mirror of https://github.com/zulip/zulip.git
85 lines
2.2 KiB
JavaScript
85 lines
2.2 KiB
JavaScript
const FetchStatus = function () {
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const self = {};
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let loading_older = false;
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let loading_newer = false;
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let found_oldest = false;
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let found_newest = false;
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let history_limited = false;
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let expected_max_message_id = 0;
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function max_id_for_messages(messages) {
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let max_id = 0;
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for (const msg of messages) {
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max_id = Math.max(max_id, msg.id);
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}
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return max_id;
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}
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self.start_older_batch = function (opts) {
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loading_older = true;
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if (opts.update_loading_indicator) {
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message_scroll.show_loading_older();
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}
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};
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self.finish_older_batch = function (opts) {
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loading_older = false;
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found_oldest = opts.found_oldest;
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history_limited = opts.history_limited;
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if (opts.update_loading_indicator) {
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message_scroll.hide_loading_older();
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}
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};
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self.can_load_older_messages = function () {
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return !loading_older && !found_oldest;
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};
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self.has_found_oldest = function () {
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return found_oldest;
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};
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self.history_limited = function () {
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return history_limited;
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};
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self.start_newer_batch = function (opts) {
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loading_newer = true;
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if (opts.update_loading_indicator) {
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message_scroll.show_loading_newer();
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}
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};
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self.finish_newer_batch = function (messages, opts) {
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const found_max_message_id = max_id_for_messages(messages);
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if (opts.found_newest && expected_max_message_id > found_max_message_id) {
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opts.found_newest = false;
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}
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loading_newer = false;
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found_newest = opts.found_newest;
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if (opts.update_loading_indicator) {
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message_scroll.hide_loading_newer();
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}
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};
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self.can_load_newer_messages = function () {
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return !loading_newer && !found_newest;
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};
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self.has_found_newest = function () {
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return found_newest;
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};
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self.update_expected_max_message_id = function (messages) {
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expected_max_message_id = Math.max(expected_max_message_id,
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max_id_for_messages(messages));
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};
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return self;
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};
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module.exports = FetchStatus;
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window.FetchStatus = FetchStatus;
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