mirror of https://github.com/zulip/zulip.git
1036 lines
43 KiB
JavaScript
1036 lines
43 KiB
JavaScript
function MessageListView(list, table_name, collapse_messages) {
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this.list = list;
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this.collapse_messages = collapse_messages;
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this._rows = {};
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this.message_containers = {};
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this.table_name = table_name;
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if (this.table_name) {
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this.clear_table();
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}
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this._message_groups = [];
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// Half-open interval of the indices that define the current render window
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this._render_win_start = 0;
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this._render_win_end = 0;
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}
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(function () {
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function mention_button_refers_to_me(elem) {
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var user_id = $(elem).attr('data-user-id');
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if ((user_id === '*') || people.is_my_user_id(user_id)) {
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return true;
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}
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// Handle legacy markdown that was rendered before we cut
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// over to using data-user-id.
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var email = $(elem).attr('data-user-email');
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if (email === '*' || people.is_current_user(email)) {
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return true;
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}
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return false;
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}
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function same_day(earlier_msg, later_msg) {
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if (earlier_msg === undefined || later_msg === undefined) {
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return false;
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}
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var earlier_time = new XDate(earlier_msg.msg.timestamp * 1000);
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var later_time = new XDate(later_msg.msg.timestamp * 1000);
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return earlier_time.toDateString() === later_time.toDateString();
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}
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function same_sender(a, b) {
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if (a === undefined || b === undefined) {
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return false;
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}
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return util.same_sender(a.msg, b.msg);
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}
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function same_recipient(a, b) {
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if (a === undefined || b === undefined) {
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return false;
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}
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return util.same_recipient(a.msg, b.msg);
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}
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function add_display_time(group, message_container, prev) {
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var time = new XDate(message_container.msg.timestamp * 1000);
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var today = new XDate();
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if (prev !== undefined) {
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var prev_time = new XDate(prev.msg.timestamp * 1000);
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if (time.toDateString() !== prev_time.toDateString()) {
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// NB: show_date is HTML, inserted into the document without escaping.
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group.show_date = (timerender.render_date(time, prev_time, today))[0].outerHTML;
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group.show_date_separator = true;
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}
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} else {
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// Show the date in the recipient bar, but not a date separator bar.
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group.show_date_separator = false;
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group.show_date = (timerender.render_date(time, undefined, today))[0].outerHTML;
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}
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if (message_container.timestr === undefined) {
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message_container.timestr = timerender.stringify_time(time);
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}
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}
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function set_topic_edit_properties(group, message) {
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group.realm_allow_message_editing = page_params.realm_allow_message_editing;
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group.always_visible_topic_edit = false;
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group.on_hover_topic_edit = false;
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// Messages with no topics should always have an edit icon visible
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// to encourage updating them. Admins can also edit any topic.
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if (message.subject === compose.empty_topic_placeholder()) {
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group.always_visible_topic_edit = true;
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} else if (page_params.is_admin || message_edit.is_topic_editable(message)) {
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group.on_hover_topic_edit = true;
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}
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}
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function populate_group_from_message_container(group, message_container) {
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group.is_stream = message_container.msg.is_stream;
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group.is_private = message_container.msg.is_private;
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if (group.is_stream) {
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group.background_color = stream_data.get_color(message_container.msg.stream);
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group.color_class = stream_color.get_color_class(group.background_color);
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group.invite_only = stream_data.get_invite_only(message_container.msg.stream);
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group.subject = message_container.msg.subject;
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group.match_subject = message_container.msg.match_subject;
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group.stream_url = message_container.stream_url;
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group.topic_url = message_container.topic_url;
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var sub = stream_data.get_sub(message_container.msg.stream);
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if (sub === undefined) {
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// Hack to handle unusual cases like the tutorial where
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// the streams used don't actually exist in the subs
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// module. Ideally, we'd clean this up by making the
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// tutorial populate subs.js "properly".
