Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU 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 General Public License for more

 * details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program; if not, write to the Free Software Foundation, Inc., 51

 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us at info AT

 * gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.app.extension;

import org.gvsig.andami.IconThemeHelper;

import org.gvsig.andami.plugins.Extension;

import org.gvsig.app.ApplicationLocator;

import org.gvsig.app.ApplicationManager;

import org.gvsig.app.project.documents.view.ViewDocument;

import org.gvsig.app.project.documents.view.gui.IView;

import org.gvsig.fmap.mapcontext.ViewPort;

/**

 * Extensi?n que cambia el extent de la vista al extent anterior.

 */

public class ZoomPrev extends Extension {

  public void postInitialize() {}

  public void initialize() {

    IconThemeHelper.registerIcon("action", "view-navigation-zoom-back", this);

  }

  public boolean isEnabled() {

    ApplicationManager application = ApplicationLocator.getManager();

    IView view = (IView) application.getActiveComponent(ViewDocument.class);

    if (view == null) {

      return false;

    }

    ViewDocument document = view.getViewDocument();

    ViewPort vp = document.getMapContext().getViewPort();

    return vp.getEnvelopes().hasPrevious();

  }

  public boolean isVisible() {

    ApplicationManager application = ApplicationLocator.getManager();

    IView view = (IView) application.getActiveComponent(ViewDocument.class);

    if (view == null) {

      return false;

    }

    ViewDocument document = view.getViewDocument();

    return document.getMapContext().getLayers().getLayersCount() > 0;

  }

  public void execute(String arg0) {

    ApplicationManager application = ApplicationLocator.getManager();

    IView view = (IView) application.getActiveComponent(ViewDocument.class);

    if (view == null) {

      return;

    }

    ViewDocument document = view.getViewDocument();

    ViewPort vp = document.getMapContext().getViewPort();

    vp.setPreviousEnvelope();

    document.setModified(true);

    ApplicationLocator.getManager().refreshMenusAndToolBars();

  }

}