Class LabelView

java.lang.Object

javax.swing.text.View

javax.swing.text.GlyphView

javax.swing.text.LabelView

All Implemented Interfaces:

Cloneable, SwingConstants, TabableView

Direct Known Subclasses:

InlineView

public class LabelView
extends GlyphView
implements TabableView

A LabelView is a styled chunk of text that represents a view mapped over an element in the text model. It caches the character level attributes used for rendering.

Nested Class Summary

Nested classes/interfaces declared in class GlyphView

GlyphView.GlyphPainter

Modifier and Type	Class	Description
static class	GlyphView.GlyphPainter	A class to perform rendering of the glyphs.

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

Method Summary

Modifier and Type	Method	Description
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.
Color	getBackground()	Fetches the background color to use to render the glyphs.
Font	getFont()	Fetches the font that the glyphs should be based upon.
protected FontMetrics	getFontMetrics()	Deprecated. FontMetrics are not used for glyph rendering when running in the JDK.
Color	getForeground()	Fetches the foreground color to use to render the glyphs.
boolean	isStrikeThrough()	Determines if the glyphs should have a strikethrough line.
boolean	isSubscript()	Determines if the glyphs should be rendered as superscript.
boolean	isSuperscript()	Determines if the glyphs should be rendered as subscript.
boolean	isUnderline()	Determines if the glyphs should be underlined.
protected void	setBackground(Color bg)	Sets the background color for the view.
protected void	setPropertiesFromAttributes()	Sets the cached properties from the attributes.
protected void	setStrikeThrough(boolean s)	Sets whether or not the view has a strike/line through it.
protected void	setSubscript(boolean s)	Sets whether or not the view represents a subscript.
protected void	setSuperscript(boolean s)	Sets whether or not the view represents a superscript.
protected void	setUnderline(boolean u)	Sets whether or not the view is underlined.

Methods declared in class GlyphView

breakView, checkPainter, clone, createFragment, getAlignment, getBreakWeight, getEndOffset, getGlyphPainter, getMinimumSpan, getNextVisualPositionFrom, getPartialSpan, getPreferredSpan, getStartOffset, getTabbedSpan, getTabExpander, getText, insertUpdate, modelToView, paint, removeUpdate, setGlyphPainter, viewToModel

Modifier and Type	Method	Description
View	breakView(int axis, int p0, float pos, float len)	Breaks this view on the given axis at the given length.
protected void	checkPainter()	Check to see that a glyph painter exists.
protected final Object	clone()	Creates a shallow copy.
View	createFragment(int p0, int p1)	Creates a view that represents a portion of the element.
float	getAlignment(int axis)	Determines the desired alignment for this view along an axis.
int	getBreakWeight(int axis, float pos, float len)	Determines how attractive a break opportunity in this view is.
int	getEndOffset()	Fetches the portion of the model that this view is responsible for.
GlyphView.GlyphPainter	getGlyphPainter()	Fetch the currently installed glyph painter.
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 that one might place a caret.
float	getPartialSpan(int p0, int p1)	Determines the span along the same axis as tab expansion for a portion of the view.
float	getPreferredSpan(int axis)	Determines the preferred span for this view along an axis.
int	getStartOffset()	Fetches the portion of the model that this view is responsible for.
float	getTabbedSpan(float x, TabExpander e)	Determines the desired span when using the given tab expansion implementation.
TabExpander	getTabExpander()	Fetch the TabExpander to use if tabs are present in this view.
Segment	getText(int p0, int p1)	Fetch a reference to the text that occupies the given range.
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.
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.
void	paint(Graphics g, Shape a)	Renders a portion of a text style run.
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	setGlyphPainter(GlyphView.GlyphPainter p)	Sets the painter to use for rendering glyphs.
int	viewToModel(float x, float y, Shape a, Position.Bias[] biasReturn)	Provides a mapping from the view coordinate space to the logical coordinate space of the model.

Methods declared in class View

append, forwardUpdate, forwardUpdateToView, getAttributes, getChildAllocation, getContainer, getDocument, getElement, getGraphics, getMaximumSpan, getParent, getResizeWeight, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, isVisible, modelToView, modelToView, preferenceChanged, remove, removeAll, replace, setParent, setSize, updateChildren, updateLayout, viewToModel

Modifier and Type	Method	Description
void	append(View v)	Appends a single child view.
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.
AttributeSet	getAttributes()	Fetches the attributes to use when rendering.
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.
Graphics	getGraphics()	Fetch a Graphics for rendering.
float	getMaximumSpan(int axis)	Determines the maximum span for this view along an axis.
View	getParent()	Returns the parent of the view.
int	getResizeWeight(int axis)	Determines the resizability of the view along the given axis.
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.
void	setSize(float width, float height)	Sets the size of the 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

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

Modifier and Type	Method	Description
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

LabelView

public LabelView(Element elem)

Constructs a new view wrapped on an element.

