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, 129 insertions, 0 deletions

diff --git a/viewer/src/@types/gallery.ts b/viewer/src/@types/gallery.ts
new file mode 100644
index 0000000..8c0f177
--- /dev/null
+++ b/viewer/src/@types/gallery.ts
@@ -0,0 +1,129 @@
+/* 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/>.
+*/
+
+import { ItemType } from './itemType';
+import { SplashScreenConfig } from './splashscreen';
+
+export type ItemSortStr = 'title_asc' | 'date_asc' | 'date_desc';
+
+export interface Config {
+  galleryRoot: string;
+  galleryIndex?: string;
+  initialItemSort?: ItemSortStr;
+  initialTagDisplayLimit?: number;
+  splashScreen?: SplashScreenConfig;
+}
+
+// ---
+
+export interface Resolution {
+  width: number;
+  height: number;
+}
+export interface Thumbnail {
+  resource: string;
+  resolution: Resolution;
+}
+export type RawTag = string;
+
+// ---
+
+export interface Downloadable {
+  resource: string;
+  type: ItemType; // unknown
+}
+export interface OtherProperties extends Downloadable {
+  type: ItemType.OTHER;
+}
+export interface PictureProperties extends Downloadable {
+  type: ItemType.PICTURE;
+  resolution: Resolution;
+}
+export interface PlainTextProperties extends Downloadable {
+  type: ItemType.PLAINTEXT;
+}
+export interface MarkdownProperties extends Downloadable {
+  type: ItemType.MARKDOWN;
+}
+export interface PDFProperties extends Downloadable {
+  type: ItemType.PDF;
+}
+export interface VideoProperties extends Downloadable {
+  type: ItemType.VIDEO;
+}
+export interface AudioProperties extends Downloadable {
+  type: ItemType.AUDIO;
+}
+export interface DirectoryProperties {
+  type: ItemType.DIRECTORY;
+  // eslint-disable-next-line no-use-before-define
+  items: Item[];
+}
+
+// ---
+
+export interface Item {
+  title: string;
+  datetime: string;
+  description: string;
+  tags: RawTag[];
+  path: string;
+  thumbnail?: Thumbnail;
+  properties:
+    | Downloadable
+    | DirectoryProperties;
+}
+export interface DownloadableItem extends Item { // Special unknown item type
+  properties: Downloadable;
+}
+export interface OtherItem extends Item {
+  properties: OtherProperties;
+}
+export interface PictureItem extends Item {
+  properties: PictureProperties;
+}
+export interface PlainTextItem extends Item {
+  properties: PlainTextProperties;
+}
+export interface MarkdownItem extends Item {
+  properties: MarkdownProperties;
+}
+export interface PDFItem extends Item {
+  properties: PDFProperties;
+}
+export interface VideoItem extends Item {
+  properties: VideoProperties;
+}
+export interface AudioItem extends Item {
+  properties: AudioProperties;
+}
+export interface DirectoryItem extends Item {
+  properties: DirectoryProperties;
+}
+
+// ---
+
+export interface IndexProperties {
+  galleryTitle: string;
+  tagCategories: RawTag[];
+}
+export interface Index {
+  properties: IndexProperties;
+  tree: DirectoryItem;
+}