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+/* JTextField.java --
+   Copyright (C) 2002, 2004, 2005, 2006  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing;
+
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Insets;
+import java.awt.Rectangle;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+
+import javax.accessibility.AccessibleContext;
+import javax.accessibility.AccessibleStateSet;
+import javax.swing.text.Document;
+import javax.swing.text.JTextComponent;
+import javax.swing.text.PlainDocument;
+import javax.swing.text.TextAction;
+
+public class JTextField extends JTextComponent
+  implements SwingConstants
+{
+  /**
+   * AccessibleJTextField
+   */
+  protected class AccessibleJTextField extends AccessibleJTextComponent
+  {
+    private static final long serialVersionUID = 8255147276740453036L;
+
+    /**
+     * Constructor AccessibleJTextField
+     */
+    protected AccessibleJTextField()
+    {
+      super();
+    }
+
+    /**
+     * Returns the accessible state of this <code>AccessibleJTextField</code>.
+     *
+     * @return the accessible state of this <code>AccessibleJTextField</code>
+     */
+    public AccessibleStateSet getAccessibleStateSet()
+    {
+      AccessibleStateSet state = super.getAccessibleStateSet();
+      // TODO: Figure out what state must be added here to the super's state.
+      return state;
+    }
+  }
+
+  private static final long serialVersionUID = 353853209832607592L;
+
+  private static final Action[] actions;
+
+  /**
+   * Name of the action that gets sent when the content of the text field
+   * gets accepted.
+   */
+  public static final String notifyAction = "notify-field-accept";
+
+  static
+    {
+      actions = new Action[1];
+      actions[0] = new TextAction(notifyAction)
+      {
+        public void actionPerformed(ActionEvent event)
+        {
+          JTextField textField = (JTextField) event.getSource();
+          textField.fireActionPerformed();
+        }
+      };
+    }
+
+  private int columns;
+  private int align;
+
+  /** @since 1.3 */
+  private Action action;
+
+  /** @since 1.3 */
+  private String actionCommand;
+
+  private PropertyChangeListener actionPropertyChangeListener;
+
+  /**
+   * The horizontal visibility of the textfield.
+   */
+  private BoundedRangeModel horizontalVisibility;
+
+  /**
+   * Creates a new instance of <code>JTextField</code>.
+   */
+  public JTextField()
+  {
+    this(null, null, 0);
+  }
+
+  /**
+   * Creates a new instance of <code>JTextField</code>.
+   *
+   * @param text the initial text
+   */
+  public JTextField(String text)
+  {
+    this(null, text, 0);
+  }
+
+  /**
+   * Creates a new instance of <code>JTextField</code>.
+   *
+   * @param columns the number of columns
+   *
+   * @exception IllegalArgumentException if columns %lt; 0
+   */
+  public JTextField(int columns)
+  {
+    this(null, null, columns);
+  }
+
+  /**
+   * Creates a new instance of <code>JTextField</code>.
+   *
+   * @param text the initial text
+   * @param columns the number of columns
+   *
+   * @exception IllegalArgumentException if columns %lt; 0
+   */
+  public JTextField(String text, int columns)
+  {
+    this(null, text, columns);
+  }
+
+  /**
+   * Creates a new instance of <code>JTextField</code>.
+   *
+   * @param doc the document to use
+   * @param text the initial text
+   * @param columns the number of columns
+   *
+   * @exception IllegalArgumentException if columns %lt; 0
+   */
+  public JTextField(Document doc, String text, int columns)
+  {
+    if (columns < 0)
+      throw new IllegalArgumentException();
+
+    this.columns = columns;
+
+    // Initialize the horizontal visibility model.
+    horizontalVisibility = new DefaultBoundedRangeModel();
+
+    setDocument(doc == null ? createDefaultModel() : doc);
+
+    if (text != null)
+      setText(text);
+
+    // default value for alignment
+    align = LEADING;
+  }
+
+  /**
+   * Creates the default model for this text field.
+   * This implementation returns an instance of <code>PlainDocument</code>.
+   *
+   * @return a new instance of the default model
+   */
+  protected Document createDefaultModel()
+  {
+    return new PlainDocument();
+  }
+
+  /**
+   * Sets the document to be used for this JTextField.
+   *
+   * This sets the document property <code>filterNewlines</code> to
+   * <code>true</code> and then calls the super behaviour to setup a view and
+   * revalidate the text field.
+   *
+   * @param doc the document to set
+   */
+  public void setDocument(Document doc)
+  {
+    doc.putProperty("filterNewlines", Boolean.TRUE);
+    super.setDocument(doc);
+  }
+
+  /**
+   * Returns the class ID for the UI.
+   *
+   * @return "TextFieldUI";
+   */
+  public String getUIClassID()
+  {
+    return "TextFieldUI";
+  }
+
+  /**
+   * Adds a new listener object to this text field.
+   *
+   * @param listener the listener to add
+   */
+  public void addActionListener(ActionListener listener)
+  {
+    listenerList.add(ActionListener.class, listener);
+  }
+
+  /**
+   * Removes a listener object from this text field.
+   *
+   * @param listener the listener to remove
+   */
+  public void removeActionListener(ActionListener listener)
+  {
+    listenerList.remove(ActionListener.class, listener);
+  }
+
+  /**
+   * Returns all registered <code>ActionListener</code> objects.
+   *
+   * @return an array of listeners
+   *
+   * @since 1.4
+   */
+  public ActionListener[] getActionListeners()
+  {
+    return (ActionListener[]) getListeners(ActionListener.class);
+  }
+
+  /**
+   * Sends an action event to all registered
+   * <code>ActionListener</code> objects.
+   */
+  protected void fireActionPerformed()
+  {
+    ActionEvent event = new ActionEvent(this, 0,
+                          actionCommand == null ? getText() : actionCommand);
+    ActionListener[] listeners = getActionListeners();
+
+    for (int index = 0; index < listeners.length; ++index)
+      listeners[index].actionPerformed(event);
+  }
+
+  /**
+   * Returns the number of columns of this text field.
+   *
+   * @return the number of columns
+   */
+  public int getColumns()
+  {
+    return columns;
+  }
+
+  /**
+   * Sets the number of columns and then invalidates the layout.
+   * @param columns the number of columns
+   * @throws IllegalArgumentException if columns < 0
+   */
+  public void setColumns(int columns)
+  {
+    if (columns < 0)
+      throw new IllegalArgumentException();
+
+    this.columns = columns;
+    invalidate();
+    //FIXME: do we need this repaint call?
+    repaint();
+  }
+
+  /**
+   * Returns the horizontal alignment, which is one of: JTextField.LEFT,
+   * JTextField.CENTER, JTextField.RIGHT, JTextField.LEADING,
+   * JTextField.TRAILING.
+   * @return the horizontal alignment
+   */
+  public int getHorizontalAlignment()
+  {
+    return align;
+  }
+
+  /**
+   * Sets the horizontal alignment of the text.  Calls invalidate and repaint
+   * and fires a property change event.
+   * @param newAlign must be one of: JTextField.LEFT, JTextField.CENTER,
+   * JTextField.RIGHT, JTextField.LEADING, JTextField.TRAILING.
+   * @throws IllegalArgumentException if newAlign is not one of the above.
+   */
+  public void setHorizontalAlignment(int newAlign)
+  {
+    //FIXME: should throw an IllegalArgumentException if newAlign is invalid
+    if (align == newAlign)
+      return;
+
+    int oldAlign = align;
+    align = newAlign;
+    firePropertyChange("horizontalAlignment", oldAlign, newAlign);
+    invalidate();
+    repaint();
+  }
+
+  /**
+   * Sets the current font and revalidates so the font will take effect.
+   */
+  public void setFont(Font newFont)
+  {
+    super.setFont(newFont);
+    revalidate();
+  }
+
+  /**
+   * Returns the preferred size.  If there is a non-zero number of columns,
+   * this is the number of columns multiplied by the column width, otherwise
+   * it returns super.getPreferredSize().
+   */
+  public Dimension getPreferredSize()
+  {
+    Dimension size = super.getPreferredSize();
+
+    if (columns != 0)
+      {
+        Insets i = getInsets();
+        size.width = columns * getColumnWidth() + i.left + i.right;
+      }
+
+    return size;
+  }
+
+  /**
+   * Returns the scroll offset in pixels.
+   *
+   * @return the scroll offset
+   */
+  public int getScrollOffset()
+  {
+    return horizontalVisibility.getValue();
+  }
+
+  /**
+   * Sets the scroll offset in pixels.
+   *
+   * @param offset the scroll offset
+   */
+  public void setScrollOffset(int offset)
+  {
+    // Automatically sets to the highest possible value if
+    // offset is bigger than that.
+    horizontalVisibility.setValue(
+                                  Math.min(horizontalVisibility.getMaximum()
+                                           - horizontalVisibility.getExtent(),
+                                           offset));
+
+  }
+
+  /**
+   * Returns the set of Actions that are commands for the editor.
+   * This is the actions supported by this editor plus the actions
+   * of the UI (returned by JTextComponent.getActions()).
+   */
+  public Action[] getActions()
+  {
+    return TextAction.augmentList(super.getActions(), actions);
+  }
+
+  public void postActionEvent()
+  {
+    String command = actionCommand != null ? actionCommand : getText();
+    ActionEvent event = new ActionEvent(this, 0, command);
+    ActionListener[] listeners = getActionListeners();
+
+    for (int index = 0; index < listeners.length; ++index)
+      listeners[index].actionPerformed(event);
+  }
+
+  /**
+   * @since 1.3
+   */
+  public Action getAction()
+  {
+    return action;
+  }
+
+  /**
+   * @since 1.3
+   */
+  public void setAction(Action newAction)
+  {
+    if (action == newAction)
+      return;
+
+    if (action != null)
+      {
+        removeActionListener(action);
+        action.removePropertyChangeListener(actionPropertyChangeListener);
+        actionPropertyChangeListener = null;
+      }
+
+    Action oldAction = action;
+    action = newAction;
+
+    if (action != null)
+      {
+        addActionListener(action);
+        actionPropertyChangeListener = createActionPropertyChangeListener(action);
+        action.addPropertyChangeListener(actionPropertyChangeListener);
+      }
+
+    //FIXME: is this a hack?  The horizontal alignment hasn't changed
+    firePropertyChange("horizontalAlignment", oldAction, newAction);
+  }
+
+  /**
+   * Sets the command string used in action events.
+   * @since 1.3
+   */
+  public void setActionCommand(String command)
+  {
+    actionCommand = command;
+  }
+
+  /**
+   * @since 1.3
+   */
+  protected PropertyChangeListener createActionPropertyChangeListener(Action action)
+  {
+    return new PropertyChangeListener()
+    {
+      public void propertyChange(PropertyChangeEvent event)
+      {
+        // Update properties "action" and "horizontalAlignment".
+        String name = event.getPropertyName();
+
+        if (name.equals("enabled"))
+          {
+            boolean enabled = ((Boolean) event.getNewValue()).booleanValue();
+            JTextField.this.setEnabled(enabled);
+          }
+        else if (name.equals(Action.SHORT_DESCRIPTION))
+          {
+            JTextField.this.setToolTipText((String) event.getNewValue());
+          }
+      }
+    };
+  }
+
+  /**
+   *
+   * @since 1.3
+   */
+  protected void configurePropertiesFromAction(Action action)
+  {
+    if (action != null)
+      {
+        setEnabled(action.isEnabled());
+        setToolTipText((String) action.getValue(Action.SHORT_DESCRIPTION));
+      }
+    else
+      {
+        setEnabled(true);
+        setToolTipText(null);
+      }
+  }
+
+  /**
+   * Returns the column width, which is the width of the character m
+   * for the font in use.
+   * @return the width of the character m for the font in use.
+   */
+  protected int getColumnWidth()
+  {
+    FontMetrics metrics = getToolkit().getFontMetrics(getFont());
+    return metrics.charWidth('m');
+  }
+
+  /**
+   * Returns the accessible context associated with the <code>JTextField</code>.
+   *
+   * @return the accessible context associated with the <code>JTextField</code>
+   */
+  public AccessibleContext getAccessibleContext()
+  {
+    if (accessibleContext == null)
+      accessibleContext = new AccessibleJTextField();
+    return accessibleContext;
+  }
+
+  /**
+   * Returns the bounded range model that describes the horizontal visibility
+   * of the text field in the case when the text does not fit into the
+   * available space. The actual values of this model are managed by the look
+   * and feel implementation.
+   *
+   * @return the bounded range model that describes the horizontal visibility
+   */
+  public BoundedRangeModel getHorizontalVisibility()
+  {
+    return horizontalVisibility;
+  }
+
+  /**
+   * Returns <code>true</code>, unless this is embedded in a
+   * <code>JViewport</code> in which case the viewport takes responsibility of
+   * validating.
+   *
+   * @return <code>true</code>, unless this is embedded in a
+   *         <code>JViewport</code> in which case the viewport takes
+   *         responsibility of validating
+   */
+  public boolean isValidateRoot()
+  {
+    return ! (getParent() instanceof JViewport);
+  }
+
+  public void scrollRectToVisible(Rectangle r)
+  {
+    int v = horizontalVisibility.getValue();
+
+    // The extent value is the inner width of the text field.
+    int e = horizontalVisibility.getExtent();
+    Insets i = getInsets();
+
+    // The x value in the rectangle (usually) denotes the new location
+    // of the caret. We check whether the location lies inside the left or
+    // right border and scroll into the appropriate direction.
+    // The calculation has to be shifted by the BoundedRangeModel's value
+    // because that value was already used to calculate r.x (this happens
+    // as part of a modelToView() call in FieldView).
+    if (r.x < i.left)
+      setScrollOffset(v + r.x - i.left);
+    else if (r.x > e + i.left)
+      setScrollOffset(r.x + v - e - i.left);
+  }
+
+}