rui_orig/viewClip.go

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package rui
import (
"fmt"
"strings"
)
// ClipShape defines a View clipping area
type ClipShape interface {
Properties
fmt.Stringer
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stringWriter
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cssStyle(session Session) string
valid(session Session) bool
}
type insetClip struct {
propertyList
}
type ellipseClip struct {
propertyList
}
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type circleClip struct {
propertyList
}
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type polygonClip struct {
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points []any
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}
// InsetClip creates a rectangle View clipping area.
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// top - offset from the top border of a View;
// right - offset from the right border of a View;
// bottom - offset from the bottom border of a View;
// left - offset from the left border of a View;
// radius - corner radius, pass nil if you don't need to round corners
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func InsetClip(top, right, bottom, left SizeUnit, radius RadiusProperty) ClipShape {
clip := new(insetClip)
clip.init()
clip.Set(Top, top)
clip.Set(Right, right)
clip.Set(Bottom, bottom)
clip.Set(Left, left)
if radius != nil {
clip.Set(Radius, radius)
}
return clip
}
// CircleClip creates a circle View clipping area.
func CircleClip(x, y, radius SizeUnit) ClipShape {
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clip := new(circleClip)
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clip.init()
clip.Set(X, x)
clip.Set(Y, y)
clip.Set(Radius, radius)
return clip
}
// EllipseClip creates a ellipse View clipping area.
func EllipseClip(x, y, rx, ry SizeUnit) ClipShape {
clip := new(ellipseClip)
clip.init()
clip.Set(X, x)
clip.Set(Y, y)
clip.Set(RadiusX, rx)
clip.Set(RadiusY, ry)
return clip
}
// PolygonClip creates a polygon View clipping area.
// The elements of the function argument can be or text constants,
// or the text representation of SizeUnit, or elements of SizeUnit type.
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func PolygonClip(points []any) ClipShape {
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clip := new(polygonClip)
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clip.points = []any{}
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if clip.Set(Points, points) {
return clip
}
return nil
}
// PolygonPointsClip creates a polygon View clipping area.
func PolygonPointsClip(points []SizeUnit) ClipShape {
clip := new(polygonClip)
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clip.points = []any{}
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if clip.Set(Points, points) {
return clip
}
return nil
}
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func (clip *insetClip) Set(tag string, value any) bool {
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switch strings.ToLower(tag) {
case Top, Right, Bottom, Left:
if value == nil {
clip.Remove(tag)
return true
}
return clip.setSizeProperty(tag, value)
case Radius:
return clip.setRadius(value)
case RadiusX, RadiusY, RadiusTopLeft, RadiusTopLeftX, RadiusTopLeftY,
RadiusTopRight, RadiusTopRightX, RadiusTopRightY,
RadiusBottomLeft, RadiusBottomLeftX, RadiusBottomLeftY,
RadiusBottomRight, RadiusBottomRightX, RadiusBottomRightY:
return clip.setRadiusElement(tag, value)
}
ErrorLogF(`"%s" property is not supported by the inset clip shape`, tag)
return false
}
func (clip *insetClip) String() string {
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return runStringWriter(clip)
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}
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func (clip *insetClip) writeString(buffer *strings.Builder, indent string) {
buffer.WriteString("inset { ")
comma := false
for _, tag := range []string{Top, Right, Bottom, Left, Radius} {
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if value, ok := clip.properties[tag]; ok {
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if comma {
buffer.WriteString(", ")
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}
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buffer.WriteString(tag)
buffer.WriteString(" = ")
writePropertyValue(buffer, tag, value, indent)
comma = true
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}
}
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buffer.WriteString(" }")
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}
func (clip *insetClip) cssStyle(session Session) string {
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
leadText := "inset("
for _, tag := range []string{Top, Right, Bottom, Left} {
value, _ := sizeProperty(clip, tag, session)
buffer.WriteString(leadText)
buffer.WriteString(value.cssString("0px"))
leadText = " "
}
if radius := getRadiusProperty(clip); radius != nil {
buffer.WriteString(" round ")
buffer.WriteString(radius.BoxRadius(session).cssString())
}
buffer.WriteRune(')')
return buffer.String()
}
func (clip *insetClip) valid(session Session) bool {
for _, tag := range []string{Top, Right, Bottom, Left, Radius, RadiusX, RadiusY} {
if value, ok := sizeProperty(clip, tag, session); ok && value.Type != Auto && value.Value != 0 {
return true
}
}
return false
}
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func (clip *circleClip) Set(tag string, value any) bool {
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if value == nil {
clip.Remove(tag)
}
switch strings.ToLower(tag) {
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case X, Y, Radius:
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return clip.setSizeProperty(tag, value)
