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SwingFrontend.java
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SwingFrontend.java
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/**
* jVT220 - Java VT220 terminal emulator.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package nl.lxtreme.jvt220.terminal.swing;
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.image.*;
import java.io.*;
import java.text.*;
import java.util.*;
import java.util.List;
import javax.swing.*;
import nl.lxtreme.jvt220.terminal.*;
import nl.lxtreme.jvt220.terminal.ITerminal.ITextCell;
/**
* Provides a Swing frontend for {@link ITerminal}.
*/
public class SwingFrontend extends JComponent implements ITerminalFrontend
{
// INNER TYPES
/**
* Small container for the width, height and line spacing of a single
* character.
*/
static final class CharacterDimensions
{
final int m_height;
final int m_width;
final int m_lineSpacing;
/**
* Creates a new {@link CharacterDimensions} instance.
*
* @param width
* the width of a single character, in pixels;
* @param height
* the height of a single character, in pixels;
* @param lineSpacing
* the spacing to use between two lines with characters, in pixels.
*/
public CharacterDimensions( int width, int height, int lineSpacing )
{
m_width = width;
m_height = height;
m_lineSpacing = lineSpacing;
}
}
/**
* Asynchronous worker that reads data from an input stream and passes this to
* the terminal backend.
*/
final class InputStreamWorker extends SwingWorker<Void, Integer>
{
// VARIABLES
private final InputStreamReader m_reader;
// CONSTRUCTORS
/**
* Creates a new {@link InputStreamWorker} instance.
*
* @param inputStream
* the input stream to read from, cannot be <code>null</code>;
* @param encoding
* the character encoding to use for the read input, cannot be
* <code>null</code>.
*/
public InputStreamWorker( final InputStream inputStream, String encoding ) throws IOException
{
m_reader = new InputStreamReader( inputStream, encoding );
}
// METHODS
@Override
protected Void doInBackground() throws Exception
{
while ( !isCancelled() && !Thread.currentThread().isInterrupted() )
{
int r = m_reader.read();
if ( r > 0 )
{
publish( Integer.valueOf( r ) );
}
}
return null;
}
@Override
protected void process( final List<Integer> readChars )
{
Integer[] chars = readChars.toArray( new Integer[readChars.size()] );
try
{
writeCharacters( chars );
}
catch ( IOException exception )
{
exception.printStackTrace(); // XXX
}
}
}
// CONSTANTS
/**
* The default encoding to use for the I/O with the outer world.
*/
private static final String ISO8859_1 = "ISO8859-1";
// VARIABLES
private final String m_encoding;
private final CharBuffer m_buffer;
private ITerminalColorScheme m_colorScheme;
private ICursor m_oldCursor;
private volatile CharacterDimensions m_charDims;
private volatile BufferedImage m_image;
private volatile boolean m_listening;
private ITerminal m_terminal;
private InputStreamWorker m_inputStreamWorker;
private Writer m_writer;
// CONSTRUCTORS
/**
* Creates a new {@link SwingFrontend} instance using ISO8859-1 encoding.
*/
public SwingFrontend()
{
this( ISO8859_1 );
}
/**
* Creates a new {@link SwingFrontend} instance.
*
* @param encoding
* the character encoding to use for the terminal.
*/
public SwingFrontend( String encoding )
{
if ( encoding == null || "".equals( encoding.trim() ) )
{
throw new IllegalArgumentException( "Encoding cannot be null or empty!" );
}
m_encoding = encoding;
m_buffer = new CharBuffer();
m_colorScheme = new XtermColorScheme();
setFont( Font.decode( "Monospaced-PLAIN-14" ) );
mapKeyboard();
setEnabled( false );
setFocusable( true );
setFocusTraversalKeysEnabled( false ); // disables TAB handling
requestFocus();
}
// METHODS
/**
* Calculates the character dimensions for the given font, which is presumed
* to be a monospaced font.
*
* @param aFont
* the font to get the character dimensions for, cannot be
* <code>null</code>.
* @return an array of length 2, containing the character width and height (in
* that order).
