Appends a single child view.

  Appends a single child view. This is a convenience
call to replace.
Parameters:
- v - the view
Since: 1.3
See Also: View.replace(int, int, javax.swing.text.View[]),

  Breaks this view on the given axis at the given length.

  Breaks this view on the given axis at the given length.
This is implemented to attempt to break on a whitespace
location, and returns a fragment with the whitespace at
the end. If a whitespace location can't be found, the
nearest character is used.
Returns: the fragment of the view that represents the given span, if the view can be broken. If the view doesn't support breaking behavior, the view itself is returned.
Parameters:
- axis - may be either View.X_AXIS or View.Y_AXIS
- p0 - the location in the model where the fragment should start it's representation >= 0.
- pos - the position along the axis that the broken view would occupy >= 0. This may be useful for things like tab calculations.
- len - specifies the distance along the axis where a potential break is desired >= 0.
See Also: View.breakView(int, int, float, float),

  Check to see that a glyph painter exists.

  Check to see that a glyph painter exists. If a painter
doesn't exist, a default glyph painter will be installed.

  Creates a shallow copy.

  Creates a shallow copy. This is used by the
createFragment and breakView methods.
Returns: the copy

  Creates a view that represents a portion of the element.

  Creates a view that represents a portion of the element. This is potentially useful during formatting operations for taking measurements of fragments of the view. If the view doesn't support fragmenting (the default), it should return itself.

This view does support fragmenting. It is implemented to return a nested class that shares state in this view representing only a portion of the view.
Returns: the view fragment, or itself if the view doesn't support breaking into fragments
Parameters:
- p0 - the starting offset >= 0. This should be a value greater or equal to the element starting offset and less than the element ending offset.
- p1 - the ending offset > p0. This should be a value less than or equal to the elements end offset and greater than the elements starting offset.
See Also: LabelView,

  Forwards the given DocumentEvent to the child views that need to be notified of the change to the model.

  Forwards the given DocumentEvent to the child views
that need to be notified of the change to the model.
If there were changes to the element this view is
responsible for, that should be considered when
forwarding (i.e. new child views should not get
notified).
Parameters:
- ec - changes to the element this view is responsible for (may be null if there were no changes).
- 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
Since: 1.3
See Also: View.insertUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory), View.removeUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory), View.changedUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory),

  Forwards the DocumentEvent to the give child view.

  Forwards the DocumentEvent to the give child view. This
simply messages the view with a call to insertUpdate,
removeUpdate, or changedUpdate depending
upon the type of the event. This is called by
forwardUpdate to forward
the event to children that need it.
Parameters:
- v - the child view to forward the event to
- 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
Since: 1.3
See Also: View.forwardUpdate(javax.swing.event.DocumentEvent.ElementChange, javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory),

  Determines the desired alignment for this view along an axis.

  Determines the desired alignment for this view along an
axis. For the label, the alignment is along the font
baseline for the y axis, and the superclasses alignment
along the x axis.
Returns: the desired alignment. This should be a value between 0.0 and 1.0 inclusive, where 0 indicates alignment at the origin and 1.0 indicates alignment to the full span away from the origin. An alignment of 0.5 would be the center of the view.
Parameters:
- axis - may be either View.X_AXIS or View.Y_AXIS

  Fetches the attributes to use when rendering.

  Fetches the attributes to use when rendering. By default
this simply returns the attributes of the associated element.
This method should be used rather than using the element
directly to obtain access to the attributes to allow
view-specific attributes to be mixed in or to allow the
view to have view-specific conversion of attributes by
subclasses.
Each view should document what attributes it recognizes
for the purpose of rendering or layout, and should always
access them through the AttributeSet returned
by this method.

  Determines how attractive a break opportunity in this view is.

  Determines how attractive a break opportunity in this view is. This can be used for determining which view is the most attractive to call breakView on in the process of formatting. The higher the weight, the more attractive the break. A value equal to or lower than View.BadBreakWeight should not be considered for a break. A value greater than or equal to View.ForcedBreakWeight should be broken.

This is implemented to forward to the superclass for the Y_AXIS. Along the X_AXIS the following values may be returned.

View.ExcellentBreakWeight

if there is whitespace proceeding the desired break location.

View.BadBreakWeight

if the desired break location results in a break location of the starting offset.

