ResizableDialogDragHandler.java

/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 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.
 *
 * Portions Copyright 2008-2013 Pentaho Corporation.  All rights reserved.
 * Portions Copyright 2009 - Fred Sauer
 */

package org.pentaho.gwt.widgets.client.dialogs;

import com.allen_sauer.gwt.dnd.client.DragEndEvent;
import com.allen_sauer.gwt.dnd.client.DragHandler;
import com.allen_sauer.gwt.dnd.client.DragStartEvent;
import com.allen_sauer.gwt.dnd.client.VetoDragException;
import com.google.gwt.user.client.ui.HTML;

/**
 * Shared drag handler which display events as they are received by the various drag controllers.
 */
public final class ResizableDialogDragHandler implements DragHandler {

  /**
   * CSS blue.
   */
  protected static final String BLUE = "#4444BB"; //$NON-NLS-1$

  /**
   * CSS green.
   */
  protected static final String GREEN = "#44BB44"; //$NON-NLS-1$

  /**
   * CSS red.
   */
  protected static final String RED = "#BB4444"; //$NON-NLS-1$

  /**
   * Text area where event messages are shown.
   */
  private final HTML eventTextArea;

  ResizableDialogDragHandler( HTML dragHandlerHTML ) {
    eventTextArea = dragHandlerHTML;
  }

  /**
   * Log the drag end event.
   * 
   * @param event
   *          the event to log
   */
  public void onDragEnd( DragEndEvent event ) {
    log( "onDragEnd: " + event, RED ); //$NON-NLS-1$
  }

  /**
   * Log the drag start event.
   * 
   * @param event
   *          the event to log
   */
  public void onDragStart( DragStartEvent event ) {
    log( "onDragStart: " + event, GREEN ); //$NON-NLS-1$
  }

  /**
   * Log the preview drag end event.
   * 
   * @param event
   *          the event to log
   * @throws VetoDragException
   *           exception which may be thrown by any drag handler
   */
  public void onPreviewDragEnd( DragEndEvent event ) throws VetoDragException {
    log( "<br>onPreviewDragEnd: " + event, BLUE ); //$NON-NLS-1$
  }

  /**
   * Log the preview drag start event.
   * 
   * @param event
   *          the event to log
   * @throws VetoDragException
   *           exception which may be thrown by any drag handler
   */
  public void onPreviewDragStart( DragStartEvent event ) throws VetoDragException {
    clear();
    log( "onPreviewDragStart: " + event, BLUE ); //$NON-NLS-1$
  }

  protected void clear() {
    eventTextArea.setHTML( "" ); //$NON-NLS-1$
  }

  protected void log( String text, String color ) {
    eventTextArea.setHTML( eventTextArea.getHTML()
        + ( eventTextArea.getHTML().length() == 0 ? "" : "<br>" ) + "<span style='color: " + color //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
        + "'>" + text + "</span>" ); //$NON-NLS-1$ //$NON-NLS-2$
  }
}