bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/common/ImageTooltip.java

/*******************************************************************************
 * Copyright (c) 2010 BestSolution.at and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
 ******************************************************************************/
package org.eclipse.e4.tools.emf.ui.common;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.DecimalFormat;
import java.text.MessageFormat;
import org.eclipse.e4.tools.emf.ui.internal.Messages;
import org.eclipse.emf.common.util.URI;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.window.ToolTip;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;

public abstract class ImageTooltip extends ToolTip {
	private Image image;
	private Messages Messages;

	public ImageTooltip(Control control, Messages Messages) {
		super(control);
		this.Messages = Messages;
	}

	@Override
	protected boolean shouldCreateToolTip(Event event) {
		if (getImageURI() != null) {
			return super.shouldCreateToolTip(event);
		}
		return false;
	}

	@Override
	protected Composite createToolTipContentArea(Event event, Composite parent) {
		clearResources();
		parent = new Composite(parent, SWT.NONE);
		parent.setBackground(event.widget.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND));
		parent.setBackgroundMode(SWT.INHERIT_DEFAULT);
		parent.setLayout(new GridLayout(2, false));

		URI uri = getImageURI();

		if (uri != null) {
			int fileSize = -1;
			ByteArrayOutputStream out = null;
			InputStream stream = null;
			InputStream bStream = null;
			String errorMessage = "<" + Messages.ImageTooltip_UnknownError + ">"; //$NON-NLS-1$ //$NON-NLS-2$
			try {
				URL url;
				try {
					url = new URL(uri.toString());
					stream = url.openStream();
				} catch (Exception e) {
					// FIXME Temporary fix to show icon
					// If not found in runtime search in workspace
					if (stream == null) {
						String[] segments = uri.segments();
						URI tmpUri = URI.createPlatformResourceURI(segments[1], true);
						for (int i = 2; i < segments.length; i++) {
							tmpUri = tmpUri.appendSegment(segments[i]);
						}

						url = new URL(tmpUri.toString());
						stream = url.openStream();
					}
				}

				if (stream != null) {
					out = new ByteArrayOutputStream();
					byte[] buf = new byte[1024];
					int length;
					while ((length = stream.read(buf)) != -1) {
						out.write(buf, 0, length);
					}
					fileSize = out.size();
					bStream = new ByteArrayInputStream(out.toByteArray());
					image = new Image(parent.getDisplay(), bStream);
				}
			} catch (MalformedURLException e) {
				errorMessage = e.getMessage();
			} catch (FileNotFoundException e) {
				if (uri.isPlatform()) {
					errorMessage = MessageFormat.format(Messages.ImageTooltip_FileNotFound, e.getMessage(), uri.segment(1));
				} else {
					errorMessage = e.getMessage();
				}
			} catch (IOException e) {
				errorMessage = e.getMessage();
			} catch (Exception e) {
				errorMessage = e.getMessage();
			} finally {
				if (out != null) {
					try {
						out.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}

				if (bStream != null) {
					try {
						bStream.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}

				if (stream != null) {
					try {
						stream.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}

			// ---------------------------------
			Label l = new Label(parent, SWT.NONE);
			l.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DIALOG_FONT));
			l.setText(Messages.ImageTooltip_Icon + ":"); //$NON-NLS-1$

			l = new Label(parent, SWT.NONE);
			if (image == null) {
				System.err.println(errorMessage);
				l.setText(errorMessage);
			} else {
				l.setImage(image);
			}

			// ---------------------------------

			l = new Label(parent, SWT.NONE);
			l.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DIALOG_FONT));
			l.setText(Messages.ImageTooltip_Name + ":"); //$NON-NLS-1$

			l = new Label(parent, SWT.NONE);
			l.setText(uri.lastSegment());

			// ---------------------------------

			l = new Label(parent, SWT.NONE);
			l.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DIALOG_FONT));
			l.setText(Messages.ImageTooltip_Dimension + ":"); //$NON-NLS-1$

			l = new Label(parent, SWT.NONE);
			if (image != null) {
				l.setText(image.getBounds().width + "x" + image.getBounds().height + " px"); //$NON-NLS-1$ //$NON-NLS-2$
			} else {
				l.setText("0x0 px"); //$NON-NLS-1$
			}

			// ---------------------------------

			l = new Label(parent, SWT.NONE);
			l.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DIALOG_FONT));
			l.setText(Messages.ImageTooltip_FileSize + ":"); //$NON-NLS-1$

			l = new Label(parent, SWT.NONE);
			l.setText(new DecimalFormat("#,##0.00").format((fileSize / 1024.0)) + "KB"); //$NON-NLS-1$ //$NON-NLS-2$
		}

		return parent;
	}

	@Override
	protected void afterHideToolTip(Event event) {
		super.afterHideToolTip(event);
		clearResources();
	}

	protected abstract URI getImageURI();

	private void clearResources() {
		if (image != null) {
			image.dispose();
			image = null;
		}
	}
}