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iText, a free Java-PDF library
/*
* Copyright 2004 by Paulo Soares.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf;
import java.util.ArrayList;
import com.lowagie.text.error_messages.MessageLocalization;
/**
* An optional content group is a dictionary representing a collection of graphics
* that can be made visible or invisible dynamically by users of viewer applications.
* In iText they are referenced as layers.
*
* @author Paulo Soares ([email protected])
*/
public class PdfLayer extends PdfDictionary implements PdfOCG {
protected PdfIndirectReference ref;
protected ArrayList children;
protected PdfLayer parent;
protected String title;
/**
* Holds value of property on.
*/
private boolean on = true;
/**
* Holds value of property onPanel.
*/
private boolean onPanel = true;
PdfLayer(String title) {
this.title = title;
}
/**
* Creates a title layer. A title layer is not really a layer but a collection of layers
* under the same title heading.
* @param title the title text
* @param writer the PdfWriter
* @return the title layer
*/
public static PdfLayer createTitle(String title, PdfWriter writer) {
if (title == null)
throw new NullPointerException(MessageLocalization.getComposedMessage("title.cannot.be.null"));
PdfLayer layer = new PdfLayer(title);
writer.registerLayer(layer);
return layer;
}
/**
* Creates a new layer.
* @param name the name of the layer
* @param writer the writer
*/
public PdfLayer(String name, PdfWriter writer) {
super(PdfName.OCG);
setName(name);
ref = writer.getPdfIndirectReference();
writer.registerLayer(this);
}
String getTitle() {
return title;
}
/**
* Adds a child layer. Nested layers can only have one parent.
* @param child the child layer
*/
public void addChild(PdfLayer child) {
if (child.parent != null)
throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.layer.1.already.has.a.parent", ((PdfString)child.get(PdfName.NAME)).toUnicodeString()));
child.parent = this;
if (children == null)
children = new ArrayList();
children.add(child);
}
/**
* Gets the parent layer.
* @return the parent layer or null if the layer has no parent
*/
public PdfLayer getParent() {
return parent;
}
/**
* Gets the children layers.
* @return the children layers or null if the layer has no children
*/
public ArrayList getChildren() {
return children;
}
/**
* Gets the PdfIndirectReference that represents this layer.
* @return the PdfIndirectReference that represents this layer
*/
public PdfIndirectReference getRef() {
return ref;
}
/**
* Sets the PdfIndirectReference that represents this layer.
* This can only be done from PdfStamperImp.
* @param ref The reference to the OCG object
* @since 2.1.2
*/
void setRef(PdfIndirectReference ref) {
this.ref = ref;
}
/**
* Sets the name of this layer.
* @param name the name of this layer
*/
public void setName(String name) {
put(PdfName.NAME, new PdfString(name, PdfObject.TEXT_UNICODE));
}
/**
* Gets the dictionary representing the layer. It just returns this.
* @return the dictionary representing the layer
*/
public PdfObject getPdfObject() {
return this;
}
/**
* Gets the initial visibility of the layer.
* @return the initial visibility of the layer
*/
public boolean isOn() {
return this.on;
}
/**
* Sets the initial visibility of the layer.
* @param on the initial visibility of the layer
*/
public void setOn(boolean on) {
this.on = on;
}
private PdfDictionary getUsage() {
PdfDictionary usage = (PdfDictionary)get(PdfName.USAGE);
if (usage == null) {
usage = new PdfDictionary();
put(PdfName.USAGE, usage);
}
return usage;
}
/**
* Used by the creating application to store application-specific
* data associated with this optional content group.
* @param creator a text string specifying the application that created the group
* @param subtype a string defining the type of content controlled by the group. Suggested
* values include but are not limited to Artwork, for graphic-design or publishing
* applications, and Technical, for technical designs such as building plans or
* schematics
*/
public void setCreatorInfo(String creator, String subtype) {
PdfDictionary usage = getUsage();
PdfDictionary dic = new PdfDictionary();
dic.put(PdfName.CREATOR, new PdfString(creator, PdfObject.TEXT_UNICODE));
dic.put(PdfName.SUBTYPE, new PdfName(subtype));
usage.put(PdfName.CREATORINFO, dic);
}
/**
* Specifies the language of the content controlled by this
* optional content group
* @param lang a language string which specifies a language and possibly a locale
* (for example, es-MX represents Mexican Spanish)
* @param preferred used by viewer applications when there is a partial match but no exact
* match between the system language and the language strings in all usage dictionaries
*/
public void setLanguage(String lang, boolean preferred) {
PdfDictionary usage = getUsage();
PdfDictionary dic = new PdfDictionary();
dic.put(PdfName.LANG, new PdfString(lang, PdfObject.TEXT_UNICODE));
if (preferred)
dic.put(PdfName.PREFERRED, PdfName.ON);
usage.put(PdfName.LANGUAGE, dic);
}
/**
* Specifies the recommended state for content in this
* group when the document (or part of it) is saved by a viewer application to a format
* that does not support optional content (for example, an earlier version of
* PDF or a raster image format).
* @param export the export state
*/
public void setExport(boolean export) {
PdfDictionary usage = getUsage();
PdfDictionary dic = new PdfDictionary();
dic.put(PdfName.EXPORTSTATE, export ? PdfName.ON : PdfName.OFF);
usage.put(PdfName.EXPORT, dic);
}
/**
* Specifies a range of magnifications at which the content
* in this optional content group is best viewed.
* @param min the minimum recommended magnification factors at which the group
* should be ON. A negative value will set the default to 0
* @param max the maximum recommended magnification factor at which the group
* should be ON. A negative value will set the largest possible magnification supported by the
* viewer application
*/
public void setZoom(float min, float max) {
if (min <= 0 && max < 0)
return;
PdfDictionary usage = getUsage();
PdfDictionary dic = new PdfDictionary();
if (min > 0)
dic.put(PdfName.MIN_LOWER_CASE, new PdfNumber(min));
if (max >= 0)
dic.put(PdfName.MAX_LOWER_CASE, new PdfNumber(max));
usage.put(PdfName.ZOOM, dic);
}
/**
* Specifies that the content in this group is intended for
* use in printing
* @param subtype a name specifying the kind of content controlled by the group;
* for example, Trapping, PrintersMarks and Watermark
* @param printstate indicates that the group should be
* set to that state when the document is printed from a viewer application
*/
public void setPrint(String subtype, boolean printstate) {
PdfDictionary usage = getUsage();
PdfDictionary dic = new PdfDictionary();
dic.put(PdfName.SUBTYPE, new PdfName(subtype));
dic.put(PdfName.PRINTSTATE, printstate ? PdfName.ON : PdfName.OFF);
usage.put(PdfName.PRINT, dic);
}
/**
* Indicates that the group should be set to that state when the
* document is opened in a viewer application.
* @param view the view state
*/
public void setView(boolean view) {
PdfDictionary usage = getUsage();
PdfDictionary dic = new PdfDictionary();
dic.put(PdfName.VIEWSTATE, view ? PdfName.ON : PdfName.OFF);
usage.put(PdfName.VIEW, dic);
}
/**
* Gets the layer visibility in Acrobat's layer panel
* @return the layer visibility in Acrobat's layer panel
*/
public boolean isOnPanel() {
return this.onPanel;
}
/**
* Sets the visibility of the layer in Acrobat's layer panel. If false
* the layer cannot be directly manipulated by the user. Note that any children layers will
* also be absent from the panel.
* @param onPanel the visibility of the layer in Acrobat's layer panel
*/
public void setOnPanel(boolean onPanel) {
this.onPanel = onPanel;
}
}
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