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group.stream_id = -1;
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} else {
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group.stream_id = sub.stream_id;
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}
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} else if (group.is_private) {
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group.pm_with_url = message_container.pm_with_url;
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group.display_reply_to = message_store.get_pm_full_names(message_container.msg);
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}
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group.display_recipient = message_container.msg.display_recipient;
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group.subject_links = message_container.msg.subject_links;
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set_topic_edit_properties(group, message_container.msg);
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var time = new XDate(message_container.msg.timestamp * 1000);
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var today = new XDate();
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var date_element = timerender.render_date(time, undefined, today)[0];
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group.date = date_element.outerHTML;
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}
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MessageListView.prototype = {
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// Number of messages to render at a time
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_RENDER_WINDOW_SIZE: 400,
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// Number of messages away from edge of render window at which we
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// trigger a re-render
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_RENDER_THRESHOLD: 50,
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_add_msg_timestring: function MessageListView___add_msg_timestring(message_container) {
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if (message_container.msg.last_edit_timestamp !== undefined) {
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// Add or update the last_edit_timestr
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var last_edit_time = new XDate(message_container.msg.last_edit_timestamp * 1000);
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var today = new XDate();
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message_container.last_edit_timestr =
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(timerender.render_date(last_edit_time, undefined, today))[0].textContent
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+ " at " + timerender.stringify_time(last_edit_time);
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}
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},
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add_subscription_marker: function MessageListView__add_subscription_marker(
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group, last_msg_container, first_msg_container) {
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if (last_msg_container === undefined) {
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return;
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}
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var last_subscribed = !last_msg_container.msg.historical;
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var first_subscribed = !first_msg_container.msg.historical;
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var stream = first_msg_container.msg.stream;
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if (!last_subscribed && first_subscribed) {
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group.bookend_top = true;
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group.subscribed = stream;
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group.bookend_content = this.list.subscribed_bookend_content(stream);
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return;
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}
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if (last_subscribed && !first_subscribed) {
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group.bookend_top = true;
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group.unsubscribed = stream;
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group.bookend_content = this.list.unsubscribed_bookend_content(stream);
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return;
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}
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},
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build_message_groups: function MessageListView__build_message_groups(message_containers) {
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function start_group() {
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return {
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message_containers: [],
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message_group_id: _.uniqueId('message_group_'),
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};
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}
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var self = this;
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var current_group = start_group();
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var new_message_groups = [];
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var prev;
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function add_message_container_to_group(message_container) {
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if (same_sender(prev, message_container)) {
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prev.next_is_same_sender = true;
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}
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current_group.message_containers.push(message_container);
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}
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function finish_group() {
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if (current_group.message_containers.length > 0) {
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populate_group_from_message_container(current_group,
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current_group.message_containers[0]);
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current_group
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.message_containers[current_group.message_containers.length - 1]
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.include_footer = true;
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new_message_groups.push(current_group);
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}
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}
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_.each(message_containers, function (message_container) {
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var message_reactions = reactions.get_message_reactions(message_container.msg);
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message_container.msg.message_reactions = message_reactions;
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message_container.include_recipient = false;
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message_container.include_footer = false;
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if (same_recipient(prev, message_container) && self.collapse_messages &&
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prev.msg.historical === message_container.msg.historical &&
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same_day(prev, message_container)) {
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add_message_container_to_group(message_container);
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} else {
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finish_group();
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current_group = start_group();
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add_message_container_to_group(message_container);
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message_container.include_recipient = true;
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message_container.subscribed = false;
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message_container.unsubscribed = false;
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// This home_msg_list condition can be removed
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// once we filter historical messages from the
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// home view on the server side (which requires
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// having an index on UserMessage.flags)
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if (self.list !== home_msg_list) {
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self.add_subscription_marker(current_group, prev, message_container);
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}
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if (message_container.msg.stream) {
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message_container.stream_url =
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narrow.by_stream_uri(message_container.msg.stream);
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message_container.topic_url =
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narrow.by_stream_subject_uri(message_container.msg.stream,
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message_container.msg.subject);
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} else {
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message_container.pm_with_url =
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message_container.msg.pm_with_url;
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}
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}
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add_display_time(current_group, message_container, prev);
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message_container.include_sender = true;
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if (!message_container.include_recipient &&
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!prev.status_message &&
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same_sender(prev, message_container)) {
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message_container.include_sender = false;
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}
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message_container.sender_is_bot = people.sender_is_bot(message_container.msg);
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self._add_msg_timestring(message_container);
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message_container.small_avatar_url = people.small_avatar_url(message_container.msg);
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if (message_container.msg.stream !== undefined) {
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message_container.background_color =
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stream_data.get_color(message_container.msg.stream);
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}
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message_container.contains_mention = message_container.msg.mentioned;
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self._maybe_format_me_message(message_container);
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prev = message_container;
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});
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finish_group();
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return new_message_groups;
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},
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join_message_groups: function MessageListView__join_message_groups(first_group, second_group) {
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// join_message_groups will combine groups if they have the
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// same_recipient on the same_day and the view supports collapsing
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// otherwise it may add a subscription_marker if required.
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// It returns true if the two groups were joined in to one and
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// the second_group should be ignored.
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if (first_group === undefined || second_group === undefined) {
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return false;
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}
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var last_msg_container = _.last(first_group.message_containers);
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var first_msg_container = _.first(second_group.message_containers);
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// Join two groups into one.
