| 1 | /* |
| 2 | GNU Lesser General Public License |
| 3 | |
| 4 | ImageFileChooserPreview |
| 5 | Copyright (C) 2000 Frits Jalvingh & Howard Kistler |
| 6 | |
| 7 | This library is free software; you can redistribute it and/or |
| 8 | modify it under the terms of the GNU Lesser General Public |
| 9 | License as published by the Free Software Foundation; either |
| 10 | version 2.1 of the License, or (at your option) any later version. |
| 11 | |
| 12 | This library is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | Lesser General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU Lesser General Public |
| 18 | License along with this library; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | package com.hexidec.ekit.component; |
| 23 | |
| 24 | import java.awt.Dimension; |
| 25 | import java.awt.Graphics; |
| 26 | import java.awt.Image; |
| 27 | import java.io.File; |
| 28 | import javax.swing.ImageIcon; |
| 29 | import javax.swing.JComponent; |
| 30 | import javax.swing.JFileChooser; |
| 31 | import java.beans.PropertyChangeEvent; |
| 32 | import java.beans.PropertyChangeListener; |
| 33 | |
| 34 | /** Class provides a preview window for the selected image file |
| 35 | */ |
| 36 | class ImageFileChooserPreview extends JComponent implements PropertyChangeListener |
| 37 | { |
| 38 | private static final int previewWidth = 100; |
| 39 | private static final int previewHeight = 100; |
| 40 | |
| 41 | private ImageIcon imageThumb = null; |
| 42 | private File imageFile = null; |
| 43 | |
| 44 | /** This class requires a file chooser to register with so this class will |
| 45 | * be notified when a new file is selected in the browser. |
| 46 | * @param JFileChooser that this preview window is used in. |
| 47 | */ |
| 48 | public ImageFileChooserPreview(JFileChooser parent) |
| 49 | { |
| 50 | setPreferredSize(new Dimension(previewWidth , previewHeight)); |
| 51 | parent.addPropertyChangeListener(this); |
| 52 | } |
| 53 | |
| 54 | /** Loads a new image into the preview window, and scales it if necessary. |
| 55 | */ |
| 56 | public void loadImage() |
| 57 | { |
| 58 | if(imageFile == null) |
| 59 | { |
| 60 | imageThumb = null; |
| 61 | return; |
| 62 | } |
| 63 | imageThumb = new ImageIcon(imageFile.getPath()); |
| 64 | |
| 65 | // Check if thumb requires scaling |
| 66 | if(imageThumb.getIconHeight() < previewHeight && imageThumb.getIconWidth() < previewWidth) |
| 67 | { |
| 68 | return; |
| 69 | } |
| 70 | int w = previewWidth; |
| 71 | int h = previewHeight; |
| 72 | if(imageThumb.getIconHeight() > imageThumb.getIconWidth()) |
| 73 | { |
| 74 | w = -1; |
| 75 | } |
| 76 | else |
| 77 | { |
| 78 | h = -1; |
| 79 | } |
| 80 | imageThumb = new ImageIcon(imageThumb.getImage().getScaledInstance(w, h, Image.SCALE_DEFAULT)); |
| 81 | } |
| 82 | |
| 83 | /** Callback (event handler) to indicate that a property of the |
| 84 | * JFileChooser has changed. If the selected file has changed cause a new |
| 85 | * thumbnail to load. |
| 86 | */ |
| 87 | public void propertyChange(PropertyChangeEvent e) |
| 88 | { |
| 89 | if(e.getPropertyName().equals(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)) |
| 90 | { |
| 91 | imageFile = (File)e.getNewValue(); |
| 92 | if(isShowing()) |
| 93 | { |
| 94 | loadImage(); |
| 95 | repaint(); |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /** Paints the icon of the current image, if one's present.. |
| 101 | * @param Graphics object to use when painting the component. |
| 102 | */ |
| 103 | public void paintComponent(Graphics g) |
| 104 | { |
| 105 | if(imageThumb == null) |
| 106 | { |
| 107 | loadImage(); |
| 108 | } |
| 109 | if(imageThumb == null) |
| 110 | { |
| 111 | return; |
| 112 | } |
| 113 | int x = (getWidth() - imageThumb.getIconWidth()) / 2; |
| 114 | int y = (getHeight() - imageThumb.getIconHeight()) / 2; |
| 115 | if(y < 0) |
| 116 | { |
| 117 | y = 0; |
| 118 | } |
| 119 | if(x < 5) |
| 120 | { |
| 121 | x = 5; |
| 122 | } |
| 123 | imageThumb.paintIcon(this, g, x, y); |
| 124 | } |
| 125 | } |
| 126 | |