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-rw-r--r--pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/PDFViewerComposite.java155
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diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/PDFViewerComposite.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/PDFViewerComposite.java
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+/*
+ * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://joinup.ec.europa.eu/software/page/eupl
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ */
+package at.asit.pdfover.gui.composites;
+
+// Imports
+import java.awt.Canvas;
+import java.awt.Dimension;
+import java.awt.Frame;
+import java.awt.Graphics;
+import java.awt.geom.Rectangle2D;
+import java.io.File;
+import java.io.IOException;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.awt.SWT_AWT;
+import org.eclipse.swt.events.KeyAdapter;
+import org.eclipse.swt.events.KeyEvent;
+import org.eclipse.swt.widgets.Composite;
+import org.icepdf.core.exceptions.PDFException;
+import org.icepdf.core.exceptions.PDFSecurityException;
+import org.icepdf.core.pobjects.Document;
+import org.icepdf.core.pobjects.Page;
+import org.icepdf.core.util.GraphicsRenderingHints;
+
+/**
+ * Displays a PDF document
+ */
+public class PDFViewerComposite extends Composite {
+
+ /**
+ * PDF document
+ */
+ protected Document document;
+
+ /**
+ * Currently selected page in the document
+ */
+ protected int page;
+
+ /**
+ * Get the currently selected page in the document
+ * @return current page
+ */
+ public int getPage() {
+ return this.page;
+ }
+
+ /**
+ * Set the visible page in the document
+ * @param page new active page
+ */
+ public void setPage(int page) {
+ this.page = page;
+ this.canvas.repaint();
+ }
+
+ /**
+ * AWT Canvas displaying the document
+ */
+ private Canvas canvas;
+
+ /**
+ * Create the PDF Viewer composite.
+ * @param parent parent Composite
+ * @param style
+ * @param document
+ * @throws PDFException Error parsing PDF document
+ * @throws PDFSecurityException Error decrypting PDF document (not supported)
+ * @throws IOException I/O Error
+ */
+ public PDFViewerComposite(Composite parent, int style, File document) throws PDFException, PDFSecurityException, IOException {
+ super(parent, style);
+ this.document = new Document();
+ this.document.setFile(document.getPath());
+ int pages = this.document.getNumberOfPages();
+
+ final Dimension[] base_dimensions = new Dimension[pages];
+ for (int page = 0; page < pages; ++page)
+ base_dimensions[page] = this.document.getPageDimension(page, 0f, 1.0f).toDimension();
+
+ this.page = pages - 1;
+
+ Frame frame = SWT_AWT.new_Frame(this);
+ this.canvas = new Canvas() {
+ private static final long serialVersionUID = 1L;
+
+ @Override
+ public void paint(Graphics g) {
+ if (g == null || g.getClip() == null)
+ return;
+ int page = getPage();
+ // Make page always fit to window
+ Rectangle2D clip = g.getClip().getBounds2D();
+ double h_zoom = clip.getWidth() / base_dimensions[page].width;
+ double v_zoom = clip.getHeight() / base_dimensions[page].height;
+ float zoom = (float) (h_zoom < v_zoom ? h_zoom : v_zoom);
+ if (v_zoom < h_zoom)
+ {
+ // Page is narrower than window, center it
+ g.translate((int) ((clip.getWidth() - (base_dimensions[page].width * zoom)) / 2), 0);
+ }
+
+ PDFViewerComposite.this.document.paintPage(page, g, GraphicsRenderingHints.SCREEN, Page.BOUNDARY_CROPBOX, 0f, zoom);
+ }
+ };
+ frame.add(this.canvas);
+ frame.pack();
+ frame.setVisible(true);
+
+ this.addKeyListener(new KeyAdapter() {
+ @Override
+ public void keyPressed(KeyEvent e) {
+ int page = getPage();
+ int old_page = page;
+
+ switch (e.keyCode)
+ {
+ case SWT.PAGE_DOWN:
+ if (page < (PDFViewerComposite.this.document.getNumberOfPages() - 1))
+ ++page;
+ break;
+
+ case SWT.PAGE_UP:
+ if (page > 0)
+ --page;
+ break;
+
+ case SWT.END:
+ page = (PDFViewerComposite.this.document.getNumberOfPages() - 1);
+ break;
+
+ case SWT.HOME:
+ page = 0;
+ break;
+ }
+
+ if (page != old_page)
+ setPage(page);
+ }
+ });
+ }
+}