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jlechner |
/* PasswordView.java --
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.text;
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import java.awt.Color;
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import java.awt.FontMetrics;
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import java.awt.Graphics;
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import java.awt.Shape;
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import javax.swing.JPasswordField;
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public class PasswordView
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extends FieldView
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{
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/**
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* Buffer for putting the echo char into it and
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* then using it to draw it into the view.
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*/
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private char[] oneCharBuffer = new char[1];
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public PasswordView(Element elem)
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{
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super(elem);
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}
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/**
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* Draws one echo character at a given position.
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*
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* @param g the <code>Graphics</code> object to draw to
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* @param x the x-position
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* @param y the y-position
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* @param ch the echo character
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*
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* @return the next x position right of the drawn character
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*/
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protected int drawEchoCharacter(Graphics g, int x, int y, char ch)
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{
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// Update font metrics.
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updateMetrics();
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// Draw character.
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oneCharBuffer[0] = ch;
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g.drawChars(oneCharBuffer, 0, 1, x, y);
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// Return new x position right of drawn character.
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return x + metrics.charWidth(ch);
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}
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private char getEchoChar()
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{
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char ch = ((JPasswordField) getContainer()).getEchoChar();
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if (ch == 0)
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ch = '*';
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return ch;
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}
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/**
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* Draws selected text at a given position.
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*
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* @param g the <code>Graphics</code> object to draw to
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* @param x the x-position
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* @param y the y-position
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* @param p0 the position of the first character to draw
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* @param p1 the position of the first character not to draw
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*
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* @return the next x position right of the drawn character
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*/
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protected int drawSelectedText(Graphics g, int x, int y, int p0, int p1)
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throws BadLocationException
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{
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// FIXME: Throw BadLocationException somehow.
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// Update font metrics.
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updateMetrics();
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// Get echo character.
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char ch = getEchoChar();
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// Set color for selected text.
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g.setColor(selectedColor);
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g.setColor(Color.BLACK);
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// Initialize buffer for faster drawing of all characters.
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int len = p1 - p0;
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char[] buffer = new char[len];
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for (int index = 0; index < len; ++index)
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buffer[index] = ch;
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// Draw echo charaters.
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g.drawChars(buffer, 0, len, x, y);
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// Return new x position right of all drawn characters.
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return x + len * metrics.charWidth(ch);
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}
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/**
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* Draws unselected text at a given position.
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*
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* @param g the <code>Graphics</code> object to draw to
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* @param x the x-position
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* @param y the y-position
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* @param p0 the position of the first character to draw
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* @param p1 the position of the first character not to draw
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*
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* @return the next x position right of the drawn character
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*/
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protected int drawUnselectedText(Graphics g, int x, int y, int p0, int p1)
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throws BadLocationException
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{
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// FIXME: Throw BadLocationException somehow.
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// Update font metrics.
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updateMetrics();
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// Get echo character.
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char ch = getEchoChar();
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Segment segment = new Segment();
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// Set color for unselected text.
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g.setColor(unselectedColor);
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g.setColor(Color.BLACK);
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// Initialize buffer for faster drawing of all characters.
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p1--;
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getDocument().getText(p0, p1 - p0, segment);
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int len = segment.toString().length();
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char[] buffer = new char[len];
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for (int index = 0; index < len; ++index)
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buffer[index] = ch;
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y += getPreferredSpan(Y_AXIS)/2;
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// Draw echo charaters.
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g.drawChars(buffer, 0, len, x, y);
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// Return new x position right of all drawn characters.
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return x + (len * metrics.charWidth(ch));
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}
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/**
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* Determines the preferred span for this view along an axis.
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*
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* @param axis to get the preferred span of
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* @return the preferred span of the axis
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*/
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public float getPreferredSpan(int axis)
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{
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if (axis != X_AXIS && axis != Y_AXIS)
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throw new IllegalArgumentException();
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FontMetrics fm = getFontMetrics();
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if (axis == Y_AXIS)
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return fm.getHeight();
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String text;
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Element elem = getElement();
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try
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{
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text = elem.getDocument().getText(elem.getStartOffset(),
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elem.getEndOffset());
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}
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catch (BadLocationException e)
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{
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// This should never happen.
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text = "";
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}
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return fm.stringWidth(text);
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}
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/**
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* Provides a mapping from the document model coordinate space to the
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* coordinate space of the view mapped to it.
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*
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* @param pos - the position to convert >= 0
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* @param a - the allocated region to render into
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* @param b - typesafe enumeration to indicate bias to a position in the model.
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* @return the bounding box of the given position
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* @throws BadLocationException if the given position does not
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* represent a valid location in the associated document
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*/
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public Shape modelToView(int pos, Shape a, Position.Bias b)
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throws BadLocationException
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{
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return super.modelToView(pos, a, b);
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}
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/**
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* Provides a mapping from the view coordinate space to the logical
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* coordinate space of the model.
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*
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* @param fx - the X coordinate >= 0.0f
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* @param fy - the Y coordinate >= 0.0f
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* @param a - the allocated region to render into
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* @param bias - typesafe enumeration to indicate bias to a position in the model.
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* @return the location within the model that best represents
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* the given point in the view
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*
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*/
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public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias)
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{
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return super.viewToModel(fx, fy, a, bias);
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}
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}
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