/******************************************************************************* * 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 Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.graphics;import org.eclipse.swt.internal.win32.*;import org.eclipse.swt.*;/** * Instances of this class manage operating system resources that * define how text looks when it is displayed. Fonts may be constructed * by providing a device and either name, size and style information * or a <code>FontData</code> object which encapsulates this data. * <p> * Application code must explicitly invoke the <code>Font.dispose()</code>  * method to release the operating system resources managed by each instance * when those instances are no longer required. * </p> * * @see FontData */public final class Font {		/**	 * the handle to the OS font resource	 * (Warning: This field is platform dependent)	 */	public int handle;		/**	 * the device where this font was created	 */	Device device;	/** * Prevents uninitialized instances from being created outside the package. */Font() {}/**	  * Constructs a new font given a device and font data * which describes the desired font's appearance. * <p> * You must dispose the font when it is no longer required.  * </p> * * @param device the device to create the font on * @param fd the FontData that describes the desired font (must not be null) *  * @exception IllegalArgumentException <ul> *    <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> *    <li>ERROR_NULL_ARGUMENT - if the fd argument is null</li> * </ul> * @exception SWTError <ul> *    <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li> * </ul> */public Font(Device device, FontData fd) {	if (device == null) device = Device.getDevice();	if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);	init(device, fd);	if (device.tracking) device.new_Object(this);	}/**	  * Constructs a new font given a device and an array * of font data which describes the desired font's * appearance. * <p> * You must dispose the font when it is no longer required.  * </p> * * @param device the device to create the font on * @param fds the array of FontData that describes the desired font (must not be null) *  * @exception IllegalArgumentException <ul> *    <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> *    <li>ERROR_NULL_ARGUMENT - if the fds argument is null</li> *    <li>ERROR_INVALID_ARGUMENT - if the length of fds is zero</li> *    <li>ERROR_NULL_ARGUMENT - if any fd in the array is null</li> * </ul> * @exception SWTError <ul> *    <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li> * </ul> *  * @since 2.1 */public Font(Device device, FontData[] fds) {	if (device == null) device = Device.getDevice();	if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);	if (fds == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);	if (fds.length == 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);	init(device, fds[0]);	if (device.tracking) device.new_Object(this);	}/**	  * Constructs a new font given a device, a font name, * the height of the desired font in points, and a font * style. * <p> * You must dispose the font when it is no longer required.  * </p> * * @param device the device to create the font on * @param name the name of the font (must not be null) * @param height the font height in points * @param style a bit or combination of NORMAL, BOLD, ITALIC *  * @exception IllegalArgumentException <ul> *    <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> *    <li>ERROR_NULL_ARGUMENT - if the name argument is null</li> *    <li>ERROR_INVALID_ARGUMENT - if the height is negative</li> * </ul> * @exception SWTError <ul> *    <li>ERROR_NO_HANDLES - if a font could not be created from the given arguments</li> * </ul> */public Font(Device device, String name, int height, int style) {	if (device == null) device = Device.getDevice();	if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);	if (name == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);	init(device, new FontData (name, height, style));	if (device.tracking) device.new_Object(this);	}/** * Disposes of the operating system resources associated with * the font. Applications must dispose of all fonts which * they allocate. */public void dispose() {	if (handle == 0) return;	if (device.isDisposed()) return;	OS.DeleteObject(handle);	handle = 0;	if (device.tracking) device.dispose_Object(this);	device = null;}/** * 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 Font)) return false;	Font font = (Font) object;	return device == font.device && handle == font.handle;}/** * Returns an array of <code>FontData</code>s representing the receiver. * On Windows, only one FontData will be returned per font. On X however,  * a <code>Font</code> object <em>may</em> be composed of multiple X  * fonts. To support this case, we return an array of font data objects. * * @return an array of font data objects describing the receiver * * @exception SWTException <ul> *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */public FontData[] getFontData() {	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);	LOGFONT logFont = OS.IsUnicode ? (LOGFONT)new LOGFONTW() : new LOGFONTA();	OS.GetObject(handle, LOGFONT.sizeof, logFont);	return new FontData[] {FontData.win32_new(logFont, device.computePoints(logFont))};}/** * Returns an integer hash code for the receiver. Any two  * objects which 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 () {	return handle;}void init (Device device, FontData fd) {	if (fd == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);	this.device = device;	LOGFONT logFont = fd.data;	int lfHeight = logFont.lfHeight;	logFont.lfHeight = device.computePixels(fd.height);	handle = OS.CreateFontIndirect(logFont);	logFont.lfHeight = lfHeight;	if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);}/** * Returns <code>true</code> if the font has been disposed, * and <code>false</code> otherwise. * <p> * This method gets the dispose state for the font. * When a font has been disposed, it is an error to * invoke any other method using the font. * * @return <code>true</code> when the font is disposed and <code>false</code> otherwise */public boolean isDisposed() {	return handle == 0;}/** * Returns a string containing a concise, human-readable * description of the receiver. * * @return a string representation of the receiver */public String toString () {	if (isDisposed()) return "Font {*DISPOSED*}";	return "Font {" + handle + "}";}/**	  * Invokes platform specific functionality to allocate a new font. * <p> * <b>IMPORTANT:</b> This method is <em>not</em> part of the public * API for <code>Font</code>. 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 called from * application code. * </p> * * @param device the device on which to allocate the color * @param handle the handle for the font * @return a new font object containing the specified device and handle */public static Font win32_new(Device device, int handle) {	if (device == null) device = Device.getDevice();	Font font = new Font();	font.handle = handle;	font.device = device;	return font;}}