add PDFViewerComposite

git-svn-id: https://svn.iaik.tugraz.at/svn/egiz/prj/current/12PDF-OVER-4.0@12398 3a0b52a2-8410-0410-bc02-ff6273a87459

1 files changed, 155 insertions, 0 deletions

diff --git a/trunk/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/PDFViewerComposite.java b/trunk/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/PDFViewerComposite.java
new file mode 100644
index 00000000..1637da9e
--- /dev/null
+++ b/trunk/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/PDFViewerComposite.java
@@ -0,0 +1,155 @@
+/*
+ * 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);
+			}
+		});
+	}
+}