OnBeforeUnloadWaitStrategy.java

/****************************************************************************
 * Copyright 2008-2011 ThoughtWorks, Inc.
 *
 * 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.
 *
 * Initial Contributors:
 *   Håkan Råberg
 *   Manish Chakravarty
 *   Pavan K S
 ***************************************************************************/
package com.thoughtworks.krypton.driver.web.browser.wait;

import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;

import com.thoughtworks.krypton.driver.web.browser.BrowserSession;
import com.thoughtworks.krypton.driver.web.browser.JavascriptException;

public class OnBeforeUnloadWaitStrategy implements ProgressListener, WaitStrategy {
    private BrowserSession session;

    public void init(BrowserSession session) {
        this.session = session;
        this.session.getBrowser().addProgressListener(this);
        completed(null);
    }

    public boolean isBusy() {
        try {
            if (session.getBrowser().isDisposed()) {
                return false;
            }
            String unloading = session.evaluate("typeof(Twist) !== 'undefined' ? Twist.unloading : undefined");
            return "undefined".equals(unloading) || Boolean.parseBoolean(unloading);
        } catch (JavascriptException e) {
            e.printStackTrace();
            return false;
        }
    }

    public void changed(ProgressEvent event) {
    }

    public void completed(ProgressEvent event) {
        session.execute("if (!Twist) { var Twist = {}; } var unload = function() { Twist.unloading = true; }; Twist.unloading = false; window.addEventListener ? window.addEventListener('beforeunload', unload, true) : window.attachEvent('onbeforeunload', unload);");
    }
}