在我的 Java Swing 应用程序中，我想让用户选择他们的字体。令我惊讶的是，没有核心 swing 库来选择字体。我希望找到一个 JFileChooser 但没有这样的实用程序。这看起来像是一个简单的对话框，我确信它存在于那里。我真的不想自己写。
我在互联网上四处张望，发现了这种类型对话框的几种不同实现方式。问题是它们中的大多数都在随机博客上或者只是代码片段。我正在寻找属于经过良好使用和测试的库的一部分的东西。它还需要具有商业友好许可证。
有谁知道他们可以推荐的 swing 中好的 Java 文件选择器？
原文由 Chris Dail 发布，翻译遵循 CC BY-SA 4.0 许可协议
旧线程，但这是 JFontChooser 中的代码，删除了所有不必要的资源。将其复制并粘贴到一个新类中，它提供了一些我认为默认情况下应该存在的强大功能。
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java /************************************************************
* Copyright 2004-2005,2007-2008 Masahiko SAWAI All Rights Reserved.
************************************************************/
package paint;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.border.Border;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.Position;
/**
* The <code>JFontChooser</code> class is a swing component
* for font selection.
* This class has <code>JFileChooser</code> like APIs.
* The following code pops up a font chooser dialog.
* <pre>
* JFontChooser fontChooser = new JFontChooser();
* int result = fontChooser.showDialog(parent);
* if (result == JFontChooser.OK_OPTION)
* {
* Font font = fontChooser.getSelectedFont();
* System.out.println("Selected Font : " + font);
* }
* <pre>
**/
public class JFontChooser extends JComponent
{
// class variables
/**
* Return value from <code>showDialog()</code>.
* @see #showDialog
**/
public static final int OK_OPTION = 0;
/**
* Return value from <code>showDialog()</code>.
* @see #showDialog
**/
public static final int CANCEL_OPTION = 1;
/**
* Return value from <code>showDialog()</code>.
* @see #showDialog
**/
public static final int ERROR_OPTION = -1;
private static final Font DEFAULT_SELECTED_FONT = new Font("Serif", Font.PLAIN, 12);
private static final Font DEFAULT_FONT = new Font("Dialog", Font.PLAIN, 10);
private static final int[] FONT_STYLE_CODES =
{
Font.PLAIN, Font.BOLD, Font.ITALIC, Font.BOLD | Font.ITALIC
};
private static final String[] DEFAULT_FONT_SIZE_STRINGS =
{
"8", "9", "10", "11", "12", "14", "16", "18", "20",
"22", "24", "26", "28", "36", "48", "72",
};
// instance variables
protected int dialogResultValue = ERROR_OPTION;
private String[] fontStyleNames = null;
private String[] fontFamilyNames = null;
private String[] fontSizeStrings = null;
private JTextField fontFamilyTextField = null;
private JTextField fontStyleTextField = null;
private JTextField fontSizeTextField = null;
private JList fontNameList = null;
private JList fontStyleList = null;
private JList fontSizeList = null;
private JPanel fontNamePanel = null;
private JPanel fontStylePanel = null;
private JPanel fontSizePanel = null;
private JPanel samplePanel = null;
private JTextField sampleText = null;
/**
* Constructs a <code>JFontChooser</code> object.
**/
public JFontChooser()
{
this(DEFAULT_FONT_SIZE_STRINGS);
}
/**
* Constructs a <code>JFontChooser</code> object using the given font size array.
* @param fontSizeStrings the array of font size string.
