FileChooserDemopublic class FileChooserDemo extends JPanel implements ActionListener| A demo which makes extensive use of the file chooser.
1.22 01/23/03 |
| Fields Summary |
|---|
| static JFrame | frame | | static String | metal | | static String | metalClassName | | static String | motif | | static String | motifClassName | | static String | windows | | static String | windowsClassName | | JButton | showButton | | JCheckBox | showAllFilesFilterCheckBox | | JCheckBox | showImageFilesFilterCheckBox | | JCheckBox | showFullDescriptionCheckBox | | JCheckBox | useFileViewCheckBox | | JCheckBox | accessoryCheckBox | | JCheckBox | setHiddenCheckBox | | JCheckBox | useControlsCheckBox | | JRadioButton | singleSelectionRadioButton | | JRadioButton | multiSelectionRadioButton | | JRadioButton | openRadioButton | | JRadioButton | saveRadioButton | | JRadioButton | customButton | | JRadioButton | metalRadioButton | | JRadioButton | motifRadioButton | | JRadioButton | windowsRadioButton | | JRadioButton | justFilesRadioButton | | JRadioButton | justDirectoriesRadioButton | | JRadioButton | bothFilesAndDirectoriesRadioButton | | JTextField | customField | | ExampleFileFilter | jpgFilter | | ExampleFileFilter | gifFilter | | ExampleFileFilter | bothFilter | | ExampleFileView | fileView | | JPanel | buttonPanel | | public static final Dimension | hpad10 | | public static final Dimension | vpad20 | | public static final Dimension | vpad7 | | public static final Dimension | vpad4 | | public static final Insets | insets | | FilePreviewer | previewer | | JFileChooser | chooser |
| Constructors Summary |
|---|
public FileChooserDemo()
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
chooser = new JFileChooser();
previewer = new FilePreviewer(chooser);
// Create Filters
jpgFilter = new ExampleFileFilter("jpg", "JPEG Compressed Image Files");
gifFilter = new ExampleFileFilter("gif", "GIF Image Files");
bothFilter = new ExampleFileFilter(new String[] {"jpg", "gif"}, "JPEG and GIF Image Files");
// Create Custom FileView
fileView = new ExampleFileView();
fileView.putIcon("jpg", new ImageIcon("images/jpgIcon.jpg"));
fileView.putIcon("gif", new ImageIcon("images/gifIcon.gif"));
// create a radio listener to listen to option changes
OptionListener optionListener = new OptionListener();
// Create options
openRadioButton = new JRadioButton("Open");
openRadioButton.setSelected(true);
openRadioButton.addActionListener(optionListener);
saveRadioButton = new JRadioButton("Save");
saveRadioButton.addActionListener(optionListener);
customButton = new JRadioButton("Custom");
customButton.addActionListener(optionListener);
customField = new JTextField(8) {
public Dimension getMaximumSize() {
return new Dimension(getPreferredSize().width, getPreferredSize().height);
}
};
customField.setText("Doit");
customField.setAlignmentY(JComponent.TOP_ALIGNMENT);
customField.setEnabled(false);
customField.addActionListener(optionListener);
ButtonGroup group1 = new ButtonGroup();
group1.add(openRadioButton);
group1.add(saveRadioButton);
group1.add(customButton);
// filter buttons
showAllFilesFilterCheckBox = new JCheckBox("Show \"All Files\" Filter");
showAllFilesFilterCheckBox.addActionListener(optionListener);
showAllFilesFilterCheckBox.setSelected(true);
showImageFilesFilterCheckBox = new JCheckBox("Show JPG and GIF Filters");
showImageFilesFilterCheckBox.addActionListener(optionListener);
showImageFilesFilterCheckBox.setSelected(false);
accessoryCheckBox = new JCheckBox("Show Preview");
accessoryCheckBox.addActionListener(optionListener);
accessoryCheckBox.setSelected(false);
// more options
setHiddenCheckBox = new JCheckBox("Show Hidden Files");
setHiddenCheckBox.addActionListener(optionListener);
showFullDescriptionCheckBox = new JCheckBox("With File Extensions");
