{

$num_groups = 2;

$optimal_boards = round($total_boards / $num_groups);

$groups = array(0 => array());

$group_totals = array(0 => 0);

$current_streak = 0;

$current_group = 0;

foreach ($categories as $cat => $boards_count)

{

$groups[$current_group][] = $cat;

// The +1 here are to take in consideration category headers

// that visuallt account for about one additional board

$group_totals[$current_group] += $boards_count + 1;

$current_streak += $boards_count + 1;

// Start a new streak

if ($current_streak > $optimal_boards && $current_group < ($num_groups - 1))

{

$current_streak = 0;

$current_group++;

$groups[$current_group] = array();

$group_totals[$current_group] = 0;

}

}

// The current difference of elements from left and right

$diff_current = $group_totals[0] - $group_totals[1];

// If we have less on the right, let's try picking one from the left

if ($diff_current > 0)

{

$last_group = array_pop($groups[0]);

// Same as above, +1 for cat header

$diff_alternate = $diff_current - 2 * ($categories[$last_group] + 1);

if (abs($diff_alternate) < $diff_current)

array_unshift($groups[1], $last_group);

else

$groups[0][] = $last_group;

}

// If we have less on the left, let's try picking one from the right

elseif ($diff_current < 0)

{

$first_group = array_shift($groups[1]);

// Same as above, +1 for cat header

$diff_alternate = $diff_current + 2 * ($categories[$first_group] + 1);

if (abs($diff_alternate) < abs($diff_current))

$groups[0][] = $first_group;

else

array_unshift($groups[1], $first_group);

}

return $groups;

{

global $context, $settings, $txt, $scripturl, $theme_bi_alternating_row;

echo '

<ul class="category_boards" id="', $id, '">';

// Each board in each category's boards has:

// new (is it new?), id, name, description, moderators (see below), link_moderators (just a list.),

// children (see below.), link_children (easier to use.), children_new (are they new?),

// topics (# of), posts (# of), link, href, and last_post. (see below.)

foreach ($boards as $board)

{

echo '

<li class="board_row', (!empty($board['children'])) ? ' parent_board' : '', $board['is_redirect'] ? ' board_row_redirect' : '', $theme_bi_alternating_row ? ' alternating_row' : '', '" id="board_', $board['id'], '">

<div class="board_info">

<a class="icon_anchor" href="', ($board['is_redirect'] || $context['user']['is_guest'] ? $board['href'] : $scripturl . '?action=unread;board=' . $board['id'] . '.0;children'), '">';

// If the board or children is new, show an indicator.

if ($board['new'] || $board['children_new'])

echo '

<span class="board_icon ', $board['new'] ? 'on_board' : 'on2_board', '" title="', $txt['new_posts'], '"></span>';

// Is it a redirection board?

elseif ($board['is_redirect'])

echo '

<span class="board_icon redirect_board" title="', sprintf($txt['redirect_board_to'], Util::htmlspecialchars($board['name'])), '"></span>';

// No new posts at all! The agony!!

else

echo '

<span class="board_icon off_board" title="', $txt['old_posts'], '"></span>';

echo '

</a>

<h3 class="board_name">

<a href="', $board['href'], '" id="b', $board['id'], '">', $board['name'], '</a>';

// Has it outstanding posts for approval? @todo - Might change presentation here.

if ($board['can_approve_posts'] && ($board['unapproved_posts'] || $board['unapproved_topics']))

echo '

<a href="', $scripturl, '?action=moderate;area=postmod;sa=', ($board['unapproved_topics'] > 0 ? 'topics' : 'posts'), ';brd=', $board['id'], ';', $context['session_var'], '=', $context['session_id'], '" title="', sprintf($txt['unapproved_posts'], $board['unapproved_topics'], $board['unapproved_posts']), '" class="moderation_link"><img class="icon" src="', $settings['images_url'], '/icons/field_invalid.png" alt="(!)" /></a>';

echo '

</h3>

<p class="board_description">', $board['description'], '</p>';

// Show the "Moderators: ". Each has name, href, link, and id. (but we're gonna use link_moderators.)

if (!empty($board['moderators']))

echo '

<p class="moderators">', count($board['moderators']) === 1 ? $txt['moderator'] : $txt['moderators'], ': ', implode(', ', $board['link_moderators']), '</p>';

// Show some basic information about the number of posts, etc.

echo '

</div>

<div class="board_latest">

<p class="board_stats">

', comma_format($board['posts']), ' ', $board['is_redirect'] ? $txt['redirects'] : $txt['posts'], $board['is_redirect'] ? '' : '<br /> ' . comma_format($board['topics']) . ' ' . $txt['board_topics'], '

</p>';

// @todo - Last post message still needs some work. Probably split the language string into three chunks.

// Example:

// <chunk>Re: Nunc aliquam justo e...</chunk> <chunk>by Whoever</chunk> <chunk>Last post: Today at 08:00:37 am</chunk>

// That should still allow sufficient scope for any language, if done sensibly.

if (!empty($board['last_post']['id']))

{

echo '

<p class="board_lastpost">';

if (!empty($settings['avatars_on_indexes']))

echo '

<span class="board_avatar"><a href="', $board['last_post']['member']['href'], '"><img class="avatar" src="', $board['last_post']['member']['avatar']['href'], '" alt="" /></a></span>';

echo '

', $board['last_post']['last_post_message'], '

</p>';

}

echo '

</div>

</li>';

// Show the "Sub-boards: ". (there's a link_children but we're going to bold the new ones...)

if (!empty($board['children']))

{

// Sort the links into an array with new boards bold so it can be imploded.