**/
public JFontChooser(String[] fontSizeStrings)
{
if (fontSizeStrings == null)
{
fontSizeStrings = DEFAULT_FONT_SIZE_STRINGS;
}
this.fontSizeStrings = fontSizeStrings;
JPanel selectPanel = new JPanel();
selectPanel.setLayout(new BoxLayout(selectPanel, BoxLayout.X_AXIS));
selectPanel.add(getFontFamilyPanel());
selectPanel.add(getFontStylePanel());
selectPanel.add(getFontSizePanel());
JPanel contentsPanel = new JPanel();
contentsPanel.setLayout(new GridLayout(2, 1));
contentsPanel.add(selectPanel, BorderLayout.NORTH);
contentsPanel.add(getSamplePanel(), BorderLayout.CENTER);
this.setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
this.add(contentsPanel);
this.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
this.setSelectedFont(DEFAULT_SELECTED_FONT);
}
public JTextField getFontFamilyTextField()
{
if (fontFamilyTextField == null)
{
fontFamilyTextField = new JTextField();
fontFamilyTextField.addFocusListener(
new TextFieldFocusHandlerForTextSelection(fontFamilyTextField));
fontFamilyTextField.addKeyListener(
new TextFieldKeyHandlerForListSelectionUpDown(getFontFamilyList()));
fontFamilyTextField.getDocument().addDocumentListener(
new ListSearchTextFieldDocumentHandler(getFontFamilyList()));
fontFamilyTextField.setFont(DEFAULT_FONT);
}
return fontFamilyTextField;
}
public JTextField getFontStyleTextField()
{
if (fontStyleTextField == null)
{
fontStyleTextField = new JTextField();
fontStyleTextField.addFocusListener(
new TextFieldFocusHandlerForTextSelection(fontStyleTextField));
fontStyleTextField.addKeyListener(
new TextFieldKeyHandlerForListSelectionUpDown(getFontStyleList()));
fontStyleTextField.getDocument().addDocumentListener(
new ListSearchTextFieldDocumentHandler(getFontStyleList()));
fontStyleTextField.setFont(DEFAULT_FONT);
}
return fontStyleTextField;
}
public JTextField getFontSizeTextField()
{
if (fontSizeTextField == null)
{
fontSizeTextField = new JTextField();
fontSizeTextField.addFocusListener(
new TextFieldFocusHandlerForTextSelection(fontSizeTextField));
fontSizeTextField.addKeyListener(
new TextFieldKeyHandlerForListSelectionUpDown(getFontSizeList()));
fontSizeTextField.getDocument().addDocumentListener(
new ListSearchTextFieldDocumentHandler(getFontSizeList()));
fontSizeTextField.setFont(DEFAULT_FONT);
}
return fontSizeTextField;
}
public JList getFontFamilyList()
{
if (fontNameList == null)
{
fontNameList = new JList(getFontFamilies());
fontNameList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
fontNameList.addListSelectionListener(
new ListSelectionHandler(getFontFamilyTextField()));
fontNameList.setSelectedIndex(0);
fontNameList.setFont(DEFAULT_FONT);
fontNameList.setFocusable(false);
}
return fontNameList;
}
public JList getFontStyleList()
{
if (fontStyleList == null)
{
fontStyleList = new JList(getFontStyleNames());
fontStyleList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
fontStyleList.addListSelectionListener(
new ListSelectionHandler(getFontStyleTextField()));
fontStyleList.setSelectedIndex(0);
fontStyleList.setFont(DEFAULT_FONT);
fontStyleList.setFocusable(false);
}
return fontStyleList;
}
public JList getFontSizeList()
{
if (fontSizeList == null)
{
fontSizeList = new JList(this.fontSizeStrings);
fontSizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
fontSizeList.addListSelectionListener(
new ListSelectionHandler(getFontSizeTextField()));
fontSizeList.setSelectedIndex(0);
fontSizeList.setFont(DEFAULT_FONT);
fontSizeList.setFocusable(false);
}
return fontSizeList;
}
/**
* Get the family name of the selected font.
* @return the font family of the selected font.
*
* @see #setSelectedFontFamily
**/
public String getSelectedFontFamily()
{
String fontName = (String) getFontFamilyList().getSelectedValue();
return fontName;
}
/**
* Get the style of the selected font.
* @return the style of the selected font.
* <code>Font.PLAIN</code>, <code>Font.BOLD</code>,
* <code>Font.ITALIC</code>, <code>Font.BOLD|Font.ITALIC</code>
*
* @see java.awt.Font#PLAIN
* @see java.awt.Font#BOLD
* @see java.awt.Font#ITALIC
* @see #setSelectedFontStyle
**/
public int getSelectedFontStyle()
{
int index = getFontStyleList().getSelectedIndex();
return FONT_STYLE_CODES[index];
}
/**
* Get the size of the selected font.
* @return the size of the selected font
*
* @see #setSelectedFontSize
**/
public int getSelectedFontSize()
{
int fontSize = 1;
String fontSizeString = getFontSizeTextField().getText();
while (true)
{
try
{
fontSize = Integer.parseInt(fontSizeString);
break;
}
catch (NumberFormatException e)
{
fontSizeString = (String) getFontSizeList().getSelectedValue();
getFontSizeTextField().setText(fontSizeString);
}
}
return fontSize;
}
/**
* Get the selected font.
* @return the selected font
*
* @see #setSelectedFont
* @see java.awt.Font
**/
public Font getSelectedFont()
{
Font font = new Font(getSelectedFontFamily(),
getSelectedFontStyle(), getSelectedFontSize());
return font;
}
/**
* Set the family name of the selected font.
