net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/java/hover/JavaInformationProvider.java

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