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if (this.collapse_messages && same_recipient(last_msg_container, first_msg_container) &&
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same_day(last_msg_container, first_msg_container) &&
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last_msg_container.msg.historical === first_msg_container.msg.historical) {
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if (!last_msg_container.status_message && !first_msg_container.msg.is_me_message
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&& same_sender(last_msg_container, first_msg_container)) {
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first_msg_container.include_sender = false;
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}
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if (same_sender(last_msg_container, first_msg_container)) {
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last_msg_container.next_is_same_sender = true;
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}
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first_group.message_containers =
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first_group.message_containers.concat(second_group.message_containers);
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return true;
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// Add a subscription marker
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} else if (this.list !== home_msg_list &&
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last_msg_container.msg.historical !== first_msg_container.msg.historical) {
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second_group.bookend_top = true;
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this.add_subscription_marker(second_group, last_msg_container, first_msg_container);
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}
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return false;
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},
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merge_message_groups: function MessageListView__merge_message_groups(new_message_groups,
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where) {
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// merge_message_groups takes a list of new messages groups to add to
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// this._message_groups and a location where to merge them currently
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// top or bottom. It returns an object of changes which needed to be
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// rendered in to the page. The types of actions are append_group,
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// prepend_group, rerender_group, append_message.
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//
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// append_groups are groups to add to the top of the rendered DOM
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// prepend_groups are group to add to the bottom of the rendered DOM
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// rerender_groups are group that should be updated in place in the DOM
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// append_messages are messages which should be added to the last group in the DOM
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// rerender_messages are messages which should be updated in place in the DOM
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var message_actions = {
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append_groups: [],
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prepend_groups: [],
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rerender_groups: [],
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append_messages: [],
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rerender_messages: [],
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};
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var first_group;
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var second_group;
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if (where === 'top') {
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first_group = _.last(new_message_groups);
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second_group = _.first(this._message_groups);
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if (this.join_message_groups(first_group, second_group)) {
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// join_message_groups moved the old message to the end of the
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// new group. We need to replace the old rendered message
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// group. So we will reuse its ID.
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first_group.message_group_id = second_group.message_group_id;
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message_actions.rerender_groups.push(first_group);
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// Swap the new group in
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this._message_groups.shift();
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this._message_groups.unshift(first_group);
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new_message_groups = _.initial(new_message_groups);
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} else if (!same_day(second_group.message_containers[0],
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first_group.message_containers[0])) {
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// The groups did not merge, so we need up update the date row for the old group
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add_display_time(
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second_group,
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_.first(second_group.message_containers),
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_.last(first_group.message_containers)
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);
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// We could add an action to update the date row, but for now rerender the group.
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message_actions.rerender_groups.push(second_group);
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}
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message_actions.prepend_groups = new_message_groups;
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this._message_groups = new_message_groups.concat(this._message_groups);
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} else {
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first_group = _.last(this._message_groups);
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second_group = _.first(new_message_groups);
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if (this.join_message_groups(first_group, second_group)) {
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// rerender the last message
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message_actions.rerender_messages.push(
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first_group.message_containers[
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first_group.message_containers.length
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- second_group.message_containers.length - 1]
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);
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message_actions.append_messages = _.first(new_message_groups).message_containers;
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new_message_groups = _.rest(new_message_groups);
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} else if (first_group !== undefined && second_group !== undefined) {
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var last_msg_container = _.last(first_group.message_containers);
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var first_msg_container = _.first(second_group.message_containers);
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if (same_day(last_msg_container, first_msg_container)) {
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// Clear the date if it is the same as the last group
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delete second_group.show_date;
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delete second_group.show_date_separator;
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} else {
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// If we just sent the first message on a new day
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// in a narrow, make sure we render a date separator.
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add_display_time(second_group, first_msg_container,
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last_msg_container);
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}
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}
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message_actions.append_groups = new_message_groups;
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this._message_groups = this._message_groups.concat(new_message_groups);
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}
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return message_actions;
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},
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_post_process_dom_messages: function MessageListView___post_process_dom_messages(dom_messages) {
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// _post_process_dom_messages adds applies some extra formating to messages
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// and stores them in self._rows and sends an event that the message is
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// complete. _post_process_dom_messages should be a list of DOM nodes not
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// jQuery objects.
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var self = this;
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_.each(dom_messages, function (dom_message) {
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if (!_.isElement(dom_message)) {
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blueslip.warn('Only DOM nodes can be passed to _post_process_messages');
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}
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var row = $(dom_message);
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// Save DOM elements by id into self._rows for O(1) lookup
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if (row.hasClass('message_row')) {
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self._rows[row.attr('zid')] = dom_message;
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}
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if (row.hasClass('mention')) {
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row.find('.user-mention').each(function () {
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// We give special highlights to the mention buttons
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// that refer to the current user.
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if (mention_button_refers_to_me(this)) {
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$(this).addClass('user-mention-me');
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}
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});
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}
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// Display emoji (including realm emoji) as text if
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// page_params.emojiset is 'text'.
