mirror of https://github.com/zulip/zulip.git
100 lines
3.2 KiB
JavaScript
100 lines
3.2 KiB
JavaScript
var compose_fade = (function () {
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var exports = {};
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var focused_recipient;
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var any_messages_faded = false;
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exports.set_focused_recipient = function (msg_type) {
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// Construct focused_recipient as a mocked up element which has all the
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// fields of a message used by util.same_recipient()
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focused_recipient = {
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type: msg_type
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};
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if (focused_recipient.type === "stream") {
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focused_recipient.stream = $('#stream').val();
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focused_recipient.subject = $('#subject').val();
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} else {
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// Normalize the recipient list so it matches the one used when
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// adding the message (see add_message_metadata(), zulip.js).
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focused_recipient.reply_to = util.normalize_recipients(
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$('#private_message_recipient').val());
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}
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};
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exports.unfade_messages = function (clear_state) {
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if (focused_recipient === undefined) {
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return;
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}
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if (!any_messages_faded) {
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return;
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}
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rows.get_table(current_msg_list.table_name).find(".recipient_row, .message_row")
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.removeClass("faded").addClass("unfaded");
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any_messages_faded = false;
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if (clear_state === true) {
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focused_recipient = undefined;
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}
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ui.update_floating_recipient_bar();
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};
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function _update_faded_messages() {
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// See also update_faded_messages(), which just wraps this with a debounce.
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if (focused_recipient === undefined) {
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return;
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}
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if ((focused_recipient.type === "stream" && focused_recipient.subject === "") ||
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(focused_recipient.type === "private" && focused_recipient.reply_to === "")) {
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exports.unfade_messages();
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return;
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}
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var i;
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var all_elts = rows.get_table(current_msg_list.table_name).find(".recipient_row, .message_row");
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var should_fade_message = false;
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// Note: The below algorithm relies on the fact that all_elts is
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// sorted as it would be displayed in the message view
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for (i = 0; i < all_elts.length; i++) {
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var elt = $(all_elts[i]);
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if (elt.hasClass("recipient_row")) {
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should_fade_message = !util.same_recipient(focused_recipient, current_msg_list.get(rows.id(elt)));
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}
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// Usually we are not actually switching up the classes here, so the hasClass()
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// calls here will usually short circuit two function calls that are more expensive.
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// So, while the hasClass() checks are semantically unnecessary, they should improve
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// performance. See trac #1633 for more context.
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if (should_fade_message) {
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if (!elt.hasClass("faded")) {
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elt.removeClass("unfaded").addClass("faded");
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}
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any_messages_faded = true;
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} else {
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if (!elt.hasClass("unfaded")) {
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elt.removeClass("faded").addClass("unfaded");
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}
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}
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}
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ui.update_floating_recipient_bar();
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}
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// See trac #1633. For fast typists, calls to _update_faded_messages can
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// cause typing sluggishness.
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exports.update_faded_messages = _.debounce(_update_faded_messages, 150);
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exports.set_faded_messages = function (msg_type) {
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exports.set_focused_recipient(msg_type);
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_update_faded_messages();
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};
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return exports;
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}());
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