silverstripe-blog/code/TagCloudWidget.php
2007-12-18 02:10:44 +00:00

151 lines
3.3 KiB
PHP

<?php
class TagCloudWidget extends Widget {
static $db = array(
"Limit" => "Int",
"Sortby" => "Varchar"
);
static $defaults = array(
"Limit" => "0",
"Sortby" => "alphabet"
);
static $title = "Browse by Tag";
static $cmsTitle = "Tag Cloud";
static $description = "Shows a tag cloud of tags on your blog.";
function getBlogHolder() {
$page = Director::currentPage();
if($page->is_a("BlogHolder")) {
return $page;
} else if($page->is_a("BlogEntry") && $page->getParent()->is_a("BlogHolder")) {
return $page->getParent();
} else {
return DataObject::get_one("BlogHolder");
}
}
function getCMSFields() {
return new FieldSet(
new TextField("Limit", _t("TagCloudWidget.LIMIT", "Limit number of tags")),
new OptionsetField("Sortby",_t("TagCloudWidget.SORTBY","Sort by"),array("alphabet"=>_t("TagCloudWidget.SBAL", "alphabet"),"frequency"=>_t("TagCloudWidget.SBFREQ", "frequency")))
);
}
function Tags() {
Requirements::css("blog/css/tagcloud.css");
$allTags = array();
$max = 0;
$blogHolder = $this->getBlogHolder();
$entries = $blogHolder->Children();
if($entries) {
foreach($entries as $entry) {
$theseTags = split(" *, *", trim($entry->Tags));
foreach($theseTags as $tag) {
$allTags[$tag] = isset($allTags[$tag]) ? $allTags[$tag] + 1 : 1; //getting the count into key => value map
$max = ($allTags[$tag] > $max) ? $allTags[$tag] : $max;
}
}
if($allTags) {
//TODO: move some or all of the sorts to the database for more efficiency
if($this->Limit > 0){
uasort($allTags, "column_sort_by_popularity"); //sort by popularity
$allTags = array_slice($allTags, 0, $this->Limit);
}
if($this->Sortby == "alphabet"){
natksort($allTags);
}
$sizes = array();
foreach($allTags as $tag => $count){
$sizes[$count] = true;
}
$numsizes = count($sizes)-1; //Work out the number of different sizes
if($numsizes > 5){$numsizes = 5;}
foreach($allTags as $tag => $count) {
$popularity = floor($count / $max * $numsizes);
switch($popularity) {
case 0:
$class = "not-popular";
break;
case 1:
$class = "not-very-popular";
break;
case 2:
$class = "somewhat-popular";
break;
case 3:
$class = "popular";
break;
case 4:
$class = "very-popular";
break;
case 5:
$class = "ultra-popular";
break;
default:
$class = "broken";
break;
}
$allTags[$tag] = array(
"Tag" => $tag,
"Count" => $count,
"Class" => $class,
"Link" => $blogHolder->Link() . 'tag/' . urlencode($tag)
);
}
}
$output = new DataObjectSet();
foreach($allTags as $tag => $fields) {
$output->push(new ArrayData($fields));
}
return $output;
}
return;
}
}
function column_sort_by_popularity($a, $b){
if($a == $b) {
$result = 0;
}
else {
$result = $b - $a;
}
return $result;
}
function natksort(&$aToBeSorted)
{
$aResult = array();
$aKeys = array_keys($aToBeSorted);
natcasesort($aKeys);
foreach ($aKeys as $sKey)
{
$aResult[$sKey] = $aToBeSorted[$sKey];
}
$aToBeSorted = $aResult;
return true;
}
?>