File	Doc	Category	Size	Date	Package
PasswordView.java	API Doc	Java SE 5 API	7360	Fri Aug 26 14:58:16 BST 2005	javax.swing.text

PasswordView

• java.lang.Object
  • javax.swing.text.View
    • javax.swing.text.PlainView
      • javax.swing.text.FieldView

Fields Summary
static char[]	ONE

Constructors Summary
public PasswordView(Element elem) Constructs a new view wrapped on an element. param elem the element super(elem);

Methods Summary
protected int	drawEchoCharacter(java.awt.Graphics g, int x, int y, char c) 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 ONE[0] = c; SwingUtilities2.drawChars(Utilities.getJComponent(this), g, ONE, 0, 1, x, y); return x + g.getFontMetrics().charWidth(c);
protected int	drawSelectedText(java.awt.Graphics g, int x, int y, int p0, int p1) 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 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;
protected int	drawUnselectedText(java.awt.Graphics g, int x, int y, int p0, int p1) 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 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;
public float	getPreferredSpan(int axis) 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. 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);
public java.awt.Shape	modelToView(int pos, java.awt.Shape a, javax.swing.text.Position$Bias b) Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it. param pos the position to convert >= 0 param a the allocated region to render into return the bounding box of the given position exception BadLocationException if the given position does not represent a valid location in the associated document see View#modelToView Container c = getContainer(); if (c instanceof JPasswordField) { JPasswordField f = (JPasswordField) c; if (! f.echoCharIsSet()) { return super.modelToView(pos, a, b); } char echoChar = f.getEchoChar(); FontMetrics m = f.getFontMetrics(f.getFont()); Rectangle alloc = adjustAllocation(a).getBounds(); int dx = (pos - getStartOffset()) * m.charWidth(echoChar); alloc.x += dx; alloc.width = 1; return alloc; } return null;
public int	viewToModel(float fx, float fy, java.awt.Shape a, javax.swing.text.Position$Bias[] bias) 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 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(); FontMetrics m = f.getFontMetrics(f.getFont()); a = adjustAllocation(a); Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds(); n = ((int)fx - alloc.x) / m.charWidth(echoChar); if (n < 0) { n = 0; } else if (n > (getStartOffset() + getDocument().getLength())) { n = getDocument().getLength() - getStartOffset(); } } return getStartOffset() + n;