mirror of https://github.com/zulip/zulip.git
468 lines
15 KiB
JavaScript
468 lines
15 KiB
JavaScript
var narrow = (function () {
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var exports = {};
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var current_filter;
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// A small concession to unit testing follows:
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exports._set_current_filter = function (filter) {
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current_filter = filter;
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};
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exports.active = function () {
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return current_filter !== undefined;
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};
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exports.filter = function () {
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return current_filter;
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};
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exports.predicate = function () {
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if (current_filter === undefined) {
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return function () { return true; };
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}
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return current_filter.predicate();
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};
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exports.operators = function () {
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if (current_filter === undefined) {
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return [];
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}
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return current_filter.operators();
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};
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/* Operators we should send to the server. */
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exports.public_operators = function () {
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if (current_filter === undefined) {
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return undefined;
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}
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return current_filter.public_operators();
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};
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exports.search_string = function () {
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return Filter.unparse(exports.operators());
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};
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// Collect operators which appear only once into an object,
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// and discard those which appear more than once.
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function collect_single(operators) {
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var seen = new Dict();
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var result = new Dict();
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_.each(operators, function (elem) {
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var key = elem[0];
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if (seen.has(key)) {
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result.del(key);
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} else {
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result.set(key, elem[1]);
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seen.set(key, true);
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}
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});
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return result;
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}
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// Modify default compose parameters (stream etc.) based on
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// the current narrowed view.
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//
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// This logic is here and not in the 'compose' module because
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// it will get more complicated as we add things to the narrow
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// operator language.
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exports.set_compose_defaults = function (opts) {
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var single = collect_single(exports.operators());
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// Set the stream, subject, and/or PM recipient if they are
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// uniquely specified in the narrow view.
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if (single.has('stream')) {
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opts.stream = stream_data.get_name(single.get('stream'));
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}
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if (single.has('topic')) {
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opts.subject = single.get('topic');
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}
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if (single.has('pm-with')) {
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opts.private_message_recipient = single.get('pm-with');
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}
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};
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exports.stream = function () {
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if (current_filter === undefined) {
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return undefined;
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}
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var stream_operands = current_filter.operands("stream");
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if (stream_operands.length === 1) {
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return stream_operands[0];
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}
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return undefined;
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};
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exports.activate = function (operators, opts) {
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if (operators.length === 0) {
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return exports.deactivate();
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}
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var filter = new Filter(operators);
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opts = _.defaults({}, opts, {
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then_select_id: home_msg_list.selected_id(),
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select_first_unread: false,
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change_hash: true,
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trigger: 'unknown'
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});
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if (filter.has_operator("near")) {
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opts.then_select_id = filter.operands("near")[0];
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opts.select_first_unread = false;
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}
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if (filter.has_operator("id")) {
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opts.then_select_id = filter.operands("id")[0];
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opts.select_first_unread = false;
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}
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if (opts.then_select_id === -1) {
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// If we're loading the page via a narrowed URL, we may not
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// have setup the home view yet. In that case, use the
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// initial pointer. We can remove this code if we later move
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// to a model where home_msg_list.selected_id() is always
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// initialized early.
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opts.then_select_id = page_params.initial_pointer;
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opts.select_first_unread = false;
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}
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var was_narrowed_already = exports.active();
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var then_select_id = opts.then_select_id;
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var then_select_offset;
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if (!opts.select_first_unread && current_msg_list.get_row(then_select_id).length > 0) {
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then_select_offset = current_msg_list.get_row(then_select_id).offset().top -
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viewport.scrollTop();
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}
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if (!was_narrowed_already) {
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message_tour.start_tour(current_msg_list.selected_id());
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}
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// For legacy reasons, we need to set current_filter before calling
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// muting_enabled.
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current_filter = filter;
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var muting_enabled = exports.muting_enabled();
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// Save how far from the pointer the top of the message list was.
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if (current_msg_list.selected_id() !== -1) {
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current_msg_list.pre_narrow_offset = current_msg_list.selected_row().offset().top - viewport.scrollTop();
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}
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var can_summarize = feature_flags.summarize_read_while_narrowed
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&& !current_filter.is_search() && !exports.narrowed_by_reply();
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narrowed_msg_list = new MessageList('zfilt', current_filter, {
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collapse_messages: ! current_filter.is_search(),
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muting_enabled: muting_enabled,
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summarize_read: can_summarize ? 'stream' : false
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});
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current_msg_list = narrowed_msg_list;
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function maybe_select_closest() {
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if (! narrowed_msg_list.empty()) {
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if (opts.select_first_unread) {
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then_select_id = narrowed_msg_list.last().id;
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var first_unread = _.find(narrowed_msg_list.all(),
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unread.message_unread);
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if (first_unread) {
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then_select_id = first_unread.id;
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}
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}
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var preserve_pre_narrowing_screen_position =
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!opts.select_first_unread &&
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(narrowed_msg_list.get(then_select_id) !== undefined) &&
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(then_select_offset !== undefined);
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var then_scroll = !preserve_pre_narrowing_screen_position;
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narrowed_msg_list.select_id(then_select_id, {then_scroll: then_scroll,
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use_closest: true
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});
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if (preserve_pre_narrowing_screen_position) {
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// Scroll so that the selected message is in the same
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// position in the viewport as it was prior to
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// narrowing
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viewport.scrollTop(narrowed_msg_list.get_row(then_select_id).offset().top
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- then_select_offset);
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}
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}
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}
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// Don't bother populating a message list when it won't contain
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// the message we want anyway or if the filter can't be applied
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// locally.
