org.eclipse.swt.graphics.Font Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2002, 2013 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 static org.eclipse.rap.rwt.internal.service.ContextProvider.getApplicationContext;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.SWTException;
/**
* Instances of this class manage resources that define how text looks when it
* is displayed.
*
* @see FontData
* @since 1.0
*/
public final class Font extends Resource {
private final FontData internalFontData;
// used by ResourceFactory#getFont()
private Font( FontData fontData ) {
super( null );
internalFontData = findFontData( fontData );
}
/**
* Constructs a new font given a device and font data
* which describes the desired font's appearance.
*
* You must dispose the font when it is no longer required.
*
*
* @param device the device to create the font on
* @param fontData the FontData that describes the desired font (must not be null)
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if device is null and there is no current device
* - ERROR_NULL_ARGUMENT - if the fontData argument is null
*
* @exception SWTError
* - ERROR_NO_HANDLES - if a font could not be created from the given font data
*
*
* @since 1.3
*/
public Font( Device device, FontData fontData ) {
super( checkDevice( device ) );
if( fontData == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
internalFontData = findFontData( fontData );
}
/**
* Constructs a new font given a device and an array
* of font data which describes the desired font's
* appearance.
*
* You must dispose the font when it is no longer required.
*
*
* @param device the device to create the font on
* @param fontData the array of FontData that describes the desired font (must not be null)
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if device is null and there is no current device
* - ERROR_NULL_ARGUMENT - if the fontData argument is null
* - ERROR_INVALID_ARGUMENT - if the length of fontData is zero
* - ERROR_NULL_ARGUMENT - if any font data in the array is null
*
* @exception SWTError
* - ERROR_NO_HANDLES - if a font could not be created from the given font data
*
*
* @since 1.3
*/
public Font( Device device, FontData[] fontData ) {
super( checkDevice( device ) );
if( fontData == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
if( fontData.length == 0 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
for( int i = 0; i < fontData.length; i++ ) {
if( fontData[ i ] == null ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
}
internalFontData = findFontData( fontData[ 0 ] );
}
/**
* Constructs a new font given a device, a font name,
* the height of the desired font in points, and a font
* style.
*
* You must dispose the font when it is no longer required.
*
*
* @param device the device to create the font on
* @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 - if device is null and there is no current device
* - ERROR_NULL_ARGUMENT - if the name argument is null
* - ERROR_INVALID_ARGUMENT - if the height is negative
*
* @exception SWTError
* - ERROR_NO_HANDLES - if a font could not be created from the given arguments
*
*/
public Font( Device device, String name, int height, int style ) {
super( checkDevice( device ) );
if( name == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
if( height < 0 ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
FontData fontData = new FontData( name, height, style );
internalFontData = findFontData( fontData );
}
/**
* Returns an array of FontDatas representing the receiver.
*
*
* @return an array of font data objects describing the receiver
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public FontData[] getFontData() {
if( isDisposed() ) {
SWT.error( SWT.ERROR_GRAPHIC_DISPOSED );
}
FontData fontData = new FontData( internalFontData.getName(),
internalFontData.getHeight(),
internalFontData.getStyle() );
return new FontData[] { fontData };
}
@Override
public boolean equals( Object object ) {
boolean result;
if( object == this ) {
result = true;
} else if( object instanceof Font ) {
Font font = ( Font )object;
result = font.internalFontData.equals( internalFontData );
} else {
result = false;
}
return result;
}
@Override
public int hashCode() {
return internalFontData.hashCode() * 7;
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the receiver
*/
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append( "Font {" );
buffer.append( internalFontData.getName() );
buffer.append( "," );
buffer.append( internalFontData.getHeight() );
buffer.append( "," );
int style = internalFontData.getStyle();
String styleName;
if( ( style & SWT.BOLD ) != 0 && ( style & SWT.ITALIC ) != 0 ) {
styleName = "BOLD|ITALIC";
} else if( ( style & SWT.BOLD ) != 0 ) {
styleName = "BOLD";
} else if( ( style & SWT.ITALIC ) != 0 ) {
styleName = "ITALIC";
} else {
styleName = "NORMAL";
}
buffer.append( styleName );
buffer.append( "}" );
return buffer.toString();
}
private static FontData findFontData( FontData fontData ) {
return getApplicationContext().getFontDataFactory().findFontData( fontData );
}
}