$children = array();

// Each child in each board's children has:

// id, name, description, new (is it new?), topics (#), posts (#), href, link, and last_post.

foreach ($board['children'] as $child)

{

if (!$child['is_redirect'])

$child['link'] = '<a href="' . $child['href'] . '" ' . ($child['new'] ? 'class="board_new_posts" ' : '') . 'title="' . ($child['new'] ? $txt['new_posts'] : $txt['old_posts']) . ' (' . $txt['board_topics'] . ': ' . comma_format($child['topics']) . ', ' . $txt['posts'] . ': ' . comma_format($child['posts']) . ')">' . $child['name'] . ($child['new'] ? '</a> <a ' . ($child['new'] ? 'class="new_posts" ' : '') . 'href="' . $scripturl . '?action=unread;board=' . $child['id'] . '" title="' . $txt['new_posts'] . ' (' . $txt['board_topics'] . ': ' . comma_format($child['topics']) . ', ' . $txt['posts'] . ': ' . comma_format($child['posts']) . ')"><span class="new_posts">' . $txt['new'] . '</span>' : '') . '</a>';

else

$child['link'] = '<a href="' . $child['href'] . '" title="' . comma_format($child['posts']) . ' ' . $txt['redirects'] . '">' . $child['name'] . '</a>';

// Has it posts awaiting approval?

if ($child['can_approve_posts'] && ($child['unapproved_posts'] || $child['unapproved_topics']))

$child['link'] .= ' <a href="' . $scripturl . '?action=moderate;area=postmod;sa=' . ($child['unapproved_topics'] > 0 ? 'topics' : 'posts') . ';brd=' . $child['id'] . ';' . $context['session_var'] . '=' . $context['session_id'] . '" title="' . sprintf($txt['unapproved_posts'], $child['unapproved_topics'], $child['unapproved_posts']) . '" class="moderation_link"><img class="icon" src="' . $settings['images_url'] . '/icons/field_invalid.png" alt="(!)" /></a>';

$children[] = $child['link'];

}

// New <li> for sub-boards (if any). Can be styled to look like part of previous <li>.

// Use h4 tag here for better a11y. Use <ul> for list of sub-boards.

// Having sub-board links in <li>'s will allow "tidy sub-boards" via easy CSS tweaks. ;)

echo '

<li class="childboard_row', $theme_bi_alternating_row ? ' alternating_row' : '', '" id="board_', $board['id'], '_children">

<ul class="childboards">

<li>

<h4>', $txt['parent_boards'], ':</h4>

</li>

<li>

', implode('</li><li>', $children), '

</li>

</ul>

</li>';

}

$theme_bi_alternating_row = $theme_bi_alternating_row ? 0 : 1;

}

echo '

</ul>';

{

global $context, $txt;

if ($select_all)

echo '

<h3 class="secondary_header">

<span id="category_toggle">&nbsp;

<span id="advanced_panel_toggle" class="', $context['boards_check_all'] ? 'expand' : 'collapse', '" style="display: none;" title="', $txt['hide'], '"></span>

</span>

<a href="#" id="advanced_panel_link">', $txt['choose_board'], '</a>

</h3>

<div id="advanced_panel_div"', $context['boards_check_all'] ? ' style="display: none;"' : '', '>';

// Make two nice columns of boards, link each category header to toggle select all boards in each

$group_cats = optimizeBoardsSubdivision($context['boards_in_category'], $context['num_boards']);

foreach ($group_cats as $groups)

{

echo '

<ul class="ignoreboards floatleft">';

foreach ($groups as $cat_id)

{

$category = $context['categories'][$cat_id];

echo '

<li class="category">

<a href="javascript:void(0);" onclick="selectBoards([', implode(', ', $category['child_ids']), '], \'', $form_name, '\', \'', $input_names, '\'); return false;">', $category['name'], '</a>

<ul>';

foreach ($category['boards'] as $board)

{

echo '

<li class="board" style="margin-', $context['right_to_left'] ? 'right' : 'left', ': ', $board['child_level'], 'em;">

<label for="', $input_names, $board['id'], '">

<input type="checkbox" id="', $input_names, $board['id'], '" name="', $input_names, '[', $board['id'], ']" value="', $board['id'], '"', $board['selected'] ? ' checked="checked"' : '', ' class="input_check" /> ', $board['name'], '

</label>

</li>';

}

echo '

</ul>

</li>';

}

echo '

</ul>';

}

// Provide an easy way to select all boards

if ($select_all)

{

echo '

</div>

<div class="submitbutton">

<span class="floatleft">

<input type="checkbox" name="all" id="check_all" value=""', $context['boards_check_all'] ? ' checked="checked"' : '', ' onclick="invertAll(this, this.form, \'', $input_names, '\');" class="input_check" />

<label for="check_all">

<em> ', $txt['check_all'], '</em>

</label>

</span>

</div>';

// And now all the JS to make this work

addInlineJavascript('

// Some javascript for the advanced board select toggling

var oAdvancedPanelToggle = new elk_Toggle({

bToggleEnabled: true,

bCurrentlyCollapsed: ' . ($context['boards_check_all'] ? 'true' : 'false') . ',

aSwappableContainers: [

\'advanced_panel_div\'

],

aSwapClasses: [

{

sId: \'advanced_panel_toggle\',

classExpanded: \'collapse\',

titleExpanded: ' . JavaScriptEscape($txt['hide']) . ',

classCollapsed: \'expand\',

titleCollapsed: ' . JavaScriptEscape($txt['show']) . '

}

],

aSwapLinks: [

{

sId: \'advanced_panel_link\',

msgExpanded: ' . JavaScriptEscape($txt['choose_board']) . ',

msgCollapsed: ' . JavaScriptEscape($txt['choose_board']) . '

}

],

});', true);

}