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<script>
import { GlDisclosureDropdown } from '@gitlab/ui';
function getHeaderNumber(el) {
return parseInt(el.tagName.match(/\d+/)[0], 10);
}
export default {
components: {
GlDisclosureDropdown,
},
data() {
return {
isHidden: false,
items: [],
};
},
mounted() {
this.blobViewer = document.querySelector('.blob-viewer[data-type="rich"]');
const blobViewerAttr = (attr) => this.blobViewer.getAttribute(attr);
this.observer = new MutationObserver(() => {
if (this.blobViewer.classList.contains('hidden') || blobViewerAttr('data-type') !== 'rich') {
this.isHidden = true;
} else if (blobViewerAttr('data-loaded') === 'true') {
this.isHidden = false;
this.generateHeaders();
this.observer.disconnect();
}
});
if (this.blobViewer) {
this.observer.observe(this.blobViewer, {
attributes: true,
});
}
},
beforeDestroy() {
if (this.observer) {
this.observer.disconnect();
}
},
methods: {
generateHeaders() {
const BASE_PADDING = 16;
const headers = [...this.blobViewer.querySelectorAll('h1,h2,h3,h4,h5,h6')];
if (headers.length === 0) {
return;
}
const firstHeader = getHeaderNumber(headers[0]);
this.items = headers.map((el) => ({
text: el.textContent.trim(),
href: `#${el.querySelector('a').getAttribute('id')}`,
extraAttrs: {
style: {
paddingLeft: `${BASE_PADDING + Math.max((getHeaderNumber(el) - firstHeader) * 8, 0)}px`,
},
},
}));
},
},
};
</script>
<template>
<gl-disclosure-dropdown
v-if="!isHidden && items.length"
icon="list-bulleted"
class="gl-mr-2"
:items="items"
/>
</template>
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