| /******************************************************************************* |
| * Copyright (c) 2000, 2004 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.ui.internal.forms.widgets; |
| |
| import org.eclipse.swt.graphics.FontMetrics; |
| import org.eclipse.swt.graphics.GC; |
| import org.eclipse.swt.widgets.Control; |
| |
| public class PixelConverter { |
| /** |
| * Number of horizontal dialog units per character, value <code>4</code>. |
| */ |
| private static final int HORIZONTAL_DIALOG_UNIT_PER_CHAR = 4; |
| |
| private FontMetrics fFontMetrics; |
| |
| public PixelConverter(Control control) { |
| GC gc = new GC(control); |
| gc.setFont(control.getFont()); |
| fFontMetrics = gc.getFontMetrics(); |
| gc.dispose(); |
| } |
| |
| /** |
| * @see DialogPage#convertHorizontalDLUsToPixels |
| */ |
| public int convertHorizontalDLUsToPixels(int dlus) { |
| // round to the nearest pixel |
| return (fFontMetrics.getAverageCharWidth() * dlus + HORIZONTAL_DIALOG_UNIT_PER_CHAR / 2) |
| / HORIZONTAL_DIALOG_UNIT_PER_CHAR; |
| } |
| } |