public YogaStyle()
{
Direction = YogaDirection.Inherit;
FlexDirection = YogaFlexDirection.Column;
JustifyContent = YogaJustify.FlexStart;
AlignContent = YogaAlign.FlexStart;
AlignItems = YogaAlign.Stretch;
AlignSelf = YogaAlign.Auto;
PositionType = YogaPositionType.Relative;
FlexWrap = YogaWrap.NoWrap;
Overflow = YogaOverflow.Visible;
Display = YogaDisplay.Flex;
Flex = null;
FlexGrow = null;
FlexShrink = null;
FlexBasis = YogaValue.Auto;
Margin = YogaArray.From(DefaultEdgeValuesUnit);
Position = YogaArray.From(DefaultEdgeValuesUnit);
Padding = YogaArray.From(DefaultEdgeValuesUnit);
Border = YogaArray.From(DefaultEdgeValuesUnit);
Dimensions = YogaArray.From(DefaultDimensionValuesAutoUnit);
MinDimensions = YogaArray.From(DefaultDimensionValuesUnit);
MaxDimensions = YogaArray.From(DefaultDimensionValuesUnit);
AspectRatio = null;
}
public void CopyFrom(YogaStyle other)
{
Direction = other.Direction;
FlexDirection = other.FlexDirection;
JustifyContent = other.JustifyContent;
AlignContent = other.AlignContent;
AlignItems = other.AlignItems;
AlignSelf = other.AlignSelf;
PositionType = other.PositionType;
FlexWrap = other.FlexWrap;
Overflow = other.Overflow;
Display = other.Display;
Flex = other.Flex;
FlexGrow = other.FlexGrow;
FlexShrink = other.FlexShrink;
FlexBasis = other.FlexBasis;
Margin.CopyFrom(other.Margin);
Position.CopyFrom(other.Position);
Padding.CopyFrom(other.Padding);
Border.CopyFrom(other.Border);
Dimensions.CopyFrom(other.Dimensions);
MinDimensions.CopyFrom(other.MinDimensions);
MaxDimensions.CopyFrom(other.MaxDimensions);
AspectRatio = other.AspectRatio;
}
public YogaValue GetMarginLeadingValue(YogaFlexDirection axis)
{
if (axis.IsRow() && _style.Margin[YogaEdge.Start].Unit != YogaUnit.Undefined)
{
return(_style.Margin[YogaEdge.Start]);
}
return(_style.Margin[Leading[axis]]);
}
public YogaValue GetMarginTrailingValue(YogaFlexDirection axis)
{
if (axis.IsRow() && _style.Margin[YogaEdge.End].Unit != YogaUnit.Undefined)
{
return(_style.Margin[YogaEdge.End]);
}
return(_style.Margin[Trailing[axis]]);
}
public float?GetTrailingMargin(YogaFlexDirection axis, float?widthSize)
{
if (axis.IsRow() && _style.Margin[YogaEdge.End].Unit != YogaUnit.Undefined)
{
return(ResolveValueMargin(_style.Margin[YogaEdge.End], widthSize));
}
return(ResolveValueMargin(ComputedEdgeValue(_style.Margin, Trailing[axis], YogaValue.Zero), widthSize));
}
private YogaNode createYGNode(YogaConfig config, YogaFlexDirection flexDirection, int width, int height, bool alignBaseline)
{
YogaNode node = new YogaNode(config);
node.FlexDirection = flexDirection;
node.Width = width;
node.Height = height;
if (alignBaseline)
{
node.AlignItems = YogaAlign.Baseline;
}
return(node);
}
public float GetTrailingBorder(YogaFlexDirection flexDirection)
{
if (flexDirection.IsRow() &&
_style.Border[YogaEdge.End].Unit != YogaUnit.Undefined &&
_style.Border[YogaEdge.End].Value != null &&
_style.Border[YogaEdge.End].Value >= 0.0f)
{
return(_style.Border[YogaEdge.End].Value.Value);
}
var computedEdgeValue = ComputedEdgeValue(_style.Border, Trailing[flexDirection], YogaValue.Zero).Value;
return(YogaMath.Max(computedEdgeValue, 0.0f));
}
public float GetLeadingBorder(YogaFlexDirection axis)
{
if (axis.IsRow() &&
_style.Border[YogaEdge.Start].Unit != YogaUnit.Undefined &&
_style.Border[YogaEdge.Start].Value != null &&
_style.Border[YogaEdge.Start].Value >= 0.0f)
{
return(_style.Border[YogaEdge.Start].Value.Value);
}
var computedEdgeValue = ComputedEdgeValue(_style.Border, Leading[axis], YogaValue.Zero).Value;
return(YogaMath.Max(computedEdgeValue, 0.0F));
}
public static YogaFlexDirection ResolveFlexDirection(this YogaFlexDirection flexDirection, YogaDirection direction)
