my-jdk/jdkSrc/jdk8/sun/font/TextSourceLabel.java

/*
 * Copyright (c) 1998, 2005, 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.
 */
/*
 *
 * (C) Copyright IBM Corp. 1998, 1999 - All Rights Reserved
 */

package sun.font;

import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;

/**
 * Implementation of TextLabel based on String.
 */

public class TextSourceLabel extends TextLabel {
  TextSource source;

  // caches
  Rectangle2D lb;
  Rectangle2D ab;
  Rectangle2D vb;
  Rectangle2D ib;
  GlyphVector gv;

  public TextSourceLabel(TextSource source) {
    this(source, null, null, null);
  }

  public TextSourceLabel(TextSource source, Rectangle2D lb, Rectangle2D ab, GlyphVector gv) {
    this.source = source;

    this.lb = lb;
    this.ab = ab;
    this.gv = gv;
  }

  public TextSource getSource() {
    return source;
  }

  public final Rectangle2D getLogicalBounds(float x, float y) {
    if (lb == null) {
      lb = createLogicalBounds();
    }
    return new Rectangle2D.Float((float)(lb.getX() + x),
                                 (float)(lb.getY() + y),
                                 (float)lb.getWidth(),
                                 (float)lb.getHeight());
  }

  public final Rectangle2D getVisualBounds(float x, float y) {
    if (vb == null) {
      vb = createVisualBounds();

    }
    return new Rectangle2D.Float((float)(vb.getX() + x),
                                 (float)(vb.getY() + y),
                                 (float)vb.getWidth(),
                                 (float)vb.getHeight());
  }

  public final Rectangle2D getAlignBounds(float x, float y) {
    if (ab == null) {
      ab = createAlignBounds();
    }
    return new Rectangle2D.Float((float)(ab.getX() + x),
                                 (float)(ab.getY() + y),
                                 (float)ab.getWidth(),
                                 (float)ab.getHeight());
  }

  public Rectangle2D getItalicBounds(float x, float y) {
    if (ib == null) {
      ib = createItalicBounds();
    }
    return new Rectangle2D.Float((float)(ib.getX() + x),
                                 (float)(ib.getY() + y),
                                 (float)ib.getWidth(),
                                 (float)ib.getHeight());

  }

  public Rectangle getPixelBounds(FontRenderContext frc, float x, float y) {
      return getGV().getPixelBounds(frc, x, y); // no cache
  }

  public AffineTransform getBaselineTransform() {
      Font font = source.getFont();
      if (font.hasLayoutAttributes()) {
          return AttributeValues.getBaselineTransform(font.getAttributes());
      }
      return null;
  }

  public Shape getOutline(float x, float y) {
    return getGV().getOutline(x, y);
  }

  public void draw(Graphics2D g, float x, float y) {
    g.drawGlyphVector(getGV(), x, y);
  }

  protected Rectangle2D createLogicalBounds() {
    return getGV().getLogicalBounds();
  }

  protected Rectangle2D createVisualBounds() {
    return getGV().getVisualBounds();
  }

  protected Rectangle2D createItalicBounds() {
      // !!! fix
    return getGV().getLogicalBounds();
  }

  protected Rectangle2D createAlignBounds() {
    return createLogicalBounds();
  }

  private final GlyphVector getGV() {
    if (gv == null) {
      gv = createGV();
    }

    return gv;
  }

  protected GlyphVector createGV() {
    Font font = source.getFont();
    FontRenderContext frc = source.getFRC();
    int flags = source.getLayoutFlags();
    char[] context = source.getChars();
    int start = source.getStart();
    int length = source.getLength();

    GlyphLayout gl = GlyphLayout.get(null); // !!! no custom layout engines
    StandardGlyphVector gv = gl.layout(font, frc, context, start, length,
                                       flags, null); // ??? use textsource
    GlyphLayout.done(gl);

    return gv;
  }
}