1 /* 2 * Copyright (c) 2011, 2013, 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.Adjustable; 30 import java.awt.Scrollbar; 31 import java.awt.event.AdjustmentEvent; 32 import java.awt.event.AdjustmentListener; 33 import java.awt.peer.ScrollbarPeer; 34 35 import javax.swing.JScrollBar; 36 37 final class LWScrollBarPeer extends LWComponentPeer<Scrollbar, JScrollBar> 38 implements ScrollbarPeer, AdjustmentListener { 39 40 //JScrollBar fires two changes with firePropertyChange (one for old value 41 // and one for new one. 42 // We save the last value and don't fire event if not changed. 43 private int currentValue; 44 45 LWScrollBarPeer(final Scrollbar target, 46 final PlatformComponent platformComponent) { 47 super(target, platformComponent); 48 } 49 50 @Override 51 protected JScrollBar createDelegate() { 52 return new JScrollBar(); 53 } 54 55 @Override 56 void initializeImpl() { 57 super.initializeImpl(); 58 final Scrollbar target = getTarget(); 59 setLineIncrement(target.getUnitIncrement()); 60 setPageIncrement(target.getBlockIncrement()); 61 setValues(target.getValue(), target.getVisibleAmount(), 62 target.getMinimum(), target.getMaximum()); 63 64 final int orientation = target.getOrientation(); 65 final JScrollBar delegate = getDelegate(); 66 synchronized (getDelegateLock()) { 67 delegate.setOrientation(orientation == Scrollbar.HORIZONTAL 68 ? Adjustable.HORIZONTAL 69 : Adjustable.VERTICAL); 70 delegate.addAdjustmentListener(this); 71 } 72 } 73 74 @Override 75 public void setValues(final int value, final int visible, final int minimum, 76 final int maximum) { 77 synchronized (getDelegateLock()) { 78 currentValue = value; 79 getDelegate().setValues(value, visible, minimum, maximum); 80 } 81 } 82 83 @Override 84 public void setLineIncrement(final int l) { 85 synchronized (getDelegateLock()) { 86 getDelegate().setUnitIncrement(l); 87 } 88 } 89 90 @Override 91 public void setPageIncrement(final int l) { 92 synchronized (getDelegateLock()) { 93 getDelegate().setBlockIncrement(l); 94 } 95 } 96 97 // Peer also registered as a listener for ComponentDelegate component 98 @Override 99 public void adjustmentValueChanged(final AdjustmentEvent e) { 100 final int value = e.getValue(); 101 synchronized (getDelegateLock()) { 102 if (currentValue == value) { 103 return; 104 } 105 currentValue = value; 106 } 107 getTarget().setValueIsAdjusting(e.getValueIsAdjusting()); 108 getTarget().setValue(value); 109 postEvent(new AdjustmentEvent(getTarget(), e.getID(), 110 e.getAdjustmentType(), value, 111 e.getValueIsAdjusting())); 112 } 113 }