/*******************************************************************************
 * Copyright (c) 2005, 2010 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.tests.api.workbenchpart;

import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.part.ViewPart;
import org.eclipse.ui.tests.TestPlugin;

public class HeavyResourceView extends ViewPart {

    private Button useAllComposites;
    private Button releaseAllComposites;

    private Shell tempShell;
    private Composite control;

    @Override
	public void createPartControl(Composite parent) {
        control = parent;

        SelectionListener listener = new SelectionAdapter() {
          @Override
		public void widgetSelected(SelectionEvent e) {
                super.widgetSelected(e);

                if (e.widget == useAllComposites) {
                    useAll();
                } else if (e.widget == releaseAllComposites) {
                    releaseAll();
                }
            }
        };

        Label explanation = new Label(parent, SWT.WRAP);
        explanation.setText("This view allocates all available SWT resources on demand. "
                + "This is not supposed to be a recoverable error, and is expected to crash the workbench. "
                + "This view allows us observe the workbench when it crashes in this manner.");

        useAllComposites = new Button(parent, SWT.PUSH);
        useAllComposites.setText("&Allocate all available composites (very slow!)");
        useAllComposites.addSelectionListener(listener);

        releaseAllComposites = new Button(parent, SWT.PUSH);
        releaseAllComposites.setText("&Release all composites");
        releaseAllComposites.addSelectionListener(listener);

    }

    @Override
	public void setFocus() {
        control.setFocus();
    }

    public void useAll() {
        releaseAll();
        tempShell = new Shell(Display.getCurrent(), SWT.NONE);
        try {
            for(;;) {
                new Composite(tempShell, SWT.NONE);
            }
        } catch (SWTError e) {
            TestPlugin.getDefault().getLog().log(WorkbenchPlugin.getStatus(e));
        }
    }

    public void releaseAll() {
        if (tempShell != null) {
            tempShell.dispose();
            tempShell = null;
        }
    }

    @Override
	public void dispose() {
        releaseAll();
        super.dispose();
    }

}