Initial revision

[old-projects.git] / ekit / com / hexidec / ekit / component / ImageFileChooserPreview.java

/*\r
GNU Lesser General Public License\r
\r
ImageFileChooserPreview\r
Copyright (C) 2000-2002  Frits Jalvingh & Howard Kistler\r
\r
This library is free software; you can redistribute it and/or\r
modify it under the terms of the GNU Lesser General Public\r
License as published by the Free Software Foundation; either\r
version 2.1 of the License, or (at your option) any later version.\r
\r
This library is distributed in the hope that it will be useful,\r
but WITHOUT ANY WARRANTY; without even the implied warranty of\r
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\r
Lesser General Public License for more details.\r
\r
You should have received a copy of the GNU Lesser General Public\r
License along with this library; if not, write to the Free Software\r
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
*/\r
\r
package com.hexidec.ekit.component;\r
\r
import java.awt.Dimension;\r
import java.awt.Graphics;\r
import java.awt.Image;\r
import java.io.File;\r
import javax.swing.ImageIcon;\r
import javax.swing.JComponent;\r
import javax.swing.JFileChooser;\r
import java.beans.PropertyChangeEvent;\r
import java.beans.PropertyChangeListener;\r
\r
/** Class provides a preview window for the selected image file\r
  */\r
class ImageFileChooserPreview extends JComponent implements PropertyChangeListener\r
{\r
	private static final int previewWidth  = 100;\r
	private static final int previewHeight = 100;\r
\r
	private ImageIcon imageThumb = null;\r
	private File imageFile = null;\r
\r
	/** This class requires a file chooser to register with so this class will\r
	  * be notified when a new file is selected in the browser.\r
	  * @param JFileChooser that this preview window is used in.\r
	  */\r
	public ImageFileChooserPreview(JFileChooser parent)\r
	{\r
		setPreferredSize(new Dimension(previewWidth , previewHeight));\r
		parent.addPropertyChangeListener(this);\r
	}\r
\r
	/** Loads a new image into the preview window, and scales it if necessary.\r
	  */\r
	public void loadImage()\r
	{\r
		if(imageFile == null)\r
		{\r
			imageThumb = null;\r
			return;\r
		}\r
		imageThumb = new ImageIcon(imageFile.getPath());\r
\r
		// Check if thumb requires scaling\r
		if(imageThumb.getIconHeight() < previewHeight && imageThumb.getIconWidth() < previewWidth)\r
		{\r
			return;\r
		}\r
		int	w = previewWidth;\r
		int	h = previewHeight;\r
		if(imageThumb.getIconHeight() > imageThumb.getIconWidth())\r
		{\r
			w = -1;\r
		}\r
		else\r
		{\r
			h = -1;\r
		}\r
		imageThumb = new ImageIcon(imageThumb.getImage().getScaledInstance(w, h, Image.SCALE_DEFAULT));\r
	}\r
\r
	/** Callback (event handler) to indicate that a property of the\r
	  * JFileChooser has changed. If the selected file has changed cause a new\r
	  * thumbnail to load.\r
	  */\r
	public void propertyChange(PropertyChangeEvent e)\r
	{\r
		if(e.getPropertyName().equals(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY))\r
		{\r
			imageFile = (File)e.getNewValue();\r
			if(isShowing())\r
			{\r
				loadImage();\r
				repaint();\r
			}\r
		}\r
	}\r
\r
	/** Paints the icon of the current image, if one's present..\r
	  * @param Graphics object to use when painting the component.\r
	  */\r
	public void paintComponent(Graphics g)\r
	{\r
		if(imageThumb == null)\r
		{\r
			loadImage();\r
		}\r
		if(imageThumb == null)\r
		{\r
			return;\r
		}\r
		int	x = (getWidth() - imageThumb.getIconWidth()) / 2;\r
		int	y = (getHeight() - imageThumb.getIconHeight()) / 2;\r
		if(y < 0)\r
		{\r
			y = 0;\r
		}\r
		if(x < 5)\r
		{\r
			x = 5;\r
		}\r
		imageThumb.paintIcon(this, g, x, y);\r
	}\r
}\r
\r