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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.text.java.hover;
  12
  13
  14 import org.eclipse.jface.text.IRegion;
  15 import org.eclipse.jface.text.ITextViewer;
  16 import org.eclipse.jface.text.information.IInformationProvider;
  17
  18 import org.eclipse.ui.IEditorPart;
  19 import org.eclipse.ui.IPartListener;
  20 import org.eclipse.ui.IPerspectiveDescriptor;
  21 import org.eclipse.ui.IWorkbenchPage;
  22 import org.eclipse.ui.IWorkbenchPart;
  23 import org.eclipse.ui.IWorkbenchWindow;
  24
  25 import net.sourceforge.phpdt.ui.text.java.hover.IJavaEditorTextHover;
  26
  27 import net.sourceforge.phpdt.internal.ui.text.JavaWordFinder;
  28
  29
  30 public class JavaInformationProvider implements IInformationProvider {
  31
  32         class EditorWatcher implements IPartListener {
  33
  34                 /**
  35                  * @see IPartListener#partOpened(IWorkbenchPart)
  36                  */
  37                 public void partOpened(IWorkbenchPart part) {
  38                 }
  39
  40                 /**
  41                  * @see IPartListener#partDeactivated(IWorkbenchPart)
  42                  */
  43                 public void partDeactivated(IWorkbenchPart part) {
  44                 }
  45
  46                 /**
  47                  * @see IPartListener#partClosed(IWorkbenchPart)
  48                  */
  49                 public void partClosed(IWorkbenchPart part) {
  50                         if (part == fEditor) {
  51                                 fEditor.getSite().getWorkbenchWindow().getPartService().removePartListener(fPartListener);
  52                                 fPartListener= null;
  53                         }
  54                 }
  55
  56                 /**
  57                  * @see IPartListener#partActivated(IWorkbenchPart)
  58                  */
  59                 public void partActivated(IWorkbenchPart part) {
  60                         update();
  61                 }
  62
  63                 public void partBroughtToTop(IWorkbenchPart part) {
  64                         update();
  65                 }
  66         }
  67
  68         protected IEditorPart fEditor;
  69         protected IPartListener fPartListener;
  70
  71         protected String fCurrentPerspective;
  72         protected IJavaEditorTextHover fImplementation;
  73
  74
  75         public JavaInformationProvider(IEditorPart editor) {
  76
  77                 fEditor= editor;
  78
  79                 if (fEditor != null) {
  80
  81                         fPartListener= new EditorWatcher();
  82                         IWorkbenchWindow window= fEditor.getSite().getWorkbenchWindow();
  83                         window.getPartService().addPartListener(fPartListener);
  84
  85                         update();
  86                 }
  87         }
  88
  89         protected void update() {
  90
  91                 IWorkbenchWindow window= fEditor.getSite().getWorkbenchWindow();
  92                 IWorkbenchPage page= window.getActivePage();
  93                 if (page != null) {
  94
  95                         IPerspectiveDescriptor perspective= page.getPerspective();
  96                         if (perspective != null)  {
  97                                 String perspectiveId= perspective.getId();
  98
  99                                 if (fCurrentPerspective == null || fCurrentPerspective != perspectiveId) {
 100                                         fCurrentPerspective= perspectiveId;
 101
 102                                         fImplementation= new JavaTypeHover();
 103                                         fImplementation.setEditor(fEditor);
 104                                 }
 105                         }
 106                 }
 107         }
 108
 109         /*
 110          * @see IInformationProvider#getSubject(ITextViewer, int)
 111          */
 112         public IRegion getSubject(ITextViewer textViewer, int offset) {
 113
 114                 if (textViewer != null)
 115                         return JavaWordFinder.findWord(textViewer.getDocument(), offset);
 116
 117                 return null;
 118         }
 119
 120         /*
 121          * @see IInformationProvider#getInformation(ITextViewer, IRegion)
 122          */
 123         public String getInformation(ITextViewer textViewer, IRegion subject) {
 124                 if (fImplementation != null) {
 125                         String s= fImplementation.getHoverInfo(textViewer, subject);
 126                         if (s != null && s.trim().length() > 0)
 127                                 return s;
 128                 }
 129
 130                 return null;
 131         }
 132 }