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if (page_params.emojiset === 'text') {
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row.find(".emoji").replaceWith(function () {
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var text = $(this).attr("title");
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return ":" + text + ":";
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});
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}
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var id = rows.id(row);
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message_edit.maybe_show_edit(row, id);
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});
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},
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_get_message_template: function MessageListView___get_message_template(message_container) {
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var msg_reactions = reactions.get_message_reactions(message_container.msg);
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message_container.msg.message_reactions = msg_reactions;
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var msg_to_render = _.extend(message_container, {
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table_name: this.table_name,
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});
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return templates.render('single_message', msg_to_render);
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},
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render: function MessageListView__render(messages, where, messages_are_new) {
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// This function processes messages into chunks with separators between them,
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// and templates them to be inserted as table rows into the DOM.
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if (messages.length === 0 || this.table_name === undefined) {
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return;
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}
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var list = this.list; // for convenience
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var table_name = this.table_name;
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var table = rows.get_table(table_name);
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var orig_scrolltop_offset;
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var message_containers;
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var self = this;
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// The messages we are being asked to render are shared with between
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// all messages lists. To prevent having both list views overwriting
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// each others data we will make a new message object to add data to
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// for rendering.
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message_containers = _.map(messages, function (message) {
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if (message.starred) {
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message.starred_status = i18n.t("Unstar");
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} else {
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message.starred_status = i18n.t("Star");
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}
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return {msg: message};
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});
|
|
|
|
function save_scroll_position() {
|
|
if (orig_scrolltop_offset === undefined && self.selected_row().length > 0) {
|
|
orig_scrolltop_offset = self.selected_row().offset().top;
|
|
}
|
|
}
|
|
|
|
function restore_scroll_position() {
|
|
if (list === current_msg_list && orig_scrolltop_offset !== undefined) {
|
|
list.view.set_message_offset(orig_scrolltop_offset);
|
|
list.reselect_selected_id();
|
|
}
|
|
}
|
|
|
|
// This function processes messages into chunks with separators between them,
|
|
// and templates them to be inserted as table rows into the DOM.
|
|
|
|
if (message_containers.length === 0 || this.table_name === undefined) {
|
|
return;
|
|
}
|
|
|
|
var new_message_groups = this.build_message_groups(message_containers, this.table_name);
|
|
var message_actions = this.merge_message_groups(new_message_groups, where);
|
|
var new_dom_elements = [];
|
|
var rendered_groups;
|
|
var dom_messages;
|
|
var last_message_row;
|
|
var last_group_row;
|
|
|
|
_.each(message_containers, function (message_container) {
|
|
self.message_containers[message_container.msg.id] = message_container;
|
|
});
|
|
|
|
// Render new message groups on the top
|
|
if (message_actions.prepend_groups.length > 0) {
|
|
save_scroll_position();
|
|
|
|
rendered_groups = $(templates.render('message_group', {
|
|
message_groups: message_actions.prepend_groups,
|
|
use_match_properties: self.list.is_search(),
|
|
table_name: self.table_name,
|
|
}));
|
|
|
|
dom_messages = rendered_groups.find('.message_row');
|
|
new_dom_elements = new_dom_elements.concat(rendered_groups);
|
|
|
|
self._post_process_dom_messages(dom_messages.get());
|
|
|
|
// The date row will be included in the message groups or will be
|
|
// added in a rerenderd in the group below
|
|
table.find('.recipient_row').first().prev('.date_row').remove();
|
|
table.prepend(rendered_groups);
