com.raelity.jvi.swing
Class TextViewCache

java.lang.Object
  com.raelity.jvi.swing.TextViewCache

All Implemented Interfaces:

PropertyChangeListener, EventListener, ChangeListener

public class TextViewCache
extends Object
implements PropertyChangeListener, ChangeListener

This class caches information about the various components that make up the VI model. This class listens to these components as needed to keep the cache up to date. All info is derived through a JEditorPane.

Nested Class Summary

static class

TextViewCache.FreezeViewport Stabilize (do not allow scrolling) the JViewport displaying the indicated JEditorPane.

Field Summary

static BooleanOption

cacheTrace

Constructor Summary

TextViewCache(TextView textView)

Method Summary

void	attach(JEditorPane editor) This is called from the managing textview, listen to things that affect the cache.
void	detach(JEditorPane ep) Dissassociate from the observed components.
protected void	fillLinePositions()
protected void	fillLinePositionsFinally() determine document indicators visible in the viewport
ViFPOS	getCursor()
int	getFheight()
int	getViewBlankLines()
int	getViewBottomLine()
int	getViewLines()
JViewport	getViewport()
int	getViewTopLine()
Rectangle	modelToView(int offset)
void	propertyChange(PropertyChangeEvent e)
void	setViewTopLine(int line)
void	shutdown(JEditorPane ep)
void	stateChanged(ChangeEvent e)

Methods inherited from class java.lang.Object

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

Field Detail

cacheTrace

public static BooleanOption cacheTrace

Constructor Detail

TextViewCache

public TextViewCache(TextView textView)

Method Detail

getCursor

public final ViFPOS getCursor()

getViewport

public final JViewport getViewport()

getFheight

public final int getFheight()

getViewTopLine

public int getViewTopLine()

Returns:

the top line number

setViewTopLine

public void setViewTopLine(int line)

getViewBottomLine

public int getViewBottomLine()

getViewBlankLines

public int getViewBlankLines()

getViewLines

public int getViewLines()

Returns:

number of lines on viewport

fillLinePositions

protected void fillLinePositions()

fillLinePositionsFinally

protected void fillLinePositionsFinally()

determine document indicators visible in the viewport

modelToView

public Rectangle modelToView(int offset)
                      throws BadLocationException

Throws:

BadLocationException

attach

public void attach(JEditorPane editor)

This is called from the managing textview, listen to things that affect the cache.

detach

public void detach(JEditorPane ep)

Dissassociate from the observed components.

shutdown

public void shutdown(JEditorPane ep)

propertyChange

public void propertyChange(PropertyChangeEvent e)

Specified by:

propertyChange in interface PropertyChangeListener

stateChanged

public void stateChanged(ChangeEvent e)

Specified by:

stateChanged in interface ChangeListener