forked from mbk-lab/rui_orig
318 lines
9.1 KiB
Go
318 lines
9.1 KiB
Go
package rui
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import (
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"fmt"
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"strings"
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)
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const (
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// ColorTag is the name of the color property of the shadow.
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ColorTag = "color"
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// Inset is the name of bool property of the shadow. If it is set to "false" (default) then the shadow
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// is assumed to be a drop shadow (as if the box were raised above the content).
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// If it is set to "true" then the shadow to one inside the frame (as if the content was depressed inside the box).
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// Inset shadows are drawn inside the border (even transparent ones), above the background, but below content.
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Inset = "inset"
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// XOffset is the name of the SizeUnit property of the shadow that determines the shadow horizontal offset.
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// Negative values place the shadow to the left of the element.
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XOffset = "x-offset"
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// YOffset is the name of the SizeUnit property of the shadow that determines the shadow vertical offset.
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// Negative values place the shadow above the element.
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YOffset = "y-offset"
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// BlurRadius is the name of the SizeUnit property of the shadow that determines the radius of the blur effect.
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// The larger this value, the bigger the blur, so the shadow becomes bigger and lighter. Negative values are not allowed.
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BlurRadius = "blur"
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// SpreadRadius is the name of the SizeUnit property of the shadow. Positive values will cause the shadow to expand
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// and grow bigger, negative values will cause the shadow to shrink.
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SpreadRadius = "spread-radius"
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)
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// ViewShadow contains attributes of the view shadow
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type ViewShadow interface {
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Properties
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fmt.Stringer
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stringWriter
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cssStyle(buffer *strings.Builder, session Session, lead string) bool
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cssTextStyle(buffer *strings.Builder, session Session, lead string) bool
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visible(session Session) bool
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}
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type viewShadowData struct {
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propertyList
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}
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// NewViewShadow create the new shadow for a view. Arguments:
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// offsetX, offsetY - x and y offset of the shadow
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// blurRadius - the blur radius of the shadow
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// spreadRadius - the spread radius of the shadow
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// color - the color of the shadow
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func NewViewShadow(offsetX, offsetY, blurRadius, spreadRadius SizeUnit, color Color) ViewShadow {
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return NewShadowWithParams(Params{
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XOffset: offsetX,
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YOffset: offsetY,
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BlurRadius: blurRadius,
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SpreadRadius: spreadRadius,
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ColorTag: color,
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})
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}
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// NewInsetViewShadow create the new inset shadow for a view. Arguments:
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// offsetX, offsetY - x and y offset of the shadow
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// blurRadius - the blur radius of the shadow
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// spreadRadius - the spread radius of the shadow
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// color - the color of the shadow
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func NewInsetViewShadow(offsetX, offsetY, blurRadius, spreadRadius SizeUnit, color Color) ViewShadow {
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return NewShadowWithParams(Params{
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XOffset: offsetX,
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YOffset: offsetY,
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BlurRadius: blurRadius,
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SpreadRadius: spreadRadius,
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ColorTag: color,
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Inset: true,
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})
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}
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// NewTextShadow create the new text shadow. Arguments:
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// offsetX, offsetY - x and y offset of the shadow
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// blurRadius - the blur radius of the shadow
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// color - the color of the shadow
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func NewTextShadow(offsetX, offsetY, blurRadius SizeUnit, color Color) ViewShadow {
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return NewShadowWithParams(Params{
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XOffset: offsetX,
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YOffset: offsetY,
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BlurRadius: blurRadius,
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ColorTag: color,
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})
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}
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// NewShadowWithParams create the new shadow for a view.
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func NewShadowWithParams(params Params) ViewShadow {
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shadow := new(viewShadowData)
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shadow.propertyList.init()
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if params != nil {
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for _, tag := range []string{ColorTag, Inset, XOffset, YOffset, BlurRadius, SpreadRadius} {
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if value, ok := params[tag]; ok && value != nil {
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shadow.Set(tag, value)
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}
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}
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}
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return shadow
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}
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// parseViewShadow parse DataObject and create ViewShadow object
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func parseViewShadow(object DataObject) ViewShadow {
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shadow := new(viewShadowData)
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shadow.propertyList.init()
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parseProperties(shadow, object)
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return shadow
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}
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func (shadow *viewShadowData) Remove(tag string) {
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delete(shadow.properties, strings.ToLower(tag))
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}
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func (shadow *viewShadowData) Set(tag string, value interface{}) bool {
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if value == nil {
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shadow.Remove(tag)
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return true
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}
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tag = strings.ToLower(tag)
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switch tag {
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case ColorTag, Inset, XOffset, YOffset, BlurRadius, SpreadRadius:
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return shadow.propertyList.Set(tag, value)
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}
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ErrorLogF(`"%s" property is not supported by Shadow`, tag)
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return false
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}
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func (shadow *viewShadowData) Get(tag string) interface{} {
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return shadow.propertyList.Get(strings.ToLower(tag))
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}
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func (shadow *viewShadowData) cssStyle(buffer *strings.Builder, session Session, lead string) bool {
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color, _ := colorProperty(shadow, ColorTag, session)
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offsetX, _ := sizeProperty(shadow, XOffset, session)
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offsetY, _ := sizeProperty(shadow, YOffset, session)
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blurRadius, _ := sizeProperty(shadow, BlurRadius, session)
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spreadRadius, _ := sizeProperty(shadow, SpreadRadius, session)
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if color.Alpha() == 0 ||
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((offsetX.Type == Auto || offsetX.Value == 0) &&
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(offsetY.Type == Auto || offsetY.Value == 0) &&
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(blurRadius.Type == Auto || blurRadius.Value == 0) &&
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(spreadRadius.Type == Auto || spreadRadius.Value == 0)) {
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return false
