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/*******************************************************************************
* Copyright (c) 2015, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.viewers;
import org.eclipse.jface.viewers.StyledString.Styler;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.TextStyle;
/**
* Provides {@link Styler} that applies bold style on the given font.
*
* @since 3.18
*/
public final class BoldStylerProvider {
private Font fFont;
private Font fBoldFont;
private Styler fBoldStyler;
/**
* Creates a {@link BoldStylerProvider} instance which uses the given font.
*
* @param font the font to use for creating the bold font
*/
public BoldStylerProvider(Font font) {
fFont= font;
}
/**
* Disposes the bold font created for the styler.
*/
public void dispose() {
if (fBoldFont != null) {
fBoldFont.dispose();
fBoldFont= null;
}
}
/**
* Returns a {@link Styler} that applies bold style to the given {@link TextStyle}'s font.
*
* @return a bold styler
*/
public Styler getBoldStyler() {
if (fBoldStyler == null) {
fBoldStyler= new Styler() {
@Override
public void applyStyles(TextStyle textStyle) {
textStyle.font= getBoldFont();
}
};
}
return fBoldStyler;
}
/**
* Creates (if not already done) and returns the bold font used by the styler to apply the bold
* style.
*
*
* Note: The callers must not cache and re-use the returned font outside the
* current call.
*
*
* @return the bold font used by the styler
*/
public Font getBoldFont() {
if (fBoldFont == null) {
FontData[] data= fFont.getFontData();
for (FontData element : data) {
element.setStyle(SWT.BOLD);
}
fBoldFont= new Font(fFont.getDevice(), data);
}
return fBoldFont;
}
/**
* Returns the font used by the styler to create the bold font.
*
* @return the font used for creating the bold font
*/
public Font getFont() {
return fFont;
}
}