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/*
* $Id: PdfReaderController.java 4050 2009-08-22 17:31:27Z xlv $
*
* Copyright 2007 Bruno Lowagie.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.lowagie.rups.controller;
import java.util.Observable;
import java.util.Observer;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.event.TreeSelectionListener;
import com.lowagie.rups.model.ObjectLoader;
import com.lowagie.rups.model.PdfFile;
import com.lowagie.rups.model.TreeNodeFactory;
import com.lowagie.rups.view.PageSelectionListener;
import com.lowagie.rups.view.RupsMenuBar;
import com.lowagie.rups.view.itext.FormTree;
import com.lowagie.rups.view.itext.OutlineTree;
import com.lowagie.rups.view.itext.PagesTable;
import com.lowagie.rups.view.itext.PdfObjectPanel;
import com.lowagie.rups.view.itext.PdfTree;
import com.lowagie.rups.view.itext.StreamTextArea;
import com.lowagie.rups.view.itext.XRefTable;
import com.lowagie.rups.view.itext.treenodes.PdfObjectTreeNode;
import com.lowagie.rups.view.itext.treenodes.PdfTrailerTreeNode;
import com.lowagie.text.pdf.PRStream;
import com.lowagie.text.pdf.PdfObject;
/**
* Controls the GUI components that get their content from iText's PdfReader.
*/
public class PdfReaderController extends Observable implements Observer {
/** Treeview of the PDF file. */
protected PdfTree pdfTree;
/** Tabbed Pane containing other components. */
protected JTabbedPane navigationTabs;
/** JTable with all the pages and their labels. */
protected PagesTable pages;
/** Treeview of the outlines. */
protected OutlineTree outlines;
/** Treeview of the form. */
protected FormTree form;
/** JTable corresponding with the CrossReference table. */
protected XRefTable xref;
/** A panel that will show PdfObjects. */
protected PdfObjectPanel objectPanel;
/** Tabbed Pane containing other components. */
protected JTabbedPane editorTabs;
/** A panel that will show a stream. */
protected StreamTextArea streamArea;
/** The factory producing tree nodes. */
protected TreeNodeFactory nodes;
/**
* Constructs the PdfReaderController.
* This is an Observable object to which all iText related GUI components
* are added as Observers.
* @param treeSelectionListener when somebody selects a tree node, this listener listens to the event
* @param pageSelectionListener when somebody changes a page, this listener changes accordingly
*/
public PdfReaderController(TreeSelectionListener treeSelectionListener,
PageSelectionListener pageSelectionListener) {
pdfTree = new PdfTree();
pdfTree.addTreeSelectionListener(treeSelectionListener);
addObserver(pdfTree);
pages = new PagesTable(this, pageSelectionListener);
addObserver(pages);
outlines = new OutlineTree(this);
addObserver(outlines);
form = new FormTree(this);
addObserver(form);
xref = new XRefTable(this);
addObserver(xref);
navigationTabs = new JTabbedPane();
navigationTabs.addTab("Pages", null, new JScrollPane(pages), "Pages");
navigationTabs.addTab("Outlines", null, new JScrollPane(outlines), "Outlines (Bookmarks)");
navigationTabs.addTab("Form", null, new JScrollPane(form), "Interactive Form");
navigationTabs.addTab("XFA", null, form.getXfaTree(), "Tree view of the XFA form");
navigationTabs.addTab("XRef", null, new JScrollPane(xref), "Cross-reference table");
objectPanel = new PdfObjectPanel();
addObserver(objectPanel);
streamArea = new StreamTextArea();
addObserver(streamArea);
editorTabs = new JTabbedPane();
editorTabs.addTab("Stream", null, streamArea, "Stream");
editorTabs.addTab("XFA", null, form.getXfaTextArea(), "XFA Form XML file");
}
/**
* Getter for the PDF Tree.
* @return the PdfTree object
*/
public PdfTree getPdfTree() {
return pdfTree;
}
/**
* Getter for the tabs that allow you to navigate through
* the PdfTree quickly (pages, form, outlines, xref table).
