flex

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 Go to latest Published: Aug 4, 2020 License: BSD-3-Clause Imports: 5 Imported by: 0

README

flex - CSS flexbox layout implementation in Go

Go implementation of flexbox CSS layout algorithm.

A pure Go port of Facebook's Yoga.

How to use

Read tutorial or look at _test.go files.

Status

The port is finished. The code works and passess all Yoga tests.

The API is awkward by Go standards but it's the best I could do given that I want to stay close to C version.

Logic is currently synced up to https://github.com/facebook/yoga/commit/f45059e1e696727c1282742b89d2c8bf06345254

How the port was made

You can read a detailed story.

In short:

  • manually ported C code to Go, line-by-line
  • manually ported tests to Go
  • tweak the API from C style to be more Go like. The structure and logic still is very close to C code (this makes porting future C changes easy)

Documentation

Index

Constants

View Source 
const (
	// EdgeCount is count of edges
	EdgeCount = 9
)

Variables

View Source 
var (
	// ValueUndefined defines undefined YGValue
	ValueUndefined = Value{Undefined, UnitUndefined}
	// ValueAuto defines auto YGValue
	ValueAuto = Value{Undefined, UnitAuto}
)
View Source 
var (
	NAN = math.Float32frombits(uvnan)
)
View Source 
var (
	// Undefined defines undefined value
	Undefined = NAN
)
View Source 
var (

	// ValueZero defines a zero value
	ValueZero = Value{Value: 0, Unit: UnitPoint}
)

Functions

func AlignToString 

func AlignToString(value Align) string

AlignToString returns string version of Align enum

func Baseline 

func Baseline(node *Node) float32

Baseline retuns baseline

func CalculateLayout 

func CalculateLayout(node *Node, parentWidth float32, parentHeight float32, parentDirection Direction)

CalculateLayout calculates layout

func ConfigCopy 

func ConfigCopy(dest *Config, src *Config)

ConfigCopy copies a config

func DefaultLog 

func DefaultLog(config *Config, node *Node, level LogLevel, format string,
	args ...interface{}) int

DefaultLog is default logging function

func DimensionToString 

func DimensionToString(value Dimension) string

DimensionToString returns string version of Dimension enum

func DirectionToString 

func DirectionToString(value Direction) string

DirectionToString returns string version of Direction enum

func DisplayToString 

func DisplayToString(value Display) string

DisplayToString returns string version of Display enum

func EdgeToString 

func EdgeToString(value Edge) string

EdgeToString returns string version of Edge enum

func ExperimentalFeatureToString 

func ExperimentalFeatureToString(value ExperimentalFeature) string

ExperimentalFeatureToString returns string version of ExperimentalFeature enum

func FlexDirectionToString 

func FlexDirectionToString(value FlexDirection) string

FlexDirectionToString returns string version of FlexDirection enum

func FloatIsUndefined 

func FloatIsUndefined(value float32) bool

FloatIsUndefined returns true if value is undefined

func FloatsEqual 

func FloatsEqual(a float32, b float32) bool

FloatsEqual returns true if floats are approx. equal

func IsNaN 

func IsNaN(f float32) (is bool)

IsNaN reports whether f is an IEEE 754 “not-a-number” value.

func JustifyToString 

func JustifyToString(value Justify) string

JustifyToString returns string version of Justify enum

func LogLevelToString 

func LogLevelToString(value LogLevel) string

LogLevelToString returns string version of LogLevel enum

func MeasureModeToString 

func MeasureModeToString(value MeasureMode) string

MeasureModeToString returns string version of MeasureMode enum

func NaN 

func NaN() float32

NaN returns an IEEE 754 “not-a-number” value.

func NodeCopyStyle 

func NodeCopyStyle(dstNode *Node, srcNode *Node)

NodeCopyStyle copies style

func NodePrint 

func NodePrint(node *Node, options PrintOptions)

NodePrint prints node to standard output.

