defaultelementrenderer.java

报表设计软件,很好的

/**
 * ========================================
 * JFreeReport : a free Java report library
 * ========================================
 *
 * Project Info:  http://www.jfree.org/jfreereport/index.html
 * Project Lead:  Thomas Morgner ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Simba Management Limited and Contributors.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * ------------------------------
 * DefaultElementRenderer.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: DefaultElementRenderer.java,v 1.2 2004/04/20 18:54:56 taqua Exp $
 *
 * Changes
 * -------------------------
 * 28.09.2003 : Initial version
 *
 */

package org.jfree.designer.visualeditor.bandeditor;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;
import javax.swing.border.LineBorder;

import org.jfree.report.Element;
import org.jfree.report.filter.templates.LabelTemplate;
import org.jfree.report.filter.templates.StringFieldTemplate;
import org.jfree.report.filter.templates.Template;
import org.jfree.report.modules.parser.ext.factory.templates.DefaultTemplateCollection;
import org.jfree.report.modules.parser.ext.factory.templates.TemplateCollector;
import org.jfree.report.style.ElementStyleSheet;
import org.jfree.report.util.Log;

public final class DefaultElementRenderer
        extends JComponent
        implements ElementRenderer
{
  private Element element;

  public DefaultElementRenderer ()
  {
    setDoubleBuffered(false);
  }

  public final JComponent getElementRenderer
          (final Element element, final boolean isSelected, final boolean hasFocus,
           final float detail)
  {
    if (isSelected)
    {
      setBackground(Color.blue);
    }
    else
    {
      setBackground(Color.white);
    }
    if (hasFocus)
    {
      setBorder(new LineBorder(Color.green));
    }
    else
    {
      setBorder(null);
    }
    setElement(element);
    return this;
  }

  public final Element getElement ()
  {
    return element;
  }

  public final void setElement (final Element element)
  {
    this.element = element;
  }

  /**
   * If the UI delegate is non-null, call its paint method.  We pass the delegate a copy
   * of the Graphics object to protect the rest of the paint code from irrevocable changes
   * (e.g. Graphics.translate()).
   *
   * @see #paint
   */
  protected final void paintComponent (final Graphics g)
  {
    final Graphics2D g2 = (Graphics2D) g;

    Log.debug("Painting Component: " + getElement().getName());
    final Rectangle2D relElementRect = (Rectangle2D)
            element.getStyle().getStyleProperty(ElementStyleSheet.BOUNDS);
    if (relElementRect == null)
    {
      super.paintComponent(g);
      Log.debug("Aborted Painting Component: " + getElement().getName());
      return;
    }

    // calculate the name for display, default is just the element name
    String elementType = null;
    if (element.getDataSource() instanceof Template)
    {
      final Template template = (Template) element.getDataSource();
      if (template instanceof LabelTemplate)
      {
        elementType = "Label";
      }
      else if (template instanceof StringFieldTemplate)
      {
        final StringFieldTemplate sft = (StringFieldTemplate) template;
        elementType = "String-Field: " + sft.getField();
      }
      else
      {
        elementType = template.getClass().getName();
      }
      // feeeeeed me : more element types here ...
      // make this generic (OO!) instead of hardcoding ...
      final TemplateCollector templateCollector = new TemplateCollector();
      templateCollector.addTemplateCollection(new DefaultTemplateCollection());
    }

    // show the element name as information. Here a lot remains to be done:
    // calc font, evaluate vertical and horizontal alignment,
    // cut name  at end of element etc.
    // display label content instead of label name,
    // display example or name (requires change in parser?), make this
    // switchable in checkbox...
    // we keep the color => a selected element will have text in red/blue
    String elementName = element.getName();
    if (elementName.startsWith(Element.ANONYMOUS_ELEMENT_PREFIX))
    {
      elementName = elementType;
    }
    else
    {
      elementName = elementType + ": " + elementName;
    }

    g2.setPaint((Paint) element.getStyle().getStyleProperty(ElementStyleSheet.PAINT));
    g2.setFont(element.getStyle().getFontDefinitionProperty().getFont());
    final float lineheight = g.getFontMetrics().getAscent();
    g.drawString(elementName, 0, (int) (0 + lineheight));
    // todo: beautify: text size from band heigt, display centered, if possible

  }


}