A dialog allow selection and a font and its associated info. : JDialog « Swing « Java Tutorial






/*
 * Copyright (C) 2001-2004 Colin Bell
 * colbell@users.sourceforge.net
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
import java.awt.BorderLayout;
import java.awt.Dialog;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.Serializable;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * A dialog allow selection and a font and its associated info.
 *
 * @author <A HREF="mailto:colbell@users.sourceforge.net">Colin Bell</A>
 */
public class FontChooser extends JDialog
{

  private final boolean _selectStyles;

  private JComboBox _fontNamesCmb;
  private final JComboBox _fontSizesCmb = new JComboBox(new String[]
                        { "8", "9", "10", "12", "14" });
  private final JCheckBox _boldChk = new JCheckBox("Bold");
  private final JCheckBox _italicChk = new JCheckBox("Italic");
  private final JLabel _previewLbl = new JLabel("PreviewText");

  private Font _font;

  private ActionListener _previewUpdater;

  /**
   * Default ctor.
   */
  public FontChooser()
  {
    this((Frame)null);
  }

  /**
   * ctor specifying whether styles can be selected.
   *
   * @param selectStyles  If <TT>true</TT> bold and italic checkboxes displayed.
   */
  public FontChooser(boolean selectStyles)
  {
    this((Frame)null, selectStyles);
  }

  /**
   * ctor specifying the parent frame.
   *
   * @param owner Parent frame.
   */
  public FontChooser(Frame owner)
  {
    super(owner, "Font Chooser", true);
    _selectStyles = true;
    createUserInterface();
  }

  /**
   * ctor specifying the parent frame and whether styles can be selected.
   *
   * @param owner     Parent frame.
   * @param selectStyles  If <TT>true</TT> bold and italic checkboxes displayed.
   */
  public FontChooser(Frame owner, boolean selectStyles)
  {
    super(owner, "Font Chooser", true);
    _selectStyles = selectStyles;
    createUserInterface();
  }

  /**
   * ctor specifying the parent dialog.
   *
   * @param owner Parent frame.
   */
  public FontChooser(Dialog owner)
  {
    super(owner, "Font Chooser", true);
    _selectStyles = true;
    createUserInterface();
  }

  /**
   * ctor specifying the parent dialog and whether styles can be selected.
   *
   * @param owner Parent frame.
   * @param selectStyles  If <TT>true</TT> bold and italic checkboxes displayed.
   */
  public FontChooser(Dialog owner, boolean selectStyles)
  {
    super(owner, "Font Chooser", true);
    _selectStyles = selectStyles;
    createUserInterface();
  }

  /**
   * Component is being added to its parent.
   */
  public void addNotify()
  {
    super.addNotify();
    if (_previewUpdater == null)
    {
      _previewUpdater = new PreviewLabelUpdater();
      _fontNamesCmb.addActionListener(_previewUpdater);
      _fontSizesCmb.addActionListener(_previewUpdater);
      _boldChk.addActionListener(_previewUpdater);
      _italicChk.addActionListener(_previewUpdater);
    }
  }

  /**
   * Component is being removed from its parent.
   */
  public void removeNotify()
  {
    super.removeNotify();
    if (_previewUpdater != null)
    {
      _fontNamesCmb.removeActionListener(_previewUpdater);
      _fontSizesCmb.removeActionListener(_previewUpdater);
      _boldChk.removeActionListener(_previewUpdater);
      _italicChk.removeActionListener(_previewUpdater);
      _previewUpdater = null;
    }
  }

  public Font showDialog()
  {
    return showDialog(null);
  }

  /**
   * Show dialog defaulting to the passed font.
   *
   * @param font  The font to default to.
   */
  public Font showDialog(Font font)
  {
    if (font != null)
    {
      _fontNamesCmb.setSelectedItem(font.getName());
      _fontSizesCmb.setSelectedItem("" + font.getSize());
      _boldChk.setSelected(_selectStyles && font.isBold());
      _italicChk.setSelected(_selectStyles && font.isItalic());
    }
    else
    {
      _fontNamesCmb.setSelectedIndex(0);
      _fontSizesCmb.setSelectedIndex(0);
      _boldChk.setSelected(false);
      _italicChk.setSelected(false);
    }
    setupPreviewLabel();
    setVisible(true);
    return _font;
  }

