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rui/viewStyle.go

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package rui
import (
"fmt"
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"sort"
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"strconv"
"strings"
)
// ViewStyle interface of the style of view
type ViewStyle interface {
Properties
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// Transition returns the transition animation of the property. Returns nil is there is no transition animation.
Transition(tag string) Animation
// Transitions returns the map of transition animations. The result is always non-nil.
Transitions() map[string]Animation
// SetTransition sets the transition animation for the property if "animation" argument is not nil, and
// removes the transition animation of the property if "animation" argument is nil.
// The "tag" argument is the property name.
SetTransition(tag string, animation Animation)
cssViewStyle(buffer cssBuilder, session Session)
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}
type viewStyle struct {
propertyList
transitions map[string]Animation
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}
// Range defines range limits. The First and Last value are included in the range
type Range struct {
First, Last int
}
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type stringWriter interface {
writeString(buffer *strings.Builder, indent string)
}
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// String returns a string representation of the Range struct
func (r Range) String() string {
if r.First == r.Last {
return fmt.Sprintf("%d", r.First)
}
return fmt.Sprintf("%d:%d", r.First, r.Last)
}
func (r *Range) setValue(value string) bool {
var err error
if strings.Contains(value, ":") {
values := strings.Split(value, ":")
if len(values) != 2 {
ErrorLog("Invalid range value: " + value)
return false
}
if r.First, err = strconv.Atoi(strings.Trim(values[0], " \t\n\r")); err != nil {
ErrorLog(`Invalid first range value "` + value + `" (` + err.Error() + ")")
return false
}
if r.Last, err = strconv.Atoi(strings.Trim(values[1], " \t\n\r")); err != nil {
ErrorLog(`Invalid last range value "` + value + `" (` + err.Error() + ")")
return false
}
return true
}
if r.First, err = strconv.Atoi(value); err != nil {
ErrorLog(`Invalid range value "` + value + `" (` + err.Error() + ")")
return false
}
r.Last = r.First
return true
}
func (style *viewStyle) init() {
style.propertyList.init()
//style.shadows = []ViewShadow{}
style.transitions = map[string]Animation{}
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}
// NewViewStyle create new ViewStyle object
func NewViewStyle(params Params) ViewStyle {
style := new(viewStyle)
style.init()
for tag, value := range params {
style.Set(tag, value)
}
return style
}
func (style *viewStyle) cssTextDecoration(session Session) string {
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
noDecoration := false
if strikethrough, ok := boolProperty(style, Strikethrough, session); ok {
if strikethrough {
buffer.WriteString("line-through")
}
noDecoration = true
}
if overline, ok := boolProperty(style, Overline, session); ok {
if overline {
if buffer.Len() > 0 {
buffer.WriteRune(' ')
}
buffer.WriteString("overline")
}
noDecoration = true
}
if underline, ok := boolProperty(style, Underline, session); ok {
if underline {
if buffer.Len() > 0 {
buffer.WriteRune(' ')
}
buffer.WriteString("underline")
}
noDecoration = true
}
if buffer.Len() == 0 && noDecoration {
return "none"
}
return buffer.String()
}
func split4Values(text string) []string {
values := strings.Split(text, ",")
count := len(values)
switch count {
case 1, 4:
return values
case 2:
if strings.Trim(values[1], " \t\r\n") == "" {
return values[:1]
}
case 5:
if strings.Trim(values[4], " \t\r\n") != "" {
return values[:4]
}
}
return []string{}
}
func (style *viewStyle) backgroundCSS(session Session) string {
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if value, ok := style.properties[Background]; ok {