View.GoodBreakWeight

if the other conditions don't occur.

This will normally result in the behavior of breaking on a whitespace location if one can be found, otherwise breaking between characters.
Returns: the weight, which should be a value between View.ForcedBreakWeight and View.BadBreakWeight.
Parameters:
- axis - may be either View.X_AXIS or View.Y_AXIS
- pos - the potential location of the start of the broken view >= 0. This may be useful for calculating tab positions.
- len - specifies the relative length from pos where a potential break is desired >= 0.
See Also: LabelView, ParagraphView, View.BadBreakWeight, View.GoodBreakWeight, View.ExcellentBreakWeight, View.ForcedBreakWeight,

  Fetches the allocation for the given child view.

  Fetches the allocation for the given child view.
This enables finding out where various views
are located, without assuming how the views store
their location. This returns null since the
default is to not have any child views.
Returns: the allocation to the child
Parameters:
- index - the index of the child, >= 0 && < getViewCount()
- a - the allocation to this view

  Fetches the container hosting the view.

  Fetches the container hosting the view. This is useful for
things like scheduling a repaint, finding out the host
components font, etc. The default implementation
of this is to forward the query to the parent view.
Returns: the container, null if none

  Fetches the model associated with the view.

  Fetches the model associated with the view.
Returns: the view model, null if none
See Also: View.getDocument(),

  Fetches the structural portion of the subject that this view is mapped to.

  Fetches the structural portion of the subject that this
view is mapped to. The view may not be responsible for the
entire portion of the element.
Returns: the subject
See Also: View.getElement(),

  Fetches the portion of the model that this view is responsible for.

  Fetches the portion of the model that this view is responsible for.
Returns: the ending offset into the model
See Also: View.getEndOffset(),

  Fetch the currently installed glyph painter.

  Fetch the currently installed glyph painter.
If a painter has not yet been installed, and
a default was not yet needed, null is returned.

  Fetch a Graphics for rendering.

  Fetch a Graphics for rendering.
This can be used to determine
font characteristics, and will be different for a print view
than a component view.
Returns: a Graphics object for rendering
Since: 1.3

  Determines the maximum span for this view along an axis.

  Determines the maximum span for this view along an
axis.
Returns: the maximum span the view can be rendered into
Parameters:
- axis - may be either View.X_AXIS or View.Y_AXIS
See Also: View.getPreferredSpan(int),

  Determines the minimum span for this view along an axis.

  Determines the minimum span for this view along an
axis.
Returns: the minimum span the view can be rendered into
Parameters:
- axis - may be either View.X_AXIS or View.Y_AXIS
See Also: View.getPreferredSpan(int),

  Provides a way to determine the next visually represented model location that one might place a caret.

  Provides a way to determine the next visually represented model
location that one might place a caret. Some views may not be
visible, they might not be in the same order found in the model, or
they just might not allow access to some of the locations in the
model.
Returns: the location within the model that best represents the next location visual position.
Parameters:
- pos - the position to convert >= 0
- a - the allocated region to render into
- direction - the direction from the current position that can be thought of as the arrow keys typically found on a keyboard. This may be SwingConstants.WEST, SwingConstants.EAST, SwingConstants.NORTH, or SwingConstants.SOUTH.
Throws:
- BadLocationException -
- IllegalArgumentException - for an invalid direction

  Returns the parent of the view.

  Returns the parent of the view.
Returns: the parent, or null if none exists

  Determines the span along the same axis as tab expansion for a portion of the view.

  Determines the span along the same axis as tab expansion for a portion of the view. This is intended for use by the TabExpander for cases where the tab expansion involves aligning the portion of text that doesn't have whitespace relative to the tab stop. There is therefore an assumption that the range given does not contain tabs.

This method can be called while servicing the getTabbedSpan or getPreferredSize. It has to arrange for its own text buffer to make the measurements.
Returns: the span >= 0
Parameters:
- p0 - the starting document offset >= 0
- p1 - the ending document offset >= p0

  Determines the preferred span for this view along an axis.

  Determines the preferred span for this view along an
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.
Parameters:
- axis - may be either View.X_AXIS or View.Y_AXIS

  Determines the resizability of the view along the given axis.