* @return a JTabbedPane
*/
public JTabbedPane getNavigationTabs() {
return navigationTabs;
}
/**
* Getter for the panel that will show the contents
* of a PDF Object (except for PdfStreams: only the
* Stream Dictionary will be shown; the content stream
* is shown in a StreamTextArea object).
* @return the PdfObjectPanel
*/
public PdfObjectPanel getObjectPanel() {
return objectPanel;
}
/**
* Getter for the tabs with the editor windows
* (to which the Console window will be added).
*/
public JTabbedPane getEditorTabs() {
return editorTabs;
}
/**
* Getter for the object that holds the TextArea
* with the content stream of a PdfStream object.
* @return a StreamTextArea
*/
public StreamTextArea getStreamArea() {
return streamArea;
}
/**
* Starts loading the PDF Objects in background.
* @param file the wrapper object that holds the PdfReader as member variable
*/
public void startObjectLoader(PdfFile file) {
setChanged();
notifyObservers();
setChanged();
new ObjectLoader(this, file.getPdfReader());
}
/**
* The GUI components that show the internals of a PDF file,
* can only be shown if all objects are loaded into the
* IndirectObjectFactory using the ObjectLoader.
* As soon as this is done, the GUI components are notified.
* @param obj in this case the Object should be an ObjectLoader
* @see java.util.Observable#notifyObservers(java.lang.Object)
*/
@Override
public void notifyObservers(Object obj) {
if (obj instanceof ObjectLoader) {
ObjectLoader loader = (ObjectLoader)obj;
nodes = loader.getNodes();
PdfTrailerTreeNode root = pdfTree.getRoot();
root.setTrailer(loader.getReader().getTrailer());
root.setUserObject("PDF Object Tree");
nodes.expandNode(root);
}
super.notifyObservers(obj);
}
/**
* Selects a node in the PdfTree.
* @param node a node in the PdfTree
*/
public void selectNode(PdfObjectTreeNode node) {
pdfTree.selectNode(node);
}
/**
* Selects a node in the PdfTree.
* @param objectNumber a number of a node in the PdfTree
*/
public void selectNode(int objectNumber) {
selectNode(nodes.getNode(objectNumber));
}
/**
* Renders the syntax of a PdfObject in the objectPanel.
* If the object is a PDF Stream, then the stream is shown
* in the streamArea too.
*/
public void render(PdfObject object) {
objectPanel.render(object);
streamArea.render(object);
if (object instanceof PRStream) {
editorTabs.setSelectedComponent(streamArea);
}
else {
editorTabs.setSelectedIndex(editorTabs.getComponentCount() - 1);
}
}
/**
* Selects the row in the pageTable that corresponds with
* a certain page number.
* @param pageNumber the page number that needs to be selected
*/
public void gotoPage(int pageNumber) {
pageNumber--;
if (pages == null || pages.getSelectedRow() == pageNumber)
return;
if (pageNumber < pages.getRowCount())
pages.setRowSelectionInterval(pageNumber, pageNumber);
}
/**
* Forwards updates from the RupsController to the Observers of this class.
* @param observable this should be the RupsController
* @param obj the object that has to be forwarded to the observers of PdfReaderController
* @see java.util.Observer#update(java.util.Observable, java.lang.Object)
*/
public void update(Observable observable, Object obj) {
if (RupsMenuBar.CLOSE.equals(obj)) {
setChanged();
notifyObservers(null);
nodes = null;
}
if (obj instanceof PdfObjectTreeNode) {
PdfObjectTreeNode node = (PdfObjectTreeNode)obj;
nodes.expandNode(node);
if (node.isRecursive()) {
pdfTree.selectNode(node.getAncestor());
return;
}/*
if (node.isIndirect()) {
xref.selectRowByReference(node.getNumber());
return;
}*/
render(node.getPdfObject());
}
}
}
