Collected from: http://sheikyerbouti.developpez.com/ImageFileChooser/ImageFileChooser.htm
1. Purpose
When you want to load images from
the client machine to the database, you would like
to choose the right image file
with a preview of each image.
This is a Javabean component that
allows to display a JfileChooser dialog box with image preview.
It also allows to display at the
same time different file types.
2. The Javabean
package oracle.forms.fd;
import javax.swing.*;
import
java.beans.*;
import
java.awt.*;
import
java.io.File;
import
java.util.Hashtable;
import java.util.Enumeration;
import javax.swing.filechooser.*;
/**
* A
javabean to display an Open-dialog bow with image preview
*
*
@version 1.0
*
@date 20-oct-2005
* @author Francois Degrelle
*/
public class GetImageFileName extends Component
{
public
GetImageFileName()
{
super();
/*
try
{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
}
catch (Exception ex)
{
ex.printStackTrace();
}
*/
}
/**
*
method to display the OpenFile dialog.
*
*
@param the title for the dialog
*
@param the starting directory
*
@return the selected file name (or null)
*/
public String
GetFile(String dialogTitle, String startDirectory)
{
String
sFileName = "" ;
Filters.setTitle( dialogTitle ) ;
Filters.setDir( startDirectory ) ;
sFileName =
Filters.Start() ;
return
sFileName ;
}
}
/**
*
class that handle the JFileChooser
*/
class Filters extends JLabel implements
PropertyChangeListener {
private
static final int ICON_WIDTH = 100;
private
static final int ICON_HEIGHT = 100;
private
static String fileName = "" ;
private
static String sTitle = ""
;
private
static String startDir = "." ;
// Set the dialog box title
public
static void setTitle( String title )
{
sTitle =
title ;
}
// Set the start directory
public
static void setDir( String directory )
{
startDir
= directory ;
}
// Add the image previewer to the dialog box
public
Filters(JFileChooser chooser) {
setVerticalAlignment(JLabel.CENTER);
setHorizontalAlignment(JLabel.CENTER);
chooser.addPropertyChangeListener(this);
setPreferredSize(new Dimension (ICON_WIDTH, ICON_HEIGHT));
}
public
void propertyChange(
PropertyChangeEvent changeEvent) {
String
changeName = changeEvent.getPropertyName();
if
(changeName.equals
(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)) {
File file = (File)changeEvent.getNewValue();
if (file != null) {
ImageIcon icon = new
ImageIcon(file.getPath());
if (icon.getIconWidth() > ICON_WIDTH) {
icon = new ImageIcon(
icon.getImage().getScaledInstance(ICON_WIDTH, -1, Image.SCALE_DEFAULT));
if (icon.getIconHeight() > ICON_HEIGHT) {
icon = new ImageIcon(
icon.getImage().getScaledInstance(-1,
ICON_HEIGHT, Image.SCALE_DEFAULT));
}
}
setIcon(icon);
}
}
}
public
static String Start() {
JFileChooser fileChooser = new JFileChooser(startDir);
LabelAccessory accessory = new LabelAccessory(fileChooser);
fileChooser.setDialogTitle(sTitle);
// Set the filter
ExampleFileFilter filter = new ExampleFileFilter("jpg");
filter.addExtension("gif");
filter.setDescription("Jpeg & Gif Files");
fileChooser.addChoosableFileFilter(filter);
fileChooser.setAccessory(accessory);
fileChooser.addPropertyChangeListener
(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY, accessory);
int
status = fileChooser.showOpenDialog(null);
if (status ==
JFileChooser.APPROVE_OPTION) {
File selectedFile = fileChooser.getSelectedFile();
fileName = selectedFile.getParent() + selectedFile.separator +
selectedFile.getName() ;
// Output of selected filename
System.out.println("filename= "+fileName);
}
return
fileName ;
}
public
static class LabelAccessory extends JLabel implements PropertyChangeListener {
private
static final int ICON_WIDTH = 100;
private
static final int ICON_HEIGHT = 100;
public
LabelAccessory(JFileChooser chooser) {
setVerticalAlignment(JLabel.CENTER);
setHorizontalAlignment(JLabel.CENTER);
chooser.addPropertyChangeListener(this);
setPreferredSize(new Dimension(ICON_WIDTH, ICON_HEIGHT));
}
public
void propertyChange(
PropertyChangeEvent changeEvent) {
String
changeName = changeEvent.getPropertyName();
if
(changeName.equals(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)) {
File file = (File)changeEvent.getNewValue();
if (file != null) {
ImageIcon icon = new
ImageIcon(file.getPath());
if (icon.getIconWidth() > ICON_WIDTH) {
icon = new
ImageIcon(icon.getImage().getScaledInstance(ICON_WIDTH, -1,
Image.SCALE_DEFAULT));
if (icon.getIconHeight() > ICON_HEIGHT) {
icon = new ImageIcon(icon.getImage().getScaledInstance(-1,
ICON_HEIGHT, Image.SCALE_DEFAULT));
}
}
setIcon(icon);
}
}
}
}
/**
* A
convenience implementation of FileFilter that filters out
* all
files except for those type extensions that it knows about.