if backgrounds, ok := value.([]BackgroundElement); ok {
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
for _, background := range backgrounds {
if value := background.cssStyle(session); value != "" {
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if buffer.Len() > 0 {
buffer.WriteString(", ")
}
buffer.WriteString(value)
}
}
if buffer.Len() > 0 {
return buffer.String()
}
}
}
return ""
}
func (style *viewStyle) cssViewStyle(builder cssBuilder, session Session) {
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if margin, ok := boundsProperty(style, Margin, session); ok {
margin.cssValue(Margin, builder, session)
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}
if padding, ok := boundsProperty(style, Padding, session); ok {
padding.cssValue(Padding, builder, session)
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}
if border := getBorder(style, Border); border != nil {
border.cssStyle(builder, session)
border.cssWidth(builder, session)
border.cssColor(builder, session)
}
radius := getRadius(style, session)
radius.cssValue(builder, session)
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if outline := getOutline(style); outline != nil {
outline.ViewOutline(session).cssValue(builder, session)
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}
if z, ok := intProperty(style, ZIndex, session, 0); ok {
builder.add(ZIndex, strconv.Itoa(z))
}
if opacity, ok := floatProperty(style, Opacity, session, 1.0); ok && opacity >= 0 && opacity <= 1 {
builder.add(Opacity, strconv.FormatFloat(opacity, 'f', 3, 32))
}
if n, ok := intProperty(style, ColumnCount, session, 0); ok && n > 0 {
builder.add(ColumnCount, strconv.Itoa(n))
}
for _, tag := range []string{
Width, Height, MinWidth, MinHeight, MaxWidth, MaxHeight, Left, Right, Top, Bottom,
TextSize, TextIndent, LetterSpacing, WordSpacing, LineHeight, TextLineThickness,
ListRowGap, ListColumnGap, GridRowGap, GridColumnGap, ColumnGap, ColumnWidth} {
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if size, ok := sizeProperty(style, tag, session); ok && size.Type != Auto {
cssTag, ok := sizeProperties[tag]
if !ok {
cssTag = tag
}
builder.add(cssTag, size.cssString("", session))
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}
}
colorProperties := []struct{ property, cssTag string }{
{BackgroundColor, BackgroundColor},
{TextColor, "color"},
{TextLineColor, "text-decoration-color"},
{CaretColor, CaretColor},
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{AccentColor, AccentColor},
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}
for _, p := range colorProperties {
if color, ok := colorProperty(style, p.property, session); ok && color != 0 {
builder.add(p.cssTag, color.cssString())
}
}
if value, ok := enumProperty(style, BackgroundClip, session, 0); ok {
builder.add(BackgroundClip, enumProperties[BackgroundClip].values[value])
}
if background := style.backgroundCSS(session); background != "" {
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builder.add("background", background)
}
if font, ok := stringProperty(style, FontName, session); ok && font != "" {
builder.add(`font-family`, font)
}
writingMode := 0
for _, tag := range []string{
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Overflow, TextAlign, TextTransform, TextWeight, TextLineStyle, WritingMode, TextDirection,
VerticalTextOrientation, CellVerticalAlign, CellHorizontalAlign, GridAutoFlow, Cursor,
WhiteSpace, WordBreak, TextOverflow, Float, TableVerticalAlign, Resize} {
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if data, ok := enumProperties[tag]; ok {
if tag != VerticalTextOrientation || (writingMode != VerticalLeftToRight && writingMode != VerticalRightToLeft) {
if value, ok := enumProperty(style, tag, session, 0); ok {
cssValue := data.values[value]
if cssValue != "" {
builder.add(data.cssTag, cssValue)
}
if tag == WritingMode {
writingMode = value
}
}
}
}
}
for _, prop := range []struct{ tag, cssTag, off, on string }{
{tag: Italic, cssTag: "font-style", off: "normal", on: "italic"},
{tag: SmallCaps, cssTag: "font-variant", off: "normal", on: "small-caps"},
