1 /* ScrollPaneAdjustable.java -- Scrollbars for a ScrollPane 2 Copyright (C) 1999 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package java.awt; 40 41 import java.awt.event.AdjustmentListener; 42 import java.io.Serializable; 43 44 /** 45 * Need this class since the serialization spec for ScrollPane 46 * uses it. 47 * 48 * @author Aaron M. Renn (arenn@urbanophile.com) 49 * @since 1.4 50 */ 51 public class ScrollPaneAdjustable 52 implements Adjustable, Serializable 53 { 54 private static final long serialVersionUID = -3359745691033257079L; 55 56 ScrollPane sp; 57 int orientation; 58 int value; 59 int minimum; 60 int maximum; 61 int visibleAmount; 62 int unitIncrement = 1; 63 int blockIncrement = 1; 64 AdjustmentListener adjustmentListener; 65 66 private transient boolean valueIsAdjusting = false; 67 ScrollPaneAdjustable(ScrollPane sp, int orientation)68 ScrollPaneAdjustable (ScrollPane sp, int orientation) 69 { 70 this.sp = sp; 71 this.orientation = orientation; 72 } 73 ScrollPaneAdjustable(ScrollPane sp, int orientation, int value, int minimum, int maximum, int visibleAmount, int unitIncrement, int blockIncrement)74 ScrollPaneAdjustable (ScrollPane sp, int orientation, int value, int minimum, 75 int maximum, int visibleAmount, int unitIncrement, 76 int blockIncrement) 77 { 78 this.sp = sp; 79 this.orientation = orientation; 80 this.value = value; 81 this.minimum = minimum; 82 this.maximum = maximum; 83 this.visibleAmount = visibleAmount; 84 this.unitIncrement = unitIncrement; 85 this.blockIncrement = blockIncrement; 86 } 87 addAdjustmentListener(AdjustmentListener listener)88 public void addAdjustmentListener (AdjustmentListener listener) 89 { 90 if (listener == null) 91 return; 92 adjustmentListener = AWTEventMulticaster.add (adjustmentListener, listener); 93 } 94 removeAdjustmentListener(AdjustmentListener listener)95 public void removeAdjustmentListener (AdjustmentListener listener) 96 { 97 if (listener == null) 98 return; 99 adjustmentListener = AWTEventMulticaster.remove (adjustmentListener, listener); 100 } 101 getAdjustmentListeners()102 public AdjustmentListener[] getAdjustmentListeners () 103 { 104 return (AdjustmentListener[]) AWTEventMulticaster.getListeners 105 (adjustmentListener, AdjustmentListener.class); 106 } 107 getBlockIncrement()108 public int getBlockIncrement () 109 { 110 return blockIncrement; 111 } 112 getMaximum()113 public int getMaximum () 114 { 115 return maximum; 116 } 117 getMinimum()118 public int getMinimum () 119 { 120 return minimum; 121 } 122 getOrientation()123 public int getOrientation () 124 { 125 return orientation; 126 } 127 getUnitIncrement()128 public int getUnitIncrement () 129 { 130 return unitIncrement; 131 } 132 getValue()133 public int getValue () 134 { 135 return value; 136 } 137 getVisibleAmount()138 public int getVisibleAmount () 139 { 140 return visibleAmount; 141 } 142 setBlockIncrement(int blockIncrement)143 public void setBlockIncrement (int blockIncrement) 144 { 145 this.blockIncrement = blockIncrement; 146 } 147 148 /** 149 * This method should never be called. 150 * 151 * @param maximum The maximum value to be set. 152 * @throws AWTError Always throws this error when called. 153 */ setMaximum(int maximum)154 public void setMaximum (int maximum) throws AWTError 155 { 156 throw new AWTError("Can be set by scrollpane only"); 157 } 158 159 /** 160 * This method should never be called. 161 * 162 * @param minimum The minimum value to be set. 163 * @throws AWTError Always throws this error when called. 164 */ setMinimum(int minimum)165 public void setMinimum (int minimum) 166 { 167 throw new AWTError("Can be set by scrollpane only"); 168 } 169 setUnitIncrement(int unitIncrement)170 public void setUnitIncrement (int unitIncrement) 171 { 172 this.unitIncrement = unitIncrement; 173 } 174 setValue(int value)175 public void setValue (int value) 176 { 177 this.value = value; 178 179 if (value < minimum) 180 minimum = value; 181 182 if (value > maximum) 183 maximum = value; 184 } 185 186 /** 187 * This method should never be called. 188 * 189 * @param visibleAmount The visible amount to be set. 190 * @throws AWTError Always throws this error when called. 191 */ setVisibleAmount(int visibleAmount)192 public void setVisibleAmount (int visibleAmount) 193 { 194 throw new AWTError("Can be set by scrollpane only"); 195 } 196 paramString()197 public String paramString () 198 { 199 return paramStringHelper() 200 + ",[" + getMinimum() + ".." + getMaximum() 201 + "],val=" + getValue() 202 + ",vis=" + getVisibleAmount() 203 + ",unit=" + getUnitIncrement() 204 + ",block=" + getBlockIncrement() 205 + ",isAdjusting=" + valueIsAdjusting; 206 } 207 paramStringHelper()208 private String paramStringHelper() 209 { 210 if (getOrientation() == HORIZONTAL) 211 return "horizontal"; 212 else 213 return "vertical"; 214 } 215 toString()216 public String toString() 217 { 218 return getClass().getName() + "[" + paramString() + "]"; 219 } 220 221 /** 222 * Returns true if the value is in the process of changing. 223 * 224 * @since 1.4 225 */ getValueIsAdjusting()226 public boolean getValueIsAdjusting () 227 { 228 return valueIsAdjusting; 229 } 230 231 /** 232 * Sets the value of valueIsAdjusting. 233 * 234 * @since 1.4 235 */ setValueIsAdjusting(boolean valueIsAdjusting)236 public void setValueIsAdjusting (boolean valueIsAdjusting) 237 { 238 this.valueIsAdjusting = valueIsAdjusting; 239 } 240 241 } // class ScrollPaneAdjustable 242