*/
private static CharacterDimensions getCharacterDimensions( Font aFont )
{
BufferedImage im = new BufferedImage( 1, 1, BufferedImage.TYPE_INT_ARGB );
Graphics2D g2d = im.createGraphics();
g2d.setFont( aFont );
FontMetrics fm = g2d.getFontMetrics();
g2d.dispose();
im.flush();
int w = fm.charWidth( '@' );
int h = fm.getAscent() + fm.getDescent();
return new CharacterDimensions( w, h, fm.getLeading() + 1 );
}
/**
* Calculates the union of two rectangles, allowing <code>null</code> values
* to be passed in.
*
* @param rect1
* the 1st rectangle to create the union, if <code>null</code>, the
* 2nd argument will be returned;
* @param rect2
* the 2nd rectangle to create the union, if <code>null</code>, the
* 1st argument will be returned.
* @return the union of the two given rectangles.
*/
private static Rectangle union( Rectangle rect1, Rectangle rect2 )
{
if ( rect2 == null )
{
return rect1;
}
if ( rect1 == null )
{
return rect2;
}
return rect1.union( rect2 );
}
/**
* Connects this frontend to a given input and output stream.
* <p>
* This method will start a background thread to read continuously from the
* given input stream.
* </p>
*
* @param inputStream
* the input stream to connect to, cannot be <code>null</code>;
* @param outputStream
* the output stream to connect to, cannot be <code>null</code>.
* @throws IOException
* in case of I/O problems.
*/
@Override
public void connect( InputStream inputStream, OutputStream outputStream ) throws IOException
{
if ( inputStream == null )
{
throw new IllegalArgumentException( "Input stream cannot be null!" );
}
if ( outputStream == null )
{
throw new IllegalArgumentException( "Output stream cannot be null!" );
}
disconnect();
m_writer = new OutputStreamWriter( outputStream, m_encoding );
m_inputStreamWorker = new InputStreamWorker( inputStream, m_encoding );
m_inputStreamWorker.execute();
setEnabled( true );
}
/**
* Connects this frontend to a given output stream.
* <p>
* NOTE: when using this method, you need to explicitly call
* {@link #writeCharacters(Integer...)} yourself in order to let anything
* appear on the terminal.
* </p>
*
* @param outputStream
* the output stream to connect to, cannot be <code>null</code>.
* @throws IOException
* in case of I/O problems.
*/
@Override
public void connect( OutputStream outputStream ) throws IOException
{
if ( outputStream == null )
{
throw new IllegalArgumentException( "Output stream cannot be null!" );
}
disconnect();
m_writer = new OutputStreamWriter( outputStream, m_encoding );
setEnabled( true );
}
/**
* Disconnects this frontend from any input and output stream.
*
* @throws IOException
* in case of I/O problems.
*/
@Override
public void disconnect() throws IOException
{
try
{
if ( m_inputStreamWorker != null )
{
m_inputStreamWorker.cancel( true /* mayInterruptIfRunning */);
m_inputStreamWorker = null;
}
if ( m_writer != null )
{
m_writer.close();
m_writer = null;
}
}
finally
{
setEnabled( false );
}
}
/**
* {@inheritDoc}
*/
@Override
public Dimension getMaximumTerminalSize()
{
Rectangle bounds = getGraphicsConfiguration().getBounds();
Insets insets = calculateTotalInsets();
int width = bounds.width - insets.left - insets.right;
int height = bounds.height - insets.top - insets.bottom;
CharacterDimensions charDims = m_charDims;
// Calculate the maximum number of columns & lines...
int columns = width / charDims.m_width;
int lines = height / ( charDims.m_height + charDims.m_lineSpacing );
return new Dimension( columns, lines );
}
/**
* Returns the current terminal.
*
* @return the terminal, can be <code>null</code>.
*/
public ITerminal getTerminal()
{
return m_terminal;
}
/**
* {@inheritDoc}
*/
@Override
public Writer getWriter()
{
return m_writer;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isListening()
{
return m_listening;
}
/**
* {@inheritDoc}
*/
@Override
public void setFont( Font font )
{
super.setFont( font );
m_charDims = getCharacterDimensions( font );
}
/**
* @see nl.lxtreme.jvt220.terminal.ITerminalFrontend#setReverse(boolean)
*/
@Override
public void setReverse( boolean reverse )
{
m_colorScheme.setInverted( reverse );
}
/**
* Sets the size of this component in pixels. Overridden in order to redirect
* this call to {@link #terminalSizeChanged(int, int)} with the correct number
* of columns and lines.