|
|
condense.condense_and_collapse(dom_messages);
|
|
}
|
|
|
|
// Rerender message groups
|
|
if (message_actions.rerender_groups.length > 0) {
|
|
save_scroll_position();
|
|
|
|
_.each(message_actions.rerender_groups, function (message_group) {
|
|
var old_message_group = $('#' + message_group.message_group_id);
|
|
// Remove the top date_row, we'll re-add it after rendering
|
|
old_message_group.prev('.date_row').remove();
|
|
|
|
rendered_groups = $(templates.render('message_group', {
|
|
message_groups: [message_group],
|
|
use_match_properties: self.list.is_search(),
|
|
table_name: self.table_name,
|
|
}));
|
|
|
|
dom_messages = rendered_groups.find('.message_row');
|
|
// Not adding to new_dom_elements it is only used for autoscroll
|
|
|
|
self._post_process_dom_messages(dom_messages.get());
|
|
old_message_group.replaceWith(rendered_groups);
|
|
condense.condense_and_collapse(dom_messages);
|
|
});
|
|
}
|
|
|
|
// Rerender message rows
|
|
if (message_actions.rerender_messages.length > 0) {
|
|
_.each(message_actions.rerender_messages, function (message_container) {
|
|
var old_row = self.get_row(message_container.msg.id);
|
|
var row = $(self._get_message_template(message_container));
|
|
self._post_process_dom_messages(row.get());
|
|
old_row.replaceWith(row);
|
|
condense.condense_and_collapse(row);
|
|
list.reselect_selected_id();
|
|
});
|
|
}
|
|
|
|
// Insert new messages in to the last message group
|
|
if (message_actions.append_messages.length > 0) {
|
|
last_message_row = table.find('.message_row:last').expectOne();
|
|
last_group_row = rows.get_message_recipient_row(last_message_row);
|
|
dom_messages = $(_.map(message_actions.append_messages, function (message_container) {
|
|
return self._get_message_template(message_container);
|
|
}).join('')).filter('.message_row');
|
|
|
|
self._post_process_dom_messages(dom_messages.get());
|
|
last_group_row.append(dom_messages);
|
|
|
|
condense.condense_and_collapse(dom_messages);
|
|
new_dom_elements = new_dom_elements.concat(dom_messages);
|
|
}
|
|
|
|
// Add new message groups to the end
|
|
if (message_actions.append_groups.length > 0) {
|
|
// Remove the trailing bookend; it'll be re-added after we do our rendering
|
|
self.clear_trailing_bookend();
|
|
|
|
rendered_groups = $(templates.render('message_group', {
|
|
message_groups: message_actions.append_groups,
|
|
use_match_properties: self.list.is_search(),
|
|
table_name: self.table_name,
|
|
}));
|
|
|
|
dom_messages = rendered_groups.find('.message_row');
|
|
new_dom_elements = new_dom_elements.concat(rendered_groups);
|
|
|
|
self._post_process_dom_messages(dom_messages.get());
|
|
|
|
// This next line is a workaround for a weird scrolling
|
|
// bug on Chrome. Basically, in Chrome 64, we had a
|
|
// highly reproducible bug where if you hit the "End" key
|
|
// 5 times in a row in a `near:1` narrow (or any other
|
|
// narrow with enough content below to try this), the 5th
|
|
// time (because RENDER_WINDOW_SIZE / batch_size = 4,
|
|
// i.e. the first time we need to rerender to show the
|
|
// message "End" jumps to) would trigger an unexpected
|
|
// scroll, resulting in some chaotic scrolling and
|
|
// additional fetches (from bottom_whitespace ending up in
|
|
// the view). During debugging, we found that this adding
|
|
// this next line seems to prevent the Chrome bug from firing.
|
|
message_viewport.scrollTop();
|
|
|
|
table.append(rendered_groups);
|
|
condense.condense_and_collapse(dom_messages);
|
|
}
|
|
|
|
restore_scroll_position();
|
|
|
|
var last_message_group = _.last(self._message_groups);
|
|
if (last_message_group !== undefined) {
|
|
list.last_message_historical =
|
|
_.last(last_message_group.message_containers).msg.historical;
|
|
}
|
|
|
|
var stream_name = narrow_state.stream();
|
|
if (stream_name !== undefined) {
|
|
// If user narrows to a stream, doesn't update
|
|
// trailing bookend if user is subscribed.
|
|
var sub = stream_data.get_sub(stream_name);
|
|
if (sub === undefined || !sub.subscribed) {
|
|
list.update_trailing_bookend();
|
|
}
|
|
}
|
|
|
|
if (list === current_msg_list) {
|
|
// Update the fade.
|
|
|
|
var get_element = function (message_group) {
|
|
// We don't have a MessageGroup class, but we can at least hide the messy details
|
|
// of rows.js from compose_fade. We provide a callback function to be lazy--
|
|
// compose_fade may not actually need the elements depending on its internal
|
|
// state.
|
|
var message_row = self.get_row(message_group.message_containers[0].msg.id);
|
|
return rows.get_message_recipient_row(message_row);
|
|
};
|
|
|
|
compose_fade.update_rendered_message_groups(new_message_groups, get_element);
|
|
}
|
|
|
|
if (list === current_msg_list && messages_are_new) {
|
|
self._maybe_autoscroll(new_dom_elements);
|
|
}
|
|
},
|
|
|
|
|
|
_maybe_autoscroll: function MessageListView__maybe_autoscroll(rendered_elems) {
|
|
// If we are near the bottom of our feed (the bottom is visible) and can
|
|
// scroll up without moving the pointer out of the viewport, do so, by
|
|
// up to the amount taken up by the new message.
|
|
var new_messages_height = 0;
|
|
var id_of_last_message_sent_by_us = -1;
|
|
|
|
// C++ iterators would have made this less painful
|
|
_.each(rendered_elems.reverse(), function (elem) {
|
|
// Sometimes there are non-DOM elements in rendered_elems; only
|
|
// try to get the heights of actual trs.
|
|
if (elem.is("div")) {
|
|
new_messages_height += elem.height();
|
|
// starting from the last message, ignore message heights that weren't sent by me.
