App.vue 5.89 KB
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<template>
  <div id="q-app">
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    <q-layout view="hHh lpr fFf">
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      <Header v-if="config.headers.all"
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        :collectiontitle="collectiontitle"
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        :config="config"
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        :itemlabel="itemlabel"
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        :itemurls="itemurls"
        :manifests="manifests"
        :status="status"
      />

      <q-page-container>
        <router-view
          :collection="collection"
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          :config="config"
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          :contenturl="contenturl"
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          :fontsize="fontsize"
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          :imageurl="imageurl"
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          :itemlabel="itemlabel"
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          :language="itemlanguage"
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          :manifests="manifests"
          :request="request"
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          :status="status"
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          :tree="tree"
        />
      </q-page-container>
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      <Footer :standalone="config.standalone" />
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    </q-layout>
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  </div>
</template>

<script>
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import Header from '@/components/quasar-header.vue';
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import Footer from '@/components/quasar-footer.vue';
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export default {
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  name: 'Viewer',
  components: {
    Header,
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    Footer,
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  },
  data() {
    return {
      collection: {},
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      collectiontitle: '',
      contenturl: '',
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      config: {},
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      fontsize: 14,
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      imageurl: '',
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      itemlabel: '',
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      itemlanguage: '',
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      itemurl: '',
      itemurls: [],
      label: '',
      manifests: [],
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      status: {},
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      tree: [],
    };
  },
  methods: {
    async request(url, responsetype = 'json') {
      const response = await fetch(url);
      const data = await (responsetype === 'text' ? response.text() : response.json());

      return data;
    },
    getCollection(url) {
      this.request(url)
        .then((data) => {
          this.collection = data;
          this.label = this.getLabel(data);

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          this.tree.push(
            {
              children: [],
              handler: (node) => {
                this.$root.$emit('update-tree-knots', node.label);
              },
              label: this.label,
              'label-key': this.label,
              selectable: false,
            },
          );
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          if (Array.isArray(data.sequence)) {
            data.sequence.forEach((seq) => this.getManifest(seq.id));
          }
        });
    },
    getConfig() {
      this.config = JSON.parse(document.getElementById('emo-config').text);
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      if (Object.keys(this.config.panels).length) {
        this.status = this.config.panels;
      }
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    },
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    getItemData(url) {
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      this.request(url)
        .then((data) => {
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          this.collectiontitle = data.title;
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          this.contenturl = data.content;
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          this.imageurl = data.image && data.image.id ? data.image.id : '';
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          this.itemlabel = data.n ? data.n : 'No itemlabel :(';
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          this.itemlanguage = data.language;
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        });
    },
    getItemIndex(nodelabel) {
      let idx = 0;
      this.itemurls.forEach((item, index) => {
        if (item === nodelabel) {
          idx = index;
        }
      });
      return idx;
    },
    getItemUrls(sequence, label) {
      const urls = [];
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      let ctr = 0;
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      sequence.forEach((obj) => {
        urls.push(
          {
            label: obj.id,
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            'label-key': `${this.config.labels.item} ${ctr += 1}`,
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            handler: (node) => {
              if (this.itemurl === node.label) {
                return;
              }
              this.$root.$emit('update-item', node.label);
              this.$root.$emit('update-item-index', this.getItemIndex(node.label));
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              this.$root.$emit('update-sequence-index', this.getSequenceIndex(label));
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            },
          },
        );
      });
      return urls;
    },
    getLabel(data) {
      if (Object.keys(this.collection).length) {
        return data.title && data.title[0].title ? data.title[0].title : data.label;
      }
      return data.label ? data.label : 'Manifest <small>(No label available)</small>';
    },
    getManifest(url) {
      this.request(url)
        .then((data) => {
          if (!Array.isArray(data.sequence)) {
            data.sequence = [data.sequence];
          }

          if (data.sequence[0] !== 'undefined') {
            data.sequence.map((seq) => this.itemurls.push(seq.id));
          }
          this.manifests.push(data);

          this.tree[0].children.push(
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            {
              children: this.getItemUrls(data.sequence, data.label),
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              label: data.label,
              'label-key': data.label,
              handler: (node) => {
                this.$root.$emit('update-tree-knots', node.label);
              },
              selectable: false,
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            },
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          );

          if (!this.label) {
            this.label = this.getLabel(data);
          }
          // make sure that urls are set just once on init
          if (!this.itemurl && data.sequence[0]) {
            this.itemurl = data.sequence[0].id;
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            this.getItemData(data.sequence[0].id);
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          }
        });
    },
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    getSequenceIndex(label) {
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      let index = 0;
      this.manifests.forEach((manifest, idx) => {
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        if (manifest.label === label) {
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          index = idx;
        }
      });
      return index;
    },
    init() {
      return this.config.entrypoint.match(/collection.json\s?$/)
        ? this.getCollection(this.config.entrypoint)
        : this.getManifest(this.config.entrypoint);
    },
  },
  created() {
    this.getConfig();
    this.init();

    this.itemurls.sort((a, b) => a.localeCompare(b, undefined, { numeric: true }));
  },
  mounted() {
    this.$root.$on('update-item', (url) => {
      this.itemurl = url;
      this.$router.push({ query: { itemurl: url } });
      // NOTE: Set imageurl to an empty string. Otherwise, if there is no corresponding image,
      // the "preceding" image according to the "preceding" itemurl will be shown.
      this.imageurl = '';
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      this.getItemData(url);
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    });

    this.$root.$on('update-panel-status', (status) => {
      this.status = status;
    });
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    this.$root.$on('change-fontsize', (fontsize) => {
      this.fontsize = fontsize;
    });
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  },
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};
</script>