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Diffstat (limited to 'libjava/classpath/javax/swing/text/PasswordView.java')
| -rw-r--r-- | libjava/classpath/javax/swing/text/PasswordView.java | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/libjava/classpath/javax/swing/text/PasswordView.java b/libjava/classpath/javax/swing/text/PasswordView.java new file mode 100644 index 000000000..62b141932 --- /dev/null +++ b/libjava/classpath/javax/swing/text/PasswordView.java @@ -0,0 +1,254 @@ +/* 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); + } +} |