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}
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ErrorLogF(`"%s" property is not supported by the circle clip shape`, tag)
return false
}
func (clip *circleClip) String() string {
return runStringWriter(clip)
}
func (clip *circleClip) writeString(buffer *strings.Builder, indent string) {
buffer.WriteString("circle { ")
comma := false
for _, tag := range []string{Radius, X, Y} {
if value, ok := clip.properties[tag]; ok {
if comma {
buffer.WriteString(", ")
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}
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buffer.WriteString(tag)
buffer.WriteString(" = ")
writePropertyValue(buffer, tag, value, indent)
comma = true
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}
}
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buffer.WriteString(" }")
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}
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func (clip *circleClip) cssStyle(session Session) string {
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
buffer.WriteString("circle(")
r, _ := sizeProperty(clip, Radius, session)
buffer.WriteString(r.cssString("50%"))
buffer.WriteString(" at ")
x, _ := sizeProperty(clip, X, session)
buffer.WriteString(x.cssString("50%"))
buffer.WriteRune(' ')
y, _ := sizeProperty(clip, Y, session)
buffer.WriteString(y.cssString("50%"))
buffer.WriteRune(')')
return buffer.String()
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}
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func (clip *circleClip) valid(session Session) bool {
if value, ok := sizeProperty(clip, Radius, session); ok && value.Value == 0 {
return false
}
return true
}
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func (clip *ellipseClip) Set(tag string, value any) bool {
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if value == nil {
clip.Remove(tag)
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}
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switch strings.ToLower(tag) {
case X, Y, RadiusX, RadiusY:
return clip.setSizeProperty(tag, value)
case Radius:
return clip.setSizeProperty(RadiusX, value) &&
clip.setSizeProperty(RadiusY, value)
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}
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ErrorLogF(`"%s" property is not supported by the ellipse clip shape`, tag)
return false
}
func (clip *ellipseClip) String() string {
return runStringWriter(clip)
}
func (clip *ellipseClip) writeString(buffer *strings.Builder, indent string) {
buffer.WriteString("ellipse { ")
comma := false
for _, tag := range []string{RadiusX, RadiusY, X, Y} {
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if value, ok := clip.properties[tag]; ok {
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if comma {
buffer.WriteString(", ")
}
buffer.WriteString(tag)
buffer.WriteString(" = ")
writePropertyValue(buffer, tag, value, indent)
comma = true
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}
}
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buffer.WriteString(" }")
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}
func (clip *ellipseClip) cssStyle(session Session) string {
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
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rx, _ := sizeProperty(clip, RadiusX, session)
ry, _ := sizeProperty(clip, RadiusX, session)
buffer.WriteString("ellipse(")
buffer.WriteString(rx.cssString("50%"))
buffer.WriteRune(' ')
buffer.WriteString(ry.cssString("50%"))
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buffer.WriteString(" at ")
x, _ := sizeProperty(clip, X, session)
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buffer.WriteString(x.cssString("50%"))
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buffer.WriteRune(' ')
y, _ := sizeProperty(clip, Y, session)
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buffer.WriteString(y.cssString("50%"))
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buffer.WriteRune(')')
return buffer.String()
}
func (clip *ellipseClip) valid(session Session) bool {
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rx, _ := sizeProperty(clip, RadiusX, session)
ry, _ := sizeProperty(clip, RadiusY, session)
return rx.Value != 0 && ry.Value != 0
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}
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func (clip *polygonClip) Get(tag string) any {
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if Points == strings.ToLower(tag) {
return clip.points
}
return nil
}
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func (clip *polygonClip) getRaw(tag string) any {
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return clip.Get(tag)
}
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func (clip *polygonClip) Set(tag string, value any) bool {
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if Points == strings.ToLower(tag) {
switch value := value.(type) {
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case []any:
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result := true
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clip.points = make([]any, len(value))
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for i, val := range value {
switch val := val.(type) {
case string:
if isConstantName(val) {
clip.points[i] = val
} else if size, ok := StringToSizeUnit(val); ok {
clip.points[i] = size
} else {
notCompatibleType(tag, val)
result = false
}
case SizeUnit:
clip.points[i] = val
default:
notCompatibleType(tag, val)
clip.points[i] = AutoSize()
result = false
}
}
return result
case []SizeUnit:
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clip.points = make([]any, len(value))
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for i, point := range value {
