viewer: migrate to vue 3, general refactoring and cleanup

Non-exhaustive list of fixes and improvements done at the same time:

- html default background to grey (avoids white flash during init)
- unified links behavior
- added more theme variables
- removed the flex-expand transition (it wasn't working) and replaced it
  with a slide
- fixed LdLoading not centered on the content
- title on removable tags
- fixed an issue with encoded URI from vue-router
- unified Item resource URLs
- removed the iframe for PlainTextViewer (it wasn't working properly)
  and replaced it with a pre
- fixed clear and search buttons tabindex
- fixed the information panel bumping up during the fade animation of
  tag's dropdown
- fixed some focus outlines not appearing correctly
- moved CSS variables to the :root context
- Code cleaning

GitHub: closes #217
GitHub: closes #300
GitHub: closes #297
GitHub: closes #105
GitHub: closes #267
GitHub: closes #275
GitHub: closes #228
GitHub: closes #215
GitHub: closes #112

1 files changed, 50 insertions, 0 deletions

diff --git a/viewer/src/views/item_handlers/MarkdownViewer.vue b/viewer/src/views/item_handlers/MarkdownViewer.vue
new file mode 100644
index 0000000..d5ac7e2
--- /dev/null
+++ b/viewer/src/views/item_handlers/MarkdownViewer.vue
@@ -0,0 +1,50 @@
+<!--
+-- ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2021  Guillaume FOUET
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU Affero General Public License as
+-- published by the Free Software Foundation, either version 3 of the
+-- License, or (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU Affero General Public License for more details.
+--
+-- You should have received a copy of the GNU Affero General Public License
+-- along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<template>
+  <LdLoading v-if="isFetching" />
+  <LdMarkdown
+    v-else-if="!error && data"
+    :class="$style.container"
+    :markdown="data"
+  />
+</template>
+
+<script setup lang="ts">
+import { MarkdownItem } from '@/@types/gallery';
+import { LdMarkdown } from '@/components/async';
+import LdLoading from '@/components/LdLoading.vue';
+import { useLdFetch } from '@/services/api/ldFetch';
+import { useItemResource } from '@/services/ui/ldItemResourceUrl';
+import { PropType } from 'vue';
+
+const props = defineProps({
+  item: { type: Object as PropType<MarkdownItem>, required: true },
+});
+
+const { itemResourceUrl } = useItemResource(props.item);
+const { isFetching, data, error } = useLdFetch(itemResourceUrl).text();
+</script>
+
+<style lang="scss" module>
+.container {
+  padding: 8px;
+}
+</style>