*
*
Extensions are of the type ".foo", which is typically found on
*
Windows and Unix boxes, but not on Macinthosh. Case is ignored.
*
*
Example - create a new filter that filerts out all files
*
but gif and jpg image files:
*
* JFileChooser chooser
= new JFileChooser();
* ExampleFileFilter
filter = new ExampleFileFilter(
* new
String{"gif", "jpg"}, "JPEG & GIF Images")
*
chooser.addChoosableFileFilter(filter);
*
chooser.showOpenDialog(this);
*
*
@version 1.9 04/23/99
*
@author Jeff Dinkins
*/
public static class ExampleFileFilter extends
FileFilter {
private
String TYPE_UNKNOWN = "Type Unknown";
private
String HIDDEN_FILE = "Hidden File";
private
Hashtable filters = null;
private
String description = null;
private
String fullDescription = null;
private
boolean useExtensionsInDescription = true;
/**
* Creates a file filter. If no filters are added, then all
* files are accepted.
*
* @see #addExtension
*/
public
ExampleFileFilter() {
this.filters = new Hashtable();
}
/**
* Creates a file filter that accepts files with the given extension.
* Example: new ExampleFileFilter("jpg");
*
* @see #addExtension
*/
public
ExampleFileFilter(String extension) {
this(extension,null);
}
/**
* Creates a file filter that accepts the given file type.
* Example: new ExampleFileFilter("jpg", "JPEG Image
Images");
*
* Note that the "." before the extension is not needed. If
* provided, it will be ignored.
*
* @see #addExtension
*/
public ExampleFileFilter(String
extension, String description) {
this();
if(extension!=null) addExtension(extension);
if(description!=null) setDescription(description);
}
/**
* Creates a file filter from the given string array.
* Example: new ExampleFileFilter(String {"gif",
"jpg"});
*
* Note that the "." before the extension is not needed adn
* will be ignored.
*
* @see #addExtension
*/
public
ExampleFileFilter(String[] filters) {
this(filters, null);
}
/**
* Creates a file filter from the given string array and description.
* Example: new ExampleFileFilter(String {"gif",
"jpg"}, "Gif and JPG Images");
*
* Note that the "." before the extension is not needed and
will be ignored.
*
* @see #addExtension
*/
public
ExampleFileFilter(String[] filters, String description) {
this();
for
(int i = 0; i < filters.length; i++) {
// add filters one by one
addExtension(filters[i]);
}
if(description!=null) setDescription(description);
}
/**
* Return true if this file should be shown in the directory pane,
* false if it shouldn't.
*
* Files that begin with "." are ignored.
*
* @see #getExtension
* @see FileFilter#accepts
*/
public
boolean accept(File f) {
if(f !=
null) {
if(f.isDirectory()) {
return true;
}
String extension = getExtension(f);
if(extension != null && filters.get(getExtension(f)) != null) {
return true;
};
}
return
false;
}
/**
* Return the extension portion of the file's name .