clip.points[i] = point
}
return true
case string:
result := true
values := strings.Split(value, ",")
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clip.points = make([]any, len(values))
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for i, val := range values {
val = strings.Trim(val, " \t\n\r")
if isConstantName(val) {
clip.points[i] = val
} else if size, ok := StringToSizeUnit(val); ok {
clip.points[i] = size
} else {
notCompatibleType(tag, val)
result = false
}
}
return result
}
}
return false
}
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func (clip *polygonClip) setRaw(tag string, value any) {
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clip.Set(tag, value)
}
func (clip *polygonClip) Remove(tag string) {
if Points == strings.ToLower(tag) {
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clip.points = []any{}
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}
}
func (clip *polygonClip) Clear() {
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clip.points = []any{}
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}
func (clip *polygonClip) AllTags() []string {
return []string{Points}
}
func (clip *polygonClip) String() string {
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return runStringWriter(clip)
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}
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func (clip *polygonClip) writeString(buffer *strings.Builder, indent string) {
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buffer.WriteString("inset { ")
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if clip.points != nil {
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buffer.WriteString(Points)
buffer.WriteString(` = "`)
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for i, value := range clip.points {
if i > 0 {
buffer.WriteString(", ")
}
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writePropertyValue(buffer, "", value, indent)
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}
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buffer.WriteString(`" `)
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}
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buffer.WriteRune('}')
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}
func (clip *polygonClip) cssStyle(session Session) string {
count := len(clip.points)
if count < 2 {
return ""
}
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
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writePoint := func(value any) {
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switch value := value.(type) {
case string:
if val, ok := session.resolveConstants(value); ok {
if size, ok := StringToSizeUnit(val); ok {
buffer.WriteString(size.cssString("0px"))
return
}
}
case SizeUnit:
buffer.WriteString(value.cssString("0px"))
return
}
buffer.WriteString("0px")
}
leadText := "polygon("
for i := 1; i < count; i += 2 {
buffer.WriteString(leadText)
writePoint(clip.points[i-1])
buffer.WriteRune(' ')
writePoint(clip.points[i])
leadText = ", "
}
buffer.WriteRune(')')
return buffer.String()
}
func (clip *polygonClip) valid(session Session) bool {
if clip.points == nil || len(clip.points) == 0 {
return false
}
return true
}
func parseClipShape(obj DataObject) ClipShape {
switch obj.Tag() {
case "inset":
clip := new(insetClip)
for _, tag := range []string{Top, Right, Bottom, Left, Radius, RadiusX, RadiusY} {
if value, ok := obj.PropertyValue(tag); ok {
clip.Set(tag, value)
}
}
return clip
case "circle":
clip := new(ellipseClip)
for _, tag := range []string{X, Y, Radius} {
if value, ok := obj.PropertyValue(tag); ok {
clip.Set(tag, value)
}
}
return clip
case "ellipse":
clip := new(ellipseClip)
for _, tag := range []string{X, Y, RadiusX, RadiusY} {
if value, ok := obj.PropertyValue(tag); ok {
clip.Set(tag, value)
}
}
return clip
case "polygon":
clip := new(ellipseClip)
if value, ok := obj.PropertyValue(Points); ok {
clip.Set(Points, value)
}
return clip
}
return nil
}
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func (style *viewStyle) setClipShape(tag string, value any) bool {
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switch value := value.(type) {
case ClipShape:
style.properties[tag] = value
return true
case string:
if isConstantName(value) {
style.properties[tag] = value
return true
}
if obj := NewDataObject(value); obj == nil {
if clip := parseClipShape(obj); clip != nil {
style.properties[tag] = clip
return true
}
}
case DataObject:
if clip := parseClipShape(value); clip != nil {
style.properties[tag] = clip
return true
}
case DataValue:
if value.IsObject() {
if clip := parseClipShape(value.Object()); clip != nil {
style.properties[tag] = clip
return true
}
}
}
notCompatibleType(tag, value)
return false
}
func getClipShape(prop Properties, tag string, session Session) ClipShape {
if value := prop.getRaw(tag); value != nil {
switch value := value.(type) {
case ClipShape:
return value
case string:
if text, ok := session.resolveConstants(value); ok {
if obj := NewDataObject(text); obj == nil {
return parseClipShape(obj)
}
}
}
}
return nil
}
// GetClip returns a View clipping area.
// If the second argument (subviewID) is "" then a top position of the first argument (view) is returned
func GetClip(view View, subviewID string) ClipShape {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
return getClipShape(view, Clip, view.Session())
}
return nil
}
// GetShapeOutside returns a shape around which adjacent inline content.
// If the second argument (subviewID) is "" then a top position of the first argument (view) is returned
func GetShapeOutside(view View, subviewID string) ClipShape {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
return getClipShape(view, ShapeOutside, view.Session())
}
return nil
}