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