* @param name the family name of the selected font.
*
* @see getSelectedFontFamily
**/
public void setSelectedFontFamily(String name)
{
String[] names = getFontFamilies();
for (int i = 0; i < names.length; i++)
{
if (names[i].toLowerCase().equals(name.toLowerCase()))
{
getFontFamilyList().setSelectedIndex(i);
break;
}
}
updateSampleFont();
}
/**
* Set the style of the selected font.
* @param style the size of the selected font.
* <code>Font.PLAIN</code>, <code>Font.BOLD</code>,
* <code>Font.ITALIC</code>, or
* <code>Font.BOLD|Font.ITALIC</code>.
*
* @see java.awt.Font#PLAIN
* @see java.awt.Font#BOLD
* @see java.awt.Font#ITALIC
* @see #getSelectedFontStyle
**/
public void setSelectedFontStyle(int style)
{
for (int i = 0; i < FONT_STYLE_CODES.length; i++)
{
if (FONT_STYLE_CODES[i] == style)
{
getFontStyleList().setSelectedIndex(i);
break;
}
}
updateSampleFont();
}
/**
* Set the size of the selected font.
* @param size the size of the selected font
*
* @see #getSelectedFontSize
**/
public void setSelectedFontSize(int size)
{
String sizeString = String.valueOf(size);
for (int i = 0; i < this.fontSizeStrings.length; i++)
{
if (this.fontSizeStrings[i].equals(sizeString))
{
getFontSizeList().setSelectedIndex(i);
break;
}
}
getFontSizeTextField().setText(sizeString);
updateSampleFont();
}
/**
* Set the selected font.
* @param font the selected font
*
* @see #getSelectedFont
* @see java.awt.Font
**/
public void setSelectedFont(Font font)
{
setSelectedFontFamily(font.getFamily());
setSelectedFontStyle(font.getStyle());
setSelectedFontSize(font.getSize());
}
public String getVersionString()
{
return ("Version");
}
/**
* Show font selection dialog.
* @param parent Dialog's Parent component.
* @return OK_OPTION, CANCEL_OPTION or ERROR_OPTION
*
* @see #OK_OPTION
* @see #CANCEL_OPTION
* @see #ERROR_OPTION
**/
public int showDialog(Component parent)
{
dialogResultValue = ERROR_OPTION;
JDialog dialog = createDialog(parent);
dialog.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
dialogResultValue = CANCEL_OPTION;
}
});
dialog.setVisible(true);
dialog.dispose();
dialog = null;
return dialogResultValue;
}
protected class ListSelectionHandler implements ListSelectionListener
{
private JTextComponent textComponent;
ListSelectionHandler(JTextComponent textComponent)
{
this.textComponent = textComponent;
}
public void valueChanged(ListSelectionEvent e)
{
if (e.getValueIsAdjusting() == false)
{
JList list = (JList) e.getSource();
String selectedValue = (String) list.getSelectedValue();
String oldValue = textComponent.getText();
textComponent.setText(selectedValue);
if (!oldValue.equalsIgnoreCase(selectedValue))
{
textComponent.selectAll();
textComponent.requestFocus();
}
updateSampleFont();
}
}
}
protected class TextFieldFocusHandlerForTextSelection extends FocusAdapter
{
private JTextComponent textComponent;
public TextFieldFocusHandlerForTextSelection(JTextComponent textComponent)
{
this.textComponent = textComponent;
}
public void focusGained(FocusEvent e)
{
textComponent.selectAll();
}
public void focusLost(FocusEvent e)
{
textComponent.select(0, 0);
updateSampleFont();
}
}
protected class TextFieldKeyHandlerForListSelectionUpDown extends KeyAdapter
{
private JList targetList;
public TextFieldKeyHandlerForListSelectionUpDown(JList list)
{
this.targetList = list;
}
public void keyPressed(KeyEvent e)
{
int i = targetList.getSelectedIndex();
switch (e.getKeyCode())
{
case KeyEvent.VK_UP:
i = targetList.getSelectedIndex() - 1;
if (i < 0)
{
i = 0;
}
targetList.setSelectedIndex(i);
break;
case KeyEvent.VK_DOWN:
int listSize = targetList.getModel().getSize();
i = targetList.getSelectedIndex() + 1;
if (i >= listSize)
{
i = listSize - 1;
}
targetList.setSelectedIndex(i);
break;
default:
break;
}
}
}
protected class ListSearchTextFieldDocumentHandler implements DocumentListener
