fontprovider.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 56 行

/*
 * $Id: FontProvider.java,v 1.1 2003/11/25 11:51:41 epr Exp $
 */
package org.jnode.awt.font;

import java.awt.Font;
import java.awt.FontMetrics;
import java.util.Set;

/**
 * @author Ewout Prangsma ([e-mail])
 */
public interface FontProvider {

	/**
	 * Does this provides provide the given font?
	 * @param font
	 * @return True if this provider provides the given font, false otherwise
	 */
	public boolean provides(Font font);

	/**
	 * Returns a set containing a one-point size instance of all fonts 
	 * available in this provider. 
	 * Typical usage would be to allow a user to select a particular font. 
	 * Then, the application can size the font and set various font 
	 * attributes by calling the deriveFont method on the choosen instance.
	 * This method provides for the application the most precise control 
	 * over which Font instance is used to render text.
	 * If a font in this provider has multiple programmable variations,
	 * only one instance of that Font is returned in the set, 
	 * and other variations must be derived by the application.
	 * If a font in this provider has multiple programmable variations, 
	 * such as Multiple-Master fonts, only one instance of that font 
	 * is returned in the Font set. 
	 * The other variations must be derived by the application. 
	 * 
	 * @return All fonts this provider can provide
	 */
	public Set getAllFonts();

	/**
	 * Gets a text renderer for the given font.
	 * @param font
	 * @return The text renderen for the given font
	 */
	public TextRenderer getTextRenderer(Font font);

	/**
	 * Gets the font metrics for the given font.
	 * @param font
	 * @return The font metrics for the given font
	 */
	public FontMetrics getFontMetrics(Font font);
}