org.eclipse.zest.custom.sequence.widgets.internal.ErrorComposite.java Source code

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Here is the source code for org.eclipse.zest.custom.sequence.widgets.internal.ErrorComposite.java

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/*******************************************************************************
 * Copyright (c) 2009 the CHISEL group and contributors.
 * 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:
 *    Del Myers -- initial API and implementation
 *******************************************************************************/
package org.eclipse.zest.custom.sequence.widgets.internal;

import java.io.PrintWriter;
import java.io.StringWriter;

import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

/**
 * A composite designed for displaying an error.
 * @author Del Myers
 *
 */
public class ErrorComposite extends Composite {
    private String detailsString;
    private Composite page;
    private Text details;
    private Label message;
    private boolean showingDetails;
    private Composite detailsPage;
    private Button detailsButton;

    /**
     * Creates a composite with an error icon, a details button, and a text area to display the 
     * error.
     * @param parent
     * @param style
     */
    public ErrorComposite(Composite parent, int style) {
        super(parent, style);
        setLayout(new FillLayout());
        this.page = new Composite(this, SWT.NONE);
        page.setLayout(new GridLayout(2, false));
        message = new Label(page, SWT.READ_ONLY | SWT.WRAP);
        message.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, true, false));
        message.setImage(getDisplay().getSystemImage(SWT.ICON_ERROR));
        detailsButton = new Button(page, SWT.PUSH);
        detailsButton.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                showingDetails = !showingDetails;
                updateDetails();
            }
        });
        detailsButton.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false));
        this.showingDetails = false;
        this.detailsPage = new Composite(page, SWT.NONE);
        GridData pageData = new GridData(SWT.FILL, SWT.FILL, true, true);
        pageData.horizontalSpan = 2;
        detailsPage.setLayoutData(pageData);
        detailsPage.setLayout(new FillLayout());
        updateDetails();
    }

    /**
     * 
     */
    private void updateDetails() {
        if (!showingDetails) {
            detailsButton.setText(IDialogConstants.SHOW_DETAILS_LABEL);
            if (details != null && !details.isDisposed()) {
                details.dispose();
                details = null;
            }
        } else {
            detailsButton.setText(IDialogConstants.HIDE_DETAILS_LABEL);
            if (details == null || details.isDisposed()) {
                details = new Text(detailsPage, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
                details.setEditable(false);
            }
            details.setText(getDetailsText());
            detailsPage.layout();
        }
        layout(true, true);
    }

    /**
     * @return
     */
    private String getDetailsText() {
        if (detailsString == null) {
            return "";
        }
        return detailsString;
    }

    public void setError(Throwable t) {
        if (t == null) {
            message.setText("");
            detailsString = "";
        } else {
            String m = t.getMessage();
            message.setText((m != null) ? m : "Error");
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            t.printStackTrace(pw);
            pw.flush();
            pw.close();
            detailsString = sw.toString();
        }
        updateDetails();

    }

}