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Prepend messages to all_msg_list when loading old messages 

(imported from commit cbe862b2ac133a365d0da28f3b761868e01eb48f)
This commit is contained in:
Leo Franchi 2013-02-27 16:51:37 -05:00
parent e3e5a0656d
commit 87d294de49
1 changed files with 25 additions and 10 deletions
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35
zephyr/static/js/zephyr.js
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@ -531,16 +531,31 @@ function add_message_metadata(message, dummy) {
}
function add_messages_helper(messages, msg_list, predicate, allow_collapse, append_to_table) {
var center_message_id = msg_list.selected_id();
// center_message_id is guaranteed to be between the top and bottom
var top_messages = $.grep(messages, function (elem, idx) {
return (elem.id < center_message_id && msg_list.get(elem.id) === undefined
&& predicate(elem));
});
var bottom_messages = $.grep(messages, function (elem, idx) {
return (elem.id >= center_message_id && msg_list.get(elem.id) === undefined
&& predicate(elem));
});
var top_messages = [];
var bottom_messages = [];
// If we're initially populating the list, save the messages in
// bottom_messages regardless
if (msg_list.selected_id() === -1 && msg_list.empty()) {
bottom_messages = $.grep(messages, predicate);
} else {
$.each(messages, function (idx, msg) {
// Filter out duplicates that are already in msg_list, and all messages
// that fail our filter predicate
if (! (msg_list.get(msg.id) === undefined && predicate(msg))) {
return;
}
// Put messages in correct order on either side of the message list
if (msg_list.empty() || (msg.id < msg_list.first().id)) {
top_messages.push(msg);
} else if (msg.id > msg_list.last().id) {
bottom_messages.push(msg);
} else {
throw new Error("Attempting to insert a message in the middle of the msg_list");
}
});
}
msg_list.prepend(top_messages);
msg_list.append(bottom_messages);