} {
if flag, ok := boolProperty(style, prop.tag, session); ok {
if flag {
builder.add(prop.cssTag, prop.on)
} else {
builder.add(prop.cssTag, prop.off)
}
}
}
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if tabSize, ok := intProperty(style, TabSize, session, 8); ok && tabSize > 0 {
builder.add(TabSize, strconv.Itoa(tabSize))
}
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if text := style.cssTextDecoration(session); text != "" {
builder.add("text-decoration", text)
}
if userSelect, ok := boolProperty(style, UserSelect, session); ok {
if userSelect {
builder.add("-webkit-user-select", "auto")
builder.add("user-select", "auto")
} else {
builder.add("-webkit-user-select", "none")
builder.add("user-select", "none")
}
}
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if css := shadowCSS(style, Shadow, session); css != "" {
builder.add("box-shadow", css)
}
if css := shadowCSS(style, TextShadow, session); css != "" {
builder.add("text-shadow", css)
}
if value, ok := style.properties[ColumnSeparator]; ok {
if separator, ok := value.(ColumnSeparatorProperty); ok {
if css := separator.cssValue(session); css != "" {
builder.add("column-rule", css)
}
}
}
if avoid, ok := boolProperty(style, AvoidBreak, session); ok {
if avoid {
builder.add("break-inside", "avoid")
} else {
builder.add("break-inside", "auto")
}
}
wrap, _ := enumProperty(style, ListWrap, session, 0)
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orientation, ok := valueToOrientation(style.Get(Orientation), session)
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if ok || wrap > 0 {
cssText := enumProperties[Orientation].cssValues[orientation]
switch wrap {
case ListWrapOn:
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cssText += " wrap"
case ListWrapReverse:
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cssText += " wrap-reverse"
}
builder.add(`flex-flow`, cssText)
}
rows := (orientation == StartToEndOrientation || orientation == EndToStartOrientation)
var hAlignTag, vAlignTag string
if rows {
hAlignTag = `justify-content`
vAlignTag = `align-items`
} else {
hAlignTag = `align-items`
vAlignTag = `justify-content`
}
if align, ok := enumProperty(style, HorizontalAlign, session, LeftAlign); ok {
switch align {
case LeftAlign:
if (!rows && wrap == ListWrapReverse) || orientation == EndToStartOrientation {
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builder.add(hAlignTag, `flex-end`)
} else {
builder.add(hAlignTag, `flex-start`)
}
case RightAlign:
if (!rows && wrap == ListWrapReverse) || orientation == EndToStartOrientation {
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builder.add(hAlignTag, `flex-start`)
} else {
builder.add(hAlignTag, `flex-end`)
}
case CenterAlign:
builder.add(hAlignTag, `center`)
case StretchAlign:
if rows {
builder.add(hAlignTag, `space-between`)
} else {
builder.add(hAlignTag, `stretch`)
}
}
}
if align, ok := enumProperty(style, VerticalAlign, session, LeftAlign); ok {
switch align {
case TopAlign:
if (rows && wrap == ListWrapReverse) || orientation == BottomUpOrientation {
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builder.add(vAlignTag, `flex-end`)
} else {
builder.add(vAlignTag, `flex-start`)
}
case BottomAlign:
if (rows && wrap == ListWrapReverse) || orientation == BottomUpOrientation {
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builder.add(vAlignTag, `flex-start`)
} else {
builder.add(vAlignTag, `flex-end`)
}
case CenterAlign:
builder.add(vAlignTag, `center`)
case StretchAlign:
if rows {
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builder.add(vAlignTag, `stretch`)
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} else {
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builder.add(vAlignTag, `space-between`)
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}
}
}
if r, ok := rangeProperty(style, Row, session); ok {
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builder.add("grid-row", fmt.Sprintf("%d / %d", r.First+1, r.Last+2))
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}