func NodeStyleSetFlexBasisAuto 

func NodeStyleSetFlexBasisAuto(node *Node)

NodeStyleSetFlexBasisAuto sets flex basis auto

func NodeTypeToString 

func NodeTypeToString(value NodeType) string

NodeTypeToString returns string version of NodeType enum

func OverflowToString 

func OverflowToString(value Overflow) string

OverflowToString returns string version of Overflow enum

func PositionTypeToString 

func PositionTypeToString(value PositionType) string

PositionTypeToString returns string version of PositionType enum

func PrintOptionsToString 

func PrintOptionsToString(value PrintOptions) string

PrintOptionsToString returns string version of PrintOptions enum

func UnitToString 

func UnitToString(value Unit) string

UnitToString returns string version of Unit enum

func ValueEqual 

func ValueEqual(a Value, b Value) bool

ValueEqual returns true if values are equal

func WrapToString 

func WrapToString(value Wrap) string

WrapToString returns string version of Wrap enum

Types

type Align 

type Align int

Align describes align flex attribute 

const (
	// AlignAuto is "auto"
	AlignAuto Align = iota
	// AlignFlexStart is "flex-start"
	AlignFlexStart
	// AlignCenter if "center"
	AlignCenter
	// AlignFlexEnd is "flex-end"
	AlignFlexEnd
	// AlignStretch is "strech"
	AlignStretch
	// AlignBaseline is "baseline"
	AlignBaseline
	// AlignSpaceBetween is "space-between"
	AlignSpaceBetween
	// AlignSpaceAround is "space-around"
	AlignSpaceAround
)

type BaselineFunc 

type BaselineFunc func(node *Node, width float32, height float32) float32

BaselineFunc describes function for baseline

type CachedMeasurement 

type CachedMeasurement struct {
	// contains filtered or unexported fields
}

CachedMeasurement describes measurements

type Config 

type Config struct {
	UseWebDefaults            bool
	UseLegacyStretchBehaviour bool
	PointScaleFactor          float32
	Logger                    Logger
	Context                   interface{}
	// contains filtered or unexported fields
}

Config describes a configuration

func ConfigGetDefault 

func ConfigGetDefault() *Config

ConfigGetDefault returns default config, only for C#

func NewConfig 

func NewConfig() *Config

NewConfig creates new config

func (*Config) IsExperimentalFeatureEnabled 

func (config *Config) IsExperimentalFeatureEnabled(feature ExperimentalFeature) bool

IsExperimentalFeatureEnabled returns if experimental feature is enabled

func (*Config) SetExperimentalFeatureEnabled 

func (config *Config) SetExperimentalFeatureEnabled(feature ExperimentalFeature, enabled bool)

SetExperimentalFeatureEnabled enables experimental feature

func (*Config) SetPointScaleFactor 

func (config *Config) SetPointScaleFactor(pixelsInPoint float32)

SetPointScaleFactor sets scale factor

type Dimension 

type Dimension int

Dimension represents dimention 

const (
	// DimensionWidth is width
	DimensionWidth Dimension = iota
	// DimensionHeight is height
	DimensionHeight
)

type Direction 

type Direction int

Direction represents right-to-left or left-to-right direction 

const (
	// DirectionInherit is "inherit"
	DirectionInherit Direction = iota
	// DirectionLTR is "ltr"
	DirectionLTR
	// DirectionRTL is "rtl"
	DirectionRTL
)

type Display 

type Display int

Display is "display" property 

const (
	// DisplayFlex is "flex"
	DisplayFlex Display = iota
	// DisplayNone is "none"
	DisplayNone
)

type Edge 

type Edge int

Edge represents an edge 

const (
	// EdgeLeft is left edge
	EdgeLeft Edge = iota
	// EdgeTop is top edge
	EdgeTop
	// EdgeRight is right edge
	EdgeRight
	// EdgeBottom is bottom edge
	EdgeBottom
	// EdgeStart is start edge
	EdgeStart
	// EdgeEnd is end edge
	EdgeEnd
	// EdgeHorizontal is horizontal edge
	EdgeHorizontal
	// EdgeVertical is vertical edge
	EdgeVertical
	// EdgeAll is all edge
	EdgeAll
)