  public Font getSelectedFont()
  {
    return _font;
  }

  protected void setupFontFromDialog()
  {
    int size = 12;
    try
    {
      size = Integer.parseInt((String)_fontSizesCmb.getSelectedItem());
    }
    catch (Exception ignore)
    {
      // Ignore.
    }
    FontInfo fi = new FontInfo();
    fi.setFamily((String)_fontNamesCmb.getSelectedItem());
    fi.setSize(size);
    fi.setIsBold(_boldChk.isSelected());
    fi.setIsItalic(_italicChk.isSelected());
    _font = fi.createFont();
  }

  private void createUserInterface()
  {
    final JPanel content = new JPanel(new GridBagLayout());
    final GridBagConstraints gbc = new GridBagConstraints();

    setContentPane(content);
    content.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

    gbc.anchor = GridBagConstraints.WEST;
    gbc.insets = new Insets(2, 2, 2, 2);
    gbc.fill = GridBagConstraints.HORIZONTAL;

    gbc.gridx = gbc.gridy = 0;
    content.add(new JLabel("Font"), gbc);

    ++gbc.gridx;
    content.add(new JLabel("Size"), gbc);

    if (_selectStyles)
    {
      ++gbc.gridx;
      content.add(new JLabel("Style"), gbc);
    }

    ++gbc.gridy;
    gbc.gridx = 0;
    _fontNamesCmb = new JComboBox(GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames());
    content.add(_fontNamesCmb, gbc);

    ++gbc.gridx;
    _fontSizesCmb.setEditable(true);
    content.add(_fontSizesCmb, gbc);

    if (_selectStyles)
    {
      ++gbc.gridx;
      content.add(_boldChk, gbc);
      ++gbc.gridy;
      content.add(_italicChk, gbc);
    }

    gbc.gridx = 0;
    ++gbc.gridy;
    gbc.gridwidth = GridBagConstraints.REMAINDER;
    gbc.fill = GridBagConstraints.BOTH;
    gbc.anchor = GridBagConstraints.CENTER;
    content.add(createPreviewPanel(), gbc);

    ++gbc.gridy;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    content.add(createButtonsPanel(), gbc);

    pack();
    setResizable(true);
  }

  private JPanel createPreviewPanel()
  {
    final JPanel pnl = new JPanel(new BorderLayout());
    pnl.setBorder(BorderFactory.createTitledBorder("PreviewTitle"));
    Dimension prefSize = _previewLbl.getPreferredSize();
    prefSize.height = 50;
    _previewLbl.setPreferredSize(prefSize);
    pnl.add(_previewLbl, BorderLayout.CENTER);
    setupPreviewLabel();

    return pnl;
  }

  private JPanel createButtonsPanel()
  {
    JPanel pnl = new JPanel();

    JButton okBtn = new JButton("OK");
    okBtn.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent evt)
      {
        setupFontFromDialog();
        dispose();
      }
    });
    JButton cancelBtn = new JButton("Cancel");
    cancelBtn.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent evt)
      {
        FontChooser.this._font = null;
        dispose();
      }
    });

    pnl.add(okBtn);
    pnl.add(cancelBtn);

    getRootPane().setDefaultButton(okBtn);

    return pnl;
  }

  private void setupPreviewLabel()
  {
    setupFontFromDialog();
    _previewLbl.setFont(_font);
  }

  private final class PreviewLabelUpdater implements ActionListener
  {
    public void actionPerformed(ActionEvent evt)
    {
      setupPreviewLabel();
    }
  }
}


