mirror of https://github.com/zulip/zulip.git
714 lines
26 KiB
JavaScript
714 lines
26 KiB
JavaScript
/*jslint nomen: true */
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function MessageList(table_name, filter, opts) {
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$.extend(this, {collapse_messages: true}, opts);
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this._items = [];
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this._hash = {};
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this.table_name = table_name;
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this.filter = filter;
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this._selected_id = -1;
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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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if (this.table_name) {
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this._clear_table();
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}
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if (this.filter === undefined) {
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this.filter = new narrow.Filter();
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}
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this.narrowed = false;
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if (this.table_name === "zfilt") {
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this.narrowed = true;
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}
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return this;
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}
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(function () {
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function add_display_time(message, prev) {
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var time = new XDate(message.timestamp * 1000);
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var include_date = false;
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if (prev !== undefined) {
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var prev_time = new XDate(prev.timestamp * 1000);
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if (time.toDateString() !== prev_time.toDateString()) {
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include_date = true;
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}
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} else {
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include_date = true;
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}
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if (include_date) {
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// NB: show_date is HTML, inserted into the document without escaping.
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message.show_date = (timerender.render_date(time))[0].outerHTML;
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} else {
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// This is run on re-render, and must remove the date if a message
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// from the same day is added above this one when scrolling up.
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message.show_date = undefined;
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}
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if (message.timestr === undefined){
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message.timestr = time.toString("HH:mm");
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}
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}
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MessageList.prototype = {
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get: function MessageList_get(id) {
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id = parseInt(id, 10);
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if (isNaN(id)) {
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return undefined;
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}
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return this._hash[id];
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},
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empty: function MessageList_empty() {
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return this._items.length === 0;
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},
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first: function MessageList_first() {
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return this._items[0];
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},
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last: function MessageList_last() {
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return this._items[this._items.length - 1];
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},
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_clear_table: function MessageList__clear_table() {
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// We do not want to call .empty() because that also clears
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// jQuery data. This does mean, however, that we need to be
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// mindful of memory leaks.
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rows.get_table(this.table_name).children().detach();
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},
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_clear_rendering_state: function MessageList__clear_rendering_state(clear_table) {
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this._message_groups = [];
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if (clear_table) {
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this._clear_table();
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}
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this.last_message_historical = false;
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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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clear: function MessageList_clear(opts) {
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opts = $.extend({}, {clear_selected_id: true}, opts);
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this._items = [];
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this._hash = {};
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this._clear_rendering_state(true);
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if (opts.clear_selected_id) {
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this._selected_id = -1;
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}
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},
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selected_id: function MessageList_selected_id() {
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return this._selected_id;
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},
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select_id: function MessageList_select_id(id, opts) {
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opts = $.extend({
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then_scroll: false,
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use_closest: false,
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mark_read: true
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}, opts, {
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id: id,
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msg_list: this,
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previously_selected: this._selected_id
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});
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id = parseInt(id, 10);
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if (isNaN(id)) {
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blueslip.fatal("Bad message id");
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}
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if (this.get(id) === undefined) {
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if (!opts.use_closest) {
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blueslip.error("Selected message id not in MessageList",
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{table_name: this.table_name, id: id});
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}
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id = this.closest_id(id);
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opts.id = id;
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}
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this._selected_id = id;
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if (!opts.from_rendering) {
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this._maybe_rerender();
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}
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$(document).trigger($.Event('message_selected.zephyr', opts));
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},
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selected_message: function MessageList_selected_message() {
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return this.get(this._selected_id);
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},
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selected_row: function MessageList_selected_row() {
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return rows.get(this._selected_id, this.table_name);
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},
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closest_id: function MessageList_closest_id(id) {
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if (this._items.length === 0) {
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return -1;
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}
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var closest = util.lower_bound(this._items, id,
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function (a, b) {
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return a.id < b;
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});
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if (closest === this._items.length
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|| (closest !== 0
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&& (id - this._items[closest - 1].id <
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this._items[closest].id - id)))
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{
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closest = closest - 1;
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}
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return this._items[closest].id;
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},
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advance_past_messages: function MessageList_advance_past_messages(msg_ids) {
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// Start with the current pointer, but then keep advancing the
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// pointer while the next message's id is in msg_ids. See trac #1555
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// for more context, but basically we are skipping over contiguous
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// messages that we have recently visited.
