libjava/classpath/javax/swing/JToolTip.java

   1 /* JToolTip.java --
   2    Copyright (C) 2002, 2004  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 javax.swing;
  40
  41 import java.awt.AWTEvent;
  42 import java.beans.PropertyChangeEvent;
  43
  44 import javax.accessibility.Accessible;
  45 import javax.accessibility.AccessibleContext;
  46 import javax.accessibility.AccessibleRole;
  47 import javax.swing.plaf.ToolTipUI;
  48
  49 /**
  50  * This class is used to display ToolTips. ToolTips are small floating windows
  51  * that display text when the mouse comes to rest over a Component. ToolTips
  52  * are set for JComponents using JComponent.setToolTipText(String).
  53  */
  54 public class JToolTip extends JComponent implements Accessible
  55 {
  56
  57   private static final long serialVersionUID = -1138929898906751643L;
  58
  59   /**
  60    * Provides the accessibility features for the <code>JToolTip</code>
  61    * component.
  62    */
  63   protected class AccessibleJToolTip extends AccessibleJComponent
  64   {
  65     private static final long serialVersionUID = -6222548177795408476L;
  66
  67     /**
  68      * Creates a new AccessibleJToolTip object.
  69      */
  70     protected AccessibleJToolTip()
  71     {
  72       // Nothing to do here.
  73     }
  74
  75     /**
  76      * Returns a description for the accessible component.
  77      *
  78      * @return A description for the accessible component.
  79      */
  80     public String getAccessibleDescription()
  81     {
  82       String result = super.getAccessibleDescription();
  83       if (result == null)
  84         result = text;
  85       return result;
  86     }
  87
  88     /**
  89      * Returns the accessible role for the <code>JToolTip</code> component.
  90      *
  91      * @return {@link AccessibleRole#TOOL_TIP}.
  92      */
  93     public AccessibleRole getAccessibleRole()
  94     {
  95       return AccessibleRole.TOOL_TIP;
  96     }
  97   }
  98
  99   /** The text to display in the JToolTip. */
 100   String text;
 101
 102   /** The component that the tool tip is associated with. */
 103   JComponent component;
 104
 105   /**
 106    * Creates a new <code>JToolTip</code> instance.
 107    */
 108   public JToolTip()
 109   {
 110     disableEvents(AWTEvent.MOUSE_EVENT_MASK);
 111     updateUI();
 112   }
 113
 114   /**
 115    * Returns the text displayed by the tool tip.
 116    *
 117    * @return The text (possibly <code>null</code>).
 118    *
 119    * @see #setTipText(String)
 120    */
 121   public String getTipText()
 122   {
 123     return text;
 124   }
 125
 126   /**
 127    * Returns the object that provides accessibility features for this
 128    * <code>JToolTip</code> component.
 129    *
 130    * @return The accessible context (an instance of {@link AccessibleJToolTip}).
 131    */
 132   public AccessibleContext getAccessibleContext()
 133   {
 134     if (accessibleContext == null)
 135       accessibleContext = new AccessibleJToolTip();
 136     return accessibleContext;
 137   }
 138
 139   /**
 140    * Returns the component that the tool tip is associated with.
 141    *
 142    * @return The component (possibly <code>null</code>).
 143    *
 144    * @see #setComponent(JComponent)
 145    */
 146   public JComponent getComponent()
 147   {
 148     return component;
 149   }
 150
 151   /**
 152    * Returns the current UI delegate for this component.
 153    *
 154    * @return The UI delegate.
 155    */
 156   public ToolTipUI getUI()
 157   {
 158     return (ToolTipUI) ui;
 159   }
 160
 161   /**
 162    * Returns the string suffix used to identify the UI class, in this case
 163    * <code>"ToolTipUI"</code>.
 164    *
 165    * @return <code>"ToolTipUI"</code>.
 166    */
 167   public String getUIClassID()
 168   {
 169     return "ToolTipUI";
 170   }
 171
 172   /**
 173    * Returns a string describing the attributes for the <code>JToolTip</code>
 174    * component, for use in debugging.  The return value is guaranteed to be
 175    * non-<code>null</code>, but the format of the string may vary between
 176    * implementations.
 177    *
 178    * @return A string describing the attributes of the <code>JToolTip</code>.
 179    */
 180   protected String paramString()
 181   {
 182     StringBuffer sb = new StringBuffer(super.paramString());
 183     sb.append(",tiptext=");
 184     if (text != null);
 185       sb.append(text);
 186     return sb.toString();
 187   }
 188
 189   /**
 190    * Sets the component that the tool tip is associated with and sends a
 191    * {@link PropertyChangeEvent} (with the property name 'component') to all
 192    * registered listeners.
 193    *
 194    * @param c  the component (<code>null</code> permitted).
 195    *
 196    * @see #getComponent()
 197    */
 198   public void setComponent(JComponent c)
 199   {
 200     JComponent oldValue = component;
 201     component = c;
 202     firePropertyChange("component", oldValue, c);
 203   }
 204
 205   /**
 206    * Sets the text to be displayed by the tool tip and sends a
 207    * {@link PropertyChangeEvent} (with the property name 'tiptext') to all
 208    * registered listeners.
 209    *
 210    * @param tipText the text (<code>null</code> permitted).
 211    *
 212    * @see #getTipText()
 213    */
 214   public void setTipText(String tipText)
 215   {
 216     String oldValue = text;
 217     text = tipText;
 218     firePropertyChange("tiptext", oldValue, tipText);
 219   }
 220
 221   /**
 222    * This method resets the UI used to the Look and Feel default.
 223    */
 224   public void updateUI()
 225   {
 226     setUI((ToolTipUI) UIManager.getUI(this));
 227   }
 228 }