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<?php

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namespace Nextend\SmartSlider3\Widget;

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use Nextend\Framework\View\Html;

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class WidgetPlacementAdvanced extends WidgetPlacement {

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protected $items = array();

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protected $variables = array();

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public function add($renderCallback, $horizontalSide, $horizontalPosition, $horizontalUnit, $verticalSide, $verticalPosition, $verticalUnit) {

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$attributes = array(

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'style' => ''

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);

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$transforms = array();

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if (is_numeric($horizontalPosition)) {

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$attributes['style'] .= $horizontalSide . ':' . $horizontalPosition . $horizontalUnit . ';';

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} else {

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$attributes['style'] .= $horizontalSide . ':0;';

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$transforms[] = 'translateX(' . $this->toCSSCalc($horizontalSide == 'left' ? 1 : -1, $horizontalPosition) . ')';

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}

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if (is_numeric($verticalPosition)) {

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$attributes['style'] .= $verticalSide . ':' . $verticalPosition . $verticalUnit . ';';

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} else {

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$attributes['style'] .= $verticalSide . ':0;';

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$transforms[] = 'translateY(' . $this->toCSSCalc($verticalSide == 'top' ? 1 : -1, $verticalPosition) . ')';

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}

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if (!empty($transforms)) {

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$attributes['style'] .= 'transform:' . implode(' ', $transforms) . ';';

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}

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$this->items[] = array(

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'renderCallback' => $renderCallback,

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'attributes' => $attributes

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);

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}

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public function render() {

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$out = '';

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foreach ($this->items as $item) {

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$out .= call_user_func($item['renderCallback'], $item['attributes']);

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}

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if (!empty($out)) {

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return Html::tag('div', array(

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'class' => 'n2-ss-slider-controls n2-ss-slider-controls-' . $this->name,

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'data-variables' => implode(',', array_unique($this->variables))

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), $out);

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}

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return '';

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}

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private function toCSSCalc($modifier, $expression) {

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// Remove whitespaces

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$expression = preg_replace('/\s+/', '', $expression);

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// take care of minus symbol on single number

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$expression = preg_replace('/([+\-*\/])[\-]/', '$1[minus]', $expression);

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$expression = preg_replace('/[+\-*\/]/', ' $0 ', $expression);

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$expression = str_replace('[minus]', '-1 * ', $expression);

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preg_match_all('/[a-zA-Z][a-zA-Z0-9]*/', $expression, $matches);

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foreach ($matches as $match) {

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if (!empty($match)) {

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$this->variables = array_merge($this->variables, $match);

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}

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}

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$expression = preg_replace('/[a-zA-Z][a-zA-Z0-9]*/', 'var(--$0, 0)', $expression);

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return 'calc(' . $modifier . 'px * (' . $expression . '))';

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}

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}

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