showFullDescriptionCheckBox.addActionListener(optionListener);
showFullDescriptionCheckBox.setSelected(true);
showFullDescriptionCheckBox.setEnabled(false);
useFileViewCheckBox = new JCheckBox("Use FileView");
useFileViewCheckBox.addActionListener(optionListener);
useFileViewCheckBox.setSelected(false);
useControlsCheckBox = new JCheckBox("Show Control Buttons");
useControlsCheckBox.addActionListener(optionListener);
useControlsCheckBox.setSelected(true);
// File or Directory chooser options
ButtonGroup group3 = new ButtonGroup();
justFilesRadioButton = new JRadioButton("Just Select Files");
justFilesRadioButton.setSelected(true);
group3.add(justFilesRadioButton);
justFilesRadioButton.addActionListener(optionListener);
justDirectoriesRadioButton = new JRadioButton("Just Select Directories");
group3.add(justDirectoriesRadioButton);
justDirectoriesRadioButton.addActionListener(optionListener);
bothFilesAndDirectoriesRadioButton = new JRadioButton("Select Files or Directories");
group3.add(bothFilesAndDirectoriesRadioButton);
bothFilesAndDirectoriesRadioButton.addActionListener(optionListener);
singleSelectionRadioButton = new JRadioButton("Single Selection", true);
singleSelectionRadioButton.addActionListener(optionListener);
multiSelectionRadioButton = new JRadioButton("Multi Selection");
multiSelectionRadioButton.addActionListener(optionListener);
ButtonGroup group4 = new ButtonGroup();
group4.add(singleSelectionRadioButton);
group4.add(multiSelectionRadioButton);
// Create show button
showButton = new JButton("Show FileChooser");
showButton.addActionListener(this);
showButton.setMnemonic('s");
// Create laf buttons.
metalRadioButton = new JRadioButton(metal);
metalRadioButton.setMnemonic('m");
metalRadioButton.setActionCommand(metalClassName);
metalRadioButton.setEnabled(isAvailableLookAndFeel(metalClassName));
motifRadioButton = new JRadioButton(motif);
motifRadioButton.setMnemonic('o");
motifRadioButton.setActionCommand(motifClassName);
motifRadioButton.setEnabled(isAvailableLookAndFeel(motifClassName));
windowsRadioButton = new JRadioButton(windows);
windowsRadioButton.setMnemonic('w");
windowsRadioButton.setActionCommand(windowsClassName);
windowsRadioButton.setEnabled(isAvailableLookAndFeel(windowsClassName));
ButtonGroup group5 = new ButtonGroup();
group5.add(metalRadioButton);
group5.add(motifRadioButton);
group5.add(windowsRadioButton);
// Register a listener for the laf buttons.
metalRadioButton.addActionListener(optionListener);
motifRadioButton.addActionListener(optionListener);
windowsRadioButton.addActionListener(optionListener);
// ********************************************************
// ******************** Dialog Type ***********************
// ********************************************************
JPanel control1 = new InsetPanel(insets);
control1.setBorder(BorderFactory.createTitledBorder("Dialog Type"));
control1.setLayout(new BoxLayout(control1, BoxLayout.Y_AXIS));
control1.add(Box.createRigidArea(vpad20));
control1.add(openRadioButton);
control1.add(Box.createRigidArea(vpad7));
control1.add(saveRadioButton);
control1.add(Box.createRigidArea(vpad7));
control1.add(customButton);
control1.add(Box.createRigidArea(vpad4));
JPanel fieldWrapper = new JPanel();
fieldWrapper.setLayout(new BoxLayout(fieldWrapper, BoxLayout.X_AXIS));
fieldWrapper.setAlignmentX(Component.LEFT_ALIGNMENT);
fieldWrapper.add(Box.createRigidArea(hpad10));
fieldWrapper.add(Box.createRigidArea(hpad10));
fieldWrapper.add(customField);
control1.add(fieldWrapper);
control1.add(Box.createRigidArea(vpad20));
control1.add(Box.createGlue());
// ********************************************************
// ***************** Filter Controls **********************
// ********************************************************
