JFont Chooser : Font Chooser « Swing Components « Java
JFont Chooser
// revised from greef ui
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;
import java.awt.Insets;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.Serializable;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.KeyStroke;
import javax.swing.ListSelectionModel;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.EventListenerList;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
/**
* <code>JFontChooser</code> provides a pane of controls designed to allow
* a user to manipulate and select a font.
*
* This class provides three levels of API:
* <ol>
* <li>A static convenience method which shows a modal font-chooser
* dialog and returns the font selected by the user.
* <li>A static convenience method for creating a font-chooser dialog
* where <code>ActionListeners</code> can be specified to be invoked when
* the user presses one of the dialog buttons.
* <li>The ability to create instances of <code>JFontChooser</code> panes
* directly (within any container). <code>PropertyChange</code> listeners
* can be added to detect when the current "font" property changes.
* </ol>
* <p>
*
* @author Adrian BER
*/
public class JFontChooser extends JComponent {
/** The list of possible font sizes. */
private static final Integer[] SIZES =
{8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 24, 26, 28, 32, 36, 40, 48, 56, 64, 72};
/** The list of possible fonts. */
private static final String[] FONTS = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getAvailableFontFamilyNames();
private FontSelectionModel selectionModel;
private JList fontList;
private JList sizeList;
private JCheckBox boldCheckBox;
private JCheckBox italicCheckBox;
private JLabel previewLabel;
/** The preview text, if null the font name will be the preview text. */
private String previewText;
/** Listener used to update the font of the selection model. */
private SelectionUpdater selectionUpdater = new SelectionUpdater();
/** Listener used to update the font in the components. This should be registered
* with the selection model. */
private LabelUpdater labelUpdater = new LabelUpdater();
/** True if the components are being updated and no event should be generated. */
private boolean updatingComponents = false;
/** Listener class used to update the font in the components. This should be registered
* with the selection model. */
private class LabelUpdater implements ChangeListener {
public void stateChanged(ChangeEvent e) {
updateComponents();
}
}
/** Listener class used to update the font of the preview label. */
private class SelectionUpdater implements ChangeListener, ListSelectionListener {
public void stateChanged(ChangeEvent e) {
if (!updatingComponents) {
setFont(buildFont());
}
}
public void valueChanged(ListSelectionEvent e) {
if (!updatingComponents) {
setFont(buildFont());
}
}
}
/**
* Shows a modal font-chooser dialog and blocks until the
* dialog is hidden. If the user presses the "OK" button, then
* this method hides/disposes the dialog and returns the selected color.
* If the user presses the "Cancel" button or closes the dialog without
* pressing "OK", then this method hides/disposes the dialog and returns
* <code>null</code>.
*
* @param component the parent <code>Component</code> for the dialog
* @param title the String containing the dialog's title
* @return the selected font or <code>null</code> if the user opted out
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
public Font showDialog(Component component, String title) {
FontTracker ok = new FontTracker(this);
JDialog dialog = createDialog(component, title, true, ok, null);
dialog.addWindowListener(new FontChooserDialog.Closer());
dialog.addComponentListener(new FontChooserDialog.DisposeOnClose());
dialog.setVisible(true); // blocks until user brings dialog down...
return ok.getFont();
}
/**
* Creates and returns a new dialog containing the specified
* <code>ColorChooser</code> pane along with "OK", "Cancel", and "Reset"
* buttons. If the "OK" or "Cancel" buttons are pressed, the dialog is
* automatically hidden (but not disposed). If the "Reset"
* button is pressed, the color-chooser's color will be reset to the
* font which was set the last time <code>show</code> was invoked on the
* dialog and the dialog will remain showing.
*
* @param c the parent component for the dialog
* @param title the title for the dialog
* @param modal a boolean. When true, the remainder of the program
* is inactive until the dialog is closed.
* @param okListener the ActionListener invoked when "OK" is pressed
* @param cancelListener the ActionListener invoked when "Cancel" is pressed
* @return a new dialog containing the font-chooser pane
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
public JDialog createDialog(Component c, String title, boolean modal,
ActionListener okListener, ActionListener cancelListener) {
return new FontChooserDialog(c, title, modal, this,
okListener, cancelListener);
}
/**
* Creates a color chooser pane with an initial font which is the same font
* as the default font for labels.