  Determines the resizability of the view along the
given axis. A value of 0 or less is not resizable.
Returns: the weight
Parameters:
- axis - may be either View.X_AXIS or View.Y_AXIS

  Fetches the portion of the model that this view is responsible for.

  Fetches the portion of the model that this view is responsible for.
Returns: the starting offset into the model
See Also: View.getStartOffset(),

  Determines the desired span when using the given tab expansion implementation.

  Determines the desired span when using the given
tab expansion implementation.
Returns: the desired span >= 0
Parameters:
- x - the position the view would be located at for the purpose of tab expansion >= 0.
- e - how to expand the tabs when encountered.
See Also: TabableView.getTabbedSpan(float, javax.swing.text.TabExpander),

Fetch the TabExpander to use if tabs are present in this view.

  Fetch a reference to the text that occupies the given range.

  Fetch a reference to the text that occupies
the given range. This is normally used by
the GlyphPainter to determine what characters
it should render glyphs for.
Returns: the Segment containing the text
Parameters:
- p0 - the starting document offset >= 0
- p1 - the ending document offset >= p0

  Returns the tooltip text at the specified location.

  Returns the tooltip text at the specified location. The default
implementation returns the value from the child View identified by
the passed in location.
Since: 1.4
See Also: JTextComponent.getToolTipText(java.awt.event.MouseEvent),

  Gets the nth child view.

  Gets the nth child view. Since there are no
children by default, this returns null.
Returns: the view
Parameters:
- n - the number of the view to get, >= 0 && < getViewCount()

  Returns the number of views in this view.

  Returns the number of views in this view. Since
the default is to not be a composite view this
returns 0.
Returns: the number of views >= 0
See Also: View.getViewCount(),

  Fetches the ViewFactory implementation that is feeding the view hierarchy.

  Fetches the ViewFactory implementation that is feeding
the view hierarchy. Normally the views are given this
as an argument to updates from the model when they
are most likely to need the factory, but this
method serves to provide it at other times.
Returns: the factory, null if none

  Returns the child view index representing the given position in the view.

  Returns the child view index representing the given position in
the view. This iterates over all the children returning the
first with a bounds that contains x, y.
Returns: index of the view representing the given location, or -1 if no view represents that position
Parameters:
- x - the x coordinate
- y - the y coordinate
- allocation - current allocation of the View.
Since: 1.4

  Returns the child view index representing the given position in the model.

  Returns the child view index representing the given position in
the model. By default a view has no children so this is implemented
to return -1 to indicate there is no valid child index for any
position.
Returns: index of the view representing the given position, or -1 if no view represents that position
Parameters:
- pos - the position >= 0
Since: 1.3

  Inserts a single child view.

  Inserts a single child view. This is a convenience
call to replace.
Parameters:
- offs - the offset of the view to insert before >= 0
- v - the view
Since: 1.3
See Also: View.replace(int, int, javax.swing.text.View[]),

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

  Gives notification that something was inserted into
the document in a location that this view is responsible for.
This is implemented to call preferenceChanged along the
axis the glyphs are rendered.
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(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory),

  Returns a boolean that indicates whether the view is visible or not.

  Returns a boolean that indicates whether
the view is visible or not. By default
all views are visible.
Returns: always returns true

  Provides a mapping, for a given region, from the document model coordinate space to the view coordinate space.

  Provides a mapping, for a given region,
from the document model coordinate space
to the view coordinate space. The specified region is
created as a union of the first and last character positions.
Returns: the bounding box which is a union of the region specified by the first and last character positions
Parameters:
- p0 - the position of the first character (>=0)
- b0 - the bias of the first character position, toward the previous character or the next character represented by the offset, in case the position is a boundary of two views; b0 will have one of these values:

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

- p1 - the position of the last character (>=0)
- b1 - the bias for the second character position, defined one of the legal values shown above
- a - the area of the view, which encompasses the requested region
Throws:
- BadLocationException - if the given position does not represent a valid location in the associated document
- IllegalArgumentException - if b0 or b1 are not one of the legal Position.Bias values listed above
See Also: View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[]),

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

  Provides a mapping from the document model coordinate space
to the coordinate space of the view mapped to it. This is
implemented to default the bias to Position.Bias.Forward
which was previously implied.
Returns: the bounding box of the given position is returned
Parameters:
- pos - the position to convert >= 0
- a - the allocated region in which to render
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),

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

  Provides a mapping from the document model coordinate space
to the coordinate space of the view mapped to it.
Returns: the bounding box of the given position
Parameters:
- pos - the position to convert >= 0
- a - the allocated region to render into
- b - either Position.Bias.Forward or Position.Bias.Backward
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),

  Renders a portion of a text style run.