type ExperimentalFeature 

type ExperimentalFeature int

ExperimentalFeature defines experimental features 

const (
	// ExperimentalFeatureWebFlexBasis is web flex basis
	ExperimentalFeatureWebFlexBasis ExperimentalFeature = iota
)

type FlexDirection 

type FlexDirection int

FlexDirection describes "flex-direction" property 

const (
	// FlexDirectionColumn is "column"
	FlexDirectionColumn FlexDirection = iota
	// FlexDirectionColumnReverse is "column-reverse"
	FlexDirectionColumnReverse
	// FlexDirectionRow is "row"
	FlexDirectionRow
	// FlexDirectionRowReverse is "row-reverse"
	FlexDirectionRowReverse
)

type Justify 

type Justify int

Justify is "justify" property 

const (
	// JustifyFlexStart is "flex-start"
	JustifyFlexStart Justify = iota
	// JustifyCenter is "center"
	JustifyCenter
	// JustifyFlexEnd is "flex-end"
	JustifyFlexEnd
	// JustifySpaceBetween is "space-between"
	JustifySpaceBetween
	// JustifySpaceAround is "space-around"
	JustifySpaceAround
)

type Layout 

type Layout struct {
	Position   [4]float32
	Dimensions [2]float32
	Margin     [6]float32
	Border     [6]float32
	Padding    [6]float32
	Direction  Direction

	HadOverflow bool
	// contains filtered or unexported fields
}

Layout describes position information after layout is finished

type LogLevel 

type LogLevel int

LogLevel represents log level 

const (
	LogLevelError LogLevel = iota
	LogLevelWarn
	LogLevelInfo
	LogLevelDebug
	LogLevelVerbose
	LogLevelFatal
)

type Logger 

type Logger func(config *Config, node *Node, level LogLevel, format string, args ...interface{}) int

Logger defines logging function

type MeasureFunc 

type MeasureFunc func(node *Node, width float32, widthMode MeasureMode, height float32, heightMode MeasureMode) Size

MeasureFunc describes function for measuring

type MeasureMode 

type MeasureMode int

MeasureMode defines measurement mode 

const (
	// MeasureModeUndefined is undefined
	MeasureModeUndefined MeasureMode = iota
	// MeasureModeExactly is exactly
	MeasureModeExactly
	// MeasureModeAtMost is at-most
	MeasureModeAtMost
)

type Node 

type Node struct {
	Style  Style
	Layout Layout

	Parent   *Node
	Children []*Node

	NextChild *Node

	Measure  MeasureFunc
	Baseline BaselineFunc
	Print    PrintFunc
	Config   *Config
	Context  interface{}

	IsDirty      bool
	HasNewLayout bool
	NodeType     NodeType
	// contains filtered or unexported fields
}

Node describes a an element

func NewNode 

func NewNode() *Node

NewNode creates a new node

func NewNodeWithConfig 

func NewNodeWithConfig(config *Config) *Node

NewNodeWithConfig creates new node with config

func (*Node) GetChild 

func (node *Node) GetChild(idx int) *Node

GetChild returns a child at a given index

func (*Node) InsertChild 

func (node *Node) InsertChild(child *Node, idx int)