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if (all_msg_list.get(then_select_id) !== undefined && current_filter.can_apply_locally()) {
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add_messages(all_msg_list.all(), narrowed_msg_list);
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}
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var defer_selecting_closest = narrowed_msg_list.empty();
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load_old_messages({
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anchor: then_select_id,
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num_before: 50,
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num_after: 50,
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msg_list: narrowed_msg_list,
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cont: function (messages) {
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if (defer_selecting_closest) {
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maybe_select_closest();
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}
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},
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cont_will_add_messages: false
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});
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// Show the new set of messages.
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$("body").addClass("narrowed_view");
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$("#zfilt").addClass("focused_table");
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$("#zhome").removeClass("focused_table");
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// Deal with message condensing/uncondensing.
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// In principle, this code causes us to scroll around because divs
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// above us could change size -- which is problematic, because it
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// could cause us to lose our position. But doing this here, right
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// after showing the table, seems to cause us to win the race.
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_.each($("tr.message_row"), ui.process_condensing);
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reset_load_more_status();
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if (! defer_selecting_closest) {
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maybe_select_closest();
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}
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// Put the narrow operators in the URL fragment.
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// Disabled when the URL fragment was the source
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// of this narrow.
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if (opts.change_hash) {
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hashchange.save_narrow(operators);
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}
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// Put the narrow operators in the search bar.
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$('#search_query').val(Filter.unparse(operators));
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search.update_button_visibility();
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compose.update_recipient_on_narrow();
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compose_fade.update_message_list();
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$(document).trigger($.Event('narrow_activated.zulip', {msg_list: narrowed_msg_list,
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filter: current_filter,
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trigger: opts.trigger}));
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};
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// Activate narrowing with a single operator.
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// This is just for syntactic convenience.
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exports.by = function (operator, operand, opts) {
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exports.activate([[operator, operand]], opts);
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};
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exports.by_subject = function (target_id, opts) {
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var original = current_msg_list.get(target_id);
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if (original.type !== 'stream') {
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// Only stream messages have subjects, but the
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// user wants us to narrow in some way.
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exports.by_recipient(target_id, opts);
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return;
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}
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mark_message_as_read(original);
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opts = _.defaults({}, opts, {then_select_id: target_id});
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exports.activate([
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['stream', original.stream],
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['topic', original.subject]
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], opts);
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};
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// Called for the 'narrow by stream' hotkey.
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exports.by_recipient = function (target_id, opts) {
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opts = _.defaults({}, opts, {then_select_id: target_id});
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var message = current_msg_list.get(target_id);
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mark_message_as_read(message);
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switch (message.type) {
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case 'private':
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exports.by('pm-with', message.reply_to, opts);
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break;
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case 'stream':
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exports.by('stream', message.stream, opts);
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break;
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}
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};
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exports.by_time_travel = function (target_id, opts) {
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opts = _.defaults({}, opts, {then_select_id: target_id});
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narrow.activate([["near", target_id]], opts);
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};
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exports.deactivate = function () {
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if (current_filter === undefined) {
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return;
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}
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if (ui.actively_scrolling()) {
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// There is no way to intercept in-flight scroll events, and they will
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// cause you to end up in the wrong place if you are actively scrolling
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// on an unnarrow. Wait a bit and try again once the scrolling is over.
