1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 
  27 package sun.lwawt;
  28 
  29 import java.awt.Dimension;
  30 import java.awt.FontMetrics;
  31 import java.awt.Label;
  32 import java.awt.peer.LabelPeer;
  33 
  34 import javax.swing.JLabel;
  35 import javax.swing.SwingConstants;
  36 
  37 /**
  38  * Lightweight implementation of {@link LabelPeer}. Delegates most of the work
  39  * to the {@link JLabel}.
  40  */
  41 final class LWLabelPeer extends LWComponentPeer<Label, JLabel>
  42         implements LabelPeer {
  43 
  44     private static final int TEXT_XPAD = 5;
  45     private static final int TEXT_YPAD = 1;
  46 
  47     LWLabelPeer(final Label target, final PlatformComponent platformComponent) {
  48         super(target, platformComponent);
  49     }
  50 
  51     @Override
  52     protected JLabel createDelegate() {
  53         final JLabel label = new JLabel();
  54         label.setVerticalAlignment(SwingConstants.TOP);
  55         return label;
  56     }
  57 
  58     @Override
  59     void initializeImpl() {
  60         super.initializeImpl();
  61         setText(getTarget().getText());
  62         setAlignment(getTarget().getAlignment());
  63     }
  64 
  65     @Override
  66     public void setText(final String label) {
  67         synchronized (getDelegateLock()) {
  68             getDelegate().setText(label);
  69         }
  70     }
  71 
  72     @Override
  73     public void setAlignment(final int alignment) {
  74         synchronized (getDelegateLock()) {
  75             getDelegate().setHorizontalAlignment(convertAlignment(alignment));
  76         }
  77     }
  78 
  79     @Override
  80     public Dimension getMinimumSize() {
  81         int w = TEXT_XPAD;
  82         int h = TEXT_YPAD;
  83         final FontMetrics fm = getFontMetrics(getFont());
  84         if (fm != null) {
  85             final String text;
  86             synchronized (getDelegateLock()) {
  87                 text = getDelegate().getText();
  88             }
  89             if (text != null) {
  90                 w += fm.stringWidth(text);
  91             }
  92             h += fm.getHeight();
  93         }
  94         return new Dimension(w, h);
  95     }
  96 
  97     /**
  98      * Converts {@code Label} alignment constant to the {@code JLabel} constant.
  99      * If wrong Label alignment provided returns default alignment.
 100      *
 101      * @param alignment {@code Label} constant.
 102      *
 103      * @return {@code JLabel} constant.
 104      */
 105     private static int convertAlignment(final int alignment) {
 106         switch (alignment) {
 107             case Label.CENTER:
 108                 return SwingConstants.CENTER;
 109             case Label.RIGHT:
 110                 return SwingConstants.RIGHT;
 111             default:
 112                 return SwingConstants.LEFT;
 113         }
 114     }
 115 }