*/
public JFontChooser() {
this(new DefaultFontSelectionModel());
}
/**
* Creates a font chooser pane with the specified initial font.
*
* @param initialFont the initial font set in the chooser
*/
public JFontChooser(Font initialFont) {
this(new DefaultFontSelectionModel(initialFont));
}
/**
* Creates a font chooser pane with the specified
* <code>FontSelectionModel</code>.
*
* @param model the font selection model used by this component
*/
public JFontChooser(FontSelectionModel model) {
selectionModel = model;
init(model.getSelectedFont());
selectionModel.addChangeListener(labelUpdater);
}
private void init(Font font) {
setLayout(new GridBagLayout());
Insets ins = new Insets(2, 2, 2, 2);
fontList = new JList(FONTS);
fontList.setVisibleRowCount(10);
fontList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
add(new JScrollPane(fontList), new GridBagConstraints(0, 0, 1, 1, 2, 2,
GridBagConstraints.CENTER, GridBagConstraints.BOTH,
ins, 0, 0));
sizeList = new JList(SIZES);
((JLabel)sizeList.getCellRenderer()).setHorizontalAlignment(JLabel.RIGHT);
sizeList.setVisibleRowCount(10);
sizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
add(new JScrollPane(sizeList), new GridBagConstraints(1, 0, 1, 1, 1, 2,
GridBagConstraints.CENTER, GridBagConstraints.BOTH,
ins, 0, 0));
boldCheckBox = new JCheckBox("Bold");
add(boldCheckBox, new GridBagConstraints(0, 1, 2, 1, 1, 0,
GridBagConstraints.WEST, GridBagConstraints.NONE,
ins, 0, 0));
italicCheckBox = new JCheckBox("Italic");
add(italicCheckBox, new GridBagConstraints(0, 2, 2, 1, 1, 0,
GridBagConstraints.WEST, GridBagConstraints.NONE,
ins, 0, 0));
previewLabel = new JLabel("");
previewLabel.setHorizontalAlignment(JLabel.CENTER);
previewLabel.setVerticalAlignment(JLabel.CENTER);
add(new JScrollPane(previewLabel), new GridBagConstraints(0, 3, 2, 1, 1, 1,
GridBagConstraints.CENTER, GridBagConstraints.BOTH,
ins, 0, 0));
setFont(font == null ? previewLabel.getFont() : font);
fontList.addListSelectionListener(selectionUpdater);
sizeList.addListSelectionListener(selectionUpdater);
boldCheckBox.addChangeListener(selectionUpdater);
italicCheckBox.addChangeListener(selectionUpdater);
}
private Font buildFont() {
// Font labelFont = previewLabel.getFont();
String fontName = (String)fontList.getSelectedValue();
if (fontName == null) {
return null;
// fontName = labelFont.getName();
}
Integer sizeInt = (Integer)sizeList.getSelectedValue();
if (sizeInt == null) {
// size = labelFont.getSize();
return null;
}
// create the font
// // first create the font attributes
// HashMap map = new HashMap();
// map.put(TextAttribute.BACKGROUND, Color.white);
// map.put(TextAttribute.FAMILY, fontName);
// map.put(TextAttribute.FOREGROUND, Color.black);
// map.put(TextAttribute.SIZE , new Float(size));
// map.put(TextAttribute.UNDERLINE, italicCheckBox.isSelected() ? TextAttribute.UNDERLINE_LOW_ONE_PIXEL : TextAttribute.UNDERLINE_LOW_TWO_PIXEL);
// map.put(TextAttribute.STRIKETHROUGH, italicCheckBox.isSelected() ? TextAttribute.STRIKETHROUGH_ON : Boolean.FALSE);
// map.put(TextAttribute.WEIGHT, boldCheckBox.isSelected() ? TextAttribute.WEIGHT_BOLD : TextAttribute.WEIGHT_REGULAR);
// map.put(TextAttribute.POSTURE,
// italicCheckBox.isSelected() ? TextAttribute.POSTURE_OBLIQUE : TextAttribute.POSTURE_REGULAR);
//
// return new Font(map);
return new Font(fontName,
(italicCheckBox.isSelected() ? Font.ITALIC : Font.PLAIN)
| (boldCheckBox.isSelected() ? Font.BOLD : Font.PLAIN),
sizeInt);
}
/** Updates the font in the preview component according to the selected values. */
private void updateComponents() {
updatingComponents = true;
Font font = getFont();
fontList.setSelectedValue(font.getName(), true);
sizeList.setSelectedValue(font.getSize(), true);
boldCheckBox.setSelected(font.isBold());
italicCheckBox.setSelected(font.isItalic());
if (previewText == null) {
previewLabel.setText(font.getName());
}
// set the font and fire a property change
Font oldValue = previewLabel.getFont();
previewLabel.setFont(font);
firePropertyChange("font", oldValue, font);
updatingComponents = false;
}
/**
* Returns the data model that handles font selections.
