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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 import net.sourceforge.phpdt.internal.ui.text.JavaWordFinder;
  14 import net.sourceforge.phpdt.ui.text.java.hover.IJavaEditorTextHover;
  15
  16 import org.eclipse.jface.text.IRegion;
  17 import org.eclipse.jface.text.ITextViewer;
  18 import org.eclipse.jface.text.information.IInformationProvider;
  19 import org.eclipse.ui.IEditorPart;
  20 import org.eclipse.ui.IPartListener;
  21 import org.eclipse.ui.IPerspectiveDescriptor;
  22 import org.eclipse.ui.IWorkbenchPage;
  23 import org.eclipse.ui.IWorkbenchPart;
  24 import org.eclipse.ui.IWorkbenchWindow;
  25
  26 public class JavaInformationProvider implements IInformationProvider {
  27
  28         class EditorWatcher implements IPartListener {
  29
  30                 /**
  31                  * @see IPartListener#partOpened(IWorkbenchPart)
  32                  */
  33                 public void partOpened(IWorkbenchPart part) {
  34                 }
  35
  36                 /**
  37                  * @see IPartListener#partDeactivated(IWorkbenchPart)
  38                  */
  39                 public void partDeactivated(IWorkbenchPart part) {
  40                 }
  41
  42                 /**
  43                  * @see IPartListener#partClosed(IWorkbenchPart)
  44                  */
  45                 public void partClosed(IWorkbenchPart part) {
  46                         if (part == fEditor) {
  47                                 fEditor.getSite().getWorkbenchWindow().getPartService()
  48                                                 .removePartListener(fPartListener);
  49                                 fPartListener = null;
  50                         }
  51                 }
  52
  53                 /**
  54                  * @see IPartListener#partActivated(IWorkbenchPart)
  55                  */
  56                 public void partActivated(IWorkbenchPart part) {
  57                         update();
  58                 }
  59
  60                 public void partBroughtToTop(IWorkbenchPart part) {
  61                         update();
  62                 }
  63         }
  64
  65         protected IEditorPart fEditor;
  66
  67         protected IPartListener fPartListener;
  68
  69         protected String fCurrentPerspective;
  70
  71         protected IJavaEditorTextHover fImplementation;
  72
  73         public JavaInformationProvider(IEditorPart editor) {
  74
  75                 fEditor = editor;
  76
  77                 if (fEditor != null) {
  78
  79                         fPartListener = new EditorWatcher();
  80                         IWorkbenchWindow window = fEditor.getSite().getWorkbenchWindow();
  81                         window.getPartService().addPartListener(fPartListener);
  82
  83                         update();
  84                 }
  85         }
  86
  87         protected void update() {
  88
  89                 IWorkbenchWindow window = fEditor.getSite().getWorkbenchWindow();
  90                 IWorkbenchPage page = window.getActivePage();
  91                 if (page != null) {
  92
  93                         IPerspectiveDescriptor perspective = page.getPerspective();
  94                         if (perspective != null) {
  95                                 String perspectiveId = perspective.getId();
  96
  97                                 if (fCurrentPerspective == null
  98                                                 || fCurrentPerspective != perspectiveId) {
  99                                         fCurrentPerspective = perspectiveId;
 100
 101                                         fImplementation = new JavaTypeHover();
 102                                         fImplementation.setEditor(fEditor);
 103                                 }
 104                         }
 105                 }
 106         }
 107
 108         /*
 109          * @see IInformationProvider#getSubject(ITextViewer, int)
 110          */
 111         public IRegion getSubject(ITextViewer textViewer, int offset) {
 112
 113                 if (textViewer != null)
 114                         return JavaWordFinder.findWord(textViewer.getDocument(), offset);
 115
 116                 return null;
 117         }
 118
 119         /*
 120          * @see IInformationProvider#getInformation(ITextViewer, IRegion)
 121          */
 122         public String getInformation(ITextViewer textViewer, IRegion subject) {
 123                 if (fImplementation != null) {
 124                         String s = fImplementation.getHoverInfo(textViewer, subject);
 125                         if (s != null && s.trim().length() > 0)
 126                                 return s;
 127                 }
 128
 129                 return null;
 130         }
 131 }