DropdownButton.php

<?php

/**
 * @link    http://foundationize.com
 * @package shqear/yii2-foundation6
 * @version 1.0.0
 */

namespace shqear\foundation6;

use yii\helpers\Html;
use yii\helpers\ArrayHelper;

/**
 * Description of ButtonDropdown
 */
class DropdownButton extends Widget
{
    /**
     * @var string the button label
     */
    public $label = 'Button';

    /**
     * @var array the HTML attributes of the button.
     * @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
     */
    public $options = ['class' => 'button'];

    /**
     * The button url, used only for split button
     * @var string Button url
     */
    public $url = '#';
    /**
     * @var array the configuration array for [[Dropdown]].
     */
    public $dropdown = [];

    /**
     * @var boolean whether to display a group of split-styled button group.
     */
    public $split = false;

    /**
     * @var string the tag to use to render the button
     */
    public $tagName = 'button';

    /**
     * @var boolean whether the label should be HTML-encoded.
     */
    public $encodeLabel = true;

    /**
     * Renders the widget.
     */
    public function run()
    {
        $dropdown = Dropdown::begin($this->getDropdownConfig());
        echo "\n" . $this->renderButton($dropdown);
        Dropdown::end();

        $this->registerPlugin('button');
    }

    /**
     * Generates the button dropdown.
     * @return string the rendering result.
     */
    protected function renderButton($dropdown)
    {
        $dropdownId = $dropdown->getId();

        $label = $this->label;
        if ($this->encodeLabel) {
            $label = Html::encode($label);
        }
        if ($this->split) {
            $this->tagName = 'a';
            Html::addCssClass($this->options, 'button');
            Html::addCssClass($this->options, 'split');
            $options = $this->options;
            $label .= Html::tag('span', '', ['data-dropdown' => $dropdownId]);
        } else {
            Html::addCssClass($this->options, 'dropdown');
            $options = $this->options;

            $options['data-dropdown'] = $dropdownId;
        }

        return Button::widget([
            'tagName' => $this->tagName,
            'label' => $label,
            'options' => $options,
            'url' => $this->url,
            'encodeLabel' => false,
        ]) . "<br />\n";
    }

    /**
     * Get config for [[Dropdown]] widget
     * @return array config options
     */
    protected function getDropdownConfig()
    {
        $config = $this->dropdown;
        $config['id'] = ArrayHelper::getValue($config, 'id', null);
        $config['clientOptions'] = false;
        $config['view'] = $this->getView();

        return $config;
    }

}