mirror of https://github.com/zulip/zulip.git
125 lines
4.0 KiB
JavaScript
125 lines
4.0 KiB
JavaScript
// See https://zulip.readthedocs.io/en/latest/subsystems/pointer.html for notes on
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// how this system is designed.
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var pointer = (function () {
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var exports = {};
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exports.recenter_pointer_on_display = false;
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// Toggles re-centering the pointer in the window
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// when All Messages is next clicked by the user
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exports.suppress_scroll_pointer_update = false;
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exports.furthest_read = -1;
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exports.server_furthest_read = -1;
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var pointer_update_in_flight = false;
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function update_pointer() {
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if (!pointer_update_in_flight) {
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pointer_update_in_flight = true;
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return channel.post({
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url: '/json/users/me/pointer',
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idempotent: true,
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data: {pointer: pointer.furthest_read},
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success: function () {
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pointer.server_furthest_read = pointer.furthest_read;
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pointer_update_in_flight = false;
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},
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error: function () {
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pointer_update_in_flight = false;
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},
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});
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}
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// Return an empty, resolved Deferred.
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return $.when();
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}
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exports.send_pointer_update = function () {
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// Only bother if you've read new messages.
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if (pointer.furthest_read > pointer.server_furthest_read) {
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update_pointer();
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}
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};
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function unconditionally_send_pointer_update() {
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if (pointer_update_in_flight) {
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// Keep trying.
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var deferred = $.Deferred();
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setTimeout(function () {
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deferred.resolve(unconditionally_send_pointer_update());
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}, 100);
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return deferred;
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}
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return update_pointer();
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}
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exports.fast_forward_pointer = function () {
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channel.get({
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url: '/json/users/me',
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idempotent: true,
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success: function (data) {
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unread_ops.mark_all_as_read(function () {
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pointer.furthest_read = data.max_message_id;
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unconditionally_send_pointer_update().then(function () {
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reload.initiate({immediate: true,
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save_pointer: false,
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save_narrow: true,
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save_compose: true});
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});
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});
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},
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});
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};
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exports.initialize = function initialize() {
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pointer.server_furthest_read = page_params.pointer;
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if (page_params.orig_initial_pointer !== undefined &&
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page_params.orig_initial_pointer > pointer.server_furthest_read) {
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pointer.server_furthest_read = page_params.orig_initial_pointer;
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}
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pointer.furthest_read = pointer.server_furthest_read;
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// We only send pointer updates when the user has been idle for a
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// short while to avoid hammering the server
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$(document).idle({idle: 1000,
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onIdle: pointer.send_pointer_update,
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keepTracking: true});
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$(document).on('message_selected.zulip', function (event) {
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// Only advance the pointer when not narrowed
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if (event.id === -1) {
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return;
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}
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// Additionally, don't advance the pointer server-side
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// if the selected message is local-only
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if (event.msg_list === home_msg_list && page_params.narrow_stream === undefined) {
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if (event.id > pointer.furthest_read) {
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var msg = home_msg_list.get(event.id);
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if (!msg.locally_echoed) {
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pointer.furthest_read = event.id;
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}
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}
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}
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if (event.mark_read && event.previously_selected !== -1) {
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// Mark messages between old pointer and new pointer as read
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var messages;
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if (event.id < event.previously_selected) {
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messages = event.msg_list.message_range(event.id, event.previously_selected);
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} else {
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messages = event.msg_list.message_range(event.previously_selected, event.id);
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}
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unread_ops.notify_server_messages_read(messages, {from: 'pointer'});
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}
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});
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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 = pointer;
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}
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