annotationView single forward/backward

[bwbohl]

The AnnotationView offers three view modes for annotation participants:

1. grid
2. single
3. list

Using digilib as an image server, when switching to singleView the backward and forward icons to flip through the facsimiles fail to load. Tries to load from /exist/apps/EdiromOnline/pix/annotPreviewForward.png

Using leaflet as an image server, when switching to singleView, loading backwards and forwardPNGs is not even triggered.

[bwbohl]

Also with digilib IIIF image-server the icons are not present. You can see that the should be there if you inspect the HTML:

<div class="annotView">
    <div class="previewArea">
        <div class="previewItem widthLimited" id="ext-gen6106" style="width: 100%; height: 100%;">
<!-- HERE -->
            <div class="stepLeft"></div>
            <div class="stepRight"></div>
<!-- HERE -->
            <div class="imgBox" id="ext-gen6107">
                <img src="[OMITTED]" class="previewImg">
                <input type="hidden" class="previewImgData" value="[object Object]" id="ext-gen6108">
            </div>
            <div class="label">null: Takte&nbsp;1&nbsp;bis&nbsp;14</div>
        </div>
    </div>
</div>

[bwbohl]

Apparently, the div:s are hidden via CSS with display:none;. Changing this makes them visible, but they don’t seem to have a functionality implemented.

They are created in
https://github.com/Edirom/Edirom-Online/blob/78d4d323a5f3c817a41b97bcbc0896e75b1b3d09/app/view/window/AnnotationView.js#L652-L659

Styling is done in
https://github.com/Edirom/Edirom-Online/blob/78d4d323a5f3c817a41b97bcbc0896e75b1b3d09/packages/eoTheme/sass/etc/annotation.scss#L323-L345

The presence of this functionality doesn’t seem critical to me; consequently, we could also drop it. Opinions @Edirom/edirom-online-developer ?