InsertChild inserts a child

func (*Node) LayoutGetBorder 

func (node *Node) LayoutGetBorder(edge Edge) float32

LayoutGetBorder gets border

func (*Node) LayoutGetBottom 

func (node *Node) LayoutGetBottom() float32

LayoutGetBottom gets bottom

func (*Node) LayoutGetHeight 

func (node *Node) LayoutGetHeight() float32

LayoutGetHeight gets height

func (*Node) LayoutGetLeft 

func (node *Node) LayoutGetLeft() float32

LayoutGetLeft gets left

func (*Node) LayoutGetMargin 

func (node *Node) LayoutGetMargin(edge Edge) float32

LayoutGetMargin gets margin

func (*Node) LayoutGetPadding 

func (node *Node) LayoutGetPadding(edge Edge) float32

LayoutGetPadding gets padding

func (*Node) LayoutGetRight 

func (node *Node) LayoutGetRight() float32

LayoutGetRight gets right

func (*Node) LayoutGetTop 

func (node *Node) LayoutGetTop() float32

LayoutGetTop gets top

func (*Node) LayoutGetWidth 

func (node *Node) LayoutGetWidth() float32

LayoutGetWidth gets width

func (*Node) MarkDirty 

func (node *Node) MarkDirty()

MarkDirty marks node as dirty

func (*Node) RemoveChild 

func (node *Node) RemoveChild(child *Node)

RemoveChild removes child node

func (*Node) Reset 

func (node *Node) Reset()

Reset resets a node

func (*Node) SetMeasureFunc 

func (node *Node) SetMeasureFunc(measureFunc MeasureFunc)

SetMeasureFunc sets measure function

func (*Node) StyleGetBorder 

func (node *Node) StyleGetBorder(edge Edge) float32

StyleGetBorder gets border

func (*Node) StyleGetFlexGrow 

func (node *Node) StyleGetFlexGrow() float32

StyleGetFlexGrow gets flex grow

func (*Node) StyleGetFlexShrink 

func (node *Node) StyleGetFlexShrink() float32

StyleGetFlexShrink gets flex shrink

func (*Node) StyleGetHeight 

func (node *Node) StyleGetHeight() Value

StyleGetHeight gets height

func (*Node) StyleGetMargin 

func (node *Node) StyleGetMargin(edge Edge) Value

StyleGetMargin gets margin

func (*Node) StyleGetMaxHeight 

func (node *Node) StyleGetMaxHeight() Value

StyleGetMaxHeight gets max height

func (*Node) StyleGetMaxWidth 

func (node *Node) StyleGetMaxWidth() Value

StyleGetMaxWidth gets max width

func (*Node) StyleGetMinHeight 

func (node *Node) StyleGetMinHeight() Value

StyleGetMinHeight gets min height

func (*Node) StyleGetMinWidth 

func (node *Node) StyleGetMinWidth() Value

StyleGetMinWidth gets min width

func (*Node) StyleGetPadding 

func (node *Node) StyleGetPadding(edge Edge) Value

StyleGetPadding gets padding

func (*Node) StyleGetPosition 

func (node *Node) StyleGetPosition(edge Edge) Value

StyleGetPosition gets position

func (*Node) StyleGetWidth 

func (node *Node) StyleGetWidth() Value

StyleGetWidth gets width

func (*Node) StyleSetAlignContent 

func (node *Node) StyleSetAlignContent(alignContent Align)

StyleSetAlignContent sets align content

func (*Node) StyleSetAlignItems 

func (node *Node) StyleSetAlignItems(alignItems Align)

StyleSetAlignItems sets align content

func (*Node) StyleSetAlignSelf 

func (node *Node) StyleSetAlignSelf(alignSelf Align)

StyleSetAlignSelf sets align self

func (*Node) StyleSetAspectRatio 

func (node *Node) StyleSetAspectRatio(aspectRatio float32)

StyleSetAspectRatio sets axpect ratio

func (*Node) StyleSetBorder 

func (node *Node) StyleSetBorder(edge Edge, border float32)

StyleSetBorder sets border

func (*Node) StyleSetDirection 

func (node *Node) StyleSetDirection(direction Direction)

StyleSetDirection sets direction

func (*Node) StyleSetDisplay 

func (node *Node) StyleSetDisplay(display Display)

StyleSetDisplay sets display

func (*Node) StyleSetFlex 

func (node *Node) StyleSetFlex(flex float32)

