/*
 * Copyright (c) 2010, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.impl.threads;

import org.jowidgets.api.threads.IUiThreadAccess;
import org.jowidgets.api.toolkit.Toolkit;
import org.jowidgets.api.widgets.IWindow;
import org.jowidgets.common.threads.IUiThreadAccessCommon;
import org.jowidgets.spi.IWidgetsServiceProvider;

public class UiThreadAccess implements IUiThreadAccess {

    private final IUiThreadAccessCommon uiThreadAccessCommon;

    public UiThreadAccess(final IWidgetsServiceProvider widgetsServiceProvider) {
        super();
        this.uiThreadAccessCommon = widgetsServiceProvider.createUiThreadAccess();
    }

    @Override
    public boolean isUiThread() {
        return uiThreadAccessCommon.isUiThread();
    }

    @Override
    public void invokeLater(final Runnable runnable) {
        uiThreadAccessCommon.invokeLater(runnable);
    }

    @Override
    public void invokeAndWait(final Runnable runnable) throws InterruptedException {
        uiThreadAccessCommon.invokeAndWait(runnable);
    }

    @Override
    public void disableAllWindowsWhile(final Runnable runnable) {
        if (isUiThread()) {
            blockEvents(runnable);
        }
        else {
            try {
                invokeAndWait(new Runnable() {
                    @Override
                    public void run() {
                        blockEvents(runnable);
                    }
                });
            }
            catch (final InterruptedException e) {
                throw new RuntimeException("Error while blocking events");
            }
        }
    }

    private void blockEvents(final Runnable runnable) {
        for (final IWindow window : Toolkit.getAllWindows()) {
            window.setEnabled(false);
        }
        try {
            runnable.run();
        }
        catch (final RuntimeException e) {
            throw e;
        }
        catch (final Exception e) {
            throw new RuntimeException("Error while blocking events.", e);
        }
        finally {
            for (final IWindow window : Toolkit.getAllWindows()) {
                window.setEnabled(true);
            }
        }
    }

}