forked from mbk-lab/rui_orig
2
0
Fork 0
rui/imageView.go

275 lines
7.9 KiB
Go
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

package rui
import (
"fmt"
"strings"
)
const (
// NoneFit - value of the "object-fit" property of an ImageView. The replaced content is not resized
NoneFit = 0
// ContainFit - value of the "object-fit" property of an ImageView. The replaced content
// is scaled to maintain its aspect ratio while fitting within the elements content box.
// The entire object is made to fill the box, while preserving its aspect ratio, so the object
// will be "letterboxed" if its aspect ratio does not match the aspect ratio of the box.
ContainFit = 1
// CoverFit - value of the "object-fit" property of an ImageView. The replaced content
// is sized to maintain its aspect ratio while filling the elements entire content box.
// If the object's aspect ratio does not match the aspect ratio of its box, then the object will be clipped to fit.
CoverFit = 2
// FillFit - value of the "object-fit" property of an ImageView. The replaced content is sized
// to fill the elements content box. The entire object will completely fill the box.
// If the object's aspect ratio does not match the aspect ratio of its box, then the object will be stretched to fit.
FillFit = 3
// ScaleDownFit - value of the "object-fit" property of an ImageView. The content is sized as
// if NoneFit or ContainFit were specified, whichever would result in a smaller concrete object size.
ScaleDownFit = 4
)
// ImageView - image View
type ImageView interface {
View
}
type imageViewData struct {
viewData
}
// NewImageView create new ImageView object and return it
func NewImageView(session Session, params Params) ImageView {
view := new(imageViewData)
view.Init(session)
setInitParams(view, params)
return view
}
func newImageView(session Session) View {
return NewImageView(session, nil)
}
// Init initialize fields of imageView by default values
func (imageView *imageViewData) Init(session Session) {
imageView.viewData.Init(session)
imageView.tag = "ImageView"
//imageView.systemClass = "ruiImageView"
}
func (imageView *imageViewData) normalizeTag(tag string) string {
tag = strings.ToLower(tag)
switch tag {
case "source":
tag = Source
case VerticalAlign:
tag = ImageVerticalAlign
case HorizontalAlign:
tag = ImageHorizontalAlign
case altTag:
tag = AltText
}
return tag
}
func (imageView *imageViewData) Remove(tag string) {
imageView.remove(imageView.normalizeTag(tag))
}
func (imageView *imageViewData) remove(tag string) {
imageView.viewData.remove(tag)
if imageView.created {
switch tag {
case Source:
updateProperty(imageView.htmlID(), "src", "", imageView.session)
removeProperty(imageView.htmlID(), "srcset", imageView.session)
case AltText:
updateInnerHTML(imageView.htmlID(), imageView.session)
case ImageVerticalAlign, ImageHorizontalAlign:
updateCSSStyle(imageView.htmlID(), imageView.session)
}
}
}
func (imageView *imageViewData) Set(tag string, value interface{}) bool {
return imageView.set(imageView.normalizeTag(tag), value)
}
func (imageView *imageViewData) set(tag string, value interface{}) bool {
if value == nil {
imageView.remove(tag)
return true
}
switch tag {
case Source:
if text, ok := value.(string); ok {
imageView.properties[Source] = text
if imageView.created {
updateProperty(imageView.htmlID(), "src", text, imageView.session)
if srcset := imageView.srcSet(text); srcset != "" {
updateProperty(imageView.htmlID(), "srcset", srcset, imageView.session)
} else {
removeProperty(imageView.htmlID(), "srcset", imageView.session)
}
}
imageView.propertyChangedEvent(Source)
return true
}
notCompatibleType(Source, value)
case AltText:
if text, ok := value.(string); ok {
imageView.properties[AltText] = text
if imageView.created {
updateInnerHTML(imageView.htmlID(), imageView.session)
}
imageView.propertyChangedEvent(Source)
return true
}
notCompatibleType(tag, value)
default:
if imageView.viewData.set(tag, value) {