StyleSetFlex sets flex

func (*Node) StyleSetFlexBasis 

func (node *Node) StyleSetFlexBasis(flexBasis float32)

StyleSetFlexBasis sets flex basis

func (*Node) StyleSetFlexBasisPercent 

func (node *Node) StyleSetFlexBasisPercent(flexBasis float32)

StyleSetFlexBasisPercent sets flex basis percent

func (*Node) StyleSetFlexDirection 

func (node *Node) StyleSetFlexDirection(flexDirection FlexDirection)

StyleSetFlexDirection sets flex directions

func (*Node) StyleSetFlexGrow 

func (node *Node) StyleSetFlexGrow(flexGrow float32)

StyleSetFlexGrow sets flex grow

func (*Node) StyleSetFlexShrink 

func (node *Node) StyleSetFlexShrink(flexShrink float32)

StyleSetFlexShrink sets flex shrink

func (*Node) StyleSetFlexWrap 

func (node *Node) StyleSetFlexWrap(flexWrap Wrap)

StyleSetFlexWrap sets flex wrap

func (*Node) StyleSetHeight 

func (node *Node) StyleSetHeight(height float32)

StyleSetHeight sets height

func (*Node) StyleSetHeightAuto 

func (node *Node) StyleSetHeightAuto()

StyleSetHeightAuto sets height auto

func (*Node) StyleSetHeightPercent 

func (node *Node) StyleSetHeightPercent(height float32)

StyleSetHeightPercent sets height percent

func (*Node) StyleSetJustifyContent 

func (node *Node) StyleSetJustifyContent(justifyContent Justify)

StyleSetJustifyContent sets justify content

func (*Node) StyleSetMargin 

func (node *Node) StyleSetMargin(edge Edge, margin float32)

StyleSetMargin sets margin

func (*Node) StyleSetMarginAuto 

func (node *Node) StyleSetMarginAuto(edge Edge)

StyleSetMarginAuto sets margin auto

func (*Node) StyleSetMarginPercent 

func (node *Node) StyleSetMarginPercent(edge Edge, margin float32)

StyleSetMarginPercent sets margin percent

func (*Node) StyleSetMaxHeight 

func (node *Node) StyleSetMaxHeight(maxHeight float32)

StyleSetMaxHeight sets max width

func (*Node) StyleSetMaxHeightPercent 

func (node *Node) StyleSetMaxHeightPercent(maxHeight float32)

StyleSetMaxHeightPercent sets max height percent

func (*Node) StyleSetMaxWidth 

func (node *Node) StyleSetMaxWidth(maxWidth float32)

StyleSetMaxWidth sets max width

func (*Node) StyleSetMaxWidthPercent 

func (node *Node) StyleSetMaxWidthPercent(maxWidth float32)

StyleSetMaxWidthPercent sets max width percent

func (*Node) StyleSetMinHeight 

func (node *Node) StyleSetMinHeight(minHeight float32)

StyleSetMinHeight sets min width

func (*Node) StyleSetMinHeightPercent 

func (node *Node) StyleSetMinHeightPercent(minHeight float32)

StyleSetMinHeightPercent sets min height percent

func (*Node) StyleSetMinWidth 

func (node *Node) StyleSetMinWidth(minWidth float32)

StyleSetMinWidth sets min width

func (*Node) StyleSetMinWidthPercent 

func (node *Node) StyleSetMinWidthPercent(minWidth float32)

StyleSetMinWidthPercent sets width percent

func (*Node) StyleSetOverflow 

func (node *Node) StyleSetOverflow(overflow Overflow)

StyleSetOverflow sets overflow

func (*Node) StyleSetPadding 

func (node *Node) StyleSetPadding(edge Edge, padding float32)

StyleSetPadding sets padding

func (*Node) StyleSetPaddingPercent 

func (node *Node) StyleSetPaddingPercent(edge Edge, padding float32)

