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			830 lines
		
	
	
		
			30 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			830 lines
		
	
	
		
			30 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
/*jslint nomen: true */
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function MessageList(table_name, filter, opts) {
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    _.extend(this, {
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        collapse_messages: true,
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        summarize_read: false
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    }, 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.zulip', 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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    summary_is_selected: function () {
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        return this._is_summarized_message(this.selected_message());
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    },
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    closest_id: function MessageList_closest_id(id) {
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        var items = this._items;
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        if (items.length === 0) {
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            return -1;
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        }
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        var closest = util.lower_bound(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 === items.length
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            || (closest !== 0
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                && (id - items[closest - 1].id <
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                    items[closest].id - id)))
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        {
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            closest = closest - 1;
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        }
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        return 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 (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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    _is_summarized_message: function (message) {
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        if (!feature_flags.summarize_read_while_narrowed ||
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            message === undefined || message.flags === undefined) {
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            return false;
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        }
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        if (this.summarize_read === 'home') {
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            return message.flags.indexOf('summarize_in_home') !== -1;
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        } else if (this.summarize_read === 'stream' ) {
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            return message.flags.indexOf('summarize_in_stream') !== -1;
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        } else {
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            return false;
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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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        // 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 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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        var summary_group = {};
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        var has_summary = false;
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        var summary_start_id = 0;
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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 (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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            var last_row = table.find('tr[zid]:last');
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            last_message_id = rows.id(last_row);
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            prev = this.get(last_message_id);
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            if (last_row.is('.summary_row')) {
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                // Don't group with a summary, but don't put separators before the new message
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                prev = _.pick(prev, 'timestamp', 'historical');
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            }
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        }
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        function set_template_properties(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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        }
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        function finish_summary() {
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            var first = true;
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            _.each(summary_group, function (summary_row) {
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                summary_row.count = summary_row.messages.length;
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                summary_row.message_ids = _.pluck(summary_row.messages, 'id').join(' ');
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                if (first) {
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                    summary_row.include_bookend = true;
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                    first = false;
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                }
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                set_template_properties(summary_row);
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                messages_to_render.push(summary_row);
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                prev = summary_row;
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            });
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            prev.include_footer = true;
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            has_summary = false;
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            summary_group = {};
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            prev = _.pick(prev, 'timestamp', 'historical');
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        }
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        _.each(messages, function (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 (has_summary && message.show_date) {
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                finish_summary();
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            }
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            if (self._is_summarized_message(message)) {
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                if (prev) {
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                    prev.include_footer = true;
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                }
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                var key = util.recipient_key(message);
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                if (summary_group[key] === undefined) {
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                    // Start building a new summary row for messages from this recipient.
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                    //
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                    // Ugly: handlebars renderer only takes messages. We don't want to modify
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                    // the original message, so we make a fake message based on the real one
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                    // that will trigger the right part of the handlebars template and won't
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                    // show the content, date, etc. from the real message.
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                    summary_group[key] = $.extend({}, message, {
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                        first_message_id: message.id,
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                        is_summary: true,
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                        include_recipient: true,
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                        include_sender: false,
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                        messages: [message]
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                    });
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                } else {
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                    summary_group[key].messages.push(message);
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                }
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                has_summary = true;
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                prev = message;
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                return;
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            } else if (has_summary) {
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                finish_summary();
 | 
						|
            }
 | 
						|
 | 
						|
            if (util.same_recipient(prev, message) && self.collapse_messages &&
 | 
						|
               prev.historical === message.historical && !message.show_date) {
 | 
						|
                current_group.push(message.id);
 | 
						|
                // prev is no longer the last element in this block
 | 
						|
                prev.include_footer = false;
 | 
						|
            } else {
 | 
						|
                if (current_group.length > 0) {
 | 
						|
                    new_message_groups.push(current_group);
 | 
						|
                }
 | 
						|
                current_group = [message.id];
 | 
						|
 | 
						|
                // Add a space to the table, but not for the first element.
