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preload images and identifications
This commit is contained in:
thomas girod
parent
a2a858262a
commit
813bbbb94a
@ -4,23 +4,78 @@
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* @property {UserProfile} user The identified user
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*/
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/**
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* A container for a picture with the users identified on it
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* able to prefetch its data.
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*/
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class PictureWithIdentifications {
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identifications = null;
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image_loading = false;
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identifications_loading = false;
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/**
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* @param {Picture} picture
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*/
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constructor(picture) {
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Object.assign(this, picture);
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}
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/**
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* @param {Picture} picture
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*/
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static from_picture(picture) {
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return new PictureWithIdentifications(picture);
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}
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/**
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* If not already done, fetch the users identified on this picture and
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* populate the identifications field
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* @param {?Object=} options
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* @return {Promise<void>}
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*/
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async load_identifications(options) {
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if (this.identifications_loading) {
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return; // The users are already being fetched.
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}
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if (!!this.identifications && !options?.force_reload) {
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// The users are already fetched
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// and the user does not want to force the reload
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return;
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}
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this.identifications_loading = true;
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const url = `/api/sas/picture/${this.id}/identified`;
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this.identifications = await (await fetch(url)).json();
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this.identifications_loading = false;
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}
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/**
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* Preload the photo and the identifications
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* @return {Promise<void>}
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*/
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async preload() {
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const img = new Image();
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img.src = this.compressed_url;
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if (!img.complete) {
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this.image_loading = true;
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img.addEventListener("load", () => {
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this.image_loading = false;
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});
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}
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await this.load_identifications();
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}
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}
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document.addEventListener("alpine:init", () => {
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Alpine.data("picture_viewer", () => ({
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/**
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* All the pictures that can be displayed on this picture viewer
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* @type Picture[]
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* @type PictureWithIdentifications[]
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**/
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pictures: [],
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/**
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* The users identified on the currently displayed picture
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* @type PictureIdentification[]
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**/
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identifications: [],
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/**
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* The currently displayed picture
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* Default dummy data are pre-loaded to avoid javascript error
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* when loading the page at the beginning
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* @type Picture
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* @type PictureWithIdentifications
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**/
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current_picture: {
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is_moderated: true,
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@ -32,15 +87,16 @@ document.addEventListener("alpine:init", () => {
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full_size_url: "",
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owner: "",
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date: new Date(),
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identifications: [],
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},
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/**
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* The picture which will be displayed next if the user press the "next" button
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* @type ?Picture
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* @type ?PictureWithIdentifications
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**/
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next_picture: null,
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/**
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* The picture which will be displayed next if the user press the "previous" button
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* @type ?Picture
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* @type ?PictureWithIdentifications
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**/
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previous_picture: null,
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/**
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@ -50,7 +106,6 @@ document.addEventListener("alpine:init", () => {
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/**
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* true if the page is in a loading state, else false
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**/
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loading: true,
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/**
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* Error message when a moderation operation fails
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* @type string
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@ -64,11 +119,17 @@ document.addEventListener("alpine:init", () => {
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pushstate: History.PUSH,
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async init() {
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this.pictures = await fetch_paginated(picture_endpoint);
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this.pictures = (await fetch_paginated(picture_endpoint)).map(
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PictureWithIdentifications.from_picture,
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);
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this.selector = sithSelect2({
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element: $(this.$refs.search),
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data_source: remote_data_source("/api/user/search", {
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excluded: () => [...this.identifications.map((i) => i.user.id)],
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excluded: () => [
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...(this.current_picture.identifications || []).map(
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(i) => i.user.id,
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),
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],
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result_converter: (obj) => Object({ ...obj, text: obj.display_name }),
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}),
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picture_getter: (user) => user.profile_pict,
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@ -99,8 +160,6 @@ document.addEventListener("alpine:init", () => {
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* the list of identified users are updated.
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*/
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async update_picture() {
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this.loading = true;
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const update_args = [
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{ sas_picture_id: this.current_picture.id },
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"",
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@ -117,10 +176,13 @@ document.addEventListener("alpine:init", () => {
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const index = this.pictures.indexOf(this.current_picture);
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this.previous_picture = this.pictures[index - 1] || null;
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this.next_picture = this.pictures[index + 1] || null;
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this.identifications = await (
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await fetch(`/api/sas/picture/${this.current_picture.id}/identified`)
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).json();
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this.loading = false;
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await this.current_picture.load_identifications();
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this.$refs.main_picture?.addEventListener("load", () => {
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// once the current picture is loaded,
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// start preloading the next and previous pictures
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this.next_picture?.preload();
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this.previous_picture?.preload();
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});
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},
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async moderate_picture() {
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@ -131,8 +193,7 @@ document.addEventListener("alpine:init", () => {
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},
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);
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if (!res.ok) {
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this.moderation_error =
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gettext("Couldn't moderate picture") + " : " + res.statusText;
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this.moderation_error = `${gettext("Couldn't moderate picture")} : ${res.statusText}`;
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return;
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}
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this.current_picture.is_moderated = true;
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@ -161,16 +222,14 @@ document.addEventListener("alpine:init", () => {
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* Send the identification request and update the list of identified users.
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*/
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async submit_identification() {
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this.loading = true;
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const url = `/api/sas/picture/${this.current_picture.id}/identified`;
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await fetch(url, {
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method: "PUT",
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body: JSON.stringify(this.selector.val().map((i) => parseInt(i))),
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});
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// refresh the identified users list
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this.identifications = await (await fetch(url)).json();
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await this.current_picture.load_identifications({ force_reload: true });
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this.selector.empty().trigger("change");
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this.loading = false;
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},
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/**
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@ -187,16 +246,15 @@ document.addEventListener("alpine:init", () => {
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* @param {PictureIdentification} identification
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*/
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async remove_identification(identification) {
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this.loading = true;
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const res = await fetch(`/api/sas/relation/${identification.id}`, {
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method: "DELETE",
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});
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if (res.ok) {
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this.identifications = this.identifications.filter(
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if (res.ok && Array.isArray(this.current_picture.identifications)) {
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this.current_picture.identifications =
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this.current_picture.identifications.filter(
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(i) => i.id !== identification.id,
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);
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}
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this.loading = false;
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},
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}));
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});
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@ -58,8 +58,13 @@
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<div class="container" id="pict">
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<div class="main">
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<div class="photo" :aria-busy="loading">
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<img :src="current_picture.compressed_url" :alt="current_picture.name"/>
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<div class="photo" :aria-busy="current_picture.image_loading">
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<img
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:src="current_picture.compressed_url"
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:alt="current_picture.name"
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id="main-picture"
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x-ref="main_picture"
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/>
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</div>
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<div class="general">
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@ -137,7 +142,10 @@
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</form>
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{% endif %}
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<ul>
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<template x-for="identification in identifications" :key="identification.id">
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<template
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x-for="identification in (current_picture.identifications || [])"
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:key="identification.id"
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>
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<li>
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<a class="user" :href="identification.user.profile_url">
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<img class="profile-pic" :src="identification.user.profile_pict" alt="image de profil"/>
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@ -148,7 +156,7 @@
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</template>
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</li>
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</template>
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<template x-if="loading">
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<template x-if="current_picture.identifications_loading">
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{# shadow element that exists only to put the loading wheel below
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the list of identified people #}
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<li class="loader" aria-busy="true"></li>
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