/protected/extensions/yiinfinite-scroll/YiinfiniteScroller.php

<?php

/**
 * This extension uses the infinite scroll jQuery plugin, from
 * http://www.infinite-scroll.com/ to create an infinite scrolling pagination,
 * like in twitter.
 *
 * It uses javascript to load and parse the new pages, but gracefully degrade
 * in cases where javascript is disabled and the users will still be able to
 * access all the pages.
 *
 * @author davi_alexandre
 */
class YiinfiniteScroller extends CBasePager {

    public $contentSelector = '#content';

    private $_options = array(
        'loadingImg'    => null,
        'loadingText'   => null,
        'donetext'      => null,
        'itemSelector'  => null,
        'errorCallback' => null,
    );

    private $_default_options = array(
        'navSelector'   => 'div.infinite_navigation',
        'nextSelector'  => 'div.infinite_navigation a:first',
        'bufferPx'      => '300',
    );

    public function init() {
        $this->getPages()->validateCurrentPage = false;
        parent::init();
    }

    public function run() {
        $this->registerClientScript();
        $this->createInfiniteScrollScript();
        $this->renderNavigation();

        if($this->getPages()->getPageCount() > 0 && $this->theresNoMorePages()) {
            throw new CHttpException(404);
        }
    }

    public function __get($name) {
        if(array_key_exists($name, $this->_options)) {
            return $this->_options[$name];
        }

        return parent::__get($name);
    }

    public function __set($name, $value) {
        if(array_key_exists($name, $this->_options)) {
            return $this->_options[$name] = $value;
        }

        return parent::__set($name, $value);
    }

    public function registerClientScript() {
        $url = CHtml::asset(Yii::getPathOfAlias('ext.yiinfinite-scroll.assets').'/jquery.infinitescroll.min.js');
        $masonry = CHtml::asset(Yii::getPathOfAlias('ext.yiinfinite-scroll.assets').'/jquery.masonry.min.js');
        Yii::app()->clientScript->registerScriptFile($url);
        Yii::app()->clientScript->registerScriptFile($masonry);
    }

    private function createInfiniteScrollScript() {
        Yii::app()->clientScript->registerScript(
                uniqid(),
                " var container = $('#content');
        var item = '.post';
        container.imagesLoaded(function () {
            container.masonry({
                itemSelector:item
            });
        });

        container.infinitescroll({
                'loadingText':'Loading...',
                'donetext':'This is the end... my only friend, the end',
                'itemSelector':'.post',
                'navSelector':'div.infinite_navigation',
                'nextSelector':'div.infinite_navigation a:first',
                'bufferPx':'300'
            },
// trigger Masonry as a callback
            function (newElements) {
// hide new items while they are loading
                var newElems = $(newElements).css({ opacity:0 });
// ensure that images load before adding to masonry layout
                newElems.imagesLoaded(function () {
// show elems now they're ready
                    newElems.animate({ opacity:1 });
                    container.masonry('appended', newElems, true);
                });
            }
        );"
        );
    }

    private function buildInifiniteScrollOptions() {
        $options = array_merge($this->_options, $this->_default_options);
        $options = array_filter( $options );
        $options = CJavaScript::encode($options);
        return $options;
    }

    private function renderNavigation() {
        $next_link = CHtml::link('next',$this->createPageUrl($this->getCurrentPage(false)+1));
        echo '<div class="infinite_navigation">'.$next_link.'</div>';
    }

    private function theresNoMorePages() {
        return $this->getPages()->getCurrentPage() >= $this->getPages()->getPageCount();
    }

}

?>