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var next_msg_id = 0;
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var id_set = {};
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$.each(msg_ids, function (idx, msg_id) {
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id_set[msg_id] = true;
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});
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var idx = this._selected_idx() + 1;
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while (idx < this._items.length) {
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var msg_id = this._items[idx].id;
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if (!id_set[msg_id]) {
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break;
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}
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next_msg_id = msg_id;
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++idx;
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}
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if (next_msg_id > 0) {
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this._selected_id = next_msg_id;
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}
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},
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_add_to_hash: function MessageList__add_to_hash(messages) {
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var self = this;
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messages.forEach(function (elem) {
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var id = parseInt(elem.id, 10);
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if (isNaN(id)) {
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blueslip.fatal("Bad message id");
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}
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if (self._hash[id] !== undefined) {
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blueslip.error("Duplicate message added to MessageList");
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return;
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}
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self._hash[id] = elem;
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});
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},
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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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_update_render_window: function MessageList__update_render_window(selected_idx, check_for_changed) {
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var new_start = Math.max(selected_idx - this._RENDER_WINDOW_SIZE / 2, 0);
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if (check_for_changed && new_start === this._render_win_start) {
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return false;
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}
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this._render_win_start = new_start;
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this._render_win_end = Math.min(this._render_win_start + this._RENDER_WINDOW_SIZE,
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this._items.length);
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return true;
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},
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_selected_idx: function MessageList__selected_idx() {
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return util.lower_bound(this._items, this._selected_id,
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function (a, b) { return a.id < b; });
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},
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_maybe_rerender: function MessageList__maybe_rerender() {
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if (this.table_name === undefined) {
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return false;
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}
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var selected_idx = this._selected_idx();
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// We rerender under the following conditions:
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// * The selected message is within this._RENDER_THRESHOLD messages
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// of the top of the currently rendered window and the top
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// of the window does not abut the beginning of the message
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// list
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// * The selected message is within this._RENDER_THRESHOLD messages
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// of the bottom of the currently rendered window and the
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// bottom of the window does not abut the end of the
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// message list
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if (! (((selected_idx - this._render_win_start < this._RENDER_THRESHOLD)
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&& (this._render_win_start !== 0)) ||
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((this._render_win_end - selected_idx <= this._RENDER_THRESHOLD)
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&& (this._render_win_end !== this._items.length))))
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{
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return false;
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}
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if (!this._update_render_window(selected_idx, true)) {
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return false;
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}
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this._rerender_preserving_scrolltop();
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return true;
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},
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_rerender_preserving_scrolltop: function MessageList__rerender_preserving_scrolltop() {
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// scrolltop_offset is the number of pixels between the top of the
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// viewable window and the newly selected message
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var scrolltop_offset;
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var selected_row = rows.get(this._selected_id, this.table_name);
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var selected_in_view = (selected_row.length > 0);
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if (selected_in_view) {
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scrolltop_offset = viewport.scrollTop() - selected_row.offset().top;
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}
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this._clear_table();
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this._render(this._items.slice(this._render_win_start,
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this._render_win_end), 'bottom');
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// If we could see the newly selected message, scroll the
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// window such that the newly selected message is at the
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// same location as it would have been before we
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// re-rendered.
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if (selected_in_view) {
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viewport.scrollTop(rows.get(this._selected_id, this.table_name).offset().top + scrolltop_offset);
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}
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},
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_render: function MessageList__render(messages, where, messages_are_new) {
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if (messages.length === 0 || this.table_name === undefined)
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return;
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var self = this;
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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 messages_to_render = [];
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var ids_where_next_is_same_sender = {};
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var prev;
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var orig_scrolltop_offset, last_message_id;
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var current_group = [];
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var new_message_groups = [];
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if (where === "bottom") {
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// Remove the trailing bookend; it'll be re-added after we do our rendering
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this.clear_trailing_bookend();
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} else if (this.selected_row().length > 0) {
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orig_scrolltop_offset = this.selected_row().offset().top - viewport.scrollTop();
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}
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if (where === 'top' && this.collapse_messages && this._message_groups.length > 0) {
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// Delete the current top message group, and add it back in with these
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// messages, in order to collapse properly.
