Class SyntaxView

java.lang.Object

javax.swing.text.View

org.fife.ui.rsyntaxtextarea.SyntaxView

All Implemented Interfaces:

SwingConstants, TabExpander, TokenOrientedView

public class SyntaxView
extends View
implements TabExpander, TokenOrientedView

The javax.swing.text.View object used by RSyntaxTextArea when word wrap is disabled. It implements syntax highlighting for programming languages using the colors and font styles specified by the RSyntaxTextArea.

You don't really have to do anything to use this class, as RSyntaxTextAreaUI automatically sets the text area's view to be an instance of this class if word wrap is disabled.

The tokens that specify how to paint the syntax-highlighted text are gleaned from the text area's RSyntaxDocument.

Version:

0.3

Author:

Robert Futrell

Field Summary

Fields inherited from class View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

Fields inherited from 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

Constructor Summary

Constructors

Constructor	Description
SyntaxView(Element elem)	Constructs a new SyntaxView wrapped around 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.
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	getPreferredSpan(int axis)	Determines the preferred span for this view along an axis.
Token	getTokenListForPhysicalLineAbove(int offset)	Returns a token list for the physical line above the physical line containing the specified offset into the document.
Token	getTokenListForPhysicalLineBelow(int offset)	Returns a token list for the physical line below the physical line containing the specified offset into the document.
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.
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.
float	nextTabStop(float x, int tabOffset)	Returns the next tab stop position after a given reference position.
void	paint(Graphics g, Shape a)	Actually paints the text area.
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)
protected void	updateDamage(DocumentEvent changes, Shape a, ViewFactory f)	Repaint the region of change covered by the given document event.
int	viewToModel(float fx, float fy, Shape a, Position.Bias[] bias)	Provides a mapping from the view coordinate space to the logical coordinate space of the model.
int	yForLine(Rectangle alloc, int line)
int	yForLineContaining(Rectangle alloc, int offs)

Methods inherited from class View

append, breakView, createFragment, forwardUpdate, forwardUpdateToView, getAlignment, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getGraphics, getMaximumSpan, getMinimumSpan, getParent, getResizeWeight, getStartOffset, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, isVisible, modelToView, preferenceChanged, remove, removeAll, replace, setParent, updateChildren, updateLayout, viewToModel

Methods inherited from class Object

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

Constructor Details

SyntaxView

public SyntaxView(Element elem)

Constructs a new SyntaxView wrapped around an element.

Parameters:

elem - The element representing the text to display.

Method Details

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)

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).

getNextVisualPositionFrom

public int getNextVisualPositionFrom(int pos,
 Position.Bias b,
 Shape a,
 int direction,
 Position.Bias[] biasRet)
                              throws BadLocationException

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 locations in the model.

Overrides:

getNextVisualPositionFrom in class View

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.

Returns:

the location within the model that best represents the next location visual position.

Throws:

BadLocationException - If the offset specified is invalid.

IllegalArgumentException - for an invalid direction

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

getTokenListForPhysicalLineAbove

public Token getTokenListForPhysicalLineAbove(int offset)

Returns a token list for the physical line above the physical line containing the specified offset into the document. Note that for this plain (non-wrapped) view, this is simply the token list for the logical line above the line containing offset, since lines are not wrapped.

Specified by:

getTokenListForPhysicalLineAbove in interface TokenOrientedView

Parameters:

offset - The offset in question.

Returns:

A token list for the physical (and in this view, logical) line before this one. If offset is in the first line in the document, null is returned.

getTokenListForPhysicalLineBelow

public Token getTokenListForPhysicalLineBelow(int offset)

Returns a token list for the physical line below the physical line containing the specified offset into the document. Note that for this plain (non-wrapped) view, this is simply the token list for the logical line below the line containing offset, since lines are not wrapped.

Specified by:

getTokenListForPhysicalLineBelow in interface TokenOrientedView

Parameters:

offset - The offset in question.

Returns:

A token list for the physical (and in this view, logical) line after this one. If offset is in the last physical line in the document, null is returned.

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.

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.

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

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)

modelToView

public Shape modelToView(int p0,
 Position.Bias b0,
 int p1,
 Position.Bias b1,
 Shape a)
                  throws BadLocationException

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.

This is implemented to subtract the width of the second character, as this view's modelToView actually returns the width of the character instead of "1" or "0" like the View implementations in javax.swing.text. Thus, if we don't override this method, the View implementation will return one character's width too much for its consumers (implementations of javax.swing.text.Highlighter).

Overrides:

modelToView in class View

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

Returns:

the bounding box which is a union of the region specified by the first and last character positions

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, Shape, Position.Bias[])

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)

Actually paints the text area. Only lines that have been damaged are repainted.

Specified by:

paint in class View

Parameters:

g - The graphics context with which to paint.

a - The allocated region in which to render.

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

setSize

public void setSize(float width,
 float height)

Overrides:

setSize in class View

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.

viewToModel

public int viewToModel(float fx,
 float fy,
 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:

fx - the X coordinate >= 0

fy - the Y coordinate >= 0

a - the allocated region to render into

Returns:

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

yForLine

public int yForLine(Rectangle alloc,
 int line)

yForLineContaining

public int yForLineContaining(Rectangle alloc,
 int offs)
                       throws BadLocationException

Throws:

BadLocationException