org.eclipse.ltk.ui.refactoring/src/org/eclipse/ltk/internal/ui/refactoring/util/PixelConverter.java

/*******************************************************************************
 * Copyright (c) 2005 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ltk.internal.ui.refactoring.util;

import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Control;

import org.eclipse.jface.dialogs.Dialog;

/**
 * Utility class for pixel-related functions.
 */
public final class PixelConverter {

	private FontMetrics fFontMetrics;

	public PixelConverter(Control control) {
		GC gc= null;
		try {
			gc= new GC(control);
			gc.setFont(control.getFont());
			fFontMetrics= gc.getFontMetrics();
		} finally {
			if (gc != null)
				gc.dispose();
		}
	}

	public int convertHeightInCharsToPixels(int chars) {
		return Dialog.convertHeightInCharsToPixels(fFontMetrics, chars);
	}

	public int convertHorizontalDLUsToPixels(int dlus) {
		return Dialog.convertHorizontalDLUsToPixels(fFontMetrics, dlus);
	}

	public int convertVerticalDLUsToPixels(int dlus) {
		return Dialog.convertVerticalDLUsToPixels(fFontMetrics, dlus);
	}

	public int convertWidthInCharsToPixels(int chars) {
		return Dialog.convertWidthInCharsToPixels(fFontMetrics, chars);
	}
}