| /******************************************************************************* |
| * Copyright (c) 2004, 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 |
| *******************************************************************************/ |
| package org.eclipse.jface.resource; |
| |
| import org.eclipse.swt.graphics.Device; |
| import org.eclipse.swt.graphics.Font; |
| import org.eclipse.swt.graphics.FontData; |
| |
| /** |
| * Describes a Font using an array of FontData |
| * |
| * @since 3.1 |
| */ |
| final class ArrayFontDescriptor extends FontDescriptor { |
| |
| private FontData[] data; |
| private Font originalFont = null; |
| private Device originalDevice = null; |
| |
| /** |
| * Creates a font descriptor for a font with the given name, height, |
| * and style. These arguments are passed directly to the constructor |
| * of Font. |
| * |
| * @param data FontData describing the font to create |
| * |
| * @see org.eclipse.swt.graphics.Font#Font(org.eclipse.swt.graphics.Device, org.eclipse.swt.graphics.FontData) |
| * @since 3.1 |
| */ |
| public ArrayFontDescriptor(FontData[] data) { |
| this.data = data; |
| } |
| |
| /** |
| * Creates a font descriptor that describes the given font. |
| * |
| * @param originalFont font to be described |
| * |
| * @see FontDescriptor#createFrom(org.eclipse.swt.graphics.Font) |
| * @since 3.1 |
| */ |
| public ArrayFontDescriptor(Font originalFont) { |
| this(originalFont.getFontData()); |
| this.originalFont = originalFont; |
| } |
| |
| /** |
| * Creates a font descriptor that describes the given font on the |
| * specified device. |
| * |
| * @param originalFont font to be described |
| * @param originalDevice must be the same Device that was passed into |
| * the font's constructor when it was first created. |
| * |
| * @see FontDescriptor#createFrom(org.eclipse.swt.graphics.Font, org.eclipse.swt.graphics.Device) |
| * @since 3.1 |
| */ |
| public ArrayFontDescriptor(Font originalFont, Device originalDevice) { |
| this(originalFont); |
| this.originalDevice = originalDevice; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.FontDescriptor#createFont(org.eclipse.swt.graphics.Device) |
| */ |
| public Font createFont(Device device) { |
| |
| // If this descriptor is an existing font, then we can return the original font |
| // if this is the same device. |
| if (originalFont != null) { |
| |
| // If we don't know what device the original was allocated on, we can't tell if we |
| // can reuse the original until we try to create a new one. |
| if (originalDevice == null) { |
| // Create a new font |
| Font result = new Font(device, data); |
| |
| // If this new font was equal to the original, then it must have been allocated |
| // on the same device. |
| if (result.equals(originalFont)) { |
| // We now know the original device. We can reuse the original font, |
| // discard the temporary Font, and remember the device for the next time |
| // this descriptor is used. |
| result.dispose(); |
| originalDevice = device; |
| return originalFont; |
| } |
| // The newly created font ended up being different from the original, so |
| // it may have been allocated on a different device. Return the new version. |
| return result; |
| } |
| |
| // If we're allocating on the same device as the original font, return the original. |
| if (originalDevice == device) { |
| return originalFont; |
| } |
| } |
| |
| return new Font(device, data); |
| } |
| |
| /* (non-Javadoc) |
| * @see java.lang.Object#equals(java.lang.Object) |
| */ |
| public boolean equals(Object obj) { |
| if ((obj.getClass() == ArrayFontDescriptor.class)) { |
| ArrayFontDescriptor descr = (ArrayFontDescriptor)obj; |
| |
| if (descr.originalFont != originalFont) { |
| return false; |
| } |
| |
| if (originalFont != null) { |
| return true; |
| } |
| |
| if (data.length != descr.data.length) { |
| return false; |
| } |
| |
| for (int i = 0; i < data.length; i++) { |
| FontData fd = data[i]; |
| FontData fd2 = descr.data[i]; |
| |
| if (!fd.equals(fd2)) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* (non-Javadoc) |
| * @see java.lang.Object#hashCode() |
| */ |
| public int hashCode() { |
| if (originalFont != null) { |
| return originalFont.hashCode(); |
| } |
| |
| int code = 0; |
| |
| for (int i = 0; i < data.length; i++) { |
| FontData fd = data[i]; |
| code += fd.hashCode(); |
| } |
| return code; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.FontDescriptor#destroyFont(org.eclipse.swt.graphics.Font) |
| */ |
| public void destroyFont(Font previouslyCreatedFont) { |
| if (previouslyCreatedFont == originalFont) { |
| return; |
| } |
| previouslyCreatedFont.dispose(); |
| } |
| |
| } |