151 lines
3.6 KiB
PHP
151 lines
3.6 KiB
PHP
<?php
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class TagCloudWidget extends Widget {
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static $db = array(
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"Title" => "Varchar",
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"Limit" => "Int",
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"Sortby" => "Varchar"
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);
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static $has_one = array();
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static $has_many = array();
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static $many_many = array();
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static $belongs_many_many = array();
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static $defaults = array(
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"Title" => "Tag Cloud",
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"Limit" => "0",
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"Sortby" => "alphabet"
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);
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static $cmsTitle = "Tag Cloud";
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static $description = "Shows a tag cloud of tags on your blog.";
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static $popularities = array( 'not-popular', 'not-very-popular', 'somewhat-popular', 'popular', 'very-popular', 'ultra-popular' );
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function getCMSFields() {
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$fields = parent::getCMSFields();
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$fields->merge(
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new FieldList(
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new TextField("Title", _t("TagCloudWidget.TILE", "Title")),
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new TextField("Limit", _t("TagCloudWidget.LIMIT", "Limit number of tags")),
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new OptionsetField("Sortby",_t("TagCloudWidget.SORTBY","Sort by"),array("alphabet"=>_t("TagCloudWidget.SBAL", "alphabet"),"frequency"=>_t("TagCloudWidget.SBFREQ", "frequency")))
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)
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);
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$this->extend('updateCMSFields', $fields);
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return $fields;
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}
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function Title() {
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return $this->Title ? $this->Title : 'Tag Cloud';
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}
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function TagsCollection() {
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Requirements::themedCSS("tagcloud");
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$allTags = array();
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$max = 0;
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$container = BlogTree::current();
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$entries = $container->Entries();
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if($entries) {
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foreach($entries as $entry) {
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$theseTags = preg_split(" *, *", mb_strtolower(trim($entry->Tags)));
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foreach($theseTags as $tag) {
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if($tag != "") {
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$allTags[$tag] = isset($allTags[$tag]) ? $allTags[$tag] + 1 : 1; //getting the count into key => value map
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$max = ($allTags[$tag] > $max) ? $allTags[$tag] : $max;
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}
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}
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}
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if($allTags) {
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//TODO: move some or all of the sorts to the database for more efficiency
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if($this->Limit > 0) $allTags = array_slice($allTags, 0, $this->Limit, true);
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if($this->Sortby == "alphabet"){
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$this->natksort($allTags);
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} else{
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uasort($allTags, array($this, "column_sort_by_popularity")); // sort by frequency
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}
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$sizes = array();
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foreach ($allTags as $tag => $count) $sizes[$count] = true;
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$offset = 0;
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$numsizes = count($sizes)-1; //Work out the number of different sizes
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$buckets = count(self::$popularities)-1;
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// If there are more frequencies than buckets, divide frequencies into buckets
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if ($numsizes > $buckets) {
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$numsizes = $buckets;
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}
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// Otherwise center use central buckets
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else {
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$offset = round(($buckets-$numsizes)/2);
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}
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foreach($allTags as $tag => $count) {
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$popularity = round($count / $max * $numsizes) + $offset; $popularity=min($buckets,$popularity);
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$class = self::$popularities[$popularity];
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$allTags[$tag] = array(
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"Tag" => $tag,
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"Count" => $count,
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"Class" => $class,
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"Link" => $container->Link('tag') . '/' . urlencode($tag)
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);
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}
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}
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$output = new ArrayList();
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foreach($allTags as $tag => $fields) {
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$output->push(new ArrayData($fields));
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}
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return $output;
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}
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return;
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}
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/**
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* Helper method to compare 2 Vars to work out the results.
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* @param mixed
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* @param mixed
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* @return int
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*/
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private function column_sort_by_popularity($a, $b){
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if($a == $b) {
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$result = 0;
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}
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else {
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$result = $b - $a;
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}
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return $result;
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}
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private function natksort(&$aToBeSorted) {
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$aResult = array();
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$aKeys = array_keys($aToBeSorted);
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natcasesort($aKeys);
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foreach ($aKeys as $sKey) {
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$aResult[$sKey] = $aToBeSorted[$sKey];
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}
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$aToBeSorted = $aResult;
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return true;
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}
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}
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?>
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