*
* @return a FontSelectionModel object
*/
public FontSelectionModel getSelectionModel() {
return selectionModel;
}
/**
* Set the model containing the selected font.
*
* @param newModel the new FontSelectionModel object
*/
public void setSelectionModel(FontSelectionModel newModel ) {
FontSelectionModel oldModel = selectionModel;
selectionModel = newModel;
oldModel.removeChangeListener(labelUpdater);
newModel.addChangeListener(labelUpdater);
firePropertyChange("selectionModel", oldModel, newModel);
}
/**
* Gets the current font value from the font chooser.
*
* @return the current font value of the font chooser
*/
public Font getFont() {
return selectionModel.getSelectedFont();
}
/**
* Sets the current font of the font chooser to the specified font.
* The <code>ColorSelectionModel</code> will fire a <code>ChangeEvent</code>
* @param font the font to be set in the font chooser
* @see JComponent#addPropertyChangeListener
*/
public void setFont(Font font) {
selectionModel.setSelectedFont(font);
}
/** Returns the preview text displayed in the preview component.
* @return the preview text, if null the font name will be displayed
*/
public String getPreviewText() {
return previewText;
}
/** Sets the preview text displayed in the preview component.
* @param previewText the preview text, if null the font name will be displayed
*/
public void setPreviewText(String previewText) {
this.previewText = previewText;
previewLabel.setText("");
updateComponents();
}
}
/*
* Class which builds a font chooser dialog consisting of
* a JFontChooser with "Ok", "Cancel", and "Reset" buttons.
*
* Note: This needs to be fixed to deal with localization!
*/
class FontChooserDialog extends JDialog {
private Font initialFont;
private JFontChooser chooserPane;
public FontChooserDialog(Component c, String title, boolean modal,
JFontChooser chooserPane,
ActionListener okListener, ActionListener cancelListener) {
super(JOptionPane.getFrameForComponent(c), title, modal);
//setResizable(false);
String okString = UIManager.getString("ColorChooser.okText");
String cancelString = UIManager.getString("ColorChooser.cancelText");
String resetString = UIManager.getString("ColorChooser.resetText");
/*
* Create Lower button panel
*/
JPanel buttonPane = new JPanel();
buttonPane.setLayout(new FlowLayout(FlowLayout.CENTER));
JButton okButton = new JButton(okString);
getRootPane().setDefaultButton(okButton);
okButton.setActionCommand("OK");
if (okListener != null) {
okButton.addActionListener(okListener);
}
okButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
}
});
buttonPane.add(okButton);
JButton cancelButton = new JButton(cancelString);
// The following few lines are used to register esc to close the dialog
Action cancelKeyAction = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
// todo make it in 1.3
// ActionListener[] listeners
// = ((AbstractButton) e.getSource()).getActionListeners();
// for (int i = 0; i < listeners.length; i++) {
// listeners[i].actionPerformed(e);
// }
}
};
KeyStroke cancelKeyStroke = KeyStroke.getKeyStroke((char) KeyEvent.VK_ESCAPE);
InputMap inputMap = cancelButton.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
ActionMap actionMap = cancelButton.getActionMap();
if (inputMap != null && actionMap != null) {
inputMap.put(cancelKeyStroke, "cancel");
actionMap.put("cancel", cancelKeyAction);
}
// end esc handling
cancelButton.setActionCommand("cancel");
if (cancelListener != null) {
cancelButton.addActionListener(cancelListener);
}
cancelButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
}
});
buttonPane.add(cancelButton);
JButton resetButton = new JButton(resetString);
resetButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
reset();
}
});
int mnemonic = UIManager.getInt("ColorChooser.resetMnemonic");
if (mnemonic != -1) {
resetButton.setMnemonic(mnemonic);
}
buttonPane.add(resetButton);
