| /******************************************************************************* |
| * Copyright (c) 2000, 2010 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.swt.graphics; |
| |
| |
| import org.eclipse.swt.internal.photon.*; |
| |
| /** |
| * Instances of this class provide measurement information |
| * about fonts including ascent, descent, height, leading |
| * space between rows, and average character width. |
| * <code>FontMetrics</code> are obtained from <code>GC</code>s |
| * using the <code>getFontMetrics()</code> method. |
| * |
| * @see GC#getFontMetrics |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| */ |
| public final class FontMetrics { |
| |
| /** |
| * On Windows, handle is a Win32 TEXTMETRIC struct |
| * On Photon, handle is a Photon FontQueryInfo struct |
| * (Warning: This field is platform dependent) |
| * <p> |
| * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT |
| * public API. It is marked public only so that it can be shared |
| * within the packages provided by SWT. It is not available on all |
| * platforms and should never be accessed from application code. |
| * </p> |
| * |
| * @noreference This field is not intended to be referenced by clients. |
| */ |
| public FontQueryInfo handle; |
| |
| FontMetrics() { |
| } |
| |
| /** |
| * Compares the argument to the receiver, and returns true |
| * if they represent the <em>same</em> object using a class |
| * specific comparison. |
| * |
| * @param object the object to compare with this object |
| * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise |
| * |
| * @see #hashCode |
| */ |
| public boolean equals (Object object) { |
| if (object == this) return true; |
| if (!(object instanceof FontMetrics)) return false; |
| FontQueryInfo info = ((FontMetrics)object).handle; |
| if (info == handle) return true; |
| if (info == null || handle == null) return false; |
| if (handle.size == info.size && |
| handle.style == info.style && |
| handle.ascender == info.ascender && |
| handle.descender == info.descender && |
| handle.width == info.width && |
| handle.lochar == info.lochar && |
| handle.hichar == info.hichar && |
| handle.desc.length == info.desc.length && |
| handle.font.length == info.font.length) |
| { |
| for (int i = handle.desc.length - 1; i >= 0; i--) { |
| if (handle.desc[i] != info.desc[i]) return false; |
| } |
| for (int i = handle.font.length - 1; i >= 0; i--) { |
| if (handle.font[i] != info.font[i]) return false; |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Returns the ascent of the font described by the receiver. A |
| * font's <em>ascent</em> is the distance from the baseline to the |
| * top of actual characters, not including any of the leading area, |
| * measured in pixels. |
| * |
| * @return the ascent of the font |
| */ |
| public int getAscent() { |
| return -handle.ascender; |
| } |
| |
| /** |
| * Returns the average character width, measured in pixels, |
| * of the font described by the receiver. |
| * |
| * @return the average character width of the font |
| */ |
| public int getAverageCharWidth() { |
| if ((handle.style & OS.PHFONT_INFO_FIXED) != 0) return handle.width; |
| return handle.width / 3; |
| } |
| |
| /** |
| * Returns the descent of the font described by the receiver. A |
| * font's <em>descent</em> is the distance from the baseline to the |
| * bottom of actual characters, not including any of the leading area, |
| * measured in pixels. |
| * |
| * @return the descent of the font |
| */ |
| public int getDescent() { |
| return handle.descender; |
| } |
| |
| /** |
| * Returns the height of the font described by the receiver, |
| * measured in pixels. A font's <em>height</em> is the sum of |
| * its ascent, descent and leading area. |
| * |
| * @return the height of the font |
| * |
| * @see #getAscent |
| * @see #getDescent |
| * @see #getLeading |
| */ |
| public int getHeight() { |
| return -handle.ascender + handle.descender; |
| } |
| |
| /** |
| * Returns the leading area of the font described by the |
| * receiver. A font's <em>leading area</em> is the space |
| * above its ascent which may include accents or other marks. |
| * |
| * @return the leading space of the font |
| */ |
| public int getLeading() { |
| return 0; |
| } |
| |
| /** |
| * Returns an integer hash code for the receiver. Any two |
| * objects that return <code>true</code> when passed to |
| * <code>equals</code> must return the same value for this |
| * method. |
| * |
| * @return the receiver's hash |
| * |
| * @see #equals |
| */ |
| public int hashCode() { |
| if (handle == null) return 0; |
| return handle.size ^ handle.style ^ handle.ascender ^ |
| handle.descender ^ handle.width ^ |
| handle.lochar ^ handle.hichar ^ handle.font.hashCode() ^ |
| handle.desc.hashCode(); |
| } |
| |
| public static FontMetrics internal_new(int ascent, int descent, int aveCharWidth, int leading, int height) { |
| FontQueryInfo info = new FontQueryInfo(); |
| info.ascender = (short)-ascent; |
| info.descender = (short)descent; |
| info.style = OS.PHFONT_INFO_FIXED; |
| info.width = (short)aveCharWidth; |
| return photon_new(info); |
| } |
| |
| public static FontMetrics photon_new(FontQueryInfo handle) { |
| FontMetrics fontMetrics = new FontMetrics(); |
| fontMetrics.handle = handle; |
| return fontMetrics; |
| } |
| } |