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}
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buffer.WriteString(lead)
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if inset, _ := boolProperty(shadow, Inset, session); inset {
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buffer.WriteString("inset ")
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}
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buffer.WriteString(offsetX.cssString("0"))
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buffer.WriteByte(' ')
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buffer.WriteString(offsetY.cssString("0"))
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buffer.WriteByte(' ')
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buffer.WriteString(blurRadius.cssString("0"))
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buffer.WriteByte(' ')
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buffer.WriteString(spreadRadius.cssString("0"))
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buffer.WriteByte(' ')
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buffer.WriteString(color.cssString())
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return true
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}
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func (shadow *viewShadowData) cssTextStyle(buffer *strings.Builder, session Session, lead string) bool {
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color, _ := colorProperty(shadow, ColorTag, session)
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offsetX, _ := sizeProperty(shadow, XOffset, session)
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offsetY, _ := sizeProperty(shadow, YOffset, session)
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blurRadius, _ := sizeProperty(shadow, BlurRadius, session)
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if color.Alpha() == 0 ||
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((offsetX.Type == Auto || offsetX.Value == 0) &&
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(offsetY.Type == Auto || offsetY.Value == 0) &&
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(blurRadius.Type == Auto || blurRadius.Value == 0)) {
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return false
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}
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buffer.WriteString(lead)
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buffer.WriteString(offsetX.cssString("0"))
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buffer.WriteByte(' ')
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buffer.WriteString(offsetY.cssString("0"))
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buffer.WriteByte(' ')
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buffer.WriteString(blurRadius.cssString("0"))
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buffer.WriteByte(' ')
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buffer.WriteString(color.cssString())
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return true
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}
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func (shadow *viewShadowData) visible(session Session) bool {
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color, _ := colorProperty(shadow, ColorTag, session)
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offsetX, _ := sizeProperty(shadow, XOffset, session)
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offsetY, _ := sizeProperty(shadow, YOffset, session)
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blurRadius, _ := sizeProperty(shadow, BlurRadius, session)
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spreadRadius, _ := sizeProperty(shadow, SpreadRadius, session)
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if color.Alpha() == 0 ||
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((offsetX.Type == Auto || offsetX.Value == 0) &&
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(offsetY.Type == Auto || offsetY.Value == 0) &&
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(blurRadius.Type == Auto || blurRadius.Value == 0) &&
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(spreadRadius.Type == Auto || spreadRadius.Value == 0)) {
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return false
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}
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return true
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}
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func (shadow *viewShadowData) String() string {
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return runStringWriter(shadow)
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}
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func (shadow *viewShadowData) writeString(buffer *strings.Builder, indent string) {
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buffer.WriteString("_{ ")
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comma := false
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for _, tag := range shadow.AllTags() {
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if value, ok := shadow.properties[tag]; ok {
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if comma {
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buffer.WriteString(", ")
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}
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buffer.WriteString(tag)
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buffer.WriteString(" = ")
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writePropertyValue(buffer, tag, value, indent)
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comma = true
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}
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}
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buffer.WriteString(" }")
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}
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func (properties *propertyList) setShadow(tag string, value interface{}) bool {
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if value == nil {
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delete(properties.properties, tag)
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return true
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}
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switch value := value.(type) {
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case ViewShadow:
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properties.properties[tag] = []ViewShadow{value}
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case []ViewShadow:
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if len(value) == 0 {
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delete(properties.properties, tag)
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} else {
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properties.properties[tag] = value
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}
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case DataValue:
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if !value.IsObject() {
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return false
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}
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properties.properties[tag] = []ViewShadow{parseViewShadow(value.Object())}
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case []DataValue:
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shadows := []ViewShadow{}
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for _, data := range value {
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if data.IsObject() {
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shadows = append(shadows, parseViewShadow(data.Object()))
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}
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}
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if len(shadows) == 0 {
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return false
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}
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properties.properties[tag] = shadows
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case string:
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obj := NewDataObject(value)
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if obj == nil {
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notCompatibleType(tag, value)
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return false
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}
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properties.properties[tag] = []ViewShadow{parseViewShadow(obj)}
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default:
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notCompatibleType(tag, value)
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return false
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}
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return true
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}
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func getShadows(properties Properties, tag string) []ViewShadow {
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if value := properties.Get(tag); value != nil {
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switch value := value.(type) {
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case []ViewShadow:
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return value
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case ViewShadow:
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return []ViewShadow{value}
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}
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}
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return []ViewShadow{}
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}
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func shadowCSS(properties Properties, tag string, session Session) string {
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shadows := getShadows(properties, tag)
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if len(shadows) == 0 {
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return ""
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}
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buffer := allocStringBuilder()
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defer freeStringBuilder(buffer)
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lead := ""
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if tag == Shadow {
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for _, shadow := range shadows {
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if shadow.cssStyle(buffer, session, lead) {
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lead = ", "
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}
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}
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} else {
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for _, shadow := range shadows {
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if shadow.cssTextStyle(buffer, session, lead) {
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lead = ", "
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}
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}
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}
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return buffer.String()
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}
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