public class

WrappedPlainView

extends BoxView
implements TabExpander
java.lang.Object
   ↳ javax.swing.text.View
     ↳ javax.swing.text.CompositeView
       ↳ javax.swing.text.BoxView
         ↳ javax.swing.text.WrappedPlainView

Class Overview

View of plain text (text with only one font and color) that does line-wrapping. This view expects that its associated element has child elements that represent the lines it should be wrapping. It is implemented as a vertical box that contains logical line views. The logical line views are nested classes that render the logical line as multiple physical line if the logical line is too wide to fit within the allocation. The line views draw upon the outer class for its state to reduce their memory requirements.

The line views do all of their rendering through the drawLine method which in turn does all of its rendering through the drawSelectedText and drawUnselectedText methods. This enables subclasses to easily specialize the rendering without concern for the layout aspects.

See Also

Summary

[Expand]
Inherited Constants
From class javax.swing.text.View
From interface javax.swing.SwingConstants
Public Constructors
WrappedPlainView(Element elem)
Creates a new WrappedPlainView.
WrappedPlainView(Element elem, boolean wordWrap)
Creates a new WrappedPlainView.
Public Methods
void changedUpdate(DocumentEvent e, Shape a, ViewFactory f)
Gives notification from the document that attributes were changed in a location that this view is responsible for.
float getMaximumSpan(int axis)
Determines the maximum span for this view along an axis.
float getMinimumSpan(int axis)
Determines the minimum span for this view along an axis.
float getPreferredSpan(int axis)
Determines the preferred span for this view along an axis.
void insertUpdate(DocumentEvent e, Shape a, ViewFactory f)
Gives notification that something was inserted into the document in a location that this view is responsible for.
float nextTabStop(float x, int tabOffset)
Returns the next tab stop position after a given reference position.
void paint(Graphics g, Shape a)
Renders using the given rendering surface and area on that surface.
void removeUpdate(DocumentEvent e, Shape a, ViewFactory f)
Gives notification that something was removed from the document in a location that this view is responsible for.
void setSize(float width, float height)
Sets the size of the view.
Protected Methods
int calculateBreakPosition(int p0, int p1)
This is called by the nested wrapped line views to determine the break location.
void drawLine(int p0, int p1, Graphics g, int x, int y)
Renders a line of text, suppressing whitespace at the end and expanding any tabs.
int drawSelectedText(Graphics g, int x, int y, int p0, int p1)
Renders the given range in the model as selected text.
int drawUnselectedText(Graphics g, int x, int y, int p0, int p1)
Renders the given range in the model as normal unselected text.
final Segment getLineBuffer()
Gives access to a buffer that can be used to fetch text from the associated document.
int getTabSize()
Returns the tab size set for the document, defaulting to 8.
void loadChildren(ViewFactory f)
Loads all of the children to initialize the view.
[Expand]
Inherited Methods
From class javax.swing.text.BoxView
From class javax.swing.text.CompositeView
From class javax.swing.text.View
From class java.lang.Object
From interface javax.swing.text.TabExpander

Public Constructors

public WrappedPlainView (Element elem)

Creates a new WrappedPlainView. Lines will be wrapped on character boundaries.

Parameters
elem the element underlying the view

public WrappedPlainView (Element elem, boolean wordWrap)

Creates a new WrappedPlainView. Lines can be wrapped on either character or word boundaries depending upon the setting of the wordWrap parameter.

Parameters
elem the element underlying the view
wordWrap should lines be wrapped on word boundaries?

Public Methods

public void changedUpdate (DocumentEvent e, Shape a, ViewFactory f)

Gives notification from the document that attributes were changed in a location that this view is responsible for.

Parameters
e the change information from the associated document
a the current allocation of the view
f the factory to use to rebuild if the view has children
See Also

public float getMaximumSpan (int axis)

Determines the maximum span for this view along an axis. This is implemented to provide the superclass behavior after first making sure that the current font metrics are cached (for the nested lines which use the metrics to determine the height of the potentially wrapped lines).

Parameters
axis may be either View.X_AXIS or View.Y_AXIS
Returns
  • the span the view would like to be rendered into. 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

public float getMinimumSpan (int axis)

Determines the minimum span for this view along an axis. This is implemented to provide the superclass behavior after first making sure that the current font metrics are cached (for the nested lines which use the metrics to determine the height of the potentially wrapped lines).

Parameters
axis may be either View.X_AXIS or View.Y_AXIS
Returns
  • the span the view would like to be rendered into. 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

public float getPreferredSpan (int axis)

Determines the preferred span for this view along an axis. This is implemented to provide the superclass behavior after first making sure that the current font metrics are cached (for the nested lines which use the metrics to determine the height of the potentially wrapped lines).

Parameters
axis may be either View.X_AXIS or View.Y_AXIS
Returns
  • the span the view would like to be rendered into. 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

public void insertUpdate (DocumentEvent e, Shape a, ViewFactory f)

Gives notification that something was inserted into the document in a location that this view is responsible for. This is implemented to simply update the children.

Parameters
e the change information from the associated document
a the current allocation of the view
f the factory to use to rebuild if the view has children
See Also

public float nextTabStop (float x, int tabOffset)

Returns the next tab stop position after a given reference position. This implementation does not support things like centering so it ignores the tabOffset argument.

Parameters
x the current position >= 0
tabOffset the position within the text stream that the tab occurred at >= 0.
Returns
  • the tab stop, measured in points >= 0

public void paint (Graphics g, Shape a)

Renders using the given rendering surface and area on that surface. This is implemented to stash the selection positions, selection colors, and font metrics for the nested lines to use.

Parameters
g the rendering surface to use
a the allocated region to render into
See Also

public void removeUpdate (DocumentEvent e, Shape a, ViewFactory f)

Gives notification that something was removed from the document in a location that this view is responsible for. This is implemented to simply update the children.

Parameters
e the change information from the associated document
a the current allocation of the view
f the factory to use to rebuild if the view has children
See Also

public void setSize (float width, float height)

Sets the size of the view. This should cause layout of the view along the given axis, if it has any layout duties.

Parameters
width the width >= 0
height the height >= 0

Protected Methods

protected int calculateBreakPosition (int p0, int p1)

This is called by the nested wrapped line views to determine the break location. This can be reimplemented to alter the breaking behavior. It will either break at word or character boundaries depending upon the break argument given at construction.

protected void drawLine (int p0, int p1, Graphics g, int x, int y)

Renders a line of text, suppressing whitespace at the end and expanding any tabs. This is implemented to make calls to the methods drawUnselectedText and drawSelectedText so that the way selected and unselected text are rendered can be customized.

Parameters
p0 the starting document location to use >= 0
p1 the ending document location to use >= p1
g the graphics context
x the starting X position >= 0
y the starting Y position >= 0
See Also

protected int drawSelectedText (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.

Parameters
g the graphics context
x the starting X coordinate >= 0
y the starting Y coordinate >= 0
p0 the beginning position in the model >= 0
p1 the ending position in the model >= p0
Returns
  • the location of the end of the range.
Throws
BadLocationException if the range is invalid

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

Renders the given range in the model as normal unselected text.

Parameters
g the graphics context
x the starting X coordinate >= 0
y the starting Y coordinate >= 0
p0 the beginning position in the model >= 0
p1 the ending position in the model >= p0
Returns
  • the X location of the end of the range >= 0
Throws
BadLocationException if the range is invalid

protected final Segment getLineBuffer ()

Gives access to a buffer that can be used to fetch text from the associated document.

Returns
  • the buffer

protected int getTabSize ()

Returns the tab size set for the document, defaulting to 8.

Returns
  • the tab size

protected void loadChildren (ViewFactory f)

Loads all of the children to initialize the view. This is called by the setParent method. Subclasses can reimplement this to initialize their child views in a different manner. The default implementation creates a child view for each child element.

Parameters
f the view factory