if r, ok := rangeProperty(style, Column, session); ok {
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builder.add("grid-column", fmt.Sprintf("%d / %d", r.First+1, r.Last+2))
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}
if text := style.gridCellSizesCSS(CellWidth, session); text != "" {
builder.add(`grid-template-columns`, text)
}
if text := style.gridCellSizesCSS(CellHeight, session); text != "" {
builder.add(`grid-template-rows`, text)
}
style.writeViewTransformCSS(builder, session)
if clip := getClipShape(style, Clip, session); clip != nil && clip.valid(session) {
builder.add(`clip-path`, clip.cssStyle(session))
}
if clip := getClipShape(style, ShapeOutside, session); clip != nil && clip.valid(session) {
builder.add(`shape-outside`, clip.cssStyle(session))
}
if value := style.getRaw(Filter); value != nil {
if filter, ok := value.(ViewFilter); ok {
if text := filter.cssStyle(session); text != "" {
builder.add(Filter, text)
}
}
}
if value := style.getRaw(BackdropFilter); value != nil {
if filter, ok := value.(ViewFilter); ok {
if text := filter.cssStyle(session); text != "" {
builder.add(`-webkit-backdrop-filter`, text)
builder.add(BackdropFilter, text)
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}
}
}
if transition := style.transitionCSS(session); transition != "" {
builder.add(`transition`, transition)
}
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if animation := style.animationCSS(session); animation != "" {
builder.add(AnimationTag, animation)
}
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if pause, ok := boolProperty(style, AnimationPaused, session); ok {
if pause {
builder.add(`animation-play-state`, `paused`)
} else {
builder.add(`animation-play-state`, `running`)
}
}
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}
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func valueToOrientation(value any, session Session) (int, bool) {
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if value != nil {
switch value := value.(type) {
case int:
return value, true
case string:
text, ok := session.resolveConstants(value)
if !ok {
return 0, false
}
text = strings.ToLower(strings.Trim(text, " \t\n\r"))
switch text {
case "vertical":
return TopDownOrientation, true
case "horizontal":
return StartToEndOrientation, true
}
if result, ok := enumStringToInt(text, enumProperties[Orientation].values, true); ok {
return result, true
}
}
}
return 0, false
}
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func (style *viewStyle) Get(tag string) any {
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return style.get(strings.ToLower(tag))
}
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func (style *viewStyle) get(tag string) any {
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switch tag {
case Border, CellBorder:
return getBorder(&style.propertyList, tag)
case BorderLeft, BorderRight, BorderTop, BorderBottom,
BorderStyle, BorderLeftStyle, BorderRightStyle, BorderTopStyle, BorderBottomStyle,
BorderColor, BorderLeftColor, BorderRightColor, BorderTopColor, BorderBottomColor,
BorderWidth, BorderLeftWidth, BorderRightWidth, BorderTopWidth, BorderBottomWidth:
if border := getBorder(style, Border); border != nil {
return border.Get(tag)
}
return nil
case CellBorderLeft, CellBorderRight, CellBorderTop, CellBorderBottom,
CellBorderStyle, CellBorderLeftStyle, CellBorderRightStyle, CellBorderTopStyle, CellBorderBottomStyle,
CellBorderColor, CellBorderLeftColor, CellBorderRightColor, CellBorderTopColor, CellBorderBottomColor,
CellBorderWidth, CellBorderLeftWidth, CellBorderRightWidth, CellBorderTopWidth, CellBorderBottomWidth:
if border := getBorder(style, CellBorder); border != nil {
return border.Get(tag)
}
return nil
case RadiusX, RadiusY, RadiusTopLeft, RadiusTopLeftX, RadiusTopLeftY,
RadiusTopRight, RadiusTopRightX, RadiusTopRightY,
RadiusBottomLeft, RadiusBottomLeftX, RadiusBottomLeftY,
RadiusBottomRight, RadiusBottomRightX, RadiusBottomRightY:
return getRadiusElement(style, tag)
case ColumnSeparator:
if val, ok := style.properties[ColumnSeparator]; ok {
return val.(ColumnSeparatorProperty)
}
return nil
case ColumnSeparatorStyle, ColumnSeparatorWidth, ColumnSeparatorColor:
if val, ok := style.properties[ColumnSeparator]; ok {
separator := val.(ColumnSeparatorProperty)
return separator.Get(tag)
}
return nil
case Transition:
if len(style.transitions) == 0 {
return nil
}
result := map[string]Animation{}
for tag, animation := range style.transitions {
result[tag] = animation
}
return result
}
return style.propertyList.getRaw(tag)
}
func (style *viewStyle) AllTags() []string {
result := style.propertyList.AllTags()
if len(style.transitions) > 0 {
result = append(result, Transition)
}
return result
}
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func supportedPropertyValue(value any) bool {
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switch value.(type) {
case string:
case []string:
case bool:
case float32:
case float64:
case int:
case stringWriter:
case fmt.Stringer:
case []ViewShadow:
case []View:
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case []any:
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case map[string]Animation:
default:
return false
}
return true
}
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func writePropertyValue(buffer *strings.Builder, tag string, value any, indent string) {
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writeString := func(text string) {
simple := (tag != Text && tag != Title && tag != Summary)
if simple {
if len(text) == 1 {
simple = (text[0] >= '0' && text[0] <= '9') || (text[0] >= 'A' && text[0] <= 'Z') || (text[0] >= 'a' && text[0] <= 'z')
} else {
for _, ch := range text {
if (ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') ||
ch == '+' || ch == '-' || ch == '@' || ch == '/' || ch == '_' || ch == ':' ||
ch == '#' || ch == '%' || ch == 'π' || ch == '°' {
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} else {
simple = false
break
}
}
}
}
if !simple {
replace := []struct{ old, new string }{
{old: "\\", new: `\\`},
{old: "\t", new: `\t`},
{old: "\r", new: `\r`},
{old: "\n", new: `\n`},
{old: "\"", new: `\"`},
}
for _, s := range replace {
text = strings.Replace(text, s.old, s.new, -1)
}
buffer.WriteRune('"')
buffer.WriteString(text)
buffer.WriteRune('"')
} else {
buffer.WriteString(text)
}
}
switch value := value.(type) {
case string:
writeString(value)
case []string:
if len(value) == 0 {
buffer.WriteString("[]")
} else {
size := 0
for _, text := range value {
size += len(text) + 2
}
if size < 80 {
lead := "["
for _, text := range value {
buffer.WriteString(lead)
writeString(text)
lead = ", "
}
} else {
buffer.WriteString("[\n")
for _, text := range value {
buffer.WriteString(indent)
buffer.WriteRune('\t')
writeString(text)
buffer.WriteString(",\n")
}
}
buffer.WriteString(indent)
buffer.WriteRune(']')
}
case bool:
if value {
buffer.WriteString("true")
} else {
buffer.WriteString("false")
}
case float32:
buffer.WriteString(fmt.Sprintf("%g", float64(value)))
case float64:
buffer.WriteString(fmt.Sprintf("%g", value))
case int:
if prop, ok := enumProperties[tag]; ok && value >= 0 && value < len(prop.values) {
buffer.WriteString(prop.values[value])
} else {
buffer.WriteString(strconv.Itoa(value))
}
case stringWriter:
value.writeString(buffer, indent+"\t")
case fmt.Stringer:
writeString(value.String())
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case []ViewShadow:
switch len(value) {
case 0:
// do nothing
case 1:
value[0].writeString(buffer, indent)
default:
buffer.WriteString("[")
indent2 := "\n" + indent + "\t"
for _, shadow := range value {
buffer.WriteString(indent2)
shadow.writeString(buffer, indent)
}
buffer.WriteRune('\n')
buffer.WriteString(indent)
buffer.WriteRune(']')
}
case []View:
switch len(value) {
case 0:
buffer.WriteString("[]\n")
case 1:
writeViewStyle(value[0].Tag(), value[0], buffer, indent)
default:
buffer.WriteString("[\n")
indent2 := indent + "\t"
for _, v := range value {
buffer.WriteString(indent2)
writeViewStyle(v.Tag(), v, buffer, indent2)
buffer.WriteString(",\n")