if imageView.created {
switch tag {
case ImageVerticalAlign, ImageHorizontalAlign:
updateCSSStyle(imageView.htmlID(), imageView.session)
}
}
return true
}
}
return false
}
func (imageView *imageViewData) Get(tag string) interface{} {
return imageView.viewData.get(imageView.normalizeTag(tag))
}
func (imageView *imageViewData) srcSet(path string) string {
if srcset, ok := resources.imageSrcSets[path]; ok {
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
for i, src := range srcset {
if i > 0 {
buffer.WriteString(", ")
}
buffer.WriteString(src.path)
buffer.WriteString(fmt.Sprintf(" %gx", src.scale))
}
return buffer.String()
}
return ""
}
func (imageView *imageViewData) htmlTag() string {
return "img"
}
/*
func (imageView *imageViewData) closeHTMLTag() bool {
return false
}
*/
func (imageView *imageViewData) htmlProperties(self View, buffer *strings.Builder) {
imageView.viewData.htmlProperties(self, buffer)
imageResource := GetImageViewSource(imageView, "")
if imageResource != "" {
buffer.WriteString(` src="`)
buffer.WriteString(imageResource)
buffer.WriteString(`"`)
if srcset := imageView.srcSet(imageResource); srcset != "" {
buffer.WriteString(` srcset="`)
buffer.WriteString(srcset)
buffer.WriteString(`"`)
}
}
}
func (imageView *imageViewData) cssStyle(self View, builder cssBuilder) {
imageView.viewData.cssStyle(self, builder)
if value, ok := enumProperty(imageView, Fit, imageView.session, 0); ok {
builder.add("object-fit", enumProperties[Fit].cssValues[value])
} else {
builder.add("object-fit", "none")
}
vAlign := GetImageViewVerticalAlign(imageView, "")
hAlign := GetImageViewHorizontalAlign(imageView, "")
if vAlign != CenterAlign || hAlign != CenterAlign {
var position string
switch hAlign {
case LeftAlign:
position = "left"
case RightAlign:
position = "right"
default:
position = "center"
}
switch vAlign {
case TopAlign:
position += " top"
case BottomAlign:
position += " bottom"
default:
position += " center"
}
builder.add("object-position", position)
}
}
// GetImageViewSource returns the image URL of an ImageView subview.
// If the second argument (subviewID) is "" then a left position of the first argument (view) is returned
func GetImageViewSource(view View, subviewID string) string {
if image, ok := stringProperty(view, Source, view.Session()); ok {
return image
}
return ""
}
// GetImageViewAltText returns an alternative text description of an ImageView subview.
// If the second argument (subviewID) is "" then a left position of the first argument (view) is returned
func GetImageViewAltText(view View, subviewID string) string {
if text, ok := stringProperty(view, AltText, view.Session()); ok {
return text
}
return ""
}
// GetImageViewFit returns how the content of a replaced ImageView subview:
// NoneFit (0), ContainFit (1), CoverFit (2), FillFit (3), or ScaleDownFit (4).
// If the second argument (subviewID) is "" then a left position of the first argument (view) is returned
func GetImageViewFit(view View, subviewID string) int {
if value, ok := enumProperty(view, Fit, view.Session(), 0); ok {
return value
}
return 0
}
// GetImageViewVerticalAlign return the vertical align of an ImageView subview: TopAlign (0), BottomAlign (1), CenterAlign (2)
// If the second argument (subviewID) is "" then a left position of the first argument (view) is returned
func GetImageViewVerticalAlign(view View, subviewID string) int {
if align, ok := enumProperty(view, ImageVerticalAlign, view.Session(), LeftAlign); ok {
return align
}
return CenterAlign
}
// GetImageViewHorizontalAlign return the vertical align of an ImageView subview: LeftAlign (0), RightAlign (1), CenterAlign (2)
// If the second argument (subviewID) is "" then a left position of the first argument (view) is returned
func GetImageViewHorizontalAlign(view View, subviewID string) int {
if align, ok := enumProperty(view, ImageHorizontalAlign, view.Session(), LeftAlign); ok {
return align
}
return CenterAlign
}