mirror of https://github.com/anoshenko/rui.git
306 lines
9.3 KiB
Go
306 lines
9.3 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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// Blur is the constant for the "blur" property tag of the ViewFilter interface.
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// The "blur" float64 property applies a Gaussian blur. The value of radius defines the value
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// of the standard deviation to the Gaussian function, or how many pixels on the screen blend
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// into each other, so a larger value will create more blur. The lacuna value for interpolation is 0.
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// The parameter is specified as a length in pixels.
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Blur = "blur"
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// Brightness is the constant for the "brightness" property tag of the ViewFilter interface.
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// The "brightness" float64 property applies a linear multiplier to input image, making it appear more
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// or less bright. A value of 0% will create an image that is completely black.
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// A value of 100% leaves the input unchanged. Other values are linear multipliers on the effect.
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// Values of an amount over 100% are allowed, providing brighter results.
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Brightness = "brightness"
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// Contrast is the constant for the "contrast" property tag of the ViewFilter interface.
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// The "contrast" float64 property adjusts the contrast of the input.
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// A value of 0% will create an image that is completely black. A value of 100% leaves the input unchanged.
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// Values of amount over 100% are allowed, providing results with less contrast.
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Contrast = "contrast"
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// DropShadow is the constant for the "drop-shadow" property tag of the ViewFilter interface.
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// The "drop-shadow" property applies a drop shadow effect to the input image.
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// A drop shadow is effectively a blurred, offset version of the input image's alpha mask
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// drawn in a particular color, composited below the image.
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// Shadow parameters are set using the ViewShadow interface
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DropShadow = "drop-shadow"
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// Grayscale is the constant for the "grayscale" property tag of the ViewFilter interface.
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// The "grayscale" float64 property converts the input image to grayscale.
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// The value of ‘amount’ defines the proportion of the conversion.
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// A value of 100% is completely grayscale. A value of 0% leaves the input unchanged.
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// Values between 0% and 100% are linear multipliers on the effect.
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Grayscale = "grayscale"
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// HueRotate is the constant for the "hue-rotate" property tag of the ViewFilter interface.
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// The "hue-rotate" AngleUnit property applies a hue rotation on the input image.
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// The value of ‘angle’ defines the number of degrees around the color circle the input samples will be adjusted.
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// A value of 0deg leaves the input unchanged. If the ‘angle’ parameter is missing, a value of 0deg is used.
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// Though there is no maximum value, the effect of values above 360deg wraps around.
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HueRotate = "hue-rotate"
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// Invert is the constant for the "invert" property tag of the ViewFilter interface.
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// The "invert" float64 property inverts the samples in the input image.
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// The value of ‘amount’ defines the proportion of the conversion.
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// A value of 100% is completely inverted. A value of 0% leaves the input unchanged.
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// Values between 0% and 100% are linear multipliers on the effect.
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Invert = "invert"
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// Saturate is the constant for the "saturate" property tag of the ViewFilter interface.
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// The "saturate" float64 property saturates the input image.
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// The value of ‘amount’ defines the proportion of the conversion.
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// A value of 0% is completely un-saturated. A value of 100% leaves the input unchanged.
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// Other values are linear multipliers on the effect.
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// Values of amount over 100% are allowed, providing super-saturated results.
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Saturate = "saturate"
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// Sepia is the constant for the "sepia" property tag of the ViewFilter interface.
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// The "sepia" float64 property converts the input image to sepia.
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// The value of ‘amount’ defines the proportion of the conversion.
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// A value of 100% is completely sepia. A value of 0% leaves the input unchanged.
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// Values between 0% and 100% are linear multipliers on the effect.
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Sepia = "sepia"
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//Opacity = "opacity"
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)
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// ViewFilter defines an applied to a View a graphical effects like blur or color shift.
