mirror of https://github.com/zulip/zulip.git
109 lines
4.1 KiB
JavaScript
109 lines
4.1 KiB
JavaScript
var notifications_bar = (function () {
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var exports = {};
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var disabled = false; // true when the bar should be hidden (eg, it's blocking the composebox)
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var displayed = false; // true when the bar is supposedly displayed (ignoring disabled-ness)
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var on_custom = false; // true when the bar is showing a custom message
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var custom_message = ""; // the current custom message being displayed, if any
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var current_message = ""; // the current notification being displayed in the bar, if any
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var timeoutID = null; // keeping track of the clear_custom_message timer, so we can cancel it
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var bar_selector = "#notifications-bar"; // the selector jQuery can use to pick the notifications bar
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var area_selector = "#notifications-area"; // the selector jQuery can use to pick the container
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// Try to show msg (but this might fail if the bar is disabled)
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function show(msg) {
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if (disabled)
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return; // we should never show the bar when disabled
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if (displayed && msg !== current_message) {
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// If the bar is already displayed and we're changing the text, show an animation
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var changeText = function () {
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// Custom effect to put change of text in the queue (after slideUp)
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$(this).text(msg);
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$(this).dequeue();
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};
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$(bar_selector).slideUp(50).queue(changeText).delay(100).slideDown(50);
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} else if (!displayed) {
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// If the bar wasn't already displayed, simply show it
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$(bar_selector).text(msg).slideDown(50);
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displayed = true; // we need to set this flag
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}
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// In the last case (the bar is already displayed and has the right text), do nothing
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// We can't use $(bar_selector).text() to get the current notification
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// because, in one of the cases above, the text isn't actually changed
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// immediately. Instead, let's store the current notification in a global
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// variable.
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current_message = msg;
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}
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// Hide the notifications bar
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function hide() {
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if (!displayed)
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return; // don't unnecessarily add to the element's fx queue
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displayed = false;
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current_message = "";
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$(bar_selector).slideUp(50);
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}
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// If there's a custom message, or if the last message is off the bottom of the
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// screen, then show the notifications bar.
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exports.update = function () {
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var unread_messages_below = 0;
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if (!narrow.active()) {
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unread_messages_below = home_unread_messages;
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} else {
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$.each(current_msg_list.all(), function (idx, msg) {
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if (message_unread(msg) && msg.id > current_msg_list.selected_id()) {
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unread_messages_below += 1;
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}
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});
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}
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if (on_custom)
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show(custom_message);
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else if (rows.last_visible().offset() !== null // otherwise the next line will error
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&& rows.last_visible().offset().top + rows.last_visible().height() > viewport.scrollTop() + viewport.height()
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&& unread_messages_below > 0)
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show("More messages below");
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else
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hide();
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};
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// Clear the custom message and go back to the default (called by a timer)
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function clear_custom_message() {
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on_custom = false;
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custom_message = "";
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timeoutID = null;
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exports.update();
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}
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// Show the message msg for duration milliseconds. If the notifications bar is
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// hidden by the composebox, the timer still ticks. Also, if this method is
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// called again, the new message will overwrite the old one.
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exports.show_custom_message = function (msg, duration) {
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if (timeoutID !== null)
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window.clearTimeout(timeoutID); // clear any existing timers
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on_custom = true;
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custom_message = msg;
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show(msg);
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timeoutID = window.setTimeout(clear_custom_message, duration);
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};
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// We disable the notifications bar if it overlaps with the composebox
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exports.maybe_disable = function() {
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if ($("#compose").offset().left + $("#compose").width() > $(area_selector).offset().left) {
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disabled = true;
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hide();
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}
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};
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// Un-disable the notifications bar, then call the update function to see if it should be displayed
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exports.enable = function() {
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disabled = false;
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exports.update();
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};
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return exports;
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}());
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