/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package javax.swing.text;
import sun.swing.
SwingUtilities2;
import java.awt.*;
import javax.swing.
JPasswordField;
/**
* Implements a View suitable for use in JPasswordField
* UI implementations. This is basically a field ui that
* renders its contents as the echo character specified
* in the associated component (if it can narrow the
* component to a JPasswordField).
*
* @author Timothy Prinzing
* @see View
*/
public class
PasswordView extends
FieldView {
/**
* Constructs a new view wrapped on an element.
*
* @param elem the element
*/
public
PasswordView(
Element elem) {
super(
elem);
}
/**
* Renders the given range in the model as normal unselected
* text. This sets the foreground color and echos the characters
* using the value returned by getEchoChar().
*
* @param g the graphics context
* @param x the starting X coordinate >= 0
* @param y the starting Y coordinate >= 0
* @param p0 the starting offset in the model >= 0
* @param p1 the ending offset in the model >= p0
* @return the X location of the end of the range >= 0
* @exception BadLocationException if p0 or p1 are out of range
*/
protected int
drawUnselectedText(
Graphics g, int
x, int
y,
int
p0, int
p1) throws
BadLocationException {
Container c =
getContainer();
if (
c instanceof
JPasswordField) {
JPasswordField f = (
JPasswordField)
c;
if (!
f.
echoCharIsSet()) {
return super.drawUnselectedText(
g,
x,
y,
p0,
p1);
}
if (
f.
isEnabled()) {
g.
setColor(
f.
getForeground());
}
else {
g.
setColor(
f.
getDisabledTextColor());
}
char
echoChar =
f.
getEchoChar();
int
n =
p1 -
p0;
for (int
i = 0;
i <
n;
i++) {
x =
drawEchoCharacter(
g,
x,
y,
echoChar);
}
}
return
x;
}
/**
* Renders the given range in the model as selected text. This
* is implemented to render the text in the color specified in
* the hosting component. It assumes the highlighter will render
* the selected background. Uses the result of getEchoChar() to
* display the characters.
*
* @param g the graphics context
* @param x the starting X coordinate >= 0
* @param y the starting Y coordinate >= 0
* @param p0 the starting offset in the model >= 0
* @param p1 the ending offset in the model >= p0
* @return the X location of the end of the range >= 0
* @exception BadLocationException if p0 or p1 are out of range
*/
protected int
drawSelectedText(
Graphics g, int
x,
int
y, int
p0, int
p1) throws
BadLocationException {
g.
setColor(
selected);
Container c =
getContainer();
if (
c instanceof
JPasswordField) {
JPasswordField f = (
JPasswordField)
c;
if (!
f.
echoCharIsSet()) {
return super.drawSelectedText(
g,
x,
y,
p0,
p1);
}
char
echoChar =
f.
getEchoChar();
int
n =
p1 -
p0;
for (int
i = 0;
i <
n;
i++) {
x =
drawEchoCharacter(
g,
x,
y,
echoChar);
}
}
return
x;
}
/**
* Renders the echo character, or whatever graphic should be used
* to display the password characters. The color in the Graphics
* object is set to the appropriate foreground color for selected
* or unselected text.
*
* @param g the graphics context
* @param x the starting X coordinate >= 0
* @param y the starting Y coordinate >= 0
* @param c the echo character
* @return the updated X position >= 0
*/
protected int
drawEchoCharacter(
Graphics g, int
x, int
y, char
c) {
ONE[0] =
c;
SwingUtilities2.
drawChars(
Utilities.
getJComponent(this),
g,
ONE, 0, 1,
x,
y);
return
x +
g.
getFontMetrics().
charWidth(
c);
}
/**
* 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
* @return the bounding box of the given position
* @exception BadLocationException if the given position does not
* represent a valid location in the associated document
* @see View#modelToView
*/
public
Shape modelToView(int
pos,
Shape a,
Position.
Bias b) throws
BadLocationException {
Container c =
getContainer();
if (
c instanceof
JPasswordField) {
JPasswordField f = (
JPasswordField)
c;
if (!
f.
echoCharIsSet()) {
return super.modelToView(
pos,
a,
b);
}
char
echoChar =
f.
getEchoChar();
FontMetrics m =
f.
getFontMetrics(
f.
getFont());
Rectangle alloc =
adjustAllocation(
a).
getBounds();
int
dx = (
pos -
getStartOffset()) *
m.
charWidth(
echoChar);
alloc.
x +=
dx;
alloc.
width = 1;
return
alloc;
}
return null;
}
/**
* 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
* @return the location within the model that best represents the
* given point in the view
* @see View#viewToModel
*/
public int
viewToModel(float
fx, float
fy,
Shape a,
Position.
Bias[]
bias) {
bias[0] =
Position.
Bias.
Forward;
int
n = 0;
Container c =
getContainer();
if (
c instanceof
JPasswordField) {
JPasswordField f = (
JPasswordField)
c;
if (!
f.
echoCharIsSet()) {
return super.viewToModel(
fx,
fy,
a,
bias);
}
char
echoChar =
f.
getEchoChar();
int
charWidth =
f.
getFontMetrics(
f.
getFont()).
charWidth(
echoChar);
a =
adjustAllocation(
a);
Rectangle alloc = (
a instanceof
Rectangle) ? (
Rectangle)
a :
a.
getBounds();
n = (
charWidth > 0 ?
((int)
fx -
alloc.
x) /
charWidth :
Integer.
MAX_VALUE);
if (
n < 0) {
n = 0;
}
else if (
n > (
getStartOffset() +
getDocument().
getLength())) {
n =
getDocument().
getLength() -
getStartOffset();
}
}
return
getStartOffset() +
n;
}
/**
* Determines the preferred span for this view along an
* axis.
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the span the view would like to be rendered into >= 0.
* Typically the view is told to render into the span
* that is returned, although there is no guarantee.
* The parent may choose to resize or break the view.
*/
public float
getPreferredSpan(int
axis) {
switch (
axis) {
case
View.
X_AXIS:
Container c =
getContainer();
if (
c instanceof
JPasswordField) {
JPasswordField f = (
JPasswordField)
c;
if (
f.
echoCharIsSet()) {
char
echoChar =
f.
getEchoChar();
FontMetrics m =
f.
getFontMetrics(
f.
getFont());
Document doc =
getDocument();
return
m.
charWidth(
echoChar) *
getDocument().
getLength();
}
}
}
return super.getPreferredSpan(
axis);
}
static char[]
ONE = new char[1];
}