 | 
						|
                message.include_recipient = true;
 | 
						|
                message.include_bookend   = (prev !== undefined);
 | 
						|
                if (prev !== undefined) {
 | 
						|
                    prev.include_footer = true;
 | 
						|
                }
 | 
						|
                message.subscribed = false;
 | 
						|
                message.unsubscribed = false;
 | 
						|
                if (message.include_bookend && message.historical !== prev.historical) {
 | 
						|
                    if (message.historical) {
 | 
						|
                        message.unsubscribed = message.stream;
 | 
						|
                    } else {
 | 
						|
                        message.subscribed = message.stream;
 | 
						|
                    }
 | 
						|
                }
 | 
						|
            }
 | 
						|
 | 
						|
            message.include_sender = true;
 | 
						|
            if (!message.include_recipient &&
 | 
						|
                util.same_sender(prev, message)) {
 | 
						|
                message.include_sender = false;
 | 
						|
                ids_where_next_is_same_sender[prev.id] = true;
 | 
						|
            }
 | 
						|
 | 
						|
            if (message.last_edit_timestamp !== undefined) {
 | 
						|
                // Add or update the last_edit_timestr
 | 
						|
                var last_edit_time = new XDate(message.last_edit_timestamp * 1000);
 | 
						|
                message.last_edit_timestr =
 | 
						|
                    (timerender.render_date(last_edit_time))[0].outerHTML
 | 
						|
                    + " " + last_edit_time.toString("HH:mm");
 | 
						|
            }
 | 
						|
 | 
						|
            message.dom_id = table_name + message.id;
 | 
						|
 | 
						|
            message.small_avatar_url = ui.small_avatar_url(message);
 | 
						|
 | 
						|
            set_template_properties(message);
 | 
						|
 | 
						|
            message.contains_mention = notifications.speaking_at_me(message);
 | 
						|
            message.unread = unread.message_unread(message);
 | 
						|
 | 
						|
            messages_to_render.push(message);
 | 
						|
            prev = message;
 | 
						|
            self.last_message_historical = message.historical;
 | 
						|
        });
 | 
						|
 | 
						|
        if (prev) {
 | 
						|
            prev.include_footer = true;
 | 
						|
        }
 | 
						|
        if (messages_to_render.length === 0) {
 | 
						|
            return;
 | 
						|
        }
 | 
						|
 | 
						|
        if (has_summary) {
 | 
						|
            finish_summary();
 | 
						|
        }
 | 
						|
 | 
						|
        if (current_group.length > 0) {
 | 
						|
            new_message_groups.push(current_group);
 | 
						|
        }
 | 
						|
 | 
						|
        if (where === 'top') {
 | 
						|
            this._message_groups = new_message_groups.concat(this._message_groups);
 | 
						|
        } else {
 | 
						|
            this._message_groups = this._message_groups.concat(new_message_groups);
 | 
						|
        }
 | 
						|
 | 
						|
        var rendered_elems = $(templates.render('message', {
 | 
						|
            messages: messages_to_render,
 | 
						|
            include_layout_row: (table.find('tr:first').length === 0),
 | 
						|
            use_match_properties: this.filter.is_search()
 | 
						|
        }));
 | 
						|
 | 
						|
        _.each(rendered_elems, function (elem) {
 | 
						|
            var row = $(elem);
 | 
						|
            if (! row.hasClass('message_row')) {
 | 
						|
                return;
 | 
						|
            }
 | 
						|
            var id = rows.id(row);
 | 
						|
            if (ids_where_next_is_same_sender[id]) {
 | 
						|
                row.find('.messagebox').addClass("next_is_same_sender");
 | 
						|
            }
 | 
						|
 | 
						|
            if (row.hasClass('mention')) {
 | 
						|
                row.find('.user-mention').each(function () {
 | 
						|
                    var email = $(this).attr('data-user-email');
 | 
						|
                    if (email === '*' || email === page_params.email) {
 | 
						|
                        $(this).addClass('user-mention-me');
 | 
						|
                    }
 | 
						|
                });
 | 
						|
            }
 | 
						|
        });
 | 
						|
 | 
						|
        // The message that was last before this batch came in has to be
 | 
						|
        // handled specially because we didn't just render it and
 | 
						|
        // therefore have to lookup its associated element
 | 
						|
        // If the previous message was part of the same block but
 | 
						|
        // had a footer, we need to remove it.
