y = 0; y < node.RowLayout.Rows.Count; y++)
{
var sum = 0f;
var row = node.RowLayout.Rows[y];
for (int x = 0; x < row.Children.Count; x++)
{
var child = row.Children[x];
if (child.NodeConfiguration.Layout == CogaLayout.Absolute)
{
continue;
}
child.Compute.Position.X.Complete(node.Compute.X + node.ComputedPadding[Edge.Left].Value + sum);
sum += child.Compute.Width + node.NodeConfiguration.Spacing;
}
}
}
static void AlignCenter(CogaNode node)
{
AlignFlexStart(node);
var offset = node.RowLayout.RemainingHeight * 0.5f;
for (int y = 0; y < node.RowLayout.Rows.Count; y++)
{
var row = node.RowLayout.Rows[y];
for (int x = 0; x < row.Children.Count; x++)
{
var child = row.Children[x];
if (child.NodeConfiguration.Layout == CogaLayout.Absolute)
{
continue;
}
child.Compute.Position.Y.Complete(child.Compute.Y + offset);
}
}
}
internal static void CalculateAbsolutePositioning(this CogaNode node)
{
if (node.Parent == null)
{
return;
}
// Calculate the left and right absolute positioning.
if (node.NodeConfiguration.Left.ValueType != CogaValueMode.Undefined)
{
node.Compute.Position.X.Complete(node.Parent.Compute.X + node.NodeConfiguration.Left.Value);
if (node.NodeConfiguration.Right.ValueType != CogaValueMode.Undefined)
{
node.Compute.Size.X.Complete((node.Parent.Compute.Width - node.NodeConfiguration.Right.Value) - node.Compute.X);
}
}
else if (node.NodeConfiguration.Right.ValueType != CogaValueMode.Undefined)
{
if (node.Compute.Size.X.Resolved != false)
{
var right = node.Parent.Compute.X + node.Parent.Compute.Width - node.NodeConfiguration.Right.Value;
node.Compute.Position.X.Complete(right - node.Compute.Width);
}
}
// Then the up and down absolute positioning values.
if (node.NodeConfiguration.Top.ValueType != CogaValueMode.Undefined)
{
node.Compute.Position.Y.Complete(node.Parent.Compute.Y + node.NodeConfiguration.Top.Value);
if (node.NodeConfiguration.Bottom.ValueType != CogaValueMode.Undefined)
{
node.Compute.Size.Y.Complete((node.Parent.Compute.Height - node.NodeConfiguration.Bottom.Value) - node.Compute.Y);
}
}
else if (node.NodeConfiguration.Bottom.ValueType != CogaValueMode.Undefined)
{
if (node.Compute.Size.Y.Resolved != false)
{
var bottom = node.Parent.Compute.Y + node.Parent.Compute.Height - node.NodeConfiguration.Bottom.Value;
node.Compute.Position.Y.Complete(bottom - node.Compute.Height);
}
}
}
internal static void JustifyChildren(CogaNode node)
{
switch (node.NodeConfiguration.Justification)
{
case CogaJustify.Default:
JustifyFlexStart(node);
break;
case CogaJustify.FlexStart:
JustifyFlexStart(node);
break;
case CogaJustify.FlexEnd:
JustifyFlexEnd(node);
break;
case CogaJustify.Center:
JustifyCenter(node);
break;
}
}
internal static void CalculateSize(this CogaNode node)
{
// Now calculate the actual sizes.
CalculateWidth(node);
CalculateHeight(node);
}
void StartDrag(CogaNode node)
{
}
void Drag(CogaNode node, Vector2 vec)
{
}
public CogaNode SetFocus(CogaNode newFocus) => Focus = newFocus as UIComponent;
public void SetHover(CogaNode node)
{
Hover = node as UIComponent;
}