| package org.eclipse.swt.graphics;
|
|
|
| /*
|
| * Copyright (c) 2000, 2002 IBM Corp. All rights reserved. |
| * This file is 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
|
| */
|
|
|
| import org.eclipse.swt.internal.*;
|
| import org.eclipse.swt.internal.photon.*;
|
| 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 byte[] handle;
|
|
|
| /**
|
| * the device where this font was created
|
| */ |
| Device device;
|
|
|
| static final byte[] DefaultFontName;
|
| static final byte[] DefaultFont;
|
|
|
| static {
|
| DefaultFontName = Converter.wcsToMbcs(null, "TextFont", true);
|
| DefaultFont = Converter.wcsToMbcs(null, "TextFont09", true);
|
| }
|
|
|
| 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);
|
| if (fd == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
|
| init(device, fd.getName(), fd.getHeight(), fd.getStyle(), fd.stem);
|
| 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, name, height, style, null);
|
| 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 == null) return;
|
|
|
| handle = null;
|
| 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;
|
| byte[] h = ((Font)object).handle;
|
| if (h == handle) return true;
|
| if (h == null || handle == null) return false;
|
| int end = Math.min(h.length, handle.length);
|
| for (int i=0; i<end; i++) {
|
| if (handle[i] != h[i]) return false;
|
| if (handle[i] == 0) break;
|
| }
|
| return true;
|
| }
|
|
|
| /** |
| * 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);
|
| return new FontData[]{new FontData(handle)};
|
| }
|
|
|
| /** |
| * 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 () {
|
| if (handle == null) return 0;
|
| return handle.hashCode();
|
| }
|
|
|
| /** |
| * 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 == null;
|
| }
|
|
|
| void init(Device device, String name, int height, int style, byte[] stem) {
|
| if (height < 0) SWT.error(SWT.ERROR_NULL_ARGUMENT);
|
| this.device = device;
|
| if (stem != null) {
|
| handle = stem;
|
| } else {
|
| byte[] description = (name == null) ? null : Converter.wcsToMbcs(null, name, true);
|
| int osStyle = 0;
|
| if ((style & SWT.BOLD) != 0) osStyle |= OS.PF_STYLE_BOLD;
|
| if ((style & SWT.ITALIC) != 0) osStyle |= OS.PF_STYLE_ITALIC;
|
| byte[] buffer = new byte[OS.MAX_FONT_TAG];
|
| handle = OS.PfGenerateFontName(description, osStyle, height, buffer);
|
| if (handle == null) handle = OS.PfGenerateFontName(DefaultFontName, osStyle, height, buffer);
|
| }
|
| if (handle == null) handle = DefaultFont;
|
| FontQueryInfo info = new FontQueryInfo();
|
| if (OS.PfQueryFontInfo(handle, info) == 0) handle = info.font;
|
| }
|
|
|
| public static Font photon_new(Device device, byte[] stem) {
|
| if (device == null) device = Device.getDevice();
|
| Font font = new Font();
|
| font.init(device, null, 0, 0, stem);
|
| return font;
|
| }
|
|
|
| /** |
| * 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*}";
|
| int index = 0;
|
| while (index < handle.length) {
|
| if (handle[index] == 0) break;
|
| index++;
|
| }
|
| String text = new String(handle, 0, index);
|
| return "Font {" + text + "}";
|
| }
|
|
|
| } |