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//
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// This means we redraw the entire view on each update when narrowed by
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// subject, which could be a problem down the line. For now we hope
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// that subject views will not be very big.
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var top_group = this._message_groups[0];
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var top_messages = [];
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$.each(top_group, function (index, id) {
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rows.get(id, table_name).remove();
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// Remove any date row headers for these messages
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$('.date_row[data-zid=' + id + ']').remove();
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top_messages.push(self.get(id));
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});
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messages = messages.concat(top_messages);
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// Delete the leftover recipient label.
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table.find('.recipient_row:first').remove();
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} else {
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last_message_id = rows.id(table.find('tr[zid]:last'));
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prev = this.get(last_message_id);
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}
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$.each(messages, function (index, message) {
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message.include_recipient = false;
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message.include_bookend = false;
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message.include_footer = false;
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add_display_time(message, prev);
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if (util.same_recipient(prev, message) && self.collapse_messages &&
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prev.historical === message.historical && !message.show_date) {
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current_group.push(message.id);
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// prev is no longer the last element in this block
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prev.include_footer = false;
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} else {
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if (current_group.length > 0)
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new_message_groups.push(current_group);
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current_group = [message.id];
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// Add a space to the table, but not for the first element.
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message.include_recipient = true;
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message.include_bookend = (prev !== undefined);
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if (prev !== undefined) {
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prev.include_footer = true;
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}
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message.subscribed = false;
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message.unsubscribed = false;
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if (message.include_bookend && message.historical !== prev.historical) {
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if (message.historical) {
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message.unsubscribed = message.stream;
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} else {
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message.subscribed = message.stream;
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}
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}
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}
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message.include_sender = true;
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if (!message.include_recipient &&
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util.same_sender(prev, message)) {
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message.include_sender = false;
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ids_where_next_is_same_sender[prev.id] = true;
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}
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if (message.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.last_edit_timestamp * 1000);
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message.last_edit_timestr =
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(timerender.render_date(last_edit_time))[0].outerHTML
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+ " " + last_edit_time.toString("HH:mm");
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}
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message.dom_id = table_name + message.id;
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message.small_avatar_url = ui.small_avatar_url(message);
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if (message.is_stream) {
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message.background_color = subs.get_color(message.stream);
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message.color_class = subs.get_color_class(message.background_color);
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message.invite_only = subs.get_invite_only(message.stream);
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}
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message.contains_mention = notifications.speaking_at_me(message);
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message.unread = unread.message_unread(message);
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messages_to_render.push(message);
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prev = message;
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self.last_message_historical = message.historical;
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});
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if (prev) {
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prev.include_footer = true;
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}
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if (messages_to_render.length === 0) {
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return;
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}
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if (current_group.length > 0)
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new_message_groups.push(current_group);
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if (where === 'top') {
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this._message_groups = new_message_groups.concat(this._message_groups);
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} else {
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this._message_groups = this._message_groups.concat(new_message_groups);
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}
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var rendered_elems = $(templates.render('message', {
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messages: messages_to_render,
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include_layout_row: (table.find('tr:first').length === 0),
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use_match_properties: this.filter.is_search()
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}));
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$.each(rendered_elems, function (index, elem) {
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var row = $(elem);
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if (! row.hasClass('message_row')) {
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return;
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}
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var id = rows.id(row);
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if (ids_where_next_is_same_sender[id]) {
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row.find('.messagebox').addClass("next_is_same_sender");
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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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var email = $(this).attr('data-user-email');
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if (email === '*' || email === page_params.email) {
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$(this).addClass('user-mention-me');
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}
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});
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}
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});
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// The message that was last before this batch came in has to be
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// handled specially because we didn't just render it and
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// therefore have to lookup its associated element
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// If the previous message was part of the same block but
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// had a footer, we need to remove it.