|
|
if (id_of_last_message_sent_by_us > -1) {
|
|
return;
|
|
}
|
|
var row_id = rows.id(elem);
|
|
// check for `row_id` NaN in case we're looking at a date row or bookend row
|
|
if (row_id > -1 &&
|
|
people.is_current_user(this.get_message(row_id).sender_email)) {
|
|
id_of_last_message_sent_by_us = rows.id(elem);
|
|
}
|
|
}
|
|
}, this);
|
|
|
|
var selected_row = this.selected_row();
|
|
var last_visible = rows.last_visible();
|
|
|
|
// Make sure we have a selected row and last visible row. (defensive)
|
|
if (!(selected_row && (selected_row.length > 0) && last_visible)) {
|
|
return;
|
|
}
|
|
|
|
var selected_row_offset = selected_row.offset().top;
|
|
var info = message_viewport.message_viewport_info();
|
|
var available_space_for_scroll = selected_row_offset - info.visible_top;
|
|
|
|
// Don't scroll if we can't move the pointer up.
|
|
if (available_space_for_scroll <= 0) {
|
|
return;
|
|
}
|
|
|
|
if (new_messages_height <= 0) {
|
|
return;
|
|
}
|
|
|
|
if (!activity.has_focus) {
|
|
// Don't autoscroll if the window hasn't had focus
|
|
// recently. This in intended to help protect us from
|
|
// auto-scrolling downwards when the window is in the
|
|
// background and might be having some functionality
|
|
// throttled by modern Chrome's aggressive power-saving
|
|
// features.
|
|
blueslip.log("Suppressing scrolldown due to inactivity");
|
|
return;
|
|
}
|
|
|
|
// do not scroll if there are any active popovers.
|
|
if (popovers.any_active()) {
|
|
return;
|
|
}
|
|
|
|
// This next decision is fairly debatable. For a big message that
|
|
// would push the pointer off the screen, we do a partial autoscroll,
|
|
// which has the following implications:
|
|
// a) user sees scrolling (good)
|
|
// b) user's pointer stays on screen (good)
|
|
// c) scroll amount isn't really tied to size of new messages (bad)
|
|
// d) all the bad things about scrolling for users who want messages
|
|
// to stay on the screen
|
|
var scroll_amount = new_messages_height;
|
|
|
|
if (scroll_amount > available_space_for_scroll) {
|
|
scroll_amount = available_space_for_scroll;
|
|
}
|
|
|
|
// Let's work our way back to whether the user was already dealing
|
|
// with messages off the screen, in which case we shouldn't autoscroll.
|
|
var bottom_last_visible = last_visible.offset().top + last_visible.height();
|
|
var bottom_old_last_visible = bottom_last_visible - new_messages_height;
|
|
var bottom_viewport = info.visible_top + info.visible_height;
|
|
|
|
// Exit if the user was already past the bottom.
|
|
if (bottom_old_last_visible > bottom_viewport) {
|
|
return;
|
|
}
|
|
|
|
// Ok, we are finally ready to actually scroll.
|
|
message_viewport.system_initiated_animate_scroll(scroll_amount);
|
|
},
|
|
|
|
|
|
clear_rendering_state: function MessageListView__clear_rendering_state(clear_table) {
|
|
if (clear_table) {
|
|
this.clear_table();
|
|
}
|
|
this.list.last_message_historical = false;
|
|
|
|
this._render_win_start = 0;
|
|
this._render_win_end = 0;
|
|
},
|
|
|
|
update_render_window: function MessageListView__update_render_window(selected_idx,
|
|
check_for_changed) {
|
|
var new_start = Math.max(selected_idx - this._RENDER_WINDOW_SIZE / 2, 0);
|
|
if (check_for_changed && new_start === this._render_win_start) {
|
|
return false;
|
|
}
|
|
|
|
this._render_win_start = new_start;
|
|
this._render_win_end = Math.min(this._render_win_start + this._RENDER_WINDOW_SIZE,
|
|
this.list.num_items());
|
|
return true;
|
|
},
|
|
|
|
|
|
maybe_rerender: function MessageListView__maybe_rerender() {
|
|
if (this.table_name === undefined) {
|
|
return false;
|
|
}
|
|
|
|
var selected_idx = this.list.selected_idx();
|
|
|
|
// We rerender under the following conditions:
|
|
// * The selected message is within this._RENDER_THRESHOLD messages
|
|
// of the top of the currently rendered window and the top
|
|
// of the window does not abut the beginning of the message
|
|
// list
|
|
// * The selected message is within this._RENDER_THRESHOLD messages
|
|
// of the bottom of the currently rendered window and the
|
|
// bottom of the window does not abut the end of the
|
|
// message list
|
|
if (! (((selected_idx - this._render_win_start < this._RENDER_THRESHOLD)
|
|
&& (this._render_win_start !== 0)) ||
|
|
((this._render_win_end - selected_idx <= this._RENDER_THRESHOLD)
|
|
&& (this._render_win_end !== this.list.num_items())))) {
|
|
return false;
|
|
}
|
|
|
|
if (!this.update_render_window(selected_idx, true)) {
|
|
return false;
|
|
}
|
|
|
|
this.rerender_preserving_scrolltop();
|
|
return true;
|
|
},
|
|
|
|
rerender_preserving_scrolltop: function MessageListView__rerender_preserving_scrolltop() {
|
|
// old_offset is the number of pixels between the top of the
|
|
// viewable window and the selected message
|
|
var old_offset;
|
|
var selected_row = this.selected_row();