 | 
						|
        if (last_message_id !== undefined) {
 | 
						|
            var row = rows.get(last_message_id, table_name);
 | 
						|
            if (ids_where_next_is_same_sender[last_message_id]) {
 | 
						|
                row.find('.messagebox').addClass("next_is_same_sender");
 | 
						|
            }
 | 
						|
            // We didn't actually rerender the original last message,
 | 
						|
            // but we might have set .include_footer=false for it in
 | 
						|
            // the above loop since it was the previous message for
 | 
						|
            // messages[0].  If so, we need to update the DOM.
 | 
						|
            if (this.get(last_message_id) && ! this.get(last_message_id).include_footer) {
 | 
						|
                row.removeClass('last_message');
 | 
						|
            }
 | 
						|
        }
 | 
						|
 | 
						|
        if (where === 'top' && table.find('.ztable_layout_row').length > 0) {
 | 
						|
            // If we have a totally empty narrow, there may not
 | 
						|
            // be a .ztable_layout_row.
 | 
						|
            table.find('.ztable_layout_row').after(rendered_elems);
 | 
						|
        } else {
 | 
						|
            table.append(rendered_elems);
 | 
						|
 | 
						|
            this.update_trailing_bookend();
 | 
						|
 | 
						|
            // XXX: This is absolutely awful.  There is a firefox bug
 | 
						|
            // where when table rows as DOM elements are appended (as
 | 
						|
            // opposed to as a string) a border is sometimes added to the
 | 
						|
            // row.  This border goes away if we add a dummy row to the
 | 
						|
            // top of the table (it doesn't go away on any reflow,
 | 
						|
            // though, as resizing the window doesn't make them go away).
 | 
						|
            // So, we add an empty row and then garbage collect them
 | 
						|
            // later when the user is idle.
 | 
						|
            var dummy = $("<tr></tr>");
 | 
						|
            table.find('.ztable_layout_row').after(dummy);
 | 
						|
            $(document).idle({'idle': 1000*10,
 | 
						|
                              'onIdle': function () {
 | 
						|
                                  dummy.remove();
 | 
						|
                              }});
 | 
						|
        }
 | 
						|
 | 
						|
        _.each(rendered_elems, function (elem) {
 | 
						|
            var row = $(elem);
 | 
						|
            if (! row.hasClass('message_row')) {
 | 
						|
                return;
 | 
						|
            }
 | 
						|
            var id = rows.id(row);
 | 
						|
            message_edit.maybe_show_edit(row, id);
 | 
						|
        });
 | 
						|
 | 
						|
        // Must happen after the elements are inserted into the document for
 | 
						|
        // getBoundingClientRect to work.
 | 
						|
        _.each(rendered_elems, ui.process_condensing);
 | 
						|
 | 
						|
        // Must happen after anything that changes the height of messages has
 | 
						|
        // taken effect.
 | 
						|
        if (where === 'top' && this === current_msg_list && orig_scrolltop_offset !== undefined) {
 | 
						|
            // Restore the selected row to its original position in
 | 
						|
            // relation to the top of the window
 | 
						|
            viewport.scrollTop(this.selected_row().offset().top - orig_scrolltop_offset);
 | 
						|
            this.select_id(this._selected_id, {from_rendering: true});
 | 
						|
        }
 | 
						|
 | 
						|
        // Re-add the fading of messages that is lost when we re-render.
 | 
						|
        compose.update_faded_messages();
 | 
						|
 | 
						|
        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 (elem) {
 | 
						|
            // Sometimes there are non-DOM elements in rendered_elems; only
 | 
						|
            // try to get the heights of actual trs.
 | 
						|
            if ($(elem).is("tr")) {
 | 
						|
                new_messages_height += $(elem).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, options) {
 | 
						|
        var row = rows.get(message.id, this.table_name);
 | 
						|
        if (options.from === 'pointer' && feature_flags.mark_read_at_bottom) {
 | 
						|
            row.find('.unread_marker').addClass('fast_fade');
 | 
						|
        } else {
 | 
						|
            row.find('.unread_marker').addClass('slow_fade');
 | 
						|
        }
 | 
						|
        row.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.zulip hashchange.zulip mousewheel', function (event) {
 | 
						|
    viewport.stop_auto_scrolling();
 | 
						|
});
 | 
						|
}());
 | 
						|
/*jslint nomen: false */
 | 
						|
if (typeof module !== 'undefined') {
 | 
						|
    module.exports = MessageList;
 | 
						|
}
 |