JPanel control2 = new InsetPanel(insets);
control2.setBorder(BorderFactory.createTitledBorder("Filter Controls"));
control2.setLayout(new BoxLayout(control2, BoxLayout.Y_AXIS));
control2.add(Box.createRigidArea(vpad20));
control2.add(showAllFilesFilterCheckBox);
control2.add(Box.createRigidArea(vpad7));
control2.add(showImageFilesFilterCheckBox);
control2.add(Box.createRigidArea(vpad4));
JPanel checkWrapper = new JPanel();
checkWrapper.setLayout(new BoxLayout(checkWrapper, BoxLayout.X_AXIS));
checkWrapper.setAlignmentX(Component.LEFT_ALIGNMENT);
checkWrapper.add(Box.createRigidArea(hpad10));
checkWrapper.add(Box.createRigidArea(hpad10));
checkWrapper.add(showFullDescriptionCheckBox);
control2.add(checkWrapper);
control2.add(Box.createRigidArea(vpad20));
control2.add(Box.createGlue());
// ********************************************************
// ****************** Display Options *********************
// ********************************************************
JPanel control3 = new InsetPanel(insets);
control3.setBorder(BorderFactory.createTitledBorder("Display Options"));
control3.setLayout(new BoxLayout(control3, BoxLayout.Y_AXIS));
control3.add(Box.createRigidArea(vpad20));
control3.add(setHiddenCheckBox);
control3.add(Box.createRigidArea(vpad7));
control3.add(useFileViewCheckBox);
control3.add(Box.createRigidArea(vpad7));
control3.add(accessoryCheckBox);
control3.add(Box.createRigidArea(vpad7));
control3.add(useControlsCheckBox);
control3.add(Box.createRigidArea(vpad20));
control3.add(Box.createGlue());
// ********************************************************
// ************* File & Directory Options *****************
// ********************************************************
JPanel control4 = new InsetPanel(insets);
control4.setBorder(BorderFactory.createTitledBorder("File and Directory Options"));
control4.setLayout(new BoxLayout(control4, BoxLayout.Y_AXIS));
control4.add(Box.createRigidArea(vpad20));
control4.add(justFilesRadioButton);
control4.add(Box.createRigidArea(vpad7));
control4.add(justDirectoriesRadioButton);
control4.add(Box.createRigidArea(vpad7));
control4.add(bothFilesAndDirectoriesRadioButton);
control4.add(Box.createRigidArea(vpad20));
control4.add(singleSelectionRadioButton);
control4.add(Box.createRigidArea(vpad7));
control4.add(multiSelectionRadioButton);
control4.add(Box.createRigidArea(vpad20));
control4.add(Box.createGlue());
// ********************************************************
// **************** Look & Feel Switch ********************
// ********************************************************
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
panel.add(Box.createRigidArea(hpad10));
panel.add(metalRadioButton);
panel.add(Box.createRigidArea(hpad10));
panel.add(motifRadioButton);
panel.add(Box.createRigidArea(hpad10));
panel.add(windowsRadioButton);
panel.add(Box.createRigidArea(hpad10));
panel.add(showButton);
panel.add(Box.createRigidArea(hpad10));
// ********************************************************
// ****************** Wrap 'em all up *********************
// ********************************************************
JPanel wrapper = new JPanel();
wrapper.setLayout(new BoxLayout(wrapper, BoxLayout.X_AXIS));
add(Box.createRigidArea(vpad20));
wrapper.add(Box.createRigidArea(hpad10));
wrapper.add(Box.createRigidArea(hpad10));
wrapper.add(control1);
wrapper.add(Box.createRigidArea(hpad10));
wrapper.add(control2);
wrapper.add(Box.createRigidArea(hpad10));
wrapper.add(control3);
wrapper.add(Box.createRigidArea(hpad10));
wrapper.add(control4);
wrapper.add(Box.createRigidArea(hpad10));
wrapper.add(Box.createRigidArea(hpad10));
add(wrapper);
add(Box.createRigidArea(vpad20));
add(panel);
add(Box.createRigidArea(vpad20));
|