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setTimeout(exports.deactivate, 50);
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return;
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}
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current_filter = undefined;
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exports.hide_empty_narrow_message();
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$("body").removeClass('narrowed_view');
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$("#zfilt").removeClass('focused_table');
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$("#zhome").addClass('focused_table');
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$('#search_query').val('');
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reset_load_more_status();
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var visited_messages = message_tour.get_tour();
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home_msg_list.advance_past_messages(visited_messages);
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message_tour.finish_tour();
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current_msg_list = home_msg_list;
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var preserve_pre_narrowing_screen_position =
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(current_msg_list.selected_row().length > 0) &&
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(current_msg_list.pre_narrow_offset !== undefined);
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if (feature_flags.summarize_read_while_narrowed) {
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// TODO: avoid a full re-render
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// Necessary to replace messages read in the narrow with summary blocks
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current_msg_list.start_summary_exemption();
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current_msg_list.rerender();
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}
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// We fall back to the closest selected id, if the user has removed a stream from the home
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// view since leaving it the old selected id might no longer be there
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current_msg_list.select_id(current_msg_list.selected_id(), {
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then_scroll: !preserve_pre_narrowing_screen_position,
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use_closest: true
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});
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if (preserve_pre_narrowing_screen_position) {
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// We scroll the user back to exactly the offset from the selected
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// message that he was at the time that he narrowed.
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// TODO: Make this correctly handle the case of resizing while narrowed.
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viewport.scrollTop(current_msg_list.selected_row().offset().top - current_msg_list.pre_narrow_offset);
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}
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hashchange.save_narrow();
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compose_fade.update_message_list();
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$(document).trigger($.Event('narrow_deactivated.zulip', {msg_list: current_msg_list}));
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};
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exports.restore_home_state = function () {
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// If we click on the Home link while already at Home, unnarrow.
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// If we click on the Home link from another nav pane, just go
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// back to the state you were in (possibly still narrowed) before
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// you left the Home pane.
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if (!ui.home_tab_obscured()) {
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exports.deactivate();
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}
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maybe_scroll_to_selected();
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};
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function pick_empty_narrow_banner() {
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var default_banner = $('#empty_narrow_message');
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if (current_filter === undefined) {
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return default_banner;
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}
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var first_operator = current_filter.operators()[0][0];
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var first_operand = current_filter.operators()[0][1];
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if (first_operator === "is") {
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if (first_operand === "starred") {
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// You have no starred messages.
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return $("#empty_star_narrow_message");
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} else if (first_operand === "mentioned") {
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return $("#empty_narrow_all_mentioned");
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} else if (first_operand === "private") {
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// You have no private messages.
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return $("#empty_narrow_all_private_message");
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}
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} else if ((first_operator === "stream") && !stream_data.is_subscribed(first_operand)) {
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// You are narrowed to a stream to which you aren't subscribed.
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return $("#nonsubbed_stream_narrow_message");
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} else if (first_operator === "search") {
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// You are narrowed to empty search results.
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return $("#empty_search_narrow_message");
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} else if (first_operator === "pm-with") {
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if (first_operand.indexOf(',') === -1) {
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// You have no private messages with this person
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return $("#empty_narrow_private_message");
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} else {
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return $("#empty_narrow_multi_private_message");
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}
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}
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return default_banner;
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}
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exports.show_empty_narrow_message = function () {
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$(".empty_feed_notice").hide();
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pick_empty_narrow_banner().show();
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};
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exports.hide_empty_narrow_message = function () {
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$(".empty_feed_notice").hide();
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};
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exports.pm_with_uri = function (reply_to) {
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return "#narrow/pm-with/" + hashchange.encodeHashComponent(reply_to);
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};
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exports.by_stream_uri = function (stream) {
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return "#narrow/stream/" + hashchange.encodeHashComponent(stream);
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};
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exports.by_stream_subject_uri = function (stream, subject) {
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return "#narrow/stream/" + hashchange.encodeHashComponent(stream) +
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"/subject/" + hashchange.encodeHashComponent(subject);
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};
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// Are we narrowed to PMs: all PMs or PMs with particular people.
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exports.narrowed_to_pms = function () {
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if (current_filter === undefined) {
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return false;
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}
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return (current_filter.has_operator("pm-with") ||
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current_filter.has_operand("is", "private"));
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};
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// We auto-reply under certain conditions, namely when you're narrowed
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// to a PM (or huddle), and when you're narrowed to some stream/subject pair
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exports.narrowed_by_reply = function () {
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if (current_filter === undefined) {
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return false;
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}
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var operators = current_filter.operators();
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return ((operators.length === 1 &&
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current_filter.operands("pm-with").length === 1) ||
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(operators.length === 2 &&
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current_filter.operands("stream").length === 1 &&
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current_filter.operands("topic").length === 1));
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};
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exports.narrowed_to_topic = function () {
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if (current_filter === undefined) {
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return false;
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}
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return (current_filter.has_operator("stream") &&
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current_filter.has_operator("topic"));
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};
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exports.narrowed_to_search = function () {
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return (current_filter !== undefined) && current_filter.is_search();
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};
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exports.muting_enabled = function () {
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return (!exports.narrowed_to_topic() && !exports.narrowed_to_search() && !exports.narrowed_to_pms());
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};
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return exports;
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}());
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if (typeof module !== 'undefined') {
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module.exports = narrow;
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}
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