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if (last_message_id !== undefined) {
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var row = rows.get(last_message_id, table_name);
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if (ids_where_next_is_same_sender[last_message_id]) {
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row.find('.messagebox').addClass("next_is_same_sender");
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}
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// We didn't actually rerender the original last message,
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// but we might have set .include_footer=false for it in
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// the above loop since it was the previous message for
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// messages[0]. If so, we need to update the DOM.
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if (this.get(last_message_id) && ! this.get(last_message_id).include_footer) {
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row.removeClass('last_message');
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}
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}
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if (where === 'top' && table.find('.ztable_layout_row').length > 0) {
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// If we have a totally empty narrow, there may not
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// be a .ztable_layout_row.
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table.find('.ztable_layout_row').after(rendered_elems);
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} else {
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table.append(rendered_elems);
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this.update_trailing_bookend();
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// XXX: This is absolutely awful. There is a firefox bug
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// where when table rows as DOM elements are appended (as
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// opposed to as a string) a border is sometimes added to the
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// row. This border goes away if we add a dummy row to the
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// top of the table (it doesn't go away on any reflow,
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// though, as resizing the window doesn't make them go away).
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// So, we add an empty row and then garbage collect them
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// later when the user is idle.
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var dummy = $("<tr></tr>");
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table.find('.ztable_layout_row').after(dummy);
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$(document).idle({'idle': 1000*10,
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'onIdle': function () {
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dummy.remove();
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}});
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}
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$.each(rendered_elems, function (idx, elem) {
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var row = $(elem);
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if (! row.hasClass('message_row')) {
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return;
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}
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var id = rows.id(row);
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message_edit.maybe_show_edit(row, id);
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});
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// Must happen after the elements are inserted into the document for
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// getBoundingClientRect to work.
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$.each(rendered_elems, ui.process_condensing);
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// Must happen after anything that changes the height of messages has
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// taken effect.
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if (where === 'top' && this === current_msg_list && orig_scrolltop_offset !== undefined) {
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// Restore the selected row to its original position in
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// relation to the top of the window
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viewport.scrollTop(this.selected_row().offset().top - orig_scrolltop_offset);
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this.select_id(this._selected_id, {from_rendering: true});
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}
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// Re-add the fading of messages that is lost when we re-render.
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compose.update_faded_messages();
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if (this === current_msg_list && messages_are_new) {
|
|
this._maybe_autoscroll(rendered_elems);
|
|
}
|
|
},
|
|
|
|
_maybe_autoscroll: function MessageList__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 selected_row = current_msg_list.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 = 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;
|
|
}
|
|
|
|
var new_messages_height = 0;
|
|
$.each(rendered_elems, function () {
|
|
// Sometimes there are non-DOM elements in rendered_elems; only
|
|
// try to get the heights of actual trs.
|
|
if ($(this).is("tr")) {
|
|
new_messages_height += $(this).height();
|
|
}
|
|
});
|
|
|
|
if (new_messages_height <= 0) {
|
|
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.
|
|
viewport.system_initiated_animate_scroll(scroll_amount);
|
|
},
|
|
|
|
clear_trailing_bookend: function MessageList_clear_trailing_bookend() {
|
|
var trailing_bookend = rows.get_table(this.table_name).find('#trailing_bookend');
|
|
trailing_bookend.remove();
|
|
},
|
|
|
|
// Maintains a trailing bookend element explaining any changes in
|
|
// your subscribed/unsubscribed status at the bottom of the
|
|
// message list.