| Methods Summary |
|---|
| public void | actionPerformed(java.awt.event.ActionEvent e)
if (chooser.isMultiSelectionEnabled()) {
chooser.setSelectedFiles(null);
} else {
chooser.setSelectedFile(null);
}
// clear the preview from the previous display of the chooser
JComponent accessory = chooser.getAccessory();
if (accessory != null) {
((FilePreviewer)accessory).loadImage(null);
}
int retval = chooser.showDialog(frame, null);
if (retval == JFileChooser.APPROVE_OPTION) {
if (chooser.isMultiSelectionEnabled()) {
File [] files = chooser.getSelectedFiles();
if (files != null && files.length > 0) {
String filenames = "";
for (int i = 0; i < files.length; i++) {
filenames = filenames + "\n" + files[i].getPath();
}
JOptionPane.showMessageDialog(frame,
"You chose these files: \n" + filenames);
}
} else {
File theFile = chooser.getSelectedFile();
if (theFile != null) {
if (theFile.isDirectory()) {
JOptionPane.showMessageDialog(frame,
"You chose this directory: " +
theFile.getPath());
} else {
JOptionPane.showMessageDialog(frame,
"You chose this file: " +
theFile.getPath());
}
}
}
} else if (retval == JFileChooser.CANCEL_OPTION) {
JOptionPane.showMessageDialog(frame, "User cancelled operation. No file was chosen.");
} else if (retval == JFileChooser.ERROR_OPTION) {
JOptionPane.showMessageDialog(frame, "An error occured. No file was chosen.");
} else {
JOptionPane.showMessageDialog(frame, "Unknown operation occured.");
}
| | protected boolean | isAvailableLookAndFeel(java.lang.String laf)A utility function that layers on top of the LookAndFeel's
isSupportedLookAndFeel() method. Returns true if the LookAndFeel
is supported. Returns false if the LookAndFeel is not supported
and/or if there is any kind of error checking if the LookAndFeel
is supported.
The L&F menu will use this method to detemine whether the various
L&F options should be active or inactive.
try {
Class lnfClass = Class.forName(laf);
LookAndFeel newLAF = (LookAndFeel)(lnfClass.newInstance());
return newLAF.isSupportedLookAndFeel();
} catch (Exception e) { // If ANYTHING weird happens, return false
return false;
}
| | public static void | main(java.lang.String[] s)
/*
NOTE: By default, the look and feel will be set to the
Cross Platform Look and Feel (which is currently Metal).
The user may someday be able to override the default
via a system property. If you as the developer want to
be sure that a particular L&F is set, you can do so
by calling UIManager.setLookAndFeel(). For example, the
first code snippet below forcibly sets the UI to be the
System Look and Feel. The second code snippet forcibly
sets the look and feel to the Cross Platform L&F.
Snippet 1:
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception exc) {
System.err.println("Error loading L&F: " + exc);
}
Snippet 2:
try {
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
} catch (Exception exc) {
System.err.println("Error loading L&F: " + exc);
}
*/
try {
// UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
} catch (Exception exc) {
System.err.println("Error loading L&F: " + exc);
}
FileChooserDemo panel = new FileChooserDemo();
frame = new JFrame("FileChooserDemo");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
frame.getContentPane().add("Center", panel);
frame.pack();
frame.setVisible(true);
panel.updateState();
| | public void | updateState()
String lnfName = UIManager.getLookAndFeel().getClass().getName();
if (lnfName.indexOf(metal) >= 0) {
metalRadioButton.setSelected(true);
} else if (lnfName.indexOf(windows) >= 0) {
windowsRadioButton.setSelected(true);
} else if (lnfName.indexOf(motif) >= 0) {
motifRadioButton.setSelected(true);
} else {
System.err.println("FileChooserDemo if using an unknown L&F: " + lnfName);
}
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