point2dpropertyeditor.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.
 *
 * ------------------------------
 * Dimension2DPropertyEditor.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: Point2DPropertyEditor.java,v 1.2 2004/04/20 18:54:42 taqua Exp $
 *
 * Changes
 * -------------------------
 * 25.10.2003 : Initial version
 *
 */

package org.jfree.designer.propertyeditors;

import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Point2D;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JTextField;

public final class Point2DPropertyEditor
        extends AbstractPropertyEditor
{
  private final class TextChangeHandler
          implements ActionListener
  {
    public TextChangeHandler ()
    {
    }

    /**
     * Invoked when an action occurs.
     */
    public final void actionPerformed (final ActionEvent e)
    {
      setValue(getValue());
    }
  }

  private final JTextField posX;
  private final JTextField posY;
  private final JComponent editor;

  public Point2DPropertyEditor ()
  {
    posX = new JTextField();
    posY = new JTextField();
    posX.addActionListener(new TextChangeHandler());
    posY.addActionListener(new TextChangeHandler());

    editor = new EnableForwardPanel();
    editor.setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 0;
    editor.add(new JLabel("X:"), gbc);

    gbc = new GridBagConstraints();
    gbc.gridx = 1;
    gbc.gridy = 0;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.weightx = 1;
    editor.add(posX, gbc);

    gbc = new GridBagConstraints();
    gbc.gridx = 2;
    gbc.gridy = 0;
    editor.add(new JLabel("Y:"), gbc);

    gbc = new GridBagConstraints();
    gbc.gridx = 3;
    gbc.gridy = 0;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.weightx = 1;
    editor.add(posY, gbc);
  }

  /**
   * Set (or change) the object that is to be edited.  Primitive types such as "int" must
   * be wrapped as the corresponding object type such as "java.lang.Integer".
   *
   * @param value The new target object to be edited.  Note that this object should not be
   *              modified by the PropertyEditor, rather the PropertyEditor should create
   *              a new object to hold any modified value.
   */
  public final void setValue (final Object value)
  {
    final Point2D point = (Point2D) value;
    if (point == null)
    {
      super.setValue(null);
      posY.setText(String.valueOf(0f));
      posX.setText(String.valueOf(0f));
    }
    else
    {
      super.setValue(point.clone());
      posY.setText(String.valueOf((float) point.getY()));
      posX.setText(String.valueOf((float) point.getX()));
    }
  }

  /**
   * Gets the property value.
   *
   * @return The value of the property.  Primitive types such as "int" will be wrapped as
   *         the corresponding object type such as "java.lang.Integer".
   */
  public final Object getValue ()
  {
    Point2D dim = (Point2D) super.getValue();
    if (dim == null)
    {
      dim = new Point2D.Float();
    }
    else
    {
      dim = (Point2D) dim.clone();
    }
    try
    {
      dim.setLocation(Double.parseDouble(posX.getText()),
              Double.parseDouble(posY.getText()));
    }
    catch (Exception e)
    {
      return null;
    }
    return dim;
  }

  /**
   * A PropertyEditor may choose to make available a full custom Component that edits its
   * property value.  It is the responsibility of the PropertyEditor to hook itself up to
   * its editor Component itself and to report property value changes by firing a
   * PropertyChange event. <P> The higher-level code that calls getCustomEditor may either
   * embed the Component in some larger property sheet, or it may put it in its own
   * individual dialog, or ...
   *
   * @return A java.awt.Component that will allow a human to directly edit the current
   *         property value.  May be null if this is not supported.
   */

  public final Component getCustomEditor ()
  {
    return editor;
  }

  /**
   * Set the property value by parsing a given String.  May raise
   * java.lang.IllegalArgumentException if either the String is badly formatted or if this
   * kind of property can't be expressed as text.
   *
   * @param text The string to be parsed.
   */
  public final void setAsText (final String text)
          throws IllegalArgumentException
  {
    throw new IllegalArgumentException("This property cannot be expressed as text.");
  }

  /**
   * Gets the property value as text.
   *
   * @return The property value as a human editable string. <p>   Returns null if the
   *         value can't be expressed as an editable string. <p>   If a non-null value is
   *         returned, then the PropertyEditor should be prepared to parse that string
   *         back in setAsText().
   */
  public final String getAsText ()
  {
    return null;
  }

  /**
   * This method is intended for use when generating Java code to set the value of the
   * property.  It should return a fragment of Java code that can be used to initialize a
   * variable with the current property value.
   * <p/>
   * Example results are "2", "new Color(127,127,34)", "Color.orange", etc.
   *
   * @return A fragment of Java code representing an initializer for the current value.
   */
  public final String getJavaInitializationString ()
  {
    return null;
  }
}