reportbandeditor.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.
 *
 * ------------------------------
 * ReportEditor.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: ReportBandEditor.java,v 1.3 2004/04/20 18:54:57 taqua Exp $
 *
 * Changes
 * -------------------------
 * 28.09.2003 : Initial version
 *
 */

package org.jfree.designer.visualeditor.bandeditor;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import javax.swing.CellRendererPane;
import javax.swing.JComponent;
import javax.swing.RepaintManager;
import javax.swing.SwingUtilities;
import javax.swing.border.TitledBorder;
import javax.swing.event.MouseInputAdapter;

import org.jfree.report.Band;
import org.jfree.report.Element;
import org.jfree.report.layout.BandLayoutManagerUtil;
import org.jfree.report.layout.DefaultLayoutSupport;
import org.jfree.report.layout.StaticLayoutManager;

public final class ReportBandEditor
        extends JComponent
{
  private final class ReportSelectionHandler
          implements ReportSelectionListener
  {
    public ReportSelectionHandler ()
    {
    }

    public final void selectionChanged (final ReportSelectionEvent event)
    {
      repaint();
    }
  }

  /**
   * This class will handle all mouse events.
   * <p/>
   * Multiple elements can be selected by pressing the shift key. If shift is not pressed,
   * clicking on one element will clear the selection and select that element. Clicking
   * outside of an element will just clear the selection.
   * <p/>
   * If the selection did not change, the click (mouse down) may start an drag event.
   */
  private final class MouseHandler
          extends MouseInputAdapter
  {
    private int orgX;
    private int orgY;
    // the elements for the drag operation ...
    private Element[] selectedElements;
    private float[] selectedElementsPosX;
    private float[] selectedElementsPosY;

    public MouseHandler ()
    {
    }

    /**
     * Invoked when a mouse button is pressed on a component and then dragged.  Mouse drag
     * events will continue to be delivered to the component where the first originated
     * until the mouse button is released (regardless of whether the mouse position is
     * within the bounds of the component).
     */
    public final void mouseDragged (final MouseEvent e)
    {
      if (selectedElements == null)
      {
        return;
      }
      if (SwingUtilities.isLeftMouseButton(e) == false)
      {
        return;
      }
      final int y = e.getY();
      if (y < 0)
      {
        //Log.debug ("Mouse Drag: " + getBounds() + " " + e.getPoint());
        return;
      }
      final int x = e.getX();
      if (x < 0)
      {
        //Log.debug ("Mouse Drag: " + getBounds() + " " + e.getPoint());
        return;
      }

      // if zoomed, then our coordinate system would not fit the display sizes
      final float deltaX = (x - orgX) / getDetailLevel();
      final float deltaY = (y - orgY) / getDetailLevel();

      if (deltaX == 0 && deltaY == 0)
      {
        return;
      }
      for (int i = 0; i < selectedElements.length; i++)
      {
        // ignore drag events for relative sizes for now.
        final float selectedX = selectedElementsPosX[i];
        final float selectedY = selectedElementsPosY[i];
        if (selectedX < 0 || selectedY < 0)
        {
          continue;
        }
        final float targetX = selectedX + deltaX;
        final float targetY = selectedY + deltaY;
        if (targetX < 0 || targetY < 0)
        {
          continue;
        }
        final Point2D target = new Point2D.Double(targetX, targetY);
        selectedElements[i].getStyle().setStyleProperty
                (StaticLayoutManager.ABSOLUTE_POS, target);
      }
      // force layouting
      revalidate();
      repaint();
    }

    // implements java.awt.event.MouseListener
    public final void mousePressed (final MouseEvent e)
    {
      if (SwingUtilities.isLeftMouseButton(e) == false)
      {
        return;
      }

      if (selectionModel.getSelectionCount() == 0)
      {
        selectedElements = null;
      }

      final Insets in = getInsets();
      final Element element = getElementForLocation(e.getX() - in.right, e.getY() - in.top);
      if (element == null)
      {
        if (e.isShiftDown() == false)
        {
          selectionModel.clearSelection();
        }
        // the selection is cleared, there is nothing more to do ...

        // complete the event handling of mousePressed ...
        // repaint();
        return;
      }
      if (selectionModel.isSelected(element))
      {
        if (e.isShiftDown())
        {
          // remove that one element ...
          selectionModel.removeSelection(element);
          // in that case do not handle any drag event

          // complete the event handling of mousePressed ...
          // repaint();
          return;
        }
      }
      else
      {
        if (e.isShiftDown() == false)
        {
          selectionModel.clearSelection();
        }
        selectionModel.addSelection(element);
        // selection changed, so do not handle any drag event

        // complete the event handling of mousePressed ...
        // repaint();
      }

      // at this point we can tell, that we have at least one selected element

      orgX = e.getX();
      orgY = e.getY();

      // move elements ... currently only for absolutelayout
      selectedElements = selectionModel.getSelectedElements();
      selectedElementsPosX = new float[selectedElements.length];
      selectedElementsPosY = new float[selectedElements.length];

      for (int i = 0; i < selectedElements.length; i++)
      {
        final Point2D point = (Point2D) selectedElements[i].getStyle().getStyleProperty
                (StaticLayoutManager.ABSOLUTE_POS);
        if (point == null)
        {
          selectedElementsPosX[i] = 0;
          selectedElementsPosY[i] = 0;
        }
        else
        {
          selectedElementsPosX[i] = (float) point.getX();
          selectedElementsPosY[i] = (float) point.getY();
        }
      }
    }
  }

  private Band band;
  private String title;
  private float width;
  private float detailLevel;
  private ElementRenderer renderer;
  private CellRendererPane cellRendererPane;
  private ReportDefinitionSelectionModel selectionModel;
  private Dimension cachedRenderingSize;
  private ReportSelectionHandler reportSelectionHandler;

  public ReportBandEditor (final String title, final Band band, final float width)
  {
    // we don't have a layout manager.
    cellRendererPane = new CellRendererPane();
    this.detailLevel = 1;
    this.band = band;
    this.title = title;
    this.width = width;
    this.renderer = new DefaultElementRenderer();
    this.selectionModel = new ReportDefinitionSelectionModel();
    this.reportSelectionHandler = new ReportSelectionHandler();
    this.selectionModel.addReportSelectionListener(reportSelectionHandler);
    setLayout(null);
    setBorder(new TitledBorder(title));
    setDoubleBuffered(false);
    final MouseHandler mh = new MouseHandler();
    addMouseListener(mh);
    addMouseMotionListener(mh);
  }

  public final ElementRenderer getRenderer ()