| /* 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.Rectangle; |
| 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 |
| { |
| // Update font metrics. |
| updateMetrics(); |
| |
| // Get echo character. |
| char ch = getEchoChar(); |
| |
| // Set color for selected text. |
| g.setColor(selectedColor); |
| g.setColor(Color.BLACK); |
| |
| // Draw echo character using drawEchoCharacter() method. |
| for (int index = p0; index < p1; ++index) |
| x = drawEchoCharacter(g, x, y, ch); |
| return x; |
| } |
| |
| /** |
| * Draws unselected text at a given position. |
| * |
| * @param g the <code>Graphics</code> object to draw to |
| * @param x the x-position of the start of the baseline |
| * @param y the y-position of the start of the baseline |
| * @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 |
| { |
| // Update font metrics. |
| updateMetrics(); |
| |
| // Get echo character. |
| char ch = getEchoChar(); |
| |
| // Set color for unselected text. |
| g.setColor(unselectedColor); |
| g.setColor(Color.BLACK); |
| |
| // Draw echo character using drawEchoCharacter() method. |
| for (int index = p0; index < p1; ++index) |
| x = drawEchoCharacter(g, x, y, ch); |
| return x; |
| } |
| |
| /** |
| * 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. |
| * |
| * This method is overridden to provide a correct mapping with respect to the |
| * echo char and not to the real content. |
| * |
| * @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 |
| { |
| Shape newAlloc = adjustAllocation(a); |
| |
| // Ensure metrics are up-to-date. |
| updateMetrics(); |
| |
| // Get rectangle of the line containing position. |
| int lineIndex = getElement().getElementIndex(pos); |
| Rectangle rect = lineToRect(newAlloc, lineIndex); |
| |
| // Get the rectangle for position. |
| Element line = getElement().getElement(lineIndex); |
| int lineStart = line.getStartOffset(); |
| Segment segment = getLineBuffer(); |
| segment.array = new char[pos - lineStart]; |
| char echoChar = getEchoChar(); |
| for (int i = 0; i < segment.array.length; ++i) |
| segment.array[i] = echoChar; |
| segment.offset = 0; |
| segment.count = segment.array.length; |
| |
| int xoffset = Utilities.getTabbedTextWidth(segment, metrics, rect.x, |
| this, lineStart); |
| |
| // Calc the real rectangle. |
| rect.x += xoffset; |
| rect.width = 1; |
| rect.height = metrics.getHeight(); |
| |
| return rect; |
| } |
| |
| /** |
| * 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) |
| { |
| // FIXME: This only provides a view->model mapping for the real text |
| // content and does not respect the echo char. |
| return super.viewToModel(fx, fy, a, bias); |
| } |
| } |