/*
 * Copyright (C) 2001-2003 Colin Bell
 * colbell@users.sourceforge.net
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

 class FontInfo implements Cloneable, Serializable
{
    private static final long serialVersionUID = 1L;

    public interface IPropertyNames
  {
    String FAMILY = "family";
    String IS_BOLD = "isBold";
    String IS_ITALIC = "isItalic";
    String SIZE = "size";
  }

  private static String DEFAULT_FAMILY = "Monospaced";

  private String _familyName;
  private boolean _isBold;
  private boolean _isItalic;
  private int _size;

  public FontInfo()
  {
    super();
    setFamily(DEFAULT_FAMILY);
    setSize(12);
  }

  public FontInfo(Font font)
  {
    super();
    if (font == null)
    {
      throw new IllegalArgumentException("Null Font passed");
    }
    setFont(font);
  }

  /**
   * Return a copy of this object.
   */
  public Object clone()
  {
    try
    {
      return super.clone();
    }
    catch (CloneNotSupportedException ex)
    {
      throw new InternalError(ex.getMessage()); // Impossible.
    }
  }

  public String getFamily()
  {
    return _familyName;
  }

  public void setFamily(String value)
  {
    _familyName = value != null ? value : DEFAULT_FAMILY;
  }

  public boolean isBold()
  {
    return _isBold;
  }

  public void setIsBold(boolean value)
  {
    _isBold = value;
  }

  public boolean isItalic()
  {
    return _isItalic;
  }

  public void setIsItalic(boolean value)
  {
    _isItalic = value;
  }

  public int getSize()
  {
    return _size;
  }

  public void setSize(int value)
  {
    _size = value;
  }

  public void setFont(Font font) throws IllegalArgumentException
  {
    if (font == null)
    {
      throw new IllegalArgumentException("Null Font passed");
    }
    _familyName = font.getFamily();
    _isBold = font.isBold();
    _isItalic = font.isItalic();
    _size = font.getSize();
  }

  public boolean doesFontMatch(Font font)
  {
    if (font == null)
    {
      return false;
    }
    return font.getFamily().equals(_familyName)
      && font.getSize() == getSize()
      && font.getStyle() == generateStyle();
  }

  public int generateStyle()
  {
    int style = 0;
    if (!_isBold && !_isItalic)
    {
      style = Font.PLAIN;
    }
    else
    {
      if (_isBold)
      {
        style |= Font.BOLD;
      }
      if (_isItalic)
      {
        style |= Font.ITALIC;
      }
    }
    return style;
  }

  public Font createFont()
  {
    return new Font(_familyName, generateStyle(), _size);
  }

  // i18n ? What is this used for?
  public String toString()
  {
    StringBuffer buf = new StringBuffer();
    buf.append(_familyName).append(", " + _size);
    if (_isBold)
    {
      buf.append(", bold");
    }
    if (_isItalic)
    {
      buf.append(", italic");
    }
    return buf.toString();
  }

    /**
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        final int PRIME = 31;
        int result = 1;
        result = PRIME * result + ((_familyName == null) ? 0 : _familyName.hashCode());
        result = PRIME * result + (_isBold ? 1231 : 1237);
        result = PRIME * result + (_isItalic ? 1231 : 1237);
        result = PRIME * result + _size;
        return result;
    }

    /**
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        final FontInfo other = (FontInfo) obj;
        if (_familyName == null) {
            if (other._familyName != null)
                return false;
        } else if (!_familyName.equals(other._familyName))
            return false;
        if (_isBold != other._isBold)
            return false;
        if (_isItalic != other._isItalic)
            return false;
        if (_size != other._size)
            return false;
        return true;
    }
}








14.74.JDialog
14.74.1.Dialog Introduction
14.74.2.A Simple Modal DialogA Simple Modal Dialog
14.74.3.JDialog is specify that pressing the Escape key cancels the dialog.JDialog is specify that pressing the Escape key cancels the dialog.
14.74.4.Address DialogAddress Dialog
14.74.5.Set Default Close Operation for Dialog
14.74.6.Extending JDialog
14.74.7.extends JDialog to create your own dialog
14.74.8.The base class for standard dialogs.
14.74.9.A dialog that presents the user with a sequence of steps for completing a task.
14.74.10.Positions the specified dialog at a position relative to its parent.
14.74.11.A dialog allow selection and a font and its associated info.
14.74.12.Font Chooser extends javax.swing.JDialog
14.74.13.FontChooser by Noah w
14.74.14.Dialog Panel