Java javax.swing.text Class PasswordView（JDK8）

Constructor Detail

• PasswordView

  public PasswordView(Element elem)

  Constructs a new view wrapped on an element.

  Parameters:

  elem - the element

Method Detail

• drawUnselectedText

  protected int drawUnselectedText(Graphics g,
                                   int x,
                                   int y,
                                   int p0,
                                   int p1)
                            throws BadLocationException

  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().

  Overrides:

  drawUnselectedText in class PlainView

  Parameters:

  g - the graphics context

  x - the starting X coordinate >= 0

  y - the starting Y coordinate >= 0

  p0 - the starting offset in the model >= 0

  p1 - the ending offset in the model >= p0

  Returns:

  the X location of the end of the range >= 0

  Throws:

  BadLocationException - if p0 or p1 are out of range

• drawSelectedText

  protected int drawSelectedText(Graphics g,
                                 int x,
                                 int y,
                                 int p0,
                                 int p1)
                          throws BadLocationException

  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.

  Overrides:

  drawSelectedText in class PlainView

  Parameters:

  g - the graphics context

  x - the starting X coordinate >= 0

  y - the starting Y coordinate >= 0

  p0 - the starting offset in the model >= 0

  p1 - the ending offset in the model >= p0

  Returns:

  the X location of the end of the range >= 0

  Throws:

  BadLocationException - if p0 or p1 are out of range

• drawEchoCharacter

  protected int drawEchoCharacter(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.

  Parameters:

  g - the graphics context

  x - the starting X coordinate >= 0

  y - the starting Y coordinate >= 0

  c - the echo character

  Returns:

  the updated X position >= 0

• modelToView

  public Shape modelToView(int pos,
                           Shape a,
                           Position.Bias b)
                    throws BadLocationException

  Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.

  Overrides:

  modelToView in class FieldView

  Parameters:

  pos - the position to convert >= 0

  a - the allocated region to render into

  b - the bias toward the previous character or the next character represented by the offset, in case the position is a boundary of two views; b will have one of these values:

  • Position.Bias.Forward
  • Position.Bias.Backward

  Returns:

  the bounding box of the given position

  Throws:

  BadLocationException - if the given position does not represent a valid location in the associated document

  See Also:

  View.modelToView(int, java.awt.Shape, javax.swing.text.Position.Bias)

• viewToModel

  public int viewToModel(float fx,
                         float fy,
                         Shape a,
                         Position.Bias[] bias)

  Provides a mapping from the view coordinate space to the logical coordinate space of the model.

  Overrides:

  viewToModel in class FieldView

  Parameters:

  fx - the X coordinate >= 0.0f

  fy - the Y coordinate >= 0.0f

  a - the allocated region to render into

  Returns:

  the location within the model that best represents the given point in the view

  See Also:

  View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[])

• getPreferredSpan

  public float getPreferredSpan(int axis)

  Determines the preferred span for this view along an axis.

  Overrides:

  getPreferredSpan in class FieldView

  Parameters:

  axis - may be either View.X_AXIS or View.Y_AXIS

  Returns:

  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.

  See Also:

  View.getPreferredSpan(int)