bz.davide.dmweb.shared.view.DMGwtWidgetHostAttachHandler.java Source code

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Here is the source code for bz.davide.dmweb.shared.view.DMGwtWidgetHostAttachHandler.java

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/*
DMWeb - Java web framework - http://www.davide.bz/dmweb
    
Copyright (C) 2013-2014 Davide Montesin <d@vide.bz> - Bolzano/Bozen - Italy
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
    
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/

package bz.davide.dmweb.shared.view;

import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * @author Davide Montesin <d@vide.bz>
 */
public final class DMGwtWidgetHostAttachHandler implements AttachListener {
    AbstractHtmlElementView widget;
    DMGwtWidgetHostFactory factory;
    transient HTMLPanel htmlPanel;
    transient Widget gwtWidget = null;

    public DMGwtWidgetHostAttachHandler(AbstractHtmlElementView widget, DMGwtWidgetHostFactory factory) {
        super();
        this.widget = widget;
        this.factory = factory;
    }

    DMGwtWidgetHostAttachHandler() {
    }

    @Override
    public void onAttachOrDetach(AttachEvent event) {
        if (event.isAttached()) {
            if (this.gwtWidget == null) {
                this.gwtWidget = this.factory.create();
            }
            (this.htmlPanel = HTMLPanel.wrap(this.widget.getElement())).add(this.gwtWidget);
        } else {
            RootPanel.detachNow(this.htmlPanel);
            this.htmlPanel = null;
        }
    }
}