|
|
var selected_in_view = (selected_row.length > 0);
|
|
if (selected_in_view) {
|
|
old_offset = selected_row.offset().top;
|
|
}
|
|
return this.rerender_with_target_scrolltop(selected_row, old_offset);
|
|
},
|
|
|
|
set_message_offset: function (offset) {
|
|
var msg = this.selected_row();
|
|
message_viewport.scrollTop(message_viewport.scrollTop() + msg.offset().top - offset);
|
|
},
|
|
|
|
rerender_with_target_scrolltop: function (selected_row, target_offset) {
|
|
// target_offset is the target number of pixels between the top of the
|
|
// viewable window and the selected message
|
|
this.clear_table();
|
|
this.render(this.list.all_messages().slice(this._render_win_start,
|
|
this._render_win_end), 'bottom');
|
|
|
|
// If we could see the newly selected message, scroll the
|
|
// window such that the newly selected message is at the
|
|
// same location as it would have been before we
|
|
// re-rendered.
|
|
if (target_offset !== undefined) {
|
|
if (this.selected_row().length === 0 && this.list.selected_id() > -1) {
|
|
this.list.select_id(this.list.selected_id(), {use_closest: true});
|
|
}
|
|
|
|
this.set_message_offset(target_offset);
|
|
}
|
|
},
|
|
|
|
_rerender_header: function MessageListView__maybe_rerender_header(message_containers) {
|
|
// Given a list of messages that are in the **same** message group,
|
|
// rerender the header / recipient bar of the messages
|
|
if (message_containers.length === 0) {
|
|
return;
|
|
}
|
|
|
|
var first_row = this.get_row(message_containers[0].msg.id);
|
|
|
|
// We may not have the row if the stream or topic was muted
|
|
if (first_row.length === 0) {
|
|
return;
|
|
}
|
|
|
|
var recipient_row = rows.get_message_recipient_row(first_row);
|
|
var header = recipient_row.find('.message_header');
|
|
|
|
var group = {message_containers: message_containers};
|
|
populate_group_from_message_container(group, message_containers[0]);
|
|
|
|
var rendered_recipient_row = $(templates.render('recipient_row', group));
|
|
|
|
header.replaceWith(rendered_recipient_row);
|
|
},
|
|
|
|
_rerender_message: function MessageListView___rerender_message(message_container,
|
|
message_content_edited) {
|
|
var row = this.get_row(message_container.msg.id);
|
|
var was_selected = this.list.selected_message() === message_container.msg;
|
|
|
|
// Re-render just this one message
|
|
this._add_msg_timestring(message_container);
|
|
this._maybe_format_me_message(message_container);
|
|
|
|
// Make sure the right thing happens if the message was edited to mention us.
|
|
message_container.contains_mention = message_container.msg.mentioned;
|
|
|
|
var rendered_msg = $(this._get_message_template(message_container));
|
|
if (message_content_edited) {
|
|
rendered_msg.addClass("fade-in-message");
|
|
}
|
|
this._post_process_dom_messages(rendered_msg.get());
|
|
row.replaceWith(rendered_msg);
|
|
|
|
if (was_selected) {
|
|
this.list.select_id(message_container.msg.id);
|
|
}
|
|
},
|
|
|
|
rerender_messages: function MessageListView__rerender_messages(messages,
|
|
message_content_edited) {
|
|
var self = this;
|
|
|
|
// Convert messages to list messages
|
|
var message_containers = _.map(messages, function (message) {
|
|
return self.message_containers[message.id];
|
|
});
|
|
// We may not have the message_container if the stream or topic was muted
|
|
message_containers = _.reject(message_containers, function (message_container) {
|
|
return message_container === undefined;
|
|
});
|
|
|
|
var message_groups = [];
|
|
var current_group = [];
|
|
_.each(message_containers, function (message_container) {
|
|
if (current_group.length === 0 ||
|
|
same_recipient(current_group[current_group.length - 1], message_container)) {
|
|
current_group.push(message_container);
|
|
} else {
|
|
message_groups.push(current_group);
|
|
current_group = [];
|
|
}
|
|
self._rerender_message(message_container, message_content_edited);
|
|
});
|
|
if (current_group.length !== 0) {
|
|
message_groups.push(current_group);
|
|
}
|
|
_.each(message_groups, function (messages_in_group) {
|
|
self._rerender_header(messages_in_group, message_content_edited);
|
|
});
|
|
},
|
|
|
|
append: function MessageListView__append(messages, messages_are_new) {
|
|
var cur_window_size = this._render_win_end - this._render_win_start;
|
|
if (cur_window_size < this._RENDER_WINDOW_SIZE) {
|
|
var slice_to_render = messages.slice(0, this._RENDER_WINDOW_SIZE - cur_window_size);
|
|
this.render(slice_to_render, 'bottom', messages_are_new);
|
|
this._render_win_end += slice_to_render.length;
|
|
}
|
|
|
|
// If the pointer is high on the page such that there is a
|
|
// lot of empty space below and the render window is full, a
|
|
// newly received message should trigger a rerender so that
|
|
// the new message, which will appear in the viewable area,
|
|
// is rendered.