  Renders a portion of a text style run.
Parameters:
- g - the rendering surface to use
- a - the allocated region to render into

Paints the specified region of text in the specified color.

  Child views can call this on the parent to indicate that the preference has changed and should be reconsidered for layout.

  Child views can call this on the parent to indicate that
the preference has changed and should be reconsidered
for layout. By default this just propagates upward to
the next parent. The root view will call
revalidate on the associated text component.
Parameters:
- child - the child view
- width - true if the width preference has changed
- height - true if the height preference has changed
See Also: JComponent.revalidate(),

  Removes one of the children at the given position.

  Removes one of the children at the given position.
This is a convenience call to replace.
Since: 1.3

  Removes all of the children.

  Removes all of the children. This is a convenience
call to replace.
Since: 1.3

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

  Gives notification that something was removed from the document
in a location that this view is responsible for.
This is implemented to call preferenceChanged along the
axis the glyphs are rendered.
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(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory),

  Replaces child views.

  Replaces child views. If there are no views to remove
this acts as an insert. If there are no views to
add this acts as a remove. Views being removed will
have the parent set to null, and the internal reference
to them removed so that they can be garbage collected.
This is implemented to do nothing, because by default
a view has no children.
Parameters:
- offset - the starting index into the child views to insert the new views. This should be a value >= 0 and <= getViewCount
- length - the number of existing child views to remove This should be a value >= 0 and <= (getViewCount() - offset).
- views - the child views to add. This value can be null to indicate no children are being added (useful to remove).
Since: 1.3

Sets the painter to use for rendering glyphs.

  Establishes the parent view for this view.

  Establishes the parent view for this view. This is
guaranteed to be called before any other methods if the
parent view is functioning properly. This is also
the last method called, since it is called to indicate
the view has been removed from the hierarchy as
well. When this method is called to set the parent to
null, this method does the same for each of its children,
propogating the notification that they have been
disconnected from the view tree. If this is
reimplemented, super.setParent() should
be called.
Parameters:
- parent - the new parent, or null if the view is being removed from a parent

  Sets the size of the view.

  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

  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.

  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. This is implemented
to assume the child views are directly responsible for the
child elements of the element this view represents. The
ViewFactory is used to create child views for each element
specified as added in the ElementChange, starting at the
index specified in the given ElementChange. The number of
child views representing the removed elements specified are
removed.
Returns: whether or not the child views represent the child elements of the element this view is responsible for. Some views create children that represent a portion of the element they are responsible for, and should return false. This information is used to determine if views in the range of the added elements should be forwarded to or not
Parameters:
- ec - the change information for the element this view is responsible for. This should not be null if this method gets called
- e - the change information from the associated document
- f - the factory to use to build child views
Since: 1.3
See Also: View.insertUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory), View.removeUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory), View.changedUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory),

  Updates the layout in response to receiving notification of change from the model.

  Updates the layout in response to receiving notification of
change from the model. This is implemented to call
preferenceChanged to reschedule a new layout
if the ElementChange record is not null.
Parameters:
- ec - changes to the element this view is responsible for (may be null if there were no changes)
- e - the change information from the associated document
- a - the current allocation of the view
Since: 1.3
See Also: View.insertUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory), View.removeUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory), View.changedUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory),

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

  Provides a mapping from the view coordinate space to the logical
coordinate space of the model.
Returns: the location within the model that best represents the given point in the view >= 0
Parameters:
- x - the X coordinate >= 0
- y - the Y coordinate >= 0
- a - the allocated region in which to render
See Also: View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[]),

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

  Provides a mapping from the view coordinate space to the logical
coordinate space of the model.
Returns: the location within the model that best represents the given point of view >= 0
Parameters:
- x - the X coordinate >= 0
- y - the Y coordinate >= 0
- a - the allocated region to render into
- biasReturn - either Position.Bias.Forward or Position.Bias.Backward is returned as the zero-th element of this array
See Also: View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[]),