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// Allowable properties are Blur, Brightness, Contrast, DropShadow, Grayscale, HueRotate, Invert, Opacity, Saturate, and Sepia
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type ViewFilter interface {
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Properties
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fmt.Stringer
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stringWriter
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cssStyle(session Session) string
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}
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type viewFilter struct {
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propertyList
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}
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// NewViewFilter creates the new ViewFilter
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func NewViewFilter(params Params) ViewFilter {
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if params != nil {
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filter := new(viewFilter)
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filter.init()
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for tag, value := range params {
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filter.Set(tag, value)
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}
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if len(filter.properties) > 0 {
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return filter
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}
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}
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return nil
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}
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func newViewFilter(obj DataObject) ViewFilter {
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filter := new(viewFilter)
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filter.init()
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for i := 0; i < obj.PropertyCount(); i++ {
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if node := obj.Property(i); node != nil {
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tag := node.Tag()
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switch node.Type() {
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case TextNode:
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filter.Set(tag, node.Text())
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case ObjectNode:
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if tag == HueRotate {
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// TODO
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} else {
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ErrorLog(`Invalid value of "` + tag + `"`)
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}
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default:
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ErrorLog(`Invalid value of "` + tag + `"`)
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}
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}
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}
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if len(filter.properties) > 0 {
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return filter
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}
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ErrorLog("Empty view filter")
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return nil
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}
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func (filter *viewFilter) Set(tag string, value any) bool {
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if value == nil {
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filter.Remove(tag)
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return true
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}
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switch strings.ToLower(tag) {
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case Blur, Brightness, Contrast, Saturate:
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return filter.setFloatProperty(tag, value, 0, 10000)
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case Grayscale, Invert, Opacity, Sepia:
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return filter.setFloatProperty(tag, value, 0, 100)
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case HueRotate:
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return filter.setAngleProperty(tag, value)
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case DropShadow:
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return filter.setShadow(tag, value)
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}
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ErrorLogF(`"%s" property is not supported by the view filter`, tag)
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return false
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}
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func (filter *viewFilter) String() string {
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return runStringWriter(filter)
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}
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func (filter *viewFilter) writeString(buffer *strings.Builder, indent string) {
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buffer.WriteString("filter { ")
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comma := false
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tags := filter.AllTags()
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for _, tag := range tags {
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if value, ok := filter.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 (filter *viewFilter) cssStyle(session Session) string {
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buffer := allocStringBuilder()
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defer freeStringBuilder(buffer)
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if value, ok := floatTextProperty(filter, Blur, session, 0); ok {
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buffer.WriteString(Blur)
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buffer.WriteRune('(')
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buffer.WriteString(value)
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buffer.WriteString("px)")
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}
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for _, tag := range []string{Brightness, Contrast, Saturate, Grayscale, Invert, Opacity, Sepia} {
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if value, ok := floatTextProperty(filter, tag, session, 0); ok {
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if buffer.Len() > 0 {
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buffer.WriteRune(' ')
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}
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buffer.WriteString(tag)
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buffer.WriteRune('(')
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buffer.WriteString(value)
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buffer.WriteString("%)")
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}
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}
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if value, ok := angleProperty(filter, HueRotate, session); ok {
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if buffer.Len() > 0 {
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buffer.WriteRune(' ')
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}
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buffer.WriteString(HueRotate)
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buffer.WriteRune('(')
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buffer.WriteString(value.cssString())
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buffer.WriteRune(')')
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}
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var lead string
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if buffer.Len() > 0 {
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lead = " drop-shadow("
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} else {
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lead = "drop-shadow("
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}
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for _, shadow := range getShadows(filter, DropShadow) {
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if shadow.cssTextStyle(buffer, session, lead) {
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buffer.WriteRune(')')
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lead = " drop-shadow("
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}
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}
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return buffer.String()
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}
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func (style *viewStyle) setFilter(tag string, value any) bool {
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switch value := value.(type) {
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case ViewFilter:
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style.properties[tag] = value
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return true
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case string:
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if obj := NewDataObject(value); obj == nil {
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if filter := newViewFilter(obj); filter != nil {
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style.properties[tag] = filter
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return true
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}
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}
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case DataObject:
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if filter := newViewFilter(value); filter != nil {
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style.properties[tag] = filter
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return true
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}
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case DataValue:
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if value.IsObject() {
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if filter := newViewFilter(value.Object()); filter != nil {
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style.properties[tag] = filter
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return true
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}
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}
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}
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notCompatibleType(tag, value)
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return false
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}
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// GetFilter returns a View graphical effects like blur or color shift.
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// If the second argument (subviewID) is not specified or it is "" then a top position of the first argument (view) is returned
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func GetFilter(view View, subviewID ...string) ViewFilter {
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if len(subviewID) > 0 && subviewID[0] != "" {
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view = ViewByID(view, subviewID[0])
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}
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if view != nil {
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if value := view.getRaw(Filter); value != nil {
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if filter, ok := value.(ViewFilter); ok {
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return filter
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}
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}
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if value := valueFromStyle(view, Filter); value != nil {
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if filter, ok := value.(ViewFilter); ok {
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return filter
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}
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}
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}
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return nil
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}
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// GetBackdropFilter returns the area behind a View graphical effects like blur or color shift.
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// If the second argument (subviewID) is not specified or it is "" then a top position of the first argument (view) is returned
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func GetBackdropFilter(view View, subviewID ...string) ViewFilter {
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if len(subviewID) > 0 && subviewID[0] != "" {
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view = ViewByID(view, subviewID[0])
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}
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if view != nil {
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if value := view.getRaw(BackdropFilter); value != nil {
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if filter, ok := value.(ViewFilter); ok {
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return filter
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}
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}
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if value := valueFromStyle(view, BackdropFilter); value != nil {
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if filter, ok := value.(ViewFilter); ok {
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return filter
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}
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}
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}
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return nil
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}
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