1/* 2 * Copyright (c) 2002, 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 26package javax.swing.plaf.synth; 27 28import javax.swing.*; 29import javax.swing.plaf.*; 30import javax.swing.plaf.basic.BasicPanelUI; 31import java.awt.*; 32import java.beans.*; 33 34/** 35 * Provides the Synth L&F UI delegate for 36 * {@link javax.swing.JPanel}. 37 * 38 * @author Steve Wilson 39 * @since 1.7 40 */ 41public class SynthPanelUI extends BasicPanelUI 42 implements PropertyChangeListener, SynthUI { 43 private SynthStyle style; 44 45 /** 46 * Creates a new UI object for the given component. 47 * 48 * @param c component to create UI object for 49 * @return the UI object 50 */ 51 public static ComponentUI createUI(JComponent c) { 52 return new SynthPanelUI(); 53 } 54 55 /** 56 * {@inheritDoc} 57 */ 58 @Override 59 public void installUI(JComponent c) { 60 JPanel p = (JPanel)c; 61 62 super.installUI(c); 63 installListeners(p); 64 } 65 66 /** 67 * {@inheritDoc} 68 */ 69 @Override 70 public void uninstallUI(JComponent c) { 71 JPanel p = (JPanel)c; 72 73 uninstallListeners(p); 74 super.uninstallUI(c); 75 } 76 77 /** 78 * Installs listeners into the panel. 79 * 80 * @param p the {@code JPanel} object 81 */ 82 protected void installListeners(JPanel p) { 83 p.addPropertyChangeListener(this); 84 } 85 86 /** 87 * Uninstalls listeners from the panel. 88 * 89 * @param p the {@code JPanel} object 90 */ 91 protected void uninstallListeners(JPanel p) { 92 p.removePropertyChangeListener(this); 93 } 94 95 /** 96 * {@inheritDoc} 97 */ 98 @Override 99 protected void installDefaults(JPanel p) { 100 updateStyle(p); 101 } 102 103 /** 104 * {@inheritDoc} 105 */ 106 @Override 107 protected void uninstallDefaults(JPanel p) { 108 SynthContext context = getContext(p, ENABLED); 109 110 style.uninstallDefaults(context); 111 style = null; 112 } 113 114 private void updateStyle(JPanel c) { 115 SynthContext context = getContext(c, ENABLED); 116 style = SynthLookAndFeel.updateStyle(context, this); 117 } 118 119 /** 120 * {@inheritDoc} 121 */ 122 @Override 123 public SynthContext getContext(JComponent c) { 124 return getContext(c, getComponentState(c)); 125 } 126 127 private SynthContext getContext(JComponent c, int state) { 128 return SynthContext.getContext(c, style, state); 129 } 130 131 private int getComponentState(JComponent c) { 132 return SynthLookAndFeel.getComponentState(c); 133 } 134 135 /** 136 * Notifies this UI delegate to repaint the specified component. 137 * This method paints the component background, then calls 138 * the {@link #paint(SynthContext,Graphics)} method. 139 * 140 * <p>In general, this method does not need to be overridden by subclasses. 141 * All Look and Feel rendering code should reside in the {@code paint} method. 142 * 143 * @param g the {@code Graphics} object used for painting 144 * @param c the component being painted 145 * @see #paint(SynthContext,Graphics) 146 */ 147 @Override 148 public void update(Graphics g, JComponent c) { 149 SynthContext context = getContext(c); 150 151 SynthLookAndFeel.update(context, g); 152 context.getPainter().paintPanelBackground(context, 153 g, 0, 0, c.getWidth(), c.getHeight()); 154 paint(context, g); 155 } 156 157 /** 158 * Paints the specified component according to the Look and Feel. 159 * <p>This method is not used by Synth Look and Feel. 160 * Painting is handled by the {@link #paint(SynthContext,Graphics)} method. 161 * 162 * @param g the {@code Graphics} object used for painting 163 * @param c the component being painted 164 * @see #paint(SynthContext,Graphics) 165 */ 166 @Override 167 public void paint(Graphics g, JComponent c) { 168 SynthContext context = getContext(c); 169 170 paint(context, g); 171 } 172 173 /** 174 * Paints the specified component. This implementation does nothing. 175 * 176 * @param context context for the component being painted 177 * @param g the {@code Graphics} object used for painting 178 * @see #update(Graphics,JComponent) 179 */ 180 protected void paint(SynthContext context, Graphics g) { 181 // do actual painting 182 } 183 184 /** 185 * {@inheritDoc} 186 */ 187 @Override 188 public void paintBorder(SynthContext context, Graphics g, int x, 189 int y, int w, int h) { 190 context.getPainter().paintPanelBorder(context, g, x, y, w, h); 191 } 192 193 /** 194 * {@inheritDoc} 195 */ 196 @Override 197 public void propertyChange(PropertyChangeEvent pce) { 198 if (SynthLookAndFeel.shouldUpdateStyle(pce)) { 199 updateStyle((JPanel)pce.getSource()); 200 } 201 } 202} 203