*
* @see #getExtension
* @see FileFilter#accept
*/
public
String getExtension(File f) {
if(f !=
null) {
String filename = f.getName();
int
i = filename.lastIndexOf('.');
if(i>0 && i<filename.length()-1) {
return filename.substring(i+1).toLowerCase();
};
}
return
null;
}
/**
* Adds a filetype "dot" extension to filter against.
*
* For example: the following code will create a filter that filters
* out all files except those that end in ".jpg" and
".tif":
*
* ExampleFileFilter filter =
new ExampleFileFilter();
*
filter.addExtension("jpg");
* filter.addExtension("tif");
*
* Note that the "." before the extension is not needed and
will be ignored.
*/
public void
addExtension(String extension) {
if(filters == null) {
filters = new Hashtable(5);
}
filters.put(extension.toLowerCase(),
this);
fullDescription = null;
}
/**
* Returns the human readable description of this filter. For
* example: "JPEG and GIF Image Files (*.jpg, *.gif)"
*
* @see setDescription
* @see setExtensionListInDescription
* @see isExtensionListInDescription
* @see FileFilter#getDescription
*/
public
String getDescription() {
if(fullDescription == null) {
if(description == null || isExtensionListInDescription()) {
fullDescription = description==null ? "(" : description +
" (";
// build the description from the extension
list
Enumeration extensions = filters.keys();
if(extensions != null) {
fullDescription += "." + (String) extensions.nextElement();
while (extensions.hasMoreElements()) {
fullDescription += ", " +
(String) extensions.nextElement();
}
}
fullDescription += ")";
}
else {
fullDescription = description;
}
}
return
fullDescription;
}
/**
* Sets the human readable description of this filter. For
* example: filter.setDescription("Gif and JPG Images");
*
* @see setDescription
* @see setExtensionListInDescription
* @see isExtensionListInDescription
*/
public void
setDescription(String description) {
this.description = description;
fullDescription = null;
}
/**
* Determines whether the extension list (.jpg, .gif, etc) should
* show up in the human readable description.
*
* Only relevent if a description was
provided in the constructor
* or using setDescription();
*
* @see getDescription
* @see setDescription
* @see isExtensionListInDescription
*/
public void
setExtensionListInDescription(boolean b) {
useExtensionsInDescription = b;
fullDescription = null;
}
/**
* Returns whether the extension list (.jpg, .gif, etc) should
* show up in the human readable description.
*
* Only relevent if a description was provided in the constructor
* or using setDescription();
*
* @see getDescription
* @see setDescription
* @see setExtensionListInDescription
*/
public
boolean isExtensionListInDescription() {
return
useExtensionsInDescription;
}
}
}
3. Forms configuration
Ø Copy the GetImageFileName.jar
file in the /forms/java directory
Ø Edit the /forms/server/formsweb.cfg
file to add the jar file to the archive_jini variable
archive_jini=f90all_jinit.jar,……,
GetImageFileName.jar
4. How to implement this bean in your own form
Ø Open your form
Ø Add a Javabean
component to any block
Ø Register the bean
(be sure that it is not in a When-New-Form-Instance trigger, or use a timer)
FBean.Register_Bean('BLOCK.BEAN_ITEM',1,'oracle.forms.fd.GetImageFileName');
5. Invoke the bean’s GetFile() function
Ø The background color of the button
CHAR :=
FBean.Invoke_char('BLOCK.BEAN_ITEM',1,'GetFile','"Dialog box
title","start directory"');
e.g.
:BL1.File :=
FBean.Invoke_char('BL1.IMAGEPICKER',1,'GetFile','"Select an image file
name","M:\"');
6. The sample dialog
Ø Unzip the imagefilechooser.zip
file
Ø Copy the
GetImageFileName.jar file in your /forms/java/ directory
Ø Edit your /forms/server/formsweb.cfg
file
Ø Open the IMAGEFILECHOOSER.fmb
module (Oracle Forms 9.0.2)
Ø Compile all and
run the module
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