// initialiase the content pane
this.chooserPane = chooserPane;
Container contentPane = getContentPane();
contentPane.setLayout(new BorderLayout());
contentPane.add(chooserPane, BorderLayout.CENTER);
contentPane.add(buttonPane, BorderLayout.SOUTH);
pack();
setLocationRelativeTo(c);
}
public void setVisible(boolean visible) {
if (visible)
initialFont = chooserPane.getFont();
super.setVisible(visible);
}
public void reset() {
chooserPane.setFont(initialFont);
}
static class Closer extends WindowAdapter implements Serializable {
public void windowClosing(WindowEvent e) {
Window w = e.getWindow();
w.setVisible(false);
}
}
static class DisposeOnClose extends ComponentAdapter implements Serializable {
public void componentHidden(ComponentEvent e) {
Window w = (Window) e.getComponent();
w.dispose();
}
}
}
class FontTracker implements ActionListener, Serializable {
JFontChooser chooser;
Font color;
public FontTracker(JFontChooser c) {
chooser = c;
}
public void actionPerformed(ActionEvent e) {
color = chooser.getFont();
}
public Font getFont() {
return color;
}
}
/**
* A generic implementation of <code>{@link FontSelectionModel}</code>.
*
* @author Adrian BER
*/
class DefaultFontSelectionModel implements FontSelectionModel {
/** The default selected font. */
private static final Font DEFAULT_INITIAL_FONT = new Font("Dialog", Font.PLAIN, 12);
/** The selected font. */
private Font selectedFont;
/** The change listeners notified by a change in this model. */
private EventListenerList listeners = new EventListenerList();
/**
* Creates a <code>DefaultFontSelectionModel</code> with the
* current font set to <code>Dialog, 12</code>. This is
* the default constructor.
*/
public DefaultFontSelectionModel() {
this(DEFAULT_INITIAL_FONT);
}
/**
* Creates a <code>DefaultFontSelectionModel</code> with the
* current font set to <code>font</code>, which should be
* non-<code>null</code>. Note that setting the font to
* <code>null</code> is undefined and may have unpredictable
* results.
*
* @param selectedFont the new <code>Font</code>
*/
public DefaultFontSelectionModel(Font selectedFont) {
if (selectedFont == null) {
selectedFont = DEFAULT_INITIAL_FONT;
}
this.selectedFont = selectedFont;
}
public Font getSelectedFont() {
return selectedFont;
}
public void setSelectedFont(Font selectedFont) {
if (selectedFont != null) {
this.selectedFont = selectedFont;
fireChangeListeners();
}
}
public void addChangeListener(ChangeListener listener) {
listeners.add(ChangeListener.class, listener);
}
public void removeChangeListener(ChangeListener listener) {
listeners.remove(ChangeListener.class, listener);
}
/** Fires the listeners registered with this model. */
protected void fireChangeListeners() {
ChangeEvent ev = new ChangeEvent(this);
Object[] l = listeners.getListeners(ChangeListener.class);
for (Object listener : l) {
((ChangeListener) listener).stateChanged(ev);
}
}
}
/**
* A model that supports selecting a <code>Font</code>.
*
* @author Adrian BER
*
* @see java.awt.Font
*/
interface FontSelectionModel {
/**
* Returns the selected <code>Font</code> which should be
* non-<code>null</code>.
*
* @return the selected <code>Font</code>
* @see #setSelectedFont
*/
Font getSelectedFont();
/**
* Sets the selected font to <code>font</code>.
* Note that setting the font to <code>null</code>
* is undefined and may have unpredictable results.
* This method fires a state changed event if it sets the
* current font to a new non-<code>null</code> font.
*
* @param font the new <code>Font</code>
* @see #getSelectedFont
* @see #addChangeListener
*/
void setSelectedFont(Font font);
/**
* Adds <code>listener</code> as a listener to changes in the model.
* @param listener the <code>ChangeListener</code> to be added
*/
void addChangeListener(ChangeListener listener);
/**
* Removes <code>listener</code> as a listener to changes in the model.