|
|
update_trailing_bookend: function MessageList_update_trailing_bookend() {
|
|
this.clear_trailing_bookend();
|
|
if (!this.narrowed) {
|
|
return;
|
|
}
|
|
var stream = narrow.stream();
|
|
if (stream === undefined) {
|
|
return;
|
|
}
|
|
var trailing_bookend_content, subscribed = subs.is_subscribed(stream);
|
|
if (subscribed) {
|
|
if (this.last_message_historical) {
|
|
trailing_bookend_content = "--- Subscribed to stream " + stream + " ---";
|
|
}
|
|
} else {
|
|
if (!this.last_message_historical) {
|
|
trailing_bookend_content = "--- Unsubscribed from stream " + stream + " ---";
|
|
} else {
|
|
trailing_bookend_content = "--- Not subscribed to stream " + stream + " ---";
|
|
}
|
|
}
|
|
if (trailing_bookend_content !== undefined) {
|
|
var rendered_trailing_bookend = $(templates.render('trailing_bookend', {
|
|
trailing_bookend: trailing_bookend_content
|
|
}));
|
|
rows.get_table(this.table_name).append(rendered_trailing_bookend);
|
|
}
|
|
},
|
|
|
|
append: function MessageList_append(messages, messages_are_new) {
|
|
this._items = this._items.concat(messages);
|
|
this._add_to_hash(messages);
|
|
|
|
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 recieved message should trigger a rerender so that
|
|
// the new message, which will appear in the viewable area,
|
|
// is rendered.
|
|
this._maybe_rerender();
|
|
},
|
|
|
|
prepend: function MessageList_prepend(messages) {
|
|
this._items = messages.concat(this._items);
|
|
this._add_to_hash(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 slice_to_render = messages.slice(0, this._RENDER_WINDOW_SIZE - cur_window_size);
|
|
this._render(slice_to_render, 'top', false);
|
|
this._render_win_start -= slice_to_render.length;
|
|
}
|
|
},
|
|
|
|
add_and_rerender: function MessageList_add_and_rerender(messages) {
|
|
// To add messages that might be in the interior of our
|
|
// existing messages list, we just add the new messages and
|
|
// then rerender the whole thing.
|
|
this._items = messages.concat(this._items);
|
|
this._items.sort(function (a, b) {return a.id - b.id;});
|
|
this._add_to_hash(messages);
|
|
|
|
this._clear_rendering_state(true);
|
|
|
|
this._update_render_window(this._selected_idx(), false);
|
|
|
|
this._render(this._items.slice(this._render_win_start,
|
|
this._render_win_end), 'bottom');
|
|
},
|
|
|
|
show_edit_message: function MessageList_show_edit_message(row, edit_obj) {
|
|
row.find(".message_edit_form").empty().append(edit_obj.form);
|
|
row.find(".message_content").hide();
|
|
row.find(".message_edit").show();
|
|
row.find(".message_edit_content").autosize();
|
|
},
|
|
|
|
hide_edit_message: function MessageList_hide_edit_message(row) {
|
|
row.find(".message_content").show();
|
|
row.find(".message_edit").hide();
|
|
},
|
|
|
|
show_message_as_read: function (message) {
|
|
rows.get(message.id, this.table_name).removeClass('unread');
|
|
},
|
|
|
|
rerender: function MessageList_rerender() {
|
|
// We need to clear the rendering state, rather than just
|
|
// doing _clear_table, since we want to potentially recollapse
|
|
// things.
|
|
this._clear_rendering_state(false);
|
|
this._update_render_window(this._selected_idx(), false);
|
|
this._rerender_preserving_scrolltop();
|
|
if (this._selected_id !== -1) {
|
|
this.select_id(this._selected_id);
|
|
}
|
|
},
|
|
|
|
all: function MessageList_all() {
|
|
return this._items;
|
|
}
|
|
};
|
|
|
|
// We stop autoscrolling when the user is clearly in the middle of
|
|
// doing something. Be careful, though, if you try to capture
|
|
// mousemove, then you will have to contend with the autoscroll
|
|
// itself generating mousemove events.
|
|
$(document).on('message_selected.zephyr hashchange.zephyr mousewheel', function (event) {
|
|
viewport.stop_auto_scrolling();
|
|
});
|
|
}());
|
|
/*jslint nomen: false */
|