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<?php

/**
 * @package   yii2-krajee-base
 * @author    Kartik Visweswaran <kartikv2@gmail.com>
 * @copyright Copyright &copy; Kartik Visweswaran, Krajee.com, 2014 - 2016
 * @version   1.8.5
 */

namespace kartik\base;

use yii\helpers\Json;
use yii\web\JsExpression;
use yii\web\View;

/**
 * Trait used for Krajee widgets.
 *
 * @property bool   $enablePopStateFix
 * @property string $pluginName
 * @property string $pluginDestroyJs
 * @property array  $options
 * @property array  $pluginOptions
 * @property array  $_encOptions
 * @property string $_hashVar
 * @property string $_dataVar
 *
 * @method View getView()
 *
 * @author Kartik Visweswaran <kartikv2@gmail.com>
 * @since 1.6.0
 */
trait WidgetTrait
{
    /**
     * Sets HTML5 data variable
     *
     * @param string $name the plugin name
     *
     * @return void
     */
    protected function setDataVar($name)
    {
        /** @noinspection PhpUndefinedFieldInspection */
        $this->_dataVar = "data-krajee-{$name}";
    }


    /**
     * Generates the `pluginDestroyJs` if not set
     */
    protected function initDestroyJs()
    {
        if (isset($this->pluginDestroyJs)) {
            return;
        }
        if (empty($this->pluginName)) {
            $this->pluginDestroyJs = '';
            return;
        }
        $id = "jQuery('#" . $this->options['id'] . "')";
        $plugin = $this->pluginName;
        $this->pluginDestroyJs = "if ({$id}.data('{$this->pluginName}')) { {$id}.{$plugin}('destroy'); }";
    }

    /**
     * Adds an asset to the view
     *
     * @param View   $view The View object
     * @param string $file The asset file name
     * @param string $type The asset file type (css or js)
     * @param string $class The class name of the AssetBundle
     *
     * @return void
     */
    protected function addAsset($view, $file, $type, $class)
    {
        if ($type == 'css' || $type == 'js') {
            $asset = $view->getAssetManager();
            $bundle = $asset->bundles[$class];
            if ($type == 'css') {
                $bundle->css[] = $file;
            } else {
                $bundle->js[] = $file;
            }
            $asset->bundles[$class] = $bundle;
            $view->setAssetManager($asset);
        }
    }

    /**
     * Generates a hashed variable to store the pluginOptions. The following special data attributes
     * will also be setup for the input widget, that can be accessed through javascript :
     * - 'data-krajee-{name}' will store the hashed variable storing the plugin options. The {name}
     *   tag will represent the plugin name (e.g. select2, typeahead etc.) - Fixes issue #6.
     *
     * @param string $name the name of the plugin
     */
    protected function hashPluginOptions($name)
    {
        $this->_encOptions = empty($this->pluginOptions) ? '' : Json::htmlEncode($this->pluginOptions);
        $this->_hashVar = $name . '_' . hash('crc32', $this->_encOptions);
        $this->options['data-krajee-' . $name] = $this->_hashVar;
    }

    /**
     * Registers plugin options by storing it in a hashed javascript variable
     *
     * @param string $name the plugin name
     *
     * @return void
     */
    protected function registerPluginOptions($name)
    {
        $this->hashPluginOptions($name);
        $encOptions = empty($this->_encOptions) ? '{}' : $this->_encOptions;
        $this->registerWidgetJs("var {$this->_hashVar} = {$encOptions};\n", View::POS_HEAD);
    }

    /**
     * Returns the plugin registration script
     *
     * @param string $name the name of the plugin
     * @param string $element the plugin target element
     * @param string $callback the javascript callback function to be called after plugin loads
     * @param string $callbackCon the javascript callback function to be passed to the plugin constructor
     *
     * @return string the generated plugin script
     */
    protected function getPluginScript($name, $element = null, $callback = null, $callbackCon = null)
    {
        if ($element) {
            $id = $element;
            $sel = "{$id}.kvSelector()";
        } else {
            $sel = "'#" . $this->options['id'] . "'";
            $id = "jQuery({$sel})";
        }
        $script = '';
        if ($this->pluginOptions !== false) {
            $this->registerPluginOptions($name);
            $script = "{$id}.{$name}({$this->_hashVar})";
            if ($callbackCon != null) {
                $script = "{$id}.{$name}({$this->_hashVar}, {$callbackCon})";
            }
            if ($callback != null) {
                $script = "jQuery.when({$script}).done({$callback})";
            }
            $script .= ";\n";
        }
        $script = "kvInitPlugin({$sel}, function(){\n  {$this->pluginDestroyJs}\n  {$script}\n});\n";
        if (!empty($this->pluginEvents)) {
            foreach ($this->pluginEvents as $event => $handler) {
                $function = new JsExpression($handler);
                $script .= "kvListenEvent('{$event}', {$sel}, {$function});\n";
            }
        }
        return $script;
    }

    /**
     * Registers a specific plugin and the related events
     *
     * @param string $name the name of the plugin
     * @param string $element the plugin target element
     * @param string $callback the javascript callback function to be called after plugin loads
     * @param string $callbackCon the javascript callback function to be passed to the plugin constructor
     */
    protected function registerPlugin($name, $element = null, $callback = null, $callbackCon = null)
    {
        $script = $this->getPluginScript($name, $element, $callback, $callbackCon);
        $this->registerWidgetJs($script);
    }

    /**
     * Registers a JS code block for the widget.
     *
     * @param string  $js the JS code block to be registered
     * @param integer $pos the position at which the JS script tag should be inserted in a page. The possible values
     *     are:
     *      - [[POS_HEAD]]: in the head section
     *      - [[POS_BEGIN]]: at the beginning of the body section
     *      - [[POS_END]]: at the end of the body section
     *      - [[POS_LOAD]]: enclosed within jQuery(window).load(). Note that by using this position, the method will
     *     automatically register the jQuery js file.
     *      - [[POS_READY]]: enclosed within jQuery(document).ready(). This is the default value. Note that by using
     *     this position, the method will automatically register the jQuery js file.
     * @param string  $key the key that identifies the JS code block. If null, it will use $js as the key. If two JS
     *     code blocks are registered with the same key, the latter will overwrite the former.
     */
    public function registerWidgetJs($js, $pos = View::POS_READY, $key = null)
    {
        if (empty($js)) {
            return;
        }
        $view = $this->getView();
        WidgetAsset::register($view);
        $view->registerJs($js, $pos, $key);
        if (!empty($this->pjaxContainerId) && ($pos === View::POS_LOAD || $pos === View::POS_READY)) {
            $pjax = 'jQuery("#' . $this->pjaxContainerId . '")';
            $evComplete = 'pjax:complete.' . hash('crc32', $js);
            $view->registerJs("{$pjax}.off('{$evComplete}').on('{$evComplete}',function(){ {$js} });");
            // hack fix for browser back and forward buttons
            if ($this->enablePopStateFix) {
                $view->registerJs("window.addEventListener('popstate',function(){window.location.reload();});");
            }
        }
    }
}
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