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 import javax.tools.annotation.GenerateNativeHeader;
  38 
  39 /**
  40  * Lightweight implementation of {@link LabelPeer}. Delegates most of the work
  41  * to the {@link JLabel}.
  42  */
  43 /* No native methods here, but the constants are needed in the supporting JNI code */
  44 @GenerateNativeHeader
  45 final class LWLabelPeer extends LWComponentPeer<Label, JLabel>
  46         implements LabelPeer {
  47 
  48     private static final int TEXT_XPAD = 5;
  49     private static final int TEXT_YPAD = 1;
  50 
  51     LWLabelPeer(final Label target, final PlatformComponent platformComponent) {
  52         super(target, platformComponent);
  53     }
  54 
  55     @Override
  56     protected JLabel createDelegate() {
  57         final JLabel label = new JLabel();
  58         label.setVerticalAlignment(SwingConstants.TOP);
  59         return label;
  60     }
  61 
  62     @Override
  63     void initializeImpl() {
  64         super.initializeImpl();
  65         setText(getTarget().getText());
  66         setAlignment(getTarget().getAlignment());
  67     }
  68 
  69     @Override
  70     public void setText(final String label) {
  71         synchronized (getDelegateLock()) {
  72             getDelegate().setText(label);
  73         }
  74     }
  75 
  76     @Override
  77     public void setAlignment(final int alignment) {
  78         synchronized (getDelegateLock()) {
  79             getDelegate().setHorizontalAlignment(convertAlignment(alignment));
  80         }
  81     }
  82 
  83     @Override
  84     public Dimension getMinimumSize() {
  85         int w = TEXT_XPAD;
  86         int h = TEXT_YPAD;
  87         final FontMetrics fm = getFontMetrics(getFont());
  88         if (fm != null) {
  89             final String text;
  90             synchronized (getDelegateLock()) {
  91                 text = getDelegate().getText();
  92             }
  93             if (text != null) {
  94                 w += fm.stringWidth(text);
  95             }
  96             h += fm.getHeight();
  97         }
  98         return new Dimension(w, h);
  99     }
 100 
 101     /**
 102      * Converts {@code Label} alignment constant to the {@code JLabel} constant.
 103      * If wrong Label alignment provided returns default alignment.
 104      *
 105      * @param alignment {@code Label} constant.
 106      *
 107      * @return {@code JLabel} constant.
 108      */
 109     private static int convertAlignment(final int alignment) {
 110         switch (alignment) {
 111             case Label.CENTER:
 112                 return SwingConstants.CENTER;
 113             case Label.RIGHT:
 114                 return SwingConstants.RIGHT;
 115             default:
 116                 return SwingConstants.LEFT;
 117         }
 118     }
 119 }