}
buffer.WriteString(indent)
buffer.WriteRune(']')
}
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case []any:
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switch count := len(value); count {
case 0:
buffer.WriteString("[]")
case 1:
writePropertyValue(buffer, tag, value[0], indent)
default:
buffer.WriteString("[ ")
comma := false
for _, v := range value {
if comma {
buffer.WriteString(", ")
}
writePropertyValue(buffer, tag, v, indent)
comma = true
}
buffer.WriteString(" ]")
}
case map[string]Animation:
switch count := len(value); count {
case 0:
buffer.WriteString("[]")
case 1:
for tag, animation := range value {
animation.writeTransitionString(tag, buffer)
break
}
default:
tags := make([]string, 0, len(value))
for tag := range value {
tags = append(tags, tag)
}
sort.Strings(tags)
buffer.WriteString("[\n")
indent2 := indent + "\t"
for _, tag := range tags {
if animation := value[tag]; animation != nil {
buffer.WriteString(indent2)
animation.writeTransitionString(tag, buffer)
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buffer.WriteString(",\n")
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}
}
buffer.WriteString(indent)
buffer.WriteRune(']')
}
}
}
func writeViewStyle(name string, view ViewStyle, buffer *strings.Builder, indent string) {
buffer.WriteString(name)
buffer.WriteString(" {\n")
indent += "\t"
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writeProperty := func(tag string, value any) {
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if supportedPropertyValue(value) {
buffer.WriteString(indent)
buffer.WriteString(tag)
buffer.WriteString(" = ")
writePropertyValue(buffer, tag, value, indent)
buffer.WriteString(",\n")
}
}
tags := view.AllTags()
removeTag := func(tag string) {
for i, t := range tags {
if t == tag {
if i == 0 {
tags = tags[1:]
} else if i == len(tags)-1 {
tags = tags[:i]
} else {
tags = append(tags[:i], tags[i+1:]...)
}
return
}
}
}
tagOrder := []string{
ID, Row, Column, Top, Right, Bottom, Left, Semantics, Cursor, Visibility,
Opacity, ZIndex, Width, Height, MinWidth, MinHeight, MaxWidth, MaxHeight,
Margin, Padding, BackgroundClip, BackgroundColor, Background, Border, Radius, Outline, Shadow,
Orientation, ListWrap, VerticalAlign, HorizontalAlign, CellWidth, CellHeight,
CellVerticalAlign, CellHorizontalAlign, ListRowGap, ListColumnGap, GridRowGap, GridColumnGap,
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ColumnCount, ColumnWidth, ColumnSeparator, ColumnGap, AvoidBreak,
Current, Expanded, Side, ResizeBorderWidth, EditViewType, MaxLength, Hint, Text, EditWrap,
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TextOverflow, FontName, TextSize, TextColor, TextWeight, Italic, SmallCaps,
Strikethrough, Overline, Underline, TextLineStyle, TextLineThickness,
TextLineColor, TextTransform, TextAlign, WhiteSpace, WordBreak, TextShadow, TextIndent,
LetterSpacing, WordSpacing, LineHeight, TextDirection, WritingMode, VerticalTextOrientation,
}
for _, tag := range tagOrder {
if value := view.Get(tag); value != nil {
removeTag(tag)
writeProperty(tag, value)
}
}
finalTags := []string{
Perspective, PerspectiveOriginX, PerspectiveOriginY, BackfaceVisible, OriginX, OriginY, OriginZ,
TranslateX, TranslateY, TranslateZ, ScaleX, ScaleY, ScaleZ, Rotate, RotateX, RotateY, RotateZ,
SkewX, SkewY, Clip, Filter, BackdropFilter, Summary, Content, Transition}
2022-05-22 12:54:02 +03:00
for _, tag := range finalTags {
removeTag(tag)
}
for _, tag := range tags {
if value := view.Get(tag); value != nil {
writeProperty(tag, value)
}
}
for _, tag := range finalTags {
if value := view.Get(tag); value != nil {
writeProperty(tag, value)
}
}
indent = indent[:len(indent)-1]
buffer.WriteString(indent)
buffer.WriteString("}")
}
func getViewString(view View) string {
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
writeViewStyle(view.Tag(), view, buffer, "")
return buffer.String()
}
func runStringWriter(writer stringWriter) string {
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
writer.writeString(buffer, "")
return buffer.String()
}