Ghost/ghost/admin/app/components/gh-editor-feature-image.hbs

<div
    class="gh-editor-feature-image-container"
    {{on "mouseover" (fn (mut this.isHovered) true)}}
    {{on "mouseleave" (fn (mut this.isHovered) false)}}
>
    <GhUploader
        @extensions={{this.imageExtensions}}
        @onComplete={{this.setUploadedImage}}
        as |uploader|
    >
        {{#unless @image}}
            <div
                class="gh-editor-feature-image-dropzone"
                {{on "dragover" this.dragOver}}
                {{on "dragleave" this.dragLeave}}
                {{on "drop" (fn this.drop uploader.setFiles)}}
            ></div>
        {{/unless}}

        {{#if this.canDrop}}
            <div class="gh-editor-feature-image-drop-indicator bg-green br-pill pe-none"></div>
        {{/if}}

        {{#if uploader.isUploading}}
            {{!-- upload in progress --}}
            {{uploader.progressBar}}
        {{else if uploader.errors}}
            {{!-- upload failed --}}
            {{#each uploader.errors as |error|}}
                <div class="gh-setting-error" data-test-error="feature-image">
                    {{or error.context error.message}}
                    <button type="button" class="ml2 b" {{on "click" uploader.cancel}}>Retry</button>
                </div>
            {{/each}}
        {{else if @image}}
            {{!-- image is present --}}
            <span class="gh-editor-feature-image-indicator" data-tooltip="A feature image is publicly visible to anyone">
                {{svg-jar "feature-image"}}
            </span>
            <div class="gh-editor-feature-image">
                <img src={{@image}}>
                <button type="button" class="image-delete" title="Delete image" {{on "click" @clearImage}}>
                    {{svg-jar "trash"}}
                </button>
            </div>
            <div class="flex justify-between align-center">
                {{#if this.isEditingAlt}}
                    <input
                        type="text"
                        placeholder="Add alt text to the feature image"
                        class="gh-editor-feature-image-alttext"
                        name="alt"
                        value={{@alt}}
                        {{autofocus}}
                        {{on "input" this.onAltInput}}
                    >
                {{else}}
                    <KoenigBasicHtmlInput
                        @html={{@caption}}
                        @placeholder={{if this.captionInputFocused "" "Add a caption to the feature image"}}
                        @class="gh-editor-feature-image-caption"
                        @name="caption"
                        @onChange={{@updateCaption}}
                        @onFocus={{fn (mut this.captionInputFocused) true}}
                        @onBlur={{fn (mut this.captionInputFocused) false}}
                    />
                {{/if}}
                <button
                    title="Toggle between editing alt text and caption"
                    class="h-100 pl1 pr1 ba br3 f8 sans-serif fw4 lh-title tracked-2 {{if this.isEditingAlt "bg-green b--green white" "bg-white b--midlightgrey midlightgrey"}}"
                    {{on "click" this.toggleAltEditing passive=true}}
                >
                    Alt
                </button>
            </div>
        {{else}}
            {{!-- no-image state --}}
            <div class="flex flex-row items-center {{if this.hideButton "invisible"}}">
                {{#if this.canDrop}}
                    <div class="gh-editor-feature-image-add-button"><span>Drop to upload feature image</span></div>
                {{else}}
                    <button type="button" class="gh-editor-feature-image-add-button" {{on "click" uploader.triggerFileDialog}}>{{svg-jar "plus"}}<span>Add feature image</span></button>
                    {{#if this.settings.unsplash}}
                        <button type="button" class="gh-editor-feature-image-unsplash" {{on "click" this.toggleUnsplashSelector}}>{{svg-jar "unsplash"}}</button>
                    {{/if}}
                {{/if}}
            </div>
        {{/if}}

        <div style="display:none">
            <GhFileInput
                @multiple={{false}}
                @action={{uploader.setFiles}}
                @accept={{uploader.imageMimeTypes}}
                @onInsert={{uploader.registerFileInput}}
                data-test-file-input="feature-image" />
        </div>
    </GhUploader>
</div>

{{#if this.showUnsplashSelector}}
    <GhUnsplash
        @select={{this.setUnsplashImage}}
        @close={{this.toggleUnsplashSelector}}
    />
{{/if}}