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/* PasswordView.java --

 Copyright (C) 2004 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.text;

import java.awt.Color;

import java.awt.FontMetrics;

import java.awt.Graphics;

import java.awt.Shape;

import javax.swing.JPasswordField;

public class PasswordView

  extends FieldView

{

  /**

   * Buffer for putting the echo char into it and

   * then using it to draw it into the view.

   */

  private char[] oneCharBuffer = new char[1];

  public PasswordView(Element elem)

  {

    super(elem);

  }

  /**

   * Draws one echo character at a given position.

   *

   * @param g the <code>Graphics</code> object to draw to

   * @param x the x-position

   * @param y the y-position

   * @param ch the echo character

   *

   * @return the next x position right of the drawn character

   */

  protected int drawEchoCharacter(Graphics g, int x, int y, char ch)

  {

    // Update font metrics.

    updateMetrics();

    // Draw character.

    oneCharBuffer[0] = ch;

    g.drawChars(oneCharBuffer, 0, 1, x, y);

    // Return new x position right of drawn character.

    return x + metrics.charWidth(ch);

  }

  private char getEchoChar()

  {

    char ch = ((JPasswordField) getContainer()).getEchoChar();

    if (ch == 0)

      ch = '*';

    return ch;

  }

  /**

   * Draws selected text at a given position.

   *

   * @param g the <code>Graphics</code> object to draw to

   * @param x the x-position

   * @param y the y-position

   * @param p0 the position of the first character to draw

   * @param p1 the position of the first character not to draw

   *

   * @return the next x position right of the drawn character

   */

  protected int drawSelectedText(Graphics g, int x, int y, int p0, int p1)

    throws BadLocationException

  {

    // FIXME: Throw BadLocationException somehow.

    // Update font metrics.

    updateMetrics();

    // Get echo character.

    char ch = getEchoChar();

    // Set color for selected text.

    g.setColor(selectedColor);

    g.setColor(Color.BLACK);

    // Initialize buffer for faster drawing of all characters.

    int len = p1 - p0;

    char[] buffer = new char[len];

    for (int index = 0; index < len; ++index)

      buffer[index] = ch;

    // Draw echo charaters.

    g.drawChars(buffer, 0, len, x, y);

    // Return new x position right of all drawn characters.

    return x + len * metrics.charWidth(ch);

  }

  /**

   * Draws unselected text at a given position.

   *

   * @param g the <code>Graphics</code> object to draw to

   * @param x the x-position

   * @param y the y-position

   * @param p0 the position of the first character to draw

   * @param p1 the position of the first character not to draw

   *

   * @return the next x position right of the drawn character

   */

  protected int drawUnselectedText(Graphics g, int x, int y, int p0, int p1)

    throws BadLocationException

  {

    // FIXME: Throw BadLocationException somehow.

    // Update font metrics.

    updateMetrics();

    // Get echo character.

    char ch = getEchoChar();

    Segment segment = new Segment();

    // Set color for unselected text.

    g.setColor(unselectedColor);

    g.setColor(Color.BLACK);

    // Initialize buffer for faster drawing of all characters.

    p1--;

    getDocument().getText(p0, p1 - p0, segment);

    int len = segment.toString().length();

    char[] buffer = new char[len];

    for (int index = 0; index < len; ++index)

      buffer[index] = ch;

    y += getPreferredSpan(Y_AXIS)/2;

    // Draw echo charaters.

    g.drawChars(buffer, 0, len, x, y);

    // Return new x position right of all drawn characters.

    return x + (len * metrics.charWidth(ch));

  }

  /**

   * Determines the preferred span for this view along an axis.

   *

   * @param axis to get the preferred span of

   * @return the preferred span of the axis

   */

  public float getPreferredSpan(int axis)

  {

    if (axis != X_AXIS && axis != Y_AXIS)

      throw new IllegalArgumentException();

    FontMetrics fm = getFontMetrics();

    if (axis == Y_AXIS)

        return fm.getHeight();

    String text;

    Element elem = getElement();

    try

      {

        text = elem.getDocument().getText(elem.getStartOffset(),

                                          elem.getEndOffset());

      }

    catch (BadLocationException e)

      {

        // This should never happen.

        text = "";

      }

    return fm.stringWidth(text);

  }

  /**

   * Provides a mapping from the document model coordinate space to the

   * coordinate space of the view mapped to it.

   *

   * @param pos - the position to convert >= 0

   * @param a - the allocated region to render into

   * @param b - typesafe enumeration to indicate bias to a position in the model.

   * @return the bounding box of the given position

   * @throws BadLocationException if the given position does not

   * represent a valid location in the associated document

   */

  public Shape modelToView(int pos, Shape a, Position.Bias b)

    throws BadLocationException

  {

    return super.modelToView(pos, a, b);

  }

  /**

   * Provides a mapping from the view coordinate space to the logical

   * coordinate space of the model.

   *

   * @param fx - the X coordinate >= 0.0f

   * @param fy - the Y coordinate >= 0.0f

   * @param a - the allocated region to render into

   * @param bias - typesafe enumeration to indicate bias to a position in the model.

   * @return the location within the model that best represents

   * the given point in the view

   *

   */

  public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias)

  {

    return super.viewToModel(fx, fy, a, bias);

  }

}