StyleSetPaddingPercent sets padding percent

func (*Node) StyleSetPosition 

func (node *Node) StyleSetPosition(edge Edge, position float32)

StyleSetPosition sets position

func (*Node) StyleSetPositionPercent 

func (node *Node) StyleSetPositionPercent(edge Edge, position float32)

StyleSetPositionPercent sets position percent

func (*Node) StyleSetPositionType 

func (node *Node) StyleSetPositionType(positionType PositionType)

StyleSetPositionType sets position type

func (*Node) StyleSetWidth 

func (node *Node) StyleSetWidth(width float32)

StyleSetWidth sets width

func (*Node) StyleSetWidthAuto 

func (node *Node) StyleSetWidthAuto()

StyleSetWidthAuto sets width auto

func (*Node) StyleSetWidthPercent 

func (node *Node) StyleSetWidthPercent(width float32)

StyleSetWidthPercent sets width percent

type NodePrinter 

type NodePrinter struct {
	// contains filtered or unexported fields
}

NodePrinter node printer.

func NewNodePrinter 

func NewNodePrinter(writer io.Writer, options PrintOptions) *NodePrinter

NewNodePrinter creates new node printer.

func (*NodePrinter) Print 

func (printer *NodePrinter) Print(node *Node)

Print prints node.

type NodeType 

type NodeType int

NodeType defines node type 

const (
	// NodeTypeDefault is default node
	NodeTypeDefault NodeType = iota
	// NodeTypeText is text node
	NodeTypeText
)

type Overflow 

type Overflow int

Overflow describes "overflow" property 

const (
	// OverflowVisible is "visible"
	OverflowVisible Overflow = iota
	// OverflowHidden is "hidden"
	OverflowHidden
	// OverflowScroll is "scroll"
	OverflowScroll
)

type PositionType 

type PositionType int

PositionType is "position" property 

const (
	// PositionTypeRelative is "relative"
	PositionTypeRelative PositionType = iota
	// PositionTypeAbsolute is "absolute"
	PositionTypeAbsolute
)

type PrintFunc 

type PrintFunc func(node *Node)

PrintFunc defines function for printing

type PrintOptions 

type PrintOptions int
const (
	PrintOptionsLayout PrintOptions = 1 << iota
	PrintOptionsStyle
	PrintOptionsChildren
)

type Size 

type Size struct {
	Width  float32
	Height float32
}

Size describes size

type Style 

type Style struct {
	Direction      Direction
	FlexDirection  FlexDirection
	JustifyContent Justify
	AlignContent   Align
	AlignItems     Align
	AlignSelf      Align
	PositionType   PositionType
	FlexWrap       Wrap
	Overflow       Overflow
	Display        Display
	Flex           float32
	FlexGrow       float32
	FlexShrink     float32
	FlexBasis      Value
	Margin         [EdgeCount]Value
	Position       [EdgeCount]Value
	Padding        [EdgeCount]Value
	Border         [EdgeCount]Value
	Dimensions     [2]Value
	MinDimensions  [2]Value
	MaxDimensions  [2]Value

	// Yoga specific properties, not compatible with flexbox specification
	AspectRatio float32
}

Style describes CSS flexbox style of the node

type Unit 

type Unit int

Unit is "unit" property 

const (
	// UnitUndefined is "undefined"
	UnitUndefined Unit = iota
	// UnitPoint is "point"
	UnitPoint
	// UnitPercent is "percent"
	UnitPercent
	// UnitAuto is "auto"
	UnitAuto
)

type Value 

type Value struct {
	Value float32
	Unit  Unit
}

Value describes value

type Wrap 

type Wrap int

Wrap is "wrap" property 

const (
	// WrapNoWrap is "no-wrap"
	WrapNoWrap Wrap = iota
	// WrapWrap is "wrap"
	WrapWrap
	// WrapWrapReverse is "reverse"
	WrapWrapReverse
)

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