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