* @param listener the <code>ChangeListener</code> to be removed
*/
void removeChangeListener(ChangeListener listener);
}
//////////////////////////////
package com.greef.ui.font;
import com.greef.ui.UIUtilities;
import javax.swing.*;
import javax.swing.event.ChangeListener;
import javax.swing.event.ChangeEvent;
import javax.swing.event.DocumentListener;
import javax.swing.event.DocumentEvent;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
/**
* @author Adrian BER (beradrian@yahoo.com)
*/
public class JFontChooserDemo extends JPanel {
private static final Insets INSETS = new Insets(5, 5, 5, 5);
private JFontChooser fontChooser;
private JCheckBox defaultPreviewCheckBox;
private JTextField previewTextField;
private JLabel previewLabel;
private JTextArea codeTextArea;
public JFontChooserDemo() {
init();
}
private void init() {
setLayout(new GridBagLayout());
defaultPreviewCheckBox = new JCheckBox("Use font name as the preview text");
defaultPreviewCheckBox.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
boolean selected = defaultPreviewCheckBox.isSelected();
fontChooser.setPreviewText(selected ? null : previewTextField.getText());
previewLabel.setEnabled(!selected);
previewTextField.setEnabled(!selected);
updateCode();
}
});
add(defaultPreviewCheckBox, new GridBagConstraints(0, 0, 2, 1, 0, 0, GridBagConstraints.WEST,
GridBagConstraints.NONE, INSETS, 0, 0));
previewLabel = new JLabel("Preview text:");
add(previewLabel, new GridBagConstraints(0, 1, 1, 1, 0, 0, GridBagConstraints.EAST,
GridBagConstraints.NONE, INSETS, 0, 0));
previewTextField = new JTextField();
previewTextField.getDocument().addDocumentListener(new DocumentListener() {
private void changePreviewText() {
fontChooser.setPreviewText(previewTextField.getText());
updateCode();
}
public void insertUpdate(DocumentEvent e) {
changePreviewText();
}
public void removeUpdate(DocumentEvent e) {
changePreviewText();
}
public void changedUpdate(DocumentEvent e) {
changePreviewText();
}
});
add(previewTextField, new GridBagConstraints(1, 1, 1, 1, 1, 0, GridBagConstraints.WEST,
GridBagConstraints.HORIZONTAL, INSETS, 0, 0));
JButton testButton = new JButton("Test");
testButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Font font = fontChooser.showDialog(JFontChooserDemo.this, "Choose a font");
JOptionPane.showMessageDialog(JFontChooserDemo.this, font == null ? "You canceled the dialog."
: "You have selected " + font.getName() + ", " + font.getSize()
+ (font.isBold() ? ", Bold" : "") + (font.isItalic() ? ", Italic" : ""));
}
});
add(testButton, new GridBagConstraints(0, 2, 2, 1, 1, 0, GridBagConstraints.NORTHEAST,
GridBagConstraints.NONE, INSETS, 0, 0));
codeTextArea = new JTextArea(5, 30);
codeTextArea.setOpaque(false);
codeTextArea.setEditable(false);
codeTextArea.setBorder(BorderFactory.createTitledBorder("Code"));
add(codeTextArea, new GridBagConstraints(0, 3, 2, 1, 1, 1, GridBagConstraints.CENTER,
GridBagConstraints.BOTH, INSETS, 0, 0));
setFontChooser(new JFontChooser());
}
private void setFontChooser(JFontChooser fontChooser) {
this.fontChooser = fontChooser;
String previewText = fontChooser.getPreviewText();
defaultPreviewCheckBox.setSelected(previewText == null);
previewTextField.setText(previewText);
updateCode();
}
private void updateCode() {
codeTextArea.setText("JFontChooser fontChooser = new JFontChooser();\n"
+ (defaultPreviewCheckBox.isSelected() ? "" : "fontChooser.setPreviewText(\""
+ previewTextField.getText() + "\");\n")
+ "Font font = fontChooser.showDialog(invokerComponent, \"Choose a font\");\n"
+ "System.out.println(font == null ? \"You have canceled the dialog.\" : \"You have selected \" + font);");
}
public void updateUI() {
super.updateUI();
if (fontChooser != null)
SwingUtilities.updateComponentTreeUI(fontChooser);
}
}
