platform/platform-impl/src/com/intellij/ui/HoverHyperlinkLabel.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.ui;
  17
  18 import org.jetbrains.annotations.NonNls;
  19
  20 import javax.swing.*;
  21 import javax.swing.event.HyperlinkEvent;
  22 import javax.swing.event.HyperlinkListener;
  23 import javax.swing.plaf.basic.BasicHTML;
  24 import java.awt.*;
  25 import java.awt.event.MouseAdapter;
  26 import java.awt.event.MouseEvent;
  27 import java.util.ArrayList;
  28
  29 /**
  30  * @author Eugene Belyaev
  31  */
  32 public class HoverHyperlinkLabel extends JLabel {
  33   private String myOriginalText;
  34   private final ArrayList<HyperlinkListener> myListeners = new ArrayList<HyperlinkListener>();
  35
  36   public HoverHyperlinkLabel(String text) {
  37     this(text, Color.BLUE);
  38   }
  39
  40   public HoverHyperlinkLabel(String text, Color color) {
  41     super(text);
  42     myOriginalText = text;
  43     setForeground(color);
  44     setupListener();
  45   }
  46
  47   private void setupListener() {
  48     addMouseListener(new MouseHandler());
  49   }
  50
  51   public void setText(String text) {
  52     if (BasicHTML.isHTMLString(getText())) { // if is currently showing string as html
  53       super.setText(underlineTextInHtml(text));
  54     }
  55     else {
  56       super.setText(text);
  57     }
  58     myOriginalText = text;
  59   }
  60
  61   @NonNls private String underlineTextInHtml(final String text) {
  62     return "<html><u>" + text + "</u></html>";
  63   }
  64
  65   public String getOriginalText() {
  66     return myOriginalText;
  67   }
  68
  69   private class MouseHandler extends MouseAdapter {
  70     public void mouseClicked(MouseEvent e) {
  71       HyperlinkListener[] listeners = myListeners.toArray(new HyperlinkListener[myListeners.size()]);
  72       HyperlinkEvent event = new HyperlinkEvent(HoverHyperlinkLabel.this, HyperlinkEvent.EventType.ACTIVATED, null);
  73       for (int i = 0; i < listeners.length; i++) {
  74         HyperlinkListener listener = listeners[i];
  75         listener.hyperlinkUpdate(event);
  76       }
  77     }
  78
  79     public void mouseEntered(MouseEvent e) {
  80       HoverHyperlinkLabel.super.setText(underlineTextInHtml(myOriginalText));
  81       setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
  82     }
  83
  84     public void mouseExited(MouseEvent e) {
  85       HoverHyperlinkLabel.super.setText(myOriginalText);
  86       setCursor(Cursor.getDefaultCursor());
  87     }
  88   }
  89
  90   public void addHyperlinkListener(HyperlinkListener listener) {
  91     myListeners.add(listener);
  92   }
  93
  94   public void removeHyperlinkListener(HyperlinkListener listener) {
  95     myListeners.remove(listener);
  96   }
  97 }