org.eclipse.swt.graphics.FontData Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2002, 2012 Innoopract Informationssysteme GmbH and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Innoopract Informationssysteme GmbH - initial API and implementation
* EclipseSource - ongoing development
******************************************************************************/
package org.eclipse.swt.graphics;
import org.eclipse.swt.SWT;
import org.eclipse.swt.internal.SerializableCompatibility;
/**
* Instances of this class describe fonts.
*
* Application code does not need to explicitly release the
* resources managed by each instance when those instances are no longer
* required, and thus no dispose() method is provided.
*
* @see Font
* @since 1.0
*/
public final class FontData implements SerializableCompatibility {
private String name;
private int height;
private int style;
private String locale;
/**
* Constructs a new uninitialized font data.
* @since 1.4
*/
public FontData() {
this( "", 12, SWT.NORMAL );
}
/**
* Constructs a new font data given a font name,
* the height of the desired font in points,
* and a font style.
*
* @param name the name of the font (must not be null)
* @param height the font height in points
* @param style a bit or combination of NORMAL, BOLD, ITALIC
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - when the font name is null
* - ERROR_INVALID_ARGUMENT - if the height is negative
*
*/
public FontData( String name, int height, int style ) {
if( name == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
if( height < 0 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
this.name = name;
this.height = height;
this.style = checkFontStyle( style );
this.locale = "";
}
/**
* Constructs a new FontData given a string representation
* in the form generated by the FontData.toString
* method.
*
*
* @param string the string representation of a FontData (must not be null)
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the argument is null
* - ERROR_INVALID_ARGUMENT - if the argument does not represent a valid description
*
*
* @see #toString
*/
public FontData( String string ) {
if( string == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
int start = 0;
int end = string.indexOf( '|' );
if( end == -1 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
String version1 = string.substring( start, end );
try {
if( Integer.parseInt( version1 ) != 1 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
} catch( NumberFormatException e ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
start = end + 1;
end = string.indexOf( '|', start );
if( end == -1 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
String name = string.substring( start, end );
start = end + 1;
end = string.indexOf( '|', start );
if( end == -1 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
int height = 0;
try {
height = Integer.parseInt( string.substring( start, end ) );
} catch( NumberFormatException e ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
start = end + 1;
end = string.indexOf( '|', start );
if( end == -1 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
int style = 0;
try {
style = Integer.parseInt( string.substring( start, end ) );
} catch( NumberFormatException e ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
start = end + 1;
end = string.indexOf( '|', start );
this.name = name;
this.height = height;
this.style = style;
this.locale = "";
}
/**
* Returns a string representation of the receiver which is suitable for
* constructing an equivalent instance using the FontData(String)
* constructor.
*
* @return a string representation of the FontData
*/
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append( "1|" ); //$NON-NLS-1$
buffer.append( getName() );
buffer.append( "|" ); //$NON-NLS-1$
buffer.append( getHeight() );
buffer.append( "|" ); //$NON-NLS-1$
buffer.append( getStyle() );
buffer.append( "|" ); //$NON-NLS-1$
return buffer.toString();
}
/**
* Returns the height of the receiver in points.
*
* @return the height of this FontData
* @see #setHeight(int)
*/
public int getHeight() {
return height;
}
/**
* Returns the name of the receiver.
*
* @return the name of this FontData
* @see #setName
*/
public String getName() {
return name;
}
/**
* Returns the style of the receiver which is a bitwise OR of
* one or more of the SWT constants NORMAL, BOLD
* and ITALIC.
*
* @return the style of this FontData
* @see #setStyle
*/
public int getStyle() {
return style;
}
/**
* Returns the locale of the receiver.
*
* The locale determines which platform character set this
* font is going to use. Widgets and graphics operations that
* use this font will convert UNICODE strings to the platform
* character set of the specified locale.
*
*
* On platforms where there are multiple character sets for a
* given language/country locale, the variant portion of the
* locale will determine the character set.
*
*
* @return the String representing a Locale object
* @since 1.3
*/
public String getLocale () {
return locale;
}
/**
* Sets the height of the receiver. The parameter is
* specified in terms of points, where a point is one
* seventy-second of an inch.
*
* @param height the height of the FontData
*
* @exception IllegalArgumentException
* - ERROR_INVALID_ARGUMENT - if the height is negative
*
*
* @see #getHeight
* @since 1.4
*/
public void setHeight( int height ) {
if( height < 0 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
this.height = height;
}
/**
* Sets the name of the receiver.
*
* @param name the name of the font data (must not be null)
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - when the font name is null
*
*
* @see #getName
* @since 1.4
*/
public void setName( String name ) {
if( name == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
this.name = name;
}
/**
* Sets the style of the receiver to the argument which must
* be a bitwise OR of one or more of the SWT
* constants NORMAL, BOLD and ITALIC. All other style bits are
* ignored.
*
* @param style the new style for this FontData
*
* @see #getStyle
* @since 1.4
*/
public void setStyle( int style ) {
this.style = style;
}
/**
* Sets the locale of the receiver.
*
* The locale determines which platform character set this
* font is going to use. Widgets and graphics operations that
* use this font will convert UNICODE strings to the platform
* character set of the specified locale.
*
*
* On platforms where there are multiple character sets for a
* given language/country locale, the variant portion of the
* locale will determine the character set.
*
*
* @param locale the String representing a Locale object
* @see java.util.Locale#toString
* @since 1.4
*/
public void setLocale( String locale ) {
String result = "";
if( locale != null ) {
int length = locale.length();
if( length > 0 ) {
char sep = '_';
result = locale;
for( int i = 0; i < 2; i++ ) {
if( length > 0 && result.charAt( 0 ) == sep ) {
result = result.substring( 1 );
length -= 1;
}
}
if( length > 0 && result.charAt( length - 1 ) == sep ) {
result = result.substring( 0, length - 1 );
}
}
}
this.locale = result;
}
/**
* Compares the argument to the receiver, and returns true
* if they represent the same object using a class
* specific comparison.
*
* @param obj the object to compare with this object
* @return true if the object is the same as this object and false otherwise
*
* @see #hashCode
*/
public boolean equals( Object obj ) {
boolean result = false;
if( obj instanceof FontData ) {
FontData toCompare = ( FontData )obj;
// name can never be null
result = name.equals( toCompare.name )
&& height == toCompare.height
&& style == toCompare.style;
}
return result;
}
/**
* Returns an integer hash code for the receiver. Any two
* objects that return true when passed to
* equals must return the same value for this
* method.
*
* @return the receiver's hash
*
* @see #equals
*/
public int hashCode() {
return name.hashCode() ^ height << 8 ^ style;
}
private static int checkFontStyle( int style ) {
int result = SWT.NORMAL;
if( ( style & SWT.BOLD ) != 0 ) {
result |= SWT.BOLD;
}
if( ( style & SWT.ITALIC ) != 0 ) {
result |= SWT.ITALIC;
}
return result;
}
}