*/
@Override
public void setSize( int width, int height )
{
Rectangle bounds = getGraphicsConfiguration().getBounds();
Insets insets = calculateTotalInsets();
if ( width == 0 )
{
width = bounds.width - insets.left - insets.right;
}
else if ( width < 0 )
{
width = getWidth();
}
if ( height == 0 )
{
height = bounds.height - insets.top - insets.bottom;
}
else if ( height < 0 )
{
height = getHeight();
}
CharacterDimensions charDims = m_charDims;
int columns = width / charDims.m_width;
int lines = height / ( charDims.m_height + charDims.m_lineSpacing );
terminalSizeChanged( columns, lines );
}
/**
* {@inheritDoc}
*/
@Override
public void setTerminal( ITerminal terminal )
{
if ( terminal == null )
{
throw new IllegalArgumentException( "Terminal cannot be null!" );
}
m_terminal = terminal;
m_terminal.setFrontend( this );
}
/**
* {@inheritDoc}
*/
@Override
public void terminalChanged( final ITextCell[] cells, final BitSet heatMap )
{
SwingUtilities.invokeLater( new Runnable()
{
@Override
public void run()
{
updateTerminalImage( cells, heatMap );
}
} );
}
/**
* {@inheritDoc}
*/
@Override
public void terminalSizeChanged( final int columns, final int lines )
{
SwingUtilities.invokeLater( new Runnable()
{
@Override
public void run()
{
recreateTerminalImage( columns, lines, true /* forceRepaint */ );
}
} );
}
/**
* Writes the given sequence of characters directly to the terminal, similar
* as writing to the standard output.
*
* @param charSeq
* the sequence of characters to write, cannot be <code>null</code>.
* @throws IOException
* in case of I/O problems writing to the terminal.
*/
@Override
public void writeCharacters( CharSequence charSeq ) throws IOException
{
InputStream is = new ByteArrayInputStream( charSeq.toString().getBytes() );
InputStreamReader isr = new InputStreamReader( is, m_encoding );
int ch;
while ( ( ch = isr.read() ) >= 0 )
{
writeCharacters( ch );
}
}
/**
* Writes the given array of characters directly to the terminal, similar as
* writing to the standard output.
*
* @param chars
* the characters to write, cannot be <code>null</code>.
* @throws IOException
* in case of I/O problems writing to the terminal.
*/
@Override
public void writeCharacters( Integer... chars ) throws IOException
{
m_buffer.append( chars );
int n = m_terminal.read( m_buffer );
m_buffer.removeUntil( n );
}
/**
* Recreates the terminal image.
*
* @param columns
* the new number of columns, > 0;
* @param lines
* the new number of lines, > 0.
*/
void recreateTerminalImage( int columns, int lines, boolean forceRepaint )
{
assert SwingUtilities.isEventDispatchThread() : "Should be called from EDT only!";
final Dimension dims = calculateSizeInPixels( columns, lines );
if ( ( m_image == null ) || ( m_image.getWidth() != dims.width ) || ( m_image.getHeight() != dims.height ) )
{
if ( m_image != null )
{
m_image.flush();
}
m_image = getGraphicsConfiguration().createCompatibleImage( dims.width, dims.height );
Graphics2D canvas = m_image.createGraphics();
try
{
canvas.setBackground( m_colorScheme.getBackgroundColor() );
canvas.clearRect( 0, 0, m_image.getWidth(), m_image.getHeight() );
}
finally
{
canvas.dispose();
canvas = null;
}
// Update the size of this component as well...
Insets insets = getInsets();
super.setSize( dims.width + insets.left + insets.right, dims.height + insets.top + insets.bottom );
repaint( 50L );
}
}
/**
* Updates the image representing the terminal contents.
*
* @param cells
* the text cells;
* @param heatMap
* the heat map denoting the changed cells.
