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 javax.swing.text.View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

Fields declared in interface javax.swing.SwingConstants

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

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 javax.swing.text.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

Methods declared in class java.lang.Object

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

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(java.awt.Graphics, int, int, int, int)
• drawSelectedText(java.awt.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(java.awt.Graphics, int, int, int, int)
• drawSelectedText(java.awt.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(java.awt.Graphics, java.awt.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, java.awt.Shape, javax.swing.text.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