210 lines
6.6 KiB
JavaScript
210 lines
6.6 KiB
JavaScript
"use strict";
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const $ = require("jquery");
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const options = require("./options");
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const socket = require("./socket");
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const templates = require("../views");
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const chat = $("#chat");
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const input = $("#input");
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const Mousetrap = require("mousetrap");
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module.exports = renderPreview;
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function renderPreview(preview, msg) {
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if (preview.type === "loading") {
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return;
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}
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preview.shown = preview.shown && options.shouldOpenMessagePreview(preview.type);
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const template = $(templates.msg_preview({preview: preview}));
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const image = template.find("img:first");
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if (image.length === 0) {
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return appendPreview(preview, msg, template);
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}
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// If there is an image in preview, wait for it to load before appending it to DOM
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// This is done to prevent problems keeping scroll to the bottom while images load
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image.on("load", () => appendPreview(preview, msg, template));
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// If the image fails to load, remove it from DOM and still render the preview
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if (preview.type === "link") {
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image.on("abort error", () => {
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image.parent().remove();
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appendPreview(preview, msg, template);
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});
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}
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}
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function appendPreview(preview, msg, template) {
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const escapedLink = preview.link.replace(/["\\]/g, "\\$&");
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const previewContainer = msg.find(`.preview[data-url="${escapedLink}"]`);
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// This is to fix a very rare case of rendering a preview twice
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// This happens when a very large amount of messages is being sent to the client
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// and they get queued, so the `preview` object on the server has time to load before
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// it actually gets sent to the server, which makes the loaded preview sent twice,
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// once in `msg` and another in `msg:preview`
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if (!previewContainer.is(":empty")) {
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return;
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}
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const container = msg.closest(".messages");
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const channelId = container.closest(".chan").data("id") || -1;
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const activeChannelId = chat.find(".chan.active").data("id") || -2;
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msg.find(`.text a[href="${escapedLink}"]`)
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.first()
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.after(templates.msg_preview_toggle({preview: preview}).trim());
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previewContainer.append(template);
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if (activeChannelId === channelId) {
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container.trigger("keepToBottom");
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}
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}
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$("#chat").on("click", ".text .toggle-button", function() {
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const self = $(this);
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const container = self.closest(".chat");
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const content = self.closest(".content")
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.find(`.preview[data-url="${self.data("url")}"] .toggle-content`);
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const bottom = container.isScrollBottom();
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self.toggleClass("opened");
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content.toggleClass("show");
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// Tell the server we're toggling so it remembers at page reload
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// TODO Avoid sending many single events when using `/collapse` or `/expand`
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// See https://github.com/thelounge/lounge/issues/1377
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socket.emit("msg:preview:toggle", {
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target: parseInt(self.closest(".chan").data("id"), 10),
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msgId: parseInt(self.closest(".msg").prop("id").replace("msg-", ""), 10),
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link: self.data("url"),
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shown: content.hasClass("show"),
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});
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// If scrollbar was at the bottom before toggling the preview, keep it at the bottom
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if (bottom) {
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container.scrollBottom();
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}
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});
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/* Image viewer */
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const imageViewer = $("#image-viewer");
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$("#windows").on("click", ".toggle-thumbnail", function(event, data = {}) {
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const link = $(this);
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// Passing `data`, specifically `data.pushState`, to not add the action to the
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// history state if back or forward buttons were pressed.
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openImageViewer(link, data);
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// Prevent the link to open a new page since we're opening the image viewer,
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// but keep it a link to allow for Ctrl/Cmd+click.
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// By binding this event on #chat we prevent input gaining focus after clicking.
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return false;
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});
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imageViewer.on("click", function(event, data = {}) {
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// Passing `data`, specifically `data.pushState`, to not add the action to the
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// history state if back or forward buttons were pressed.
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closeImageViewer(data);
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});
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Mousetrap.bind("esc", () => closeImageViewer());
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Mousetrap.bind(["left", "right"], (e, key) => {
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if (imageViewer.hasClass("opened")) {
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const direction = key === "left" ? "previous" : "next";
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imageViewer.find(`.${direction}-image-btn`).trigger("click");
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}
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});
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function openImageViewer(link, {pushState = true} = {}) {
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$(".previous-image").removeClass("previous-image");
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$(".next-image").removeClass("next-image");
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// The next two blocks figure out what are the previous/next images. We first
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// look within the same message, as there can be multiple thumbnails per
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// message, and if not, we look at previous/next messages and take the
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// last/first thumbnail available.
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// Only expanded thumbnails are being cycled through.
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// Previous image
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let previousImage = link.closest(".preview").prev(".preview")
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.find(".toggle-content.show .toggle-thumbnail").last();
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if (!previousImage.length) {
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previousImage = link.closest(".msg").prevAll()
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.find(".toggle-content.show .toggle-thumbnail").last();
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}
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previousImage.addClass("previous-image");
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// Next image
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let nextImage = link.closest(".preview").next(".preview")
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.find(".toggle-content.show .toggle-thumbnail").first();
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if (!nextImage.length) {
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nextImage = link.closest(".msg").nextAll()
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.find(".toggle-content.show .toggle-thumbnail").first();
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}
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nextImage.addClass("next-image");
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imageViewer.html(templates.image_viewer({
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image: link.find("img").prop("src"),
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link: link.prop("href"),
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type: link.parent().hasClass("toggle-type-link") ? "link" : "image",
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hasPreviousImage: previousImage.length > 0,
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hasNextImage: nextImage.length > 0,
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}));
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// Turn off transitionend listener before opening the viewer,
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// which caused image viewer to become empty in rare cases
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imageViewer
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.off("transitionend")
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.addClass("opened");
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// History management
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if (pushState) {
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let clickTarget = "";
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// Images can be in a message (channel URL previews) or not (window URL
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// preview, e.g. changelog). This is sub-optimal and needs improvement to
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// make image preview more generic and not specific for channel previews.
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if (link.closest(".msg").length > 0) {
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clickTarget = `#${link.closest(".msg").prop("id")} `;
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}
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clickTarget += `a.toggle-thumbnail[href="${link.prop("href")}"] img`;
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history.pushState({clickTarget}, null, null);
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}
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}
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imageViewer.on("click", ".previous-image-btn", function() {
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$(".previous-image").trigger("click");
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return false;
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});
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imageViewer.on("click", ".next-image-btn", function() {
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$(".next-image").trigger("click");
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return false;
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});
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function closeImageViewer({pushState = true} = {}) {
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imageViewer
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.removeClass("opened")
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.one("transitionend", function() {
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imageViewer.empty();
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});
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input.trigger("focus");
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// History management
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if (pushState) {
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const clickTarget =
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"#sidebar " +
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`.chan[data-id="${$("#sidebar .chan.active").data("id")}"]`;
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history.pushState({clickTarget}, null, null);
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}
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}
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