*/
void updateTerminalImage( ITextCell[] cells, BitSet heatMap )
{
assert SwingUtilities.isEventDispatchThread() : "Should be called from the EDT only!";
final int columns = m_terminal.getWidth();
final int lines = m_terminal.getHeight();
// Create copies of these data items to ensure they remain constant for
// the remainder of this method...
CharacterDimensions charDims = m_charDims;
int cw = charDims.m_width;
int ch = charDims.m_height;
int ls = charDims.m_lineSpacing;
if ( m_image == null )
{
// Ensure there's a valid image to paint on...
recreateTerminalImage( columns, lines, false /* forceRepaint */ );
}
final Graphics2D canvas = m_image.createGraphics();
canvas.setFont( getFont() );
final Font font = getFont();
final FontMetrics fm = canvas.getFontMetrics();
final FontRenderContext frc = new FontRenderContext( null, true /* aa */, true /* fractionalMetrics */);
Color cursorColor = null;
Rectangle repaintArea = null;
if ( m_oldCursor != null )
{
repaintArea = drawCursor( canvas, m_oldCursor, m_colorScheme.getBackgroundColor() );
}
for ( int i = 0; i < cells.length; i++ )
{
boolean cellChanged = heatMap.get( i );
if ( cellChanged )
{
// Cell is changed...
final ITextCell cell = cells[i];
final int x = ( i % columns ) * cw;
final int y = ( i / columns ) * ( ch + ls );
final Rectangle rect = new Rectangle( x, y, cw, ch + ls );
canvas.setColor( convertToColor( cell.getBackground(), m_colorScheme.getBackgroundColor() ) );
canvas.fillRect( rect.x, rect.y, rect.width, rect.height );
final String txt = Character.toString( cell.getChar() );
AttributedString attrStr = new AttributedString( txt );
cursorColor = applyAttributes( cell, attrStr, font );
AttributedCharacterIterator characterIterator = attrStr.getIterator();
LineBreakMeasurer measurer = new LineBreakMeasurer( characterIterator, frc );
while ( measurer.getPosition() < characterIterator.getEndIndex() )
{
TextLayout textLayout = measurer.nextLayout( getWidth() );
textLayout.draw( canvas, x, y + fm.getAscent() );
}
repaintArea = union( repaintArea, rect );
}
}
// Draw the cursor...
m_oldCursor = m_terminal.getCursor().clone();
if ( cursorColor == null )
{
cursorColor = m_colorScheme.getTextColor();
}
repaintArea = union( repaintArea, drawCursor( canvas, m_oldCursor, cursorColor ) );
// Free the resources...
canvas.dispose();
if ( repaintArea != null )
{
repaintArea.grow( 5, 3 );
repaint( repaintArea );
}
}
/**
* Maps the keyboard to respond to keys like 'up', 'down' and the function
* keys.
*/
protected void mapKeyboard()
{
mapKeystroke( KeyEvent.VK_UP );
mapKeystroke( KeyEvent.VK_DOWN );
mapKeystroke( KeyEvent.VK_RIGHT );
mapKeystroke( KeyEvent.VK_LEFT );
mapKeystroke( KeyEvent.VK_PAGE_DOWN );
mapKeystroke( KeyEvent.VK_PAGE_UP );
mapKeystroke( KeyEvent.VK_HOME );
mapKeystroke( KeyEvent.VK_END );
mapKeystroke( KeyEvent.VK_NUMPAD0 );
mapKeystroke( KeyEvent.VK_NUMPAD1 );
mapKeystroke( KeyEvent.VK_NUMPAD2 );
mapKeystroke( KeyEvent.VK_NUMPAD3 );
mapKeystroke( KeyEvent.VK_NUMPAD4 );
mapKeystroke( KeyEvent.VK_NUMPAD5 );
mapKeystroke( KeyEvent.VK_NUMPAD6 );
mapKeystroke( KeyEvent.VK_NUMPAD7 );
mapKeystroke( KeyEvent.VK_NUMPAD8 );
mapKeystroke( KeyEvent.VK_NUMPAD9 );
mapKeystroke( KeyEvent.VK_MINUS );
mapKeystroke( KeyEvent.VK_PLUS );
