Examples of org.eclipse.jface.text.ITextViewer

org.eclipse.jface.text.ITextViewer
A text viewer connects a text widget with an {@link org.eclipse.jface.text.IDocument}. The document is used as the widget's text model.
It supports the following kinds of listeners:
- view port listeners to inform about changes of the viewer's view port
