Class WrappedPlainView

java.lang.Object

javax.swing.text.View

javax.swing.text.CompositeView

javax.swing.text.BoxView

javax.swing.text.WrappedPlainView

All Implemented Interfaces:

SwingConstants, TabExpander

public class WrappedPlainView
extends BoxView
implements TabExpander

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:

• View

Field Summary

Fields declared in class View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

Modifier and Type	Field	Description
static final int	BadBreakWeight	The weight to indicate a view is a bad break opportunity for the purpose of formatting.
static final int	ExcellentBreakWeight	The weight to indicate a view supports breaking, and this represents a very attractive place to break.
static final int	ForcedBreakWeight	The weight to indicate a view supports breaking, and must be broken to be represented properly when placed in a view that formats its children by breaking them.
static final int	GoodBreakWeight	The weight to indicate a view supports breaking, but better opportunities probably exist.
static final int	X_AXIS	Axis for format/break operations.
static final int	Y_AXIS	Axis for format/break operations.

Fields declared in interface SwingConstants

BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST

Modifier and Type	Field	Description
static final int	BOTTOM	Box-orientation constant used to specify the bottom of a box.
static final int	CENTER	The central position in an area.
static final int	EAST	Compass-direction east (right).
static final int	HORIZONTAL	Horizontal orientation.
static final int	LEADING	Identifies the leading edge of text for use with left-to-right and right-to-left languages.
static final int	LEFT	Box-orientation constant used to specify the left side of a box.
static final int	NEXT	Identifies the next direction in a sequence.
static final int	NORTH	Compass-direction North (up).
static final int	NORTH_EAST	Compass-direction north-east (upper right).
static final int	NORTH_WEST	Compass-direction north west (upper left).
static final int	PREVIOUS	Identifies the previous direction in a sequence.
static final int	RIGHT	Box-orientation constant used to specify the right side of a box.
static final int	SOUTH	Compass-direction south (down).
static final int	SOUTH_EAST	Compass-direction south-east (lower right).
static final int	SOUTH_WEST	Compass-direction south-west (lower left).
static final int	TOP	Box-orientation constant used to specify the top of a box.
static final int	TRAILING	Identifies the trailing edge of text for use with left-to-right and right-to-left languages.
static final int	VERTICAL	Vertical orientation.
static final int	WEST	Compass-direction west (left).

Constructor Summary

Constructors

Constructor	Description
WrappedPlainView(Element elem)	Creates a new WrappedPlainView.
WrappedPlainView(Element elem, boolean wordWrap)	Creates a new WrappedPlainView.

Method Summary

Modifier and Type	Method	Description
protected int	calculateBreakPosition(int p0, int p1)	This is called by the nested wrapped line views to determine the break location.
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.
protected void	drawLine(int p0, int p1, Graphics2D g, float x, float y)	Renders a line of text, suppressing whitespace at the end and expanding any tabs.
protected void	drawLine(int p0, int p1, Graphics g, int x, int y)	Deprecated. replaced by drawLine(int, int, Graphics2D, float, float)
protected float	drawSelectedText(Graphics2D g, float x, float y, int p0, int p1)	Renders the given range in the model as selected text.
protected int	drawSelectedText(Graphics g, int x, int y, int p0, int p1)	Deprecated. replaced by drawSelectedText(Graphics2D, float, float, int, int)
protected float	drawUnselectedText(Graphics2D g, float x, float y, int p0, int p1)	Renders the given range in the model as normal unselected text.
protected int	drawUnselectedText(Graphics g, int x, int y, int p0, int p1)	Deprecated. replaced by drawUnselectedText(Graphics2D, float, float, int, int)
protected final Segment	getLineBuffer()	Gives access to a buffer that can be used to fetch text from the associated document.
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.
protected int	getTabSize()	Returns the tab size set for the document, defaulting to 8.
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.
protected void	loadChildren(ViewFactory f)	Loads all of the children to initialize the view.
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.

Methods declared in class BoxView

baselineLayout, baselineRequirements, calculateMajorAxisRequirements, calculateMinorAxisRequirements, childAllocation, flipEastAndWestAtEnds, forwardUpdate, getAlignment, getAxis, getChildAllocation, getHeight, getOffset, getResizeWeight, getSpan, getViewAtPoint, getWidth, isAfter, isAllocationValid, isBefore, isLayoutValid, layout, layoutChanged, layoutMajorAxis, layoutMinorAxis, modelToView, paintChild, preferenceChanged, replace, setAxis, viewToModel

Modifier and Type	Method	Description
protected void	baselineLayout(int targetSpan, int axis, int[] offsets, int[] spans)	Computes the location and extent of each child view in this BoxView given the targetSpan, which is the width (or height) of the region we have to work with.
protected SizeRequirements	baselineRequirements(int axis, SizeRequirements r)	Calculates the size requirements for this BoxView by examining the size of each child view.
protected SizeRequirements	calculateMajorAxisRequirements(int axis, SizeRequirements r)	Calculates the size requirements for the major axis axis.
protected SizeRequirements	calculateMinorAxisRequirements(int axis, SizeRequirements r)	Calculates the size requirements for the minor axis axis.
protected void	childAllocation(int index, Rectangle alloc)	Allocates a region for a child view.
protected boolean	flipEastAndWestAtEnds(int position, Position.Bias bias)	Determines in which direction the next view lays.
protected void	forwardUpdate(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a, ViewFactory f)	Forwards the given DocumentEvent to the child views that need to be notified of the change to the model.
float	getAlignment(int axis)	Determines the desired alignment for this view along an axis.
int	getAxis()	Fetches the tile axis property.
Shape	getChildAllocation(int index, Shape a)	Fetches the allocation for the given child view.
int	getHeight()	Returns the current height of the box.
protected int	getOffset(int axis, int childIndex)	Fetches the offset of a particular child's current layout.
int	getResizeWeight(int axis)	Gets the resize weight.
protected int	getSpan(int axis, int childIndex)	Fetches the span of a particular child's current layout.
protected View	getViewAtPoint(int x, int y, Rectangle alloc)	Fetches the child view at the given coordinates.
int	getWidth()	Returns the current width of the box.
protected boolean	isAfter(int x, int y, Rectangle innerAlloc)	Determines if a point falls after an allocated region.
protected boolean	isAllocationValid()	Are the allocations for the children still valid?
protected boolean	isBefore(int x, int y, Rectangle innerAlloc)	Determines if a point falls before an allocated region.
protected boolean	isLayoutValid(int axis)	Determines if the layout is valid along the given axis.
protected void	layout(int width, int height)	Perform layout on the box
void	layoutChanged(int axis)	Invalidates the layout along an axis.
protected void	layoutMajorAxis(int targetSpan, int axis, int[] offsets, int[] spans)	Performs layout for the major axis of the box (i.e. the axis that it represents).
protected void	layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans)	Performs layout for the minor axis of the box (i.e. the axis orthogonal to the axis that it represents).
Shape	modelToView(int pos, Shape a, Position.Bias b)	Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.
protected void	paintChild(Graphics g, Rectangle alloc, int index)	Paints a child.
void	preferenceChanged(View child, boolean width, boolean height)	This is called by a child to indicate its preferred span has changed.
void	replace(int index, int length, View[] elems)	Invalidates the layout and resizes the cache of requests/allocations.
void	setAxis(int axis)	Sets the tile axis property.
int	viewToModel(float x, float y, Shape a, Position.Bias[] bias)	Provides a mapping from the view coordinate space to the logical coordinate space of the model.

Methods declared in class CompositeView

getBottomInset, getInsideAllocation, getLeftInset, getNextEastWestVisualPositionFrom, getNextNorthSouthVisualPositionFrom, getNextVisualPositionFrom, getRightInset, getTopInset, getView, getViewAtPosition, getViewCount, getViewIndex, getViewIndexAtPosition, modelToView, setInsets, setParagraphInsets, setParent

Modifier and Type	Method	Description
protected short	getBottomInset()	Gets the bottom inset.
protected Rectangle	getInsideAllocation(Shape a)	Translates the immutable allocation given to the view to a mutable allocation that represents the interior allocation (i.e. the bounds of the given allocation with the top, left, bottom, and right insets removed.
protected short	getLeftInset()	Gets the left inset.
protected int	getNextEastWestVisualPositionFrom(int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet)	Returns the next visual position for the cursor, in either the east or west direction.
protected int	getNextNorthSouthVisualPositionFrom(int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet)	Returns the next visual position for the cursor, in either the north or south direction.
int	getNextVisualPositionFrom(int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet)	Provides a way to determine the next visually represented model location that one might place a caret.
protected short	getRightInset()	Gets the right inset.
protected short	getTopInset()	Gets the top inset.
View	getView(int n)	Returns the n-th view in this container.
protected View	getViewAtPosition(int pos, Rectangle a)	Fetches the child view that represents the given position in the model.
int	getViewCount()	Returns the number of child views of this view.
int	getViewIndex(int pos, Position.Bias b)	Returns the child view index representing the given position in the model.
protected int	getViewIndexAtPosition(int pos)	Fetches the child view index representing the given position in the model.
Shape	modelToView(int p0, Position.Bias b0, int p1, Position.Bias b1, Shape a)	Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.
protected void	setInsets(short top, short left, short bottom, short right)	Sets the insets for the view.
protected void	setParagraphInsets(AttributeSet attr)	Sets the insets from the paragraph attributes specified in the given attributes.
void	setParent(View parent)	Sets the parent of the view.

Methods declared in class View

append, breakView, createFragment, forwardUpdateToView, getAttributes, getBreakWeight, getContainer, getDocument, getElement, getEndOffset, getGraphics, getParent, getStartOffset, getToolTipText, getViewFactory, getViewIndex, insert, isVisible, modelToView, remove, removeAll, updateChildren, updateLayout, viewToModel

Modifier and Type	Method	Description
void	append(View v)	Appends a single child view.
View	breakView(int axis, int offset, float pos, float len)	Tries to break this view on the given axis.
View	createFragment(int p0, int p1)	Creates a view that represents a portion of the element.
protected void	forwardUpdateToView(View v, DocumentEvent e, Shape a, ViewFactory f)	Forwards the DocumentEvent to the give child view.
AttributeSet	getAttributes()	Fetches the attributes to use when rendering.
int	getBreakWeight(int axis, float pos, float len)	Determines how attractive a break opportunity in this view is.
Container	getContainer()	Fetches the container hosting the view.
Document	getDocument()	Fetches the model associated with the view.
Element	getElement()	Fetches the structural portion of the subject that this view is mapped to.
int	getEndOffset()	Fetches the portion of the model for which this view is responsible.
Graphics	getGraphics()	Fetch a Graphics for rendering.
View	getParent()	Returns the parent of the view.
int	getStartOffset()	Fetches the portion of the model for which this view is responsible.
String	getToolTipText(float x, float y, Shape allocation)	Returns the tooltip text at the specified location.
ViewFactory	getViewFactory()	Fetches the ViewFactory implementation that is feeding the view hierarchy.
int	getViewIndex(float x, float y, Shape allocation)	Returns the child view index representing the given position in the view.
void	insert(int offs, View v)	Inserts a single child view.
boolean	isVisible()	Returns a boolean that indicates whether the view is visible or not.
Shape	modelToView(int pos, Shape a)	Deprecated.
void	remove(int i)	Removes one of the children at the given position.
void	removeAll()	Removes all of the children.
protected boolean	updateChildren(DocumentEvent.ElementChange ec, DocumentEvent e, ViewFactory f)	Updates the child views in response to receiving notification that the model changed, and there is change record for the element this view is responsible for.
protected void	updateLayout(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a)	Updates the layout in response to receiving notification of change from the model.
int	viewToModel(float x, float y, Shape a)	Deprecated.

Methods declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Modifier and Type	Method	Description
protected Object	clone()	Creates and returns a copy of this object.
boolean	equals(Object obj)	Indicates whether some other object is "equal to" this one.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
final Class<?>	getClass()	Returns the runtime class of this Object.
int	hashCode()	Returns a hash code value for this object.
final void	notify()	Wakes up a single thread that is waiting on this object's monitor.
final void	notifyAll()	Wakes up all threads that are waiting on this object's monitor.
String	toString()	Returns a string representation of the object.
final void	wait()	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
final void	wait(long timeoutMillis)	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
final void	wait(long timeoutMillis, int nanos)	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

Constructor Details

WrappedPlainView

public WrappedPlainView(Element elem)

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

Parameters:

elem - the element underlying the view

WrappedPlainView

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?

Method Details

getTabSize

protected int getTabSize()

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

Returns:

the tab size

drawLine

@Deprecated(since="9")
protected void drawLine(int p0,
 int p1,
 Graphics g,
 int x,
 int y)

Deprecated.

replaced by drawLine(int, int, Graphics2D, float, float)

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:

• drawUnselectedText(Graphics, int, int, int, int)
• drawSelectedText(Graphics, int, int, int, int)

drawLine

protected void drawLine(int p0,
 int p1,
 Graphics2D g,
 float x,
 float 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

Since:

9

See Also:

• drawUnselectedText(Graphics, int, int, int, int)
• drawSelectedText(Graphics, int, int, int, int)

drawUnselectedText

@Deprecated(since="9")
protected int drawUnselectedText(Graphics g,
 int x,
 int y,
 int p0,
 int p1)
                          throws BadLocationException

Deprecated.

replaced by drawUnselectedText(Graphics2D, float, float, int, int)

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

drawUnselectedText

protected float drawUnselectedText(Graphics2D g,
 float x,
 float y,
 int p0,
 int p1)
                            throws BadLocationException

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

Since:

9

drawSelectedText

@Deprecated(since="9")
protected int drawSelectedText(Graphics g,
 int x,
 int y,
 int p0,
 int p1)
                        throws BadLocationException

Deprecated.

replaced by drawSelectedText(Graphics2D, float, float, int, int)

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

drawSelectedText

protected float drawSelectedText(Graphics2D g,
 float x,
 float 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.

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

Since:

9

getLineBuffer

protected final Segment getLineBuffer()

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

Returns:

the buffer

calculateBreakPosition

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.

Parameters:

p0 - the starting document location

p1 - the ending document location to use

Returns:

the break position

loadChildren

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.

Overrides:

loadChildren in class CompositeView

Parameters:

f - the view factory

See Also:

• CompositeView.setParent(View)

nextTabStop

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.

Specified by:

nextTabStop in interface TabExpander

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

paint

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.

Overrides:

paint in class BoxView

Parameters:

g - the rendering surface to use

a - the allocated region to render into

See Also:

• View.paint(Graphics, Shape)

setSize

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.

Overrides:

setSize in class BoxView

Parameters:

width - the width >= 0

height - the height >= 0

getPreferredSpan

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).

Overrides:

getPreferredSpan in class BoxView

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:

• View.getPreferredSpan(int)

getMinimumSpan

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).

Overrides:

getMinimumSpan in class BoxView

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:

• View.getMinimumSpan(int)

getMaximumSpan

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).

Overrides:

getMaximumSpan in class BoxView

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:

• View.getMaximumSpan(int)

insertUpdate

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.

Overrides:

insertUpdate in class View

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:

• View.insertUpdate(DocumentEvent, Shape, ViewFactory)

removeUpdate

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.

Overrides:

removeUpdate in class View

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:

• View.removeUpdate(DocumentEvent, Shape, ViewFactory)

changedUpdate

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.

Overrides:

changedUpdate in class View

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:

• View.changedUpdate(DocumentEvent, Shape, ViewFactory)