Package org.jline.terminal.impl

Class DoubleSizeCharacters

java.lang.Object

org.jline.terminal.impl.DoubleSizeCharacters

public class DoubleSizeCharacters
extends Object

Utility class for handling double-size characters in terminals.

Double-size characters are a feature supported by some terminals that allows displaying text at double width and/or double height. This is useful for creating banners, headers, or emphasizing important text.

The implementation uses VT100-compatible escape sequences: - ESC # 3: Double-height, double-width line (top half) - ESC # 4: Double-height, double-width line (bottom half) - ESC # 5: Single-width, single-height line (normal) - ESC # 6: Double-width, single-height line

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	DoubleSizeCharacters.Mode	Enumeration of double-size character modes.

Constructor Summary

Constructors

Constructor	Description
DoubleSizeCharacters()	Creates a new DoubleSizeCharacters instance.

Method Summary

Modifier and Type	Method	Description
static boolean	isDoubleSizeSupported(Terminal terminal)	Checks if the terminal supports double-size characters.
static void	printBanner(Terminal terminal, String text, char borderChar)	Creates a banner with the specified text using double-height characters.
static void	printDoubleHeight(Terminal terminal, String text)	Prints text in double height (both top and bottom halves).
static void	printDoubleWidth(Terminal terminal, String text)	Prints text in double width.
static void	printNormal(Terminal terminal, String text)	Prints text in normal size.
static void	reset(Terminal terminal)	Resets the terminal to normal character size.
static void	setMode(Terminal terminal, DoubleSizeCharacters.Mode mode)	Sets the double-size character mode for the current line.

Methods inherited from class java.lang.Object

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

Constructor Details

DoubleSizeCharacters

public DoubleSizeCharacters()

Creates a new DoubleSizeCharacters instance.

Method Details

isDoubleSizeSupported

public static boolean isDoubleSizeSupported(Terminal terminal)

Checks if the terminal supports double-size characters.

Parameters:

terminal - the terminal to check

Returns:

true if the terminal supports double-size characters, false otherwise

setMode

public static void setMode(Terminal terminal,
 DoubleSizeCharacters.Mode mode)
                    throws IOException

Sets the double-size character mode for the current line.

Parameters:

terminal - the terminal to write to

mode - the double-size mode to set

Throws:

IOException - if an I/O error occurs

printNormal

public static void printNormal(Terminal terminal,
 String text)
                        throws IOException

Prints text in normal size.

Parameters:

terminal - the terminal to write to

text - the text to print

Throws:

IOException - if an I/O error occurs

printDoubleWidth

public static void printDoubleWidth(Terminal terminal,
 String text)
                             throws IOException

Prints text in double width.

Parameters:

terminal - the terminal to write to

text - the text to print

Throws:

IOException - if an I/O error occurs

printDoubleHeight

public static void printDoubleHeight(Terminal terminal,
 String text)
                              throws IOException

Prints text in double height (both top and bottom halves). This method automatically handles printing both the top and bottom halves of double-height text.

Parameters:

terminal - the terminal to write to

text - the text to print

Throws:

IOException - if an I/O error occurs

printBanner

public static void printBanner(Terminal terminal,
 String text,
 char borderChar)
                        throws IOException

Creates a banner with the specified text using double-height characters. This is useful for creating prominent headers or titles.

Parameters:

terminal - the terminal to write to

text - the text for the banner

borderChar - the character to use for the border (e.g., '*', '=', '-')

Throws:

IOException - if an I/O error occurs

reset

public static void reset(Terminal terminal)
                  throws IOException

Resets the terminal to normal character size. This is useful to ensure the terminal is in a known state.

Parameters:

terminal - the terminal to reset

Throws:

IOException - if an I/O error occurs