gov.nasa.ensemble.common.ui.ScrollableMessageDialog.java Source code

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Here is the source code for gov.nasa.ensemble.common.ui.ScrollableMessageDialog.java

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/*******************************************************************************
 * Copyright 2014 United States Government as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package gov.nasa.ensemble.common.ui;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * The ScrollableMessageDialog is a modal dialog with the given text message in
 * a scrollable area. The text message is not manipulatable by the user.
 */
public class ScrollableMessageDialog extends MessageDialog {

    private static final int DEFAULT_FONT_HEIGHT;
    private static final Font FONT;

    /** initialize the default font size based on the operating system at runtime */
    static {
        String os = System.getProperty("osgi.os");
        if (os == null) {
            DEFAULT_FONT_HEIGHT = 8;
        } else if (os.startsWith("win")) {
            DEFAULT_FONT_HEIGHT = 8;
        } else if (os.startsWith("mac")) {
            DEFAULT_FONT_HEIGHT = 12;
        } else {
            DEFAULT_FONT_HEIGHT = 8;
        }
        FONT = new Font(null, new FontData("Courier", DEFAULT_FONT_HEIGHT, SWT.NORMAL));
    }

    /**
     * Construct a ScrollableMessageDialog
     * 
     * @param parent
     * @param title
     * @param message
     */
    public ScrollableMessageDialog(Shell parent, String title, String message) {
        super(parent, title, null, message, MessageDialog.NONE, new String[] {}, 0);

        if (System.getProperty("os.name").toLowerCase().contains("linux"))
            setShellStyle(getShellStyle() | SWT.RESIZE);
        else
            setShellStyle((getShellStyle() ^ SWT.APPLICATION_MODAL) | SWT.ON_TOP | SWT.RESIZE);

    }

    /**
     * Create the contents of the dialog using a scrollable Text widget.
     * 
     * @param parent
     *            the parent widget.
     */
    @Override
    protected Control createContents(Composite parent) {
        Text text = new Text(parent, SWT.MULTI | SWT.READ_ONLY | SWT.V_SCROLL | SWT.H_SCROLL);
        text.setText(message);
        text.setFont(FONT);
        GridData textLayoutData = new GridData(SWT.CENTER, SWT.CENTER, true, true);
        textLayoutData.grabExcessHorizontalSpace = true;
        textLayoutData.grabExcessVerticalSpace = true;
        text.setLayoutData(textLayoutData);
        text.setText(message);
        parent.setLayout(new GridLayout());
        parent.setLayoutData(new GridData(GridData.FILL_BOTH));
        parent.setSize(400, 600);
        return parent;
    }

}