JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1996, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.beans.editors;

import java.awt.*;
import java.beans.*;

public class FontEditor extends Panel implements java.beans.PropertyEditor {
    private static final long serialVersionUID = 6732704486002715933L;

    public FontEditor() {
        setLayout(null);

        toolkit = Toolkit.getDefaultToolkit();
        fonts = toolkit.getFontList();

        familyChoser = new Choice();
        for (int i = 0; i < fonts.length; i++) {
            familyChoser.addItem(fonts[i]);
        }
        add(familyChoser);
        familyChoser.reshape(20, 5, 100, 30);

        styleChoser = new Choice();
        for (int i = 0; i < styleNames.length; i++) {
            styleChoser.addItem(styleNames[i]);
        }
        add(styleChoser);
        styleChoser.reshape(145, 5, 70, 30);

        sizeChoser = new Choice();
        for (int i = 0; i < pointSizes.length; i++) {
            sizeChoser.addItem("" + pointSizes[i]);
        }
        add(sizeChoser);
        sizeChoser.reshape(220, 5, 70, 30);

        resize(300,40);
    }


    public Dimension preferredSize() {
        return new Dimension(300, 40);
    }

    public void setValue(Object o) {
        font = (Font) o;
        if (this.font == null)
            return;

        changeFont(font);
        // Update the current GUI choices.
        for (int i = 0; i < fonts.length; i++) {
            if (fonts[i].equals(font.getFamily())) {
                familyChoser.select(i);
                break;
            }
        }
        for (int i = 0; i < styleNames.length; i++) {
            if (font.getStyle() == styles[i]) {
                styleChoser.select(i);
                break;
            }
        }
        for (int i = 0; i < pointSizes.length; i++) {
            if (font.getSize() <= pointSizes[i]) {
                sizeChoser.select(i);
                break;
            }
        }
    }

    private void changeFont(Font f) {
        font = f;
        if (sample != null) {
            remove(sample);
        }
        sample = new Label(sampleText);
        sample.setFont(font);
        add(sample);
        Component p = getParent();
        if (p != null) {
            p.invalidate();
            p.layout();
        }
        invalidate();
        layout();
        repaint();
        support.firePropertyChange("", null, null);
    }

    public Object getValue() {
        return (font);
    }

    public String getJavaInitializationString() {
        if (this.font == null)
            return "null";

        return "new java.awt.Font(\"" + font.getName() + "\", " +
                   font.getStyle() + ", " + font.getSize() + ")";
    }

    public boolean action(Event e, Object arg) {
        String family = familyChoser.getSelectedItem();
        int style = styles[styleChoser.getSelectedIndex()];
        int size = pointSizes[sizeChoser.getSelectedIndex()];
        try {
            Font f = new Font(family, style, size);
            changeFont(f);
        } catch (Exception ex) {
            System.err.println("Couldn't create font " + family + "-" +
                        styleNames[style] + "-" + size);
        }
        return (false);
    }


    public boolean isPaintable() {
        return true;
    }

    public void paintValue(java.awt.Graphics gfx, java.awt.Rectangle box) {
        // Silent noop.
        Font oldFont = gfx.getFont();
        gfx.setFont(font);
        FontMetrics fm = gfx.getFontMetrics();
        int vpad = (box.height - fm.getAscent())/2;
        gfx.drawString(sampleText, 0, box.height-vpad);
        gfx.setFont(oldFont);
    }

    public String getAsText() {
        if (this.font == null) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        sb.append(this.font.getName());
        sb.append(' ');

        boolean b = this.font.isBold();
        if (b) {
            sb.append("BOLD");
        }
        boolean i = this.font.isItalic();
        if (i) {
            sb.append("ITALIC");
        }
        if (b || i) {
            sb.append(' ');
        }
        sb.append(this.font.getSize());
        return sb.toString();
    }

    public void setAsText(String text) throws IllegalArgumentException {
        setValue((text == null) ? null : Font.decode(text));
    }

    public String[] getTags() {
        return null;
    }

    public java.awt.Component getCustomEditor() {
        return this;
    }

    public boolean supportsCustomEditor() {
        return true;
    }

    public void addPropertyChangeListener(PropertyChangeListener l) {
        support.addPropertyChangeListener(l);
    }


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