Parameters:

elem - the element

Method Details

setUnderline

protected void setUnderline(boolean u)

Sets whether or not the view is underlined. Note that this setter is protected and is really only meant if you need to update some additional state when set.

Parameters:

u - true if the view is underlined, otherwise false

See Also:

• isUnderline()

setStrikeThrough

protected void setStrikeThrough(boolean s)

Sets whether or not the view has a strike/line through it. Note that this setter is protected and is really only meant if you need to update some additional state when set.

Parameters:

s - true if the view has a strike/line through it, otherwise false

See Also:

• isStrikeThrough()

setSuperscript

protected void setSuperscript(boolean s)

Sets whether or not the view represents a superscript. Note that this setter is protected and is really only meant if you need to update some additional state when set.

Parameters:

s - true if the view represents a superscript, otherwise false

See Also:

• isSuperscript()

setSubscript

protected void setSubscript(boolean s)

Sets whether or not the view represents a subscript. Note that this setter is protected and is really only meant if you need to update some additional state when set.

Parameters:

s - true if the view represents a subscript, otherwise false

See Also:

• isSubscript()

setBackground

protected void setBackground(Color bg)

Sets the background color for the view. This method is typically invoked as part of configuring this View. If you need to customize the background color you should override setPropertiesFromAttributes and invoke this method. A value of null indicates no background should be rendered, so that the background of the parent View will show through.

Parameters:

bg - background color, or null

Since:

1.5

See Also:

• setPropertiesFromAttributes()

setPropertiesFromAttributes

protected void setPropertiesFromAttributes()

Sets the cached properties from the attributes.

getFontMetrics

@Deprecated
protected FontMetrics getFontMetrics()

Deprecated.

FontMetrics are not used for glyph rendering when running in the JDK.

Fetches the FontMetrics used for this view.

Returns:

the FontMetrics used for this view

getBackground

public Color getBackground()

Fetches the background color to use to render the glyphs. This is implemented to return a cached background color, which defaults to null.

Overrides:

getBackground in class GlyphView

Returns:

the cached background color

Since:

1.3

getForeground

public Color getForeground()

Fetches the foreground color to use to render the glyphs. This is implemented to return a cached foreground color, which defaults to null.

Overrides:

getForeground in class GlyphView

Returns:

the cached foreground color

Since:

1.3

getFont

public Font getFont()

Fetches the font that the glyphs should be based upon. This is implemented to return a cached font.

Overrides:

getFont in class GlyphView

Returns:

the cached font

isUnderline

public boolean isUnderline()

Determines if the glyphs should be underlined. If true, an underline should be drawn through the baseline. This is implemented to return the cached underline property.

When you request this property, LabelView re-syncs its state with the properties of the Element's AttributeSet. If Element's AttributeSet does not have this property set, it will revert to false.

Overrides:

isUnderline in class GlyphView

Returns:

the value of the cached underline property

Since:

1.3

isStrikeThrough

public boolean isStrikeThrough()

Determines if the glyphs should have a strikethrough line. If true, a line should be drawn through the center of the glyphs. This is implemented to return the cached strikeThrough property.

When you request this property, LabelView re-syncs its state with the properties of the Element's AttributeSet. If Element's AttributeSet does not have this property set, it will revert to false.

Overrides:

isStrikeThrough in class GlyphView

Returns:

the value of the cached strikeThrough property

Since:

1.3

isSubscript

public boolean isSubscript()

Determines if the glyphs should be rendered as superscript.

When you request this property, LabelView re-syncs its state with the properties of the Element's AttributeSet. If Element's AttributeSet does not have this property set, it will revert to false.

Overrides:

isSubscript in class GlyphView

Returns:

the value of the cached subscript property

Since:

1.3

isSuperscript

public boolean isSuperscript()

Determines if the glyphs should be rendered as subscript.

When you request this property, LabelView re-syncs its state with the properties of the Element's AttributeSet. If Element's AttributeSet does not have this property set, it will revert to false.

Overrides:

isSuperscript in class GlyphView

Returns:

the value of the cached superscript property

Since:

1.3

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 GlyphView

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)