|
|
this.maybe_rerender();
|
|
},
|
|
|
|
prepend: function MessageListView__prepend(messages) {
|
|
this._render_win_start += messages.length;
|
|
this._render_win_end += messages.length;
|
|
|
|
var cur_window_size = this._render_win_end - this._render_win_start;
|
|
if (cur_window_size < this._RENDER_WINDOW_SIZE) {
|
|
var msgs_to_render_count = this._RENDER_WINDOW_SIZE - cur_window_size;
|
|
var slice_to_render = messages.slice(messages.length - msgs_to_render_count);
|
|
this.render(slice_to_render, 'top', false);
|
|
this._render_win_start -= slice_to_render.length;
|
|
}
|
|
|
|
// See comment for maybe_rerender call in the append code path
|
|
this.maybe_rerender();
|
|
},
|
|
|
|
rerender_the_whole_thing: function MessageListView__rerender_the_whole_thing() {
|
|
// TODO: Figure out if we can unify this with this.list.rerender().
|
|
this.clear_rendering_state(true);
|
|
this.update_render_window(this.list.selected_idx(), false);
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this.render(this.list.all_messages().slice(this._render_win_start, this._render_win_end), 'bottom');
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},
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|
|
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clear_table: function MessageListView_clear_table() {
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// We do not want to call .empty() because that also clears
|
|
// jQuery data. This does mean, however, that we need to be
|
|
// mindful of memory leaks.
|
|
rows.get_table(this.table_name).children().detach();
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|
this._rows = {};
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|
this._message_groups = [];
|
|
this.message_containers = {};
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|
},
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|
|
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get_row: function MessageListView_get_row(id) {
|
|
return $(this._rows[id]);
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|
},
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|
|
|
clear_trailing_bookend: function MessageListView_clear_trailing_bookend() {
|
|
var trailing_bookend = rows.get_table(this.table_name).find('.trailing_bookend');
|
|
trailing_bookend.remove();
|
|
},
|
|
|
|
render_trailing_bookend: function MessageListView_render_trailing_bookend(
|
|
trailing_bookend_content, subscribed, show_button) {
|
|
var rendered_trailing_bookend = $(templates.render('bookend', {
|
|
bookend_content: trailing_bookend_content,
|
|
trailing: show_button,
|
|
subscribed: subscribed,
|
|
}));
|
|
rows.get_table(this.table_name).append(rendered_trailing_bookend);
|
|
},
|
|
|
|
selected_row: function MessageListView_selected_row() {
|
|
return this.get_row(this.list.selected_id());
|
|
},
|
|
|
|
get_message: function MessageListView_get_message(id) {
|
|
return this.list.get(id);
|
|
},
|
|
|
|
change_message_id: function MessageListView_change_message_id(old_id, new_id) {
|
|
if (this._rows[old_id] !== undefined) {
|
|
var row = this._rows[old_id];
|
|
delete this._rows[old_id];
|
|
|
|
row.setAttribute('zid', new_id);
|
|
row.setAttribute('id', this.table_name + new_id);
|
|
$(row).removeClass('local');
|
|
this._rows[new_id] = row;
|
|
}
|
|
|
|
if (this.message_containers[old_id] !== undefined) {
|
|
var message_container = this.message_containers[old_id];
|
|
delete this.message_containers[old_id];
|
|
this.message_containers[new_id] = message_container;
|
|
}
|
|
|
|
},
|
|
|
|
_maybe_format_me_message: function MessageListView__maybe_format_me_message(message_container) {
|
|
if (message_container.msg.is_me_message) {
|
|
// Slice the '<p>/me ' off the front, and '</p>' off the end
|
|
message_container.status_message = message_container.msg.content.slice(4 + 3, -4);
|
|
message_container.include_sender = true;
|
|
} else {
|
|
message_container.status_message = false;
|
|
}
|
|
},
|
|
};
|
|
|
|
}());
|
|
|
|
if (typeof module !== 'undefined') {
|
|
module.exports = MessageListView;
|
|
}
|