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Reduce code duplication in keep_pointer_in_view

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Fixes #269.

(imported from commit 5d382c0e1493a0798fc9bd1f5a8f37e15f2ea5ef)
This commit is contained in:
Keegan McAllister
2012-11-24 02:03:17 -05:00
parent b21bdc91cb
commit a70fb98038
1 changed files with 12 additions and 16 deletions
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26
zephyr/static/js/zephyr.js
View File

@@ -756,25 +756,21 @@ function keep_pointer_in_view() {
if (next_message.length === 0)
return;
if (above_view_threshold(next_message) && (!at_top_of_viewport())) {
while (above_view_threshold(next_message)) {
candidate = rows.next_visible(next_message);
if (candidate.length === 0) {
function adjust(past_threshold, at_end, advance) {
if (!past_threshold(next_message) || at_end())
return false; // try other side
while (past_threshold(next_message)) {
candidate = advance(next_message);
if (candidate.length === 0)
break;
} else {
next_message = candidate;
}
return true;
}
} else if (below_view_threshold(next_message) && (!at_bottom_of_viewport())) {
while (below_view_threshold(next_message)) {
candidate = rows.prev_visible(next_message);
if (candidate.length === 0) {
break;
} else {
next_message = candidate;
}
}
}
if (! adjust(above_view_threshold, at_top_of_viewport, rows.next_visible))
adjust(below_view_threshold, at_bottom_of_viewport, rows.prev_visible);
update_selected_message(next_message, {update_server: true});
}