{
JList targetList;
public ListSearchTextFieldDocumentHandler(JList targetList)
{
this.targetList = targetList;
}
public void insertUpdate(DocumentEvent e)
{
update(e);
}
public void removeUpdate(DocumentEvent e)
{
update(e);
}
public void changedUpdate(DocumentEvent e)
{
update(e);
}
private void update(DocumentEvent event)
{
String newValue = "";
try
{
Document doc = event.getDocument();
newValue = doc.getText(0, doc.getLength());
}
catch (BadLocationException e)
{
e.printStackTrace();
}
if (newValue.length() > 0)
{
int index = targetList.getNextMatch(newValue, 0, Position.Bias.Forward);
if (index < 0)
{
index = 0;
}
targetList.ensureIndexIsVisible(index);
String matchedName = targetList.getModel().getElementAt(index).toString();
if (newValue.equalsIgnoreCase(matchedName))
{
if (index != targetList.getSelectedIndex())
{
SwingUtilities.invokeLater(new ListSelector(index));
}
}
}
}
public class ListSelector implements Runnable
{
private int index;
public ListSelector(int index)
{
this.index = index;
}
public void run()
{
targetList.setSelectedIndex(this.index);
}
}
}
protected class DialogOKAction extends AbstractAction
{
protected static final String ACTION_NAME = "OK";
private JDialog dialog;
protected DialogOKAction(JDialog dialog)
{
this.dialog = dialog;
putValue(Action.DEFAULT, ACTION_NAME);
putValue(Action.ACTION_COMMAND_KEY, ACTION_NAME);
putValue(Action.NAME, (ACTION_NAME));
}
public void actionPerformed(ActionEvent e)
{
dialogResultValue = OK_OPTION;
dialog.setVisible(false);
}
}
protected class DialogCancelAction extends AbstractAction
{
protected static final String ACTION_NAME = "Cancel";
private JDialog dialog;
protected DialogCancelAction(JDialog dialog)
{
this.dialog = dialog;
putValue(Action.DEFAULT, ACTION_NAME);
putValue(Action.ACTION_COMMAND_KEY, ACTION_NAME);
putValue(Action.NAME, (ACTION_NAME));
}
public void actionPerformed(ActionEvent e)
{
dialogResultValue = CANCEL_OPTION;
dialog.setVisible(false);
}
}
protected JDialog createDialog(Component parent)
{
Frame frame = parent instanceof Frame ? (Frame) parent
: (Frame) SwingUtilities.getAncestorOfClass(Frame.class, parent);
JDialog dialog = new JDialog(frame, ("Select Font"), true);
Action okAction = new DialogOKAction(dialog);
Action cancelAction = new DialogCancelAction(dialog);
JButton okButton = new JButton(okAction);
okButton.setFont(DEFAULT_FONT);
JButton cancelButton = new JButton(cancelAction);
cancelButton.setFont(DEFAULT_FONT);
JPanel buttonsPanel = new JPanel();
buttonsPanel.setLayout(new GridLayout(2, 1));
buttonsPanel.add(okButton);
buttonsPanel.add(cancelButton);
buttonsPanel.setBorder(BorderFactory.createEmptyBorder(25, 0, 10, 10));
ActionMap actionMap = buttonsPanel.getActionMap();
actionMap.put(cancelAction.getValue(Action.DEFAULT), cancelAction);
actionMap.put(okAction.getValue(Action.DEFAULT), okAction);
InputMap inputMap = buttonsPanel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
inputMap.put(KeyStroke.getKeyStroke("ESCAPE"), cancelAction.getValue(Action.DEFAULT));
inputMap.put(KeyStroke.getKeyStroke("ENTER"), okAction.getValue(Action.DEFAULT));
JPanel dialogEastPanel = new JPanel();
dialogEastPanel.setLayout(new BorderLayout());
dialogEastPanel.add(buttonsPanel, BorderLayout.NORTH);
dialog.getContentPane().add(this, BorderLayout.CENTER);
dialog.getContentPane().add(dialogEastPanel, BorderLayout.EAST);
dialog.pack();
dialog.setLocationRelativeTo(frame);
return dialog;
}
protected void updateSampleFont()
{
Font font = getSelectedFont();
getSampleTextField().setFont(font);
}
protected JPanel getFontFamilyPanel()
{
if (fontNamePanel == null)
{
fontNamePanel = new JPanel();
fontNamePanel.setLayout(new BorderLayout());
fontNamePanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
fontNamePanel.setPreferredSize(new Dimension(180, 130));
