SheetView.php

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<?php
class PHPExcel_Worksheet_SheetView
{
        private $_zoomScale;

        private $_zoomScaleNormal;

    public function __construct()
    {
        // Initialise values
        $this->_zoomScale                               = 100;
        $this->_zoomScaleNormal                 = 100;
    }

        public function getZoomScale() {
                return $this->_zoomScale;
        }

        public function setZoomScale($pValue = 100) {
                if (($pValue >= 10 && $pValue <= 400) || is_null($pValue)) {
                        $this->_zoomScale = $pValue;
                } else {
                        throw new Exception("Valid scale is between 10 and 400.");
                }
                return $this;
        }
        
        public function getZoomScaleNormal() {
                return $this->_zoomScaleNormal;
        }

        public function setZoomScaleNormal($pValue = 100) {
                if (($pValue >= 10 && $pValue <= 400) || is_null($pValue)) {
                        $this->_zoomScaleNormal = $pValue;
                } else {
                        throw new Exception("Valid scale is between 10 and 400.");
                }
                return $this;
        }

        public function __clone() {
                $vars = get_object_vars($this);
                foreach ($vars as $key => $value) {
                        if (is_object($value)) {
                                $this->$key = clone $value;
                        } else {
                                $this->$key = $value;
                        }
                }
        }
}