{
if (direction == YogaDirection.RightToLeft)
{
if (flexDirection == YogaFlexDirection.Row)
{
return(YogaFlexDirection.RowReverse);
}
else if (flexDirection == YogaFlexDirection.RowReverse)
{
return(YogaFlexDirection.Row);
}
}
return(flexDirection);
}
// Methods related to positions, margin, padding and border
public float?GetLeadingPosition(YogaFlexDirection axis, float?axisSize)
{
var leadingPosition = default(YogaValue);
if (axis.IsRow())
{
leadingPosition = ComputedEdgeValue(_style.Position, YogaEdge.Start, YogaValue.Undefined);
if (leadingPosition.Unit != YogaUnit.Undefined)
{
return(leadingPosition.Resolve(axisSize));
}
}
leadingPosition = ComputedEdgeValue(_style.Position, Leading[axis], YogaValue.Undefined);
return(leadingPosition.Unit == YogaUnit.Undefined ? 0.0f : leadingPosition.Resolve(axisSize));
}
public float?GetTrailingPosition(YogaFlexDirection axis, float?axisSize)
{
var trailingPosition = default(YogaValue);
if (axis.IsRow())
{
trailingPosition = ComputedEdgeValue(_style.Position, YogaEdge.End, YogaValue.Undefined);
if (trailingPosition.Unit != YogaUnit.Undefined)
{
return(trailingPosition.Resolve(axisSize));
}
}
trailingPosition = ComputedEdgeValue(_style.Position, Trailing[axis], YogaValue.Undefined);
return(trailingPosition.Unit == YogaUnit.Undefined ? 0.0f : trailingPosition.Resolve(axisSize));
}
public float GetTrailingPadding(YogaFlexDirection axis, float?widthSize)
{
var paddingEdgeEnd = _style.Padding[YogaEdge.End].Resolve(widthSize);
if (axis.IsRow() &&
_style.Padding[YogaEdge.End].Unit != YogaUnit.Undefined &&
paddingEdgeEnd != null &&
paddingEdgeEnd >= 0.0f)
{
return(paddingEdgeEnd.Value);
}
var resolvedValue = ComputedEdgeValue(_style.Padding, Trailing[axis], YogaValue.Zero).Resolve(widthSize);
return(YogaMath.Max(resolvedValue, 0.0f));
}
public static extern void YGNodeStyleSetFlexDirection(YGNodeHandle node, YogaFlexDirection flexDirection);
public static YogaFlexDirection FlexDirectionCross(this YogaFlexDirection flexDirection, YogaDirection direction)
{
return(flexDirection.IsColumn()
? YogaFlexDirection.Row.ResolveFlexDirection(direction)
: YogaFlexDirection.Column);
}
public static bool IsColumn(this YogaFlexDirection flexDirection)
{
return(flexDirection == YogaFlexDirection.Column || flexDirection == YogaFlexDirection.ColumnReverse);
}
public static bool IsRow(this YogaFlexDirection flexDirection)
{
return(flexDirection == YogaFlexDirection.Row || flexDirection == YogaFlexDirection.RowReverse);
}
private void SetChildTrailingPosition(YogaNode child, YogaFlexDirection axis)
{
var size = child.Layout.MeasuredDimensions[Dimension[axis]];
child.SetLayoutPosition(Layout.MeasuredDimensions[Dimension[axis]] - size - child.Layout.Position[Position[axis]], Trailing[axis]);
}
public float GetTrailingPaddingAndBorder(YogaFlexDirection axis, float?widthSize)
{
return(GetTrailingPadding(axis, widthSize) + GetTrailingBorder(axis));
}
public static extern void YGNodeStyleSetFlexDirection(IntPtr node, YogaFlexDirection flexDirection);
public float?GetRelativePosition(YogaFlexDirection axis, float?axisSize)
{
return(IsLeadingPositionDefined(axis) ? GetLeadingPosition(axis, axisSize) : -GetTrailingPosition(axis, axisSize));
}
public bool IsTrailingPositionDefined(YogaFlexDirection axis)
{
return((axis.IsRow() && ComputedEdgeValue(_style.Position, YogaEdge.End, YogaValue.Undefined).Unit != YogaUnit.Undefined) ||
ComputedEdgeValue(_style.Position, Trailing[axis], YogaValue.Undefined).Unit != YogaUnit.Undefined);
}
public float?GetMarginForAxis(YogaFlexDirection axis, float?widthSize)
{
return(GetLeadingMargin(axis, widthSize) + GetTrailingMargin(axis, widthSize));
}