JScrollPane scrollPane = new JScrollPane(getFontFamilyList());
scrollPane.getVerticalScrollBar().setFocusable(false);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
JPanel p = new JPanel();
p.setLayout(new BorderLayout());
p.add(getFontFamilyTextField(), BorderLayout.NORTH);
p.add(scrollPane, BorderLayout.CENTER);
JLabel label = new JLabel(("Font Name"));
label.setHorizontalAlignment(JLabel.LEFT);
label.setHorizontalTextPosition(JLabel.LEFT);
label.setLabelFor(getFontFamilyTextField());
label.setDisplayedMnemonic('F');
fontNamePanel.add(label, BorderLayout.NORTH);
fontNamePanel.add(p, BorderLayout.CENTER);
}
return fontNamePanel;
}
protected JPanel getFontStylePanel()
{
if (fontStylePanel == null)
{
fontStylePanel = new JPanel();
fontStylePanel.setLayout(new BorderLayout());
fontStylePanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
fontStylePanel.setPreferredSize(new Dimension(140, 130));
JScrollPane scrollPane = new JScrollPane(getFontStyleList());
scrollPane.getVerticalScrollBar().setFocusable(false);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
JPanel p = new JPanel();
p.setLayout(new BorderLayout());
p.add(getFontStyleTextField(), BorderLayout.NORTH);
p.add(scrollPane, BorderLayout.CENTER);
JLabel label = new JLabel(("Font Style"));
label.setHorizontalAlignment(JLabel.LEFT);
label.setHorizontalTextPosition(JLabel.LEFT);
label.setLabelFor(getFontStyleTextField());
label.setDisplayedMnemonic('Y');
fontStylePanel.add(label, BorderLayout.NORTH);
fontStylePanel.add(p, BorderLayout.CENTER);
}
return fontStylePanel;
}
protected JPanel getFontSizePanel()
{
if (fontSizePanel == null)
{
fontSizePanel = new JPanel();
fontSizePanel.setLayout(new BorderLayout());
fontSizePanel.setPreferredSize(new Dimension(70, 130));
fontSizePanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
JScrollPane scrollPane = new JScrollPane(getFontSizeList());
scrollPane.getVerticalScrollBar().setFocusable(false);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
JPanel p = new JPanel();
p.setLayout(new BorderLayout());
p.add(getFontSizeTextField(), BorderLayout.NORTH);
p.add(scrollPane, BorderLayout.CENTER);
JLabel label = new JLabel(("Font Size"));
label.setHorizontalAlignment(JLabel.LEFT);
label.setHorizontalTextPosition(JLabel.LEFT);
label.setLabelFor(getFontSizeTextField());
label.setDisplayedMnemonic('S');
fontSizePanel.add(label, BorderLayout.NORTH);
fontSizePanel.add(p, BorderLayout.CENTER);
}
return fontSizePanel;
}
protected JPanel getSamplePanel()
{
if (samplePanel == null)
{
Border titledBorder = BorderFactory.createTitledBorder(
BorderFactory.createEtchedBorder(), ("Sample"));
Border empty = BorderFactory.createEmptyBorder(5, 10, 10, 10);
Border border = BorderFactory.createCompoundBorder(titledBorder, empty);
samplePanel = new JPanel();
samplePanel.setLayout(new BorderLayout());
samplePanel.setBorder(border);
samplePanel.add(getSampleTextField(), BorderLayout.CENTER);
}
return samplePanel;
}
protected JTextField getSampleTextField()
{
if (sampleText == null)
{
Border lowered = BorderFactory.createLoweredBevelBorder();
sampleText = new JTextField(("AaBbYyZz"));
sampleText.setBorder(lowered);
sampleText.setPreferredSize(new Dimension(300, 100));
}
return sampleText;
}
protected String[] getFontFamilies()
{
if (fontFamilyNames == null)
{
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
fontFamilyNames = env.getAvailableFontFamilyNames();
}
return fontFamilyNames;
}
protected String[] getFontStyleNames()
{
if (fontStyleNames == null)
{
int i = 0;
fontStyleNames = new String[4];
fontStyleNames[i++] = ("Plain");
fontStyleNames[i++] = ("Bold");
fontStyleNames[i++] = ("Italic");
fontStyleNames[i++] = ("BoldItalic");
}
return fontStyleNames;
}
}
原文由 David 发布，翻译遵循 CC BY-SA 3.0 许可协议
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JFontChooser 看起来不错而且是开源的。