changeset 7:ac97aa23bcb7

FontMetrics
author Frank Benoit <benoit@tionex.de>
date Fri, 25 Jan 2008 13:56:20 +0100
parents 6696f884b8a6
children 4287bcee9960
files dwt/graphics/FontMetrics.d
diffstat 1 files changed, 135 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/graphics/FontMetrics.d	Fri Jan 25 13:56:20 2008 +0100
@@ -0,0 +1,135 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 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
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwt.graphics.FontMetrics;
+
+
+/**
+ * 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
+ */
+public final class FontMetrics {
+    int ascent, descent, averageCharWidth, leading, height;
+
+package this() {
+}
+
+/**
+ * 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 int opEquals (Object object) {
+    if (object is this) return true;
+    if( auto metrics = cast(FontMetrics)object ){
+        return ascent == metrics.ascent && descent == metrics.descent &&
+            averageCharWidth == metrics.averageCharWidth && leading == metrics.leading &&
+            height == metrics.height;
+    }
+    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 ascent;
+}
+
+/**
+ * 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() {
+    return averageCharWidth;
+}
+
+/**
+ * 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 descent;
+}
+
+/**
+ * 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 height;
+}
+
+/**
+ * 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 leading;
+}
+
+public static FontMetrics gtk_new(int ascent, int descent, int averageCharWidth, int leading, int height) {
+    FontMetrics fontMetrics = new FontMetrics();
+    fontMetrics.ascent = ascent;
+    fontMetrics.descent = descent;
+    fontMetrics.averageCharWidth = averageCharWidth;
+    fontMetrics.leading = leading;
+    fontMetrics.height = height;
+    return fontMetrics;
+}
+
+/**
+ * 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 hash_t toHash() {
+    return ascent ^ descent ^ averageCharWidth ^ leading ^ height;
+}
+
+}