yii\debug\components\TimelineDataProvider::prepareModels PHP Method

    protected function prepareModels()
    {
        if (($models = $this->allModels) === null) {
            return [];
        }
        $child = [];
        foreach ($models as $key => &$model) {
            $model['timestamp'] *= 1000;
            $model['duration'] *= 1000;
            $model['child'] = 0;
            $model['css']['width'] = $this->getWidth($model);
            $model['css']['left'] = $this->getLeft($model);
            $model['css']['color'] = $this->getColor($model);
            foreach ($child as $id => $timestamp) {
                if ($timestamp > $model['timestamp']) {
                    ++$models[$id]['child'];
                } else {
                    unset($child[$id]);
                }
            }
            $child[$key] = $model['timestamp'] + $model['duration'];
        }
        return $models;
    }