mapKeystroke( KeyEvent.VK_COMMA );
mapKeystroke( KeyEvent.VK_PERIOD );
mapKeystroke( KeyEvent.VK_ENTER );
mapKeystroke( KeyEvent.VK_KP_DOWN );
mapKeystroke( KeyEvent.VK_KP_LEFT );
mapKeystroke( KeyEvent.VK_KP_RIGHT );
mapKeystroke( KeyEvent.VK_KP_UP );
mapKeystroke( KeyEvent.VK_F1 );
mapKeystroke( KeyEvent.VK_F1, InputEvent.ALT_DOWN_MASK );
mapKeystroke( KeyEvent.VK_F2 );
mapKeystroke( KeyEvent.VK_F2, InputEvent.ALT_DOWN_MASK );
mapKeystroke( KeyEvent.VK_F3 );
mapKeystroke( KeyEvent.VK_F3, InputEvent.ALT_DOWN_MASK );
mapKeystroke( KeyEvent.VK_F4 );
mapKeystroke( KeyEvent.VK_F4, InputEvent.ALT_DOWN_MASK );
mapKeystroke( KeyEvent.VK_F5 );
mapKeystroke( KeyEvent.VK_F6 );
mapKeystroke( KeyEvent.VK_F7 );
mapKeystroke( KeyEvent.VK_F8 );
mapKeystroke( KeyEvent.VK_F9 );
mapKeystroke( KeyEvent.VK_F10 );
mapKeystroke( KeyEvent.VK_F11 );
mapKeystroke( KeyEvent.VK_F12 );
}
/**
* Maps the given keycode and modifiers to a terminal specific sequence.
*
* @param keycode
* the keycode to map;
* @param modifiers
* the modifiers to map.
* @return a terminal-specific sequence for the given input, or
* <code>null</code> if no specific sequence exists for this terminal.
*/
protected String mapKeyCode( int keycode, int modifiers )
{
return getTerminal().getKeyMapper().map( keycode, modifiers );
}
/**
* Creates a key mapping for the given keystroke and the given action which is
* send as literal text to the terminal.
*
* @param keycode
* the keycode to map.
*/
protected void mapKeystroke( int keycode )
{
mapKeystroke( keycode, 0 );
}
/**
* Creates a key mapping for the given keystroke and the given action which is
* send as literal text to the terminal.
*
* @param keycode
* the keycode to map;
* @param modifiers
* the modifiers to map.
*/
protected void mapKeystroke( int keycode, int modifiers )
{
final KeyStroke keystroke = KeyStroke.getKeyStroke( keycode, modifiers );
final String key = keystroke.toString();
getInputMap().put( keystroke, key );
}
/**
* {@inheritDoc}
*/
@Override
protected void paintComponent( Graphics canvas )
{
m_listening = false;
canvas.setColor( m_colorScheme.getBackgroundColor() );
Rectangle clip = canvas.getClipBounds();
canvas.fillRect( clip.x, clip.y, clip.width, clip.height );
try
{
Insets insets = getInsets();
canvas.drawImage( m_image, insets.left, insets.top, null /* observer */);
}
finally
{
m_listening = true;
}
}
/**
* {@inheritDoc}
*/
@Override
protected boolean processKeyBinding( KeyStroke keystroke, KeyEvent event, int condition, boolean pressed )
{
if ( !isEnabled() )
{
// Don't bother to process keys for a disabled component...
return false;
}
InputMap inputMap = getInputMap( condition );
ActionMap actionMap = getActionMap();
try
{
if ( ( inputMap != null ) && ( actionMap != null ) && ( event.getID() == KeyEvent.KEY_PRESSED ) )
{
Object binding = inputMap.get( keystroke );
if ( binding != null )
{
Action action = actionMap.get( binding );
if ( action != null )
{
// Normal action; invoke it...
return SwingUtilities.notifyAction( action, keystroke, event, this, event.getModifiers() );
}
else
{
// Keystroke we've mapped without an action, means we're going to
// test whether there's a mapping for it. If so, use that as
// response, otherwise respond with the 'regular' key...
String mapping = mapKeyCode( keystroke.getKeyCode(), keystroke.getModifiers() );
if ( mapping != null )
{
respond( mapping );
return true;
}
}
}
if ( isRegularKey( keystroke ) )
{
respond( event.getKeyChar() );
return true;
}
}
}
catch ( IOException exception )
{
exception.printStackTrace(); // XXX
}
return false;
}
/**
* Writes a given number of characters to the terminal.
*
* @param chars
* the characters to write, cannot be <code>null</code>.
* @throws IOException
* in case of I/O problems responding.
*/
protected void respond( char ch ) throws IOException
{
if ( m_writer != null )
{
m_writer.write( ch );
m_writer.flush();
}
}
/**
* Writes a given number of characters to the terminal.
*
* @param chars
* the characters to write, cannot be <code>null</code>.
* @throws IOException
* in case of I/O problems responding.
*/
protected void respond( String chars ) throws IOException
{
if ( m_writer != null )
{
m_writer.write( chars );
m_writer.flush();
}
}
/**
* Applies the attributes from the given {@link TextCell} to the given
* {@link AttributedString}.
*
* @param textCell
* the text cell to get the attributes from;
* @param attributedString
* the {@link AttributedString} to apply the attributes to;
* @param font
* the font to use.
* @return the primary foreground color, never <code>null</code>.
*/
private Color applyAttributes( ITextCell textCell, AttributedString attributedString, Font font )
{
Color fg = convertToColor( textCell.getForeground(), m_colorScheme.getTextColor() );
Color bg = convertToColor( textCell.getBackground(), m_colorScheme.getBackgroundColor() );
attributedString.addAttribute( TextAttribute.FAMILY, font.getFamily() );
attributedString.addAttribute( TextAttribute.SIZE, font.getSize() );
attributedString.addAttribute( TextAttribute.FOREGROUND, textCell.isReverse() ^ textCell.isHidden() ? bg : fg );
attributedString.addAttribute( TextAttribute.BACKGROUND, textCell.isReverse() ? fg : bg );
if ( textCell.isUnderline() )
{
attributedString.addAttribute( TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON );
}
if ( textCell.isBold() )
{
attributedString.addAttribute( TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD );
}
if ( textCell.isItalic() )
{
attributedString.addAttribute( TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE );
}
return textCell.isReverse() ^ textCell.isHidden() ? bg : fg;
}
/**
* Calculates the size (in pixels) of the back buffer image.
*
* @param columns
* the number of columns, > 0;
* @param lines
* the number of lines, > 0.
* @return a dimension with the image width and height in pixels.
*/
private Dimension calculateSizeInPixels( int columns, int lines )
{
CharacterDimensions charDims = m_charDims;
int width = ( columns * charDims.m_width );
int height = ( lines * ( charDims.m_height + charDims.m_lineSpacing ) );
return new Dimension( width, height );
}
/**
* Calculates the total insets of this container and all of its parents.
*
* @return the total insets, never <code>null</code>.
*/
private Insets calculateTotalInsets()
{
// Take the screen insets as starting point...
Insets insets = Toolkit.getDefaultToolkit().getScreenInsets( getGraphicsConfiguration() );
Container ptr = this;
do
{
Insets compInsets = ptr.getInsets();
insets.top += compInsets.top;
insets.bottom += compInsets.bottom;
insets.left += compInsets.left;
insets.right += compInsets.right;
ptr = ptr.getParent();
}
while ( ptr != null );
return insets;
}
/**
* Converts a given color index to a concrete color value.
*
* @param index
* the numeric color index, >= 0;
* @param defaultColor
* the default color to use, cannot be <code>null</code>.
* @return a color value, never <code>null</code>.
*/
private Color convertToColor( int index, Color defaultColor )
{
if ( index < 1 )
{
return defaultColor;
}
return m_colorScheme.getColorByIndex( index - 1 );
}
/**
* Draws the cursor on screen.
*
* @param canvas
* the canvas to paint on;
* @param cursor
* the cursor information;
* @param color
* the color to paint the cursor in.
*/
private Rectangle drawCursor( final Graphics2D canvas, final ICursor cursor, final Color color )
{
if ( !cursor.isVisible() )
{
return null;
}
CharacterDimensions charDims = m_charDims;
int cw = charDims.m_width;
int ch = charDims.m_height;
int ls = charDims.m_lineSpacing;