Class PlainView

java.lang.Object

javax.swing.text.View

javax.swing.text.PlainView

All Implemented Interfaces:

SwingConstants, TabExpander

Direct Known Subclasses:

FieldView

public class PlainView
extends View
implements TabExpander

Implements View interface for a simple multi-line text view that has text in one font and color. The view represents each child element as a line of text.

See Also:

• View

Field Summary

Fields

Modifier and Type	Field	Description
protected FontMetrics	metrics	Font metrics for the current font.

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
PlainView(Element elem)	Constructs a new PlainView wrapped on an element.

Method Summary

Modifier and Type	Method	Description
void	changedUpdate(DocumentEvent changes, Shape a, ViewFactory f)	Gives notification from the document that attributes were changed in a location that this view is responsible for.
protected void	damageLineRange(int line0, int line1, Shape a, Component host)	Repaint the given line range.
protected void	drawLine(int lineIndex, Graphics2D g, float x, float y)	Renders a line of text, suppressing whitespace at the end and expanding any tabs.
protected void	drawLine(int lineIndex, Graphics g, int x, int y)	Deprecated. replaced by drawLine(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	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 changes, Shape a, ViewFactory f)	Gives notification that something was inserted into the document in a location that this view is responsible for.
protected Rectangle	lineToRect(Shape a, int line)	Determine the rectangle that represents the given line.
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.
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 changes, 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 void	updateDamage(DocumentEvent changes, Shape a, ViewFactory f)	Repaint the region of change covered by the given document event.
protected void	updateMetrics()	Checks to see if the font metrics and longest line are up-to-date.
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 View

append, breakView, createFragment, forwardUpdate, forwardUpdateToView, getAlignment, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getGraphics, getMaximumSpan, getMinimumSpan, getNextVisualPositionFrom, getParent, getResizeWeight, getStartOffset, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, isVisible, modelToView, modelToView, preferenceChanged, remove, removeAll, replace, setParent, 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	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.
protected void	forwardUpdateToView(View v, DocumentEvent e, Shape a, ViewFactory f)	Forwards the DocumentEvent to the give child view.
float	getAlignment(int axis)	Determines the desired alignment for this view along an axis.
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.
Shape	getChildAllocation(int index, Shape a)	Fetches the allocation for the given child view.
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.
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.
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 at which one might place a caret.
View	getParent()	Returns the parent of the view.
int	getResizeWeight(int axis)	Determines the resizability of the view along the given axis.
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.
View	getView(int n)	Gets the nth child view.
int	getViewCount()	Returns the number of views in this view.
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.
int	getViewIndex(int pos, Position.Bias b)	Returns the child view index representing the given position in the model.
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.
Shape	modelToView(int p0, Position.Bias b0, int p1, Position.Bias b1, Shape a)	Provides a mapping, for a given region, from the document model coordinate space to the view coordinate space.
void	preferenceChanged(View child, boolean width, boolean height)	Child views can call this on the parent to indicate that the preference has changed and should be reconsidered for layout.
void	remove(int i)	Removes one of the children at the given position.
void	removeAll()	Removes all of the children.
void	replace(int offset, int length, View[] views)	Replaces child views.
void	setParent(View parent)	Establishes the parent view for this view.
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.

Field Details

metrics

protected FontMetrics metrics

Font metrics for the current font.

Constructor Details

PlainView

public PlainView(Element elem)

Constructs a new PlainView wrapped on an element.

Parameters:

elem - the element

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 lineIndex,
 Graphics g,
 int x,
 int y)

Deprecated.

replaced by drawLine(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:

lineIndex - the line to draw >= 0

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 lineIndex,
 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:

lineIndex - the line to draw >= 0

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. Uses the foreground or disabled color to render the 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 >= 0

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. Uses the foreground or disabled color to render the 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 >= 0

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 >= 0

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 >= 0

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

updateMetrics

protected void updateMetrics()

Checks to see if the font metrics and longest line are up-to-date.

Since:

1.4

getPreferredSpan

public float getPreferredSpan(int axis)

Determines the preferred span for this view along an axis.

Specified by:

getPreferredSpan in class View

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.

Throws:

IllegalArgumentException - for an invalid axis

paint

public void paint(Graphics g,
 Shape a)

Renders using the given rendering surface and area on that surface. The view may need to do layout and create child views to enable itself to render into the given allocation.

Specified by:

paint in class View

Parameters:

g - the rendering surface to use

a - the allocated region to render into

See Also:

• View.paint(Graphics, Shape)

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.

Specified by:

modelToView in class View

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, Shape, Position.Bias)

viewToModel

public 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.

Specified by:

viewToModel in class View

Parameters:

x - the X coordinate >= 0

y - the Y coordinate >= 0

a - the allocated region to render into

bias - the returned bias

Returns:

the location within the model that best represents the given point in the view >= 0

See Also:

• View.viewToModel(float, float, Shape, Position.Bias[])

insertUpdate

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

Gives notification that something was inserted into the document in a location that this view is responsible for.

Overrides:

insertUpdate in class View

Parameters:

changes - 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 changes,
 Shape a,
 ViewFactory f)

Gives notification that something was removed from the document in a location that this view is responsible for.

Overrides:

removeUpdate in class View

Parameters:

changes - 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 changes,
 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:

changes - 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)

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 View

Parameters:

width - the width >= 0

height - the height >= 0

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

updateDamage

protected void updateDamage(DocumentEvent changes,
 Shape a,
 ViewFactory f)

Repaint the region of change covered by the given document event. Damages the line that begins the range to cover the case when the insert/remove is only on one line. If lines are added or removed, damages the whole view. The longest line is checked to see if it has changed.

Parameters:

changes - 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

Since:

1.4

damageLineRange

protected void damageLineRange(int line0,
 int line1,
 Shape a,
 Component host)

Repaint the given line range.

Parameters:

line0 - the starting line number to repaint. This must be a valid line number in the model.

line1 - the ending line number to repaint. This must be a valid line number in the model.

a - the region allocated for the view to render into

host - the component hosting the view (used to call repaint)

Since:

1.4

lineToRect

protected Rectangle lineToRect(Shape a,
 int line)

Determine the rectangle that represents the given line.

Parameters:

a - the region allocated for the view to render into

line - the line number to find the region of. This must be a valid line number in the model.

Returns:

the rectangle that represents the given line

Since:

1.4