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iText, a free Java-PDF library
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/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2017 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: [email protected]
 */
package com.itextpdf.text.pdf.interfaces;

import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;

/**
 * Viewer preferences are described in section 3.6.1 and 8.1 of the
 * PDF Reference 1.7 (Table 3.25 on p139-142 and Table 8.1 on p579-581).
 * They are explained in section 13.1 of the book 'iText in Action'.
 * The values of the different  preferences were originally stored
 * in class PdfWriter, but they have been moved to this separate interface
 * for reasons of convenience.
 */

public interface PdfViewerPreferences {	
		
    /**
     * Sets the page layout and page mode preferences by ORing one or two of these constants.
     * 
     * 

     * The page layout to be used when the document is opened (choose one).
     *   
     *   PageLayoutSinglePage - Display one page at a time. (default)
     *   
PageLayoutOneColumn - Display the pages in one column.
     *   
PageLayoutTwoColumnLeft - Display the pages in two columns, with
     *       odd-numbered pages on the left.
     *   
PageLayoutTwoColumnRight - Display the pages in two columns, with
     *       odd-numbered pages on the right.
     *   
PageLayoutTwoPageLeft - Display the pages two at a time, with
     *       odd-numbered pages on the left.
     *   
PageLayoutTwoPageRight - Display the pages two at a time, with
     *       odd-numbered pages on the right.
     *   
     * 
The page mode how the document should be displayed
     *     when opened (choose one).
     *   
     *   PageModeUseNone - Neither document outline nor thumbnail images visible. (default)
     *   
PageModeUseOutlines - Document outline visible.
     *   
PageModeUseThumbs - Thumbnail images visible.
     *   
PageModeFullScreen - Full-screen mode, with no menu bar, window
     *       controls, or any other window visible.
     *   
PageModeUseOC - Optional content group panel visible
     *   
PageModeUseAttachments - Attachments panel visible
     *   
     * 
     * For backward compatibility these values are also supported,
     * but it's better to use method addViewerPreference(key, value)
     * if you want to change the following preferences:
     * 
     * HideToolbar - A flag specifying whether to hide the viewer application's tool
     *     bars when the document is active.
     * 
HideMenubar - A flag specifying whether to hide the viewer application's
     *     menu bar when the document is active.
     * 
HideWindowUI - A flag specifying whether to hide user interface elements in
     *     the document's window (such as scroll bars and navigation controls),
     *     leaving only the document's contents displayed.
     * 
FitWindow - A flag specifying whether to resize the document's window to
     *     fit the size of the first displayed page.
     * 
CenterWindow - A flag specifying whether to position the document's window
     *     in the center of the screen.
     * 
DisplayDocTitle - A flag specifying whether to display the document's title
     *     in the top bar.
     * 
The predominant reading order for text. This entry has no direct effect on the
     *     document's contents or page numbering, but can be used to determine the relative
     *     positioning of pages when displayed side by side or printed n-up (choose one).
     *   
     *   DirectionL2R - Left to right
     *   
DirectionR2L - Right to left (including vertical writing systems such as
     *       Chinese, Japanese, and Korean)
     *   
     * 
The document's page mode, specifying how to display the
     *     document on exiting full-screen mode. It is meaningful only
     *     if the page mode is PageModeFullScreen (choose one).
     *   
     *   NonFullScreenPageModeUseNone - Neither document outline nor thumbnail images
     *       visible
     *   
NonFullScreenPageModeUseOutlines - Document outline visible
     *   
NNonFullScreenPageModeUseThumbs - Thumbnail images visible
     *   
NonFullScreenPageModeUseOC - Optional content group panel visible
     *   
     * 
PrintScalingNone - Indicates that the print dialog should reflect no page scaling.
     * 
     * @param preferences the viewer preferences
	 * @see PdfViewerPreferences#addViewerPreference
     */
    public void setViewerPreferences(int preferences);
    
    /**
     * Adds a viewer preference.
     * 
     * In case the key is one of these values:
     * 		
     * 			PdfName.HIDETOOLBAR
     * 			
PdfName.HIDEMENUBAR
     * 			
PdfName.HIDEWINDOWUI
     * 			
PdfName.FITWINDOW
     * 			
PdfName.CENTERWINDOW
     * 			
PdfName.DISPLAYDOCTITLE
     * 		
     * The value must be a of type PdfBoolean (true or false).
     * 
In case the key is PdfName.NONFULLSCREENPAGEMODE,
     * the value must be one of these names:
     * 		
     * 			PdfName.USENONE
     * 			
PdfName.USEOUTLINES
     * 			
PdfName.USETHUMBS
     * 			
PdfName.USEOC
     * 		
     * 
In case the key is PdfName.DIRECTION,
     * the value must be one of these names:
     * 		
     * 			PdfName.L2R
     * 			
PdfName.R2L
     * 		
     * 
In case the key is one of these values:
     * 		
     * 			PdfName.VIEWAREA
     * 			
PdfName.VIEWCLIP
     * 			
PdfName.PRINTAREA
     * 			
PdfName.PRINTCLIP
     * 		
     * 	The value must be one of these names:
     * 		
     * 			PdfName.MEDIABOX
     * 			
PdfName.CROPBOX
     * 			
PdfName.BLEEDBOX
     * 			
PdfName.TRIMBOX
     * 			
PdfName.ARTBOX
     * 		
     * 
In case the key is PdfName.PRINTSCALING, the value can be
     * 		
     * 			PdfName.APPDEFAULT
     * 			
PdfName.NONE
     * 		
     * 
In case the key is PdfName.DUPLEX, the value can be:
     * 		
     * 			PdfName.SIMPLEX
     * 			
PdfName.DUPLEXFLIPSHORTEDGE
     * 			
PdfName.DUPLEXFLIPLONGEDGE
     * 		
     * 
In case the key is PdfName.PICKTRAYBYPDFSIZE, the value must be of type PdfBoolean.
     * 
In case the key is PdfName.PRINTPAGERANGE, the value must be of type PdfArray.
     * In case the key is PdfName.NUMCOPIES, the value must be of type PdfNumber.
     * 
     * 
     * @param key	the name of the viewer preference
     * @param value	the value of the viewer preference
	 * @see PdfViewerPreferences#setViewerPreferences
     */
    public void addViewerPreference(PdfName key, PdfObject value);    	
}