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, 64 insertions, 0 deletions

diff --git a/viewer/src/views/layout/left/LayoutCommandSearch.vue b/viewer/src/views/layout/left/LayoutCommandSearch.vue
new file mode 100644
index 0000000..ab31a84
--- /dev/null
+++ b/viewer/src/views/layout/left/LayoutCommandSearch.vue
@@ -0,0 +1,64 @@
+<!-- ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2019-2022  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>
+  <div
+    class="flex"
+    :class="[$style.commands, $style.webkitFlexShrinkFix]"
+  >
+    <button
+      tabindex="60"
+      @click="emit('clear')"
+    >
+      <fa-icon :icon="faEraser" />
+      <span>{{ t("command.search.clear") }}</span>
+    </button>
+    <button
+      tabindex="61"
+      class="flex-grow-1"
+      @click="emit('search')"
+    >
+      <fa-icon :icon="faSearch" />
+      <span>{{ t("command.search.search") }}</span>
+    </button>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { faEraser, faSearch } from '@fortawesome/free-solid-svg-icons';
+import { useI18n } from 'vue-i18n';
+
+const emit = defineEmits(['clear', 'search']);
+
+const { t } = useI18n();
+</script>
+
+<style lang="scss" module>
+// fix flexbox shrinking and overlap in old webkit versions
+// https://github.com/pacien/ldgallery/issues/183
+.webkitFlexShrinkFix {
+  flex: none;
+}
+
+.commands {
+  span {
+    margin-left: 0.5rem;
+  }
+}
+</style>