Initial revision

From-SVN: r102074

libjava/classpath/javax/swing/text/PasswordView.java

@@ -0,0 +1,170 @@
+/* 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.Graphics;
+
+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();
+    
+    // Set color for unselected text.
+    g.setColor(unselectedColor);
+    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);
+  }
+}
+