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 }