jimageviewer.java

JavaExplorer是一个独立于平台的浏览器

/**
  * File and FTP Explorer
  * Copyright 2002
  * BOESCH Vincent
  *
  * 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 2
  * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
package javaexplorer.gui.viewer;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Image;
import javaexplorer.gui.listener.ViewerListener;
import javaexplorer.model.XFile;
import javaexplorer.util.ExplorerUtil;
import javaexplorer.util.ImageGrabber;
//import javaexplorer.util.ImageGrabber;
import javaexplorer.util.options.Options;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class JImageViewer extends JScrollPane implements Viewer {
  private ImageIcon _iconView = new ImageIcon();
  private ImageIcon _iconStore = null;
  private JPanel _jpanel = new JPanel();
  private JLabel _lblImg = new JLabel();
  private float _zoomFactor = (float)1.0;
  private XFile _xfile = null;
  /**
   *  Constructor for the JImageViewer object
   */
  public JImageViewer() {
    super();
    _jpanel.setBackground(Color.white);
    _jpanel.setLayout(new BorderLayout());
    _jpanel.add(_lblImg, BorderLayout.CENTER);
    getViewport().add(_jpanel);
  }
  /**
   *  Adds a feature to the ViewerListener
   *  attribute of the JImageViewer object
   *
   *@param  vl  The feature to be added to
   *      the ViewerListener attribute
   */
  public void addViewerListener(ViewerListener vl) {
    _lblImg.addMouseListener(vl);
  }
  /**
   *  Description of the Method
   *
   *@param  e_zoomFactor  Description of
   *      Parameter
   */
  public void applyZoom(int e_zoomFactor) {
    float _oldZoom = _zoomFactor;
    switch (e_zoomFactor) {
      case ExplorerUtil.ZOOM_FIT :
        _zoomFactor = getBestZoomFactor();
        break;
      case ExplorerUtil.ZOOM_IN :
        _zoomFactor *= Options.getOptions().getZoomFactor();
        break;
      case ExplorerUtil.ZOOM_OUT :
        _zoomFactor /= Options.getOptions().getZoomFactor();
        break;
      default :
      case ExplorerUtil.ZOOM_NO :
        _zoomFactor = (float)1.0;
        break;
    }
    if (_oldZoom != _zoomFactor) {
      refresh();
    }
  }
  public void freeRessource() {
    //Lib閞ation des ressources
    _iconStore = null;
    _iconView = null;
    System.gc();
  }
  /**
   *  Gets the File attribute of the JImageViewer
   *  object
   *
   *@return    The File value
   */
  public XFile getXFile() {
    return _xfile;
  }
  /**
   *  Gets the ImageSize attribute of the
   *  JImageViewer object
   *
   *@return    The ImageSize value
   */
  public Dimension getImageSize() {
    return new Dimension(_iconStore.getIconWidth(), _iconStore.getIconHeight());
  }
  /**
   *  Gets the imageView attribute of the
   *  JImageViewer object
   *
   *@return    The imageView value
   */
  public ImageIcon getImageView() {
    return _iconView;
  }
  /**
   *  Gets the ImageViewSize attribute of
   *  the JImageViewer object
   *
   *@return    The ImageViewSize value
   */
  public Dimension getImageViewSize() {
    return new Dimension(_iconView.getIconWidth(), _iconView.getIconHeight());
  }
  /**
   *  Gets the Info attribute of the JImageViewer
   *  object
   *
   *@return    The Info value
   */
  public String getInfo() {
    if ((_iconStore != null)) {
      return _iconStore.getDescription() + "(" + _iconStore.getIconWidth() + ", " + _iconStore.getIconHeight() + ") scaled " + (float) (_zoomFactor * (float)100) + " %";
    } else {
      return "Not Available";
    }
  }
  /**
   *  Gets the JComponent attribute of the
   *  JImageViewer object
   *
   *@return    The JComponent value
   */
  public JComponent getJComponent() {
    return this;
  }
  /**
   *  Gets the MaximumSize attribute of the
   *  JImageViewer object
   *
   *@return    The MaximumSize value
   */
  public Dimension getMaximumSize() {
    Dimension d = getImageViewSize();
    return new Dimension((int)Math.min(d.width, 400), (int)Math.min(d.height, 300));
  }
  /**
   *  Gets the MinimumSize attribute of the
   *  JImageViewer object
   *
   *@return    The MinimumSize value
   */
  public Dimension getMinimumSize() {
    return new Dimension(25, 25);
  }
  /**
   *  Gets the PreferredSize attribute of
   *  the JImageViewer object
   *
   *@return    The PreferredSize value
   */
  public Dimension getPreferredSize() {
    Dimension d = getImageViewSize();
    return new Dimension((int)Math.min(d.width, 400), (int)Math.min(d.height, 300));
  }
  /**
   *  Gets the ZoomFactor attribute of the
   *  JImageViewer object
   *
   *@return    The ZoomFactor value
   */
  public float getZoomFactor() {
    return _zoomFactor;
  }
  /**
   *  Description of the Method
   */
  public void refresh() {
    if (_iconStore != null) {
      if (_zoomFactor != (float)1) {
        _iconView.setImage(_iconStore.getImage().getScaledInstance((int) ((float)_iconStore.getIconWidth() * _zoomFactor), (int) ((float)_iconStore.getIconHeight() * _zoomFactor), Image.SCALE_FAST));
      } else {
        _iconView.setImage(_iconStore.getImage());
      }
      if (_iconView != null) {
        _lblImg.setIcon(_iconView);
        _jpanel.setSize(getImageViewSize());
        _jpanel.repaint();
        repaint();
      }
    }
  }
  public void setXFile(XFile xfile) {
  	freeRessource();
  	_iconView = new ImageIcon();
    _xfile = xfile;
    if (!_xfile.isLocal()) {
      _xfile.getLocalFile();
    }
    _iconStore = ImageGrabber.getGrabber().getImage(_xfile);
    float zoom = getBestZoomFactor();
    if (zoom != 0) {
      setZoomFactor(zoom);
    }
    refresh();
  }
  /**
   *  Sets the ZoomFactor attribute of the
   *  JImageViewer object
   *
   *@param  e_zoomFactor  The new ZoomFactor
   *      value
   */
  public void setZoomFactor(float e_zoomFactor) {
    float _oldZoom = _zoomFactor;
    if (e_zoomFactor > 0) {
      _zoomFactor = e_zoomFactor;
    }
    if (_oldZoom != _zoomFactor) {
      refresh();
    }
  }
  /**
   *  Mise en oeuvre du dimensionnement automatique lors de la preview des images
   */
  private float getBestZoomFactor() {
    Dimension d1 = getSize();
    Dimension d2 = getImageSize();
    float zoomFactor = (float)Math.min((double)d1.getWidth() / (double)d2.getWidth(), (double)d1.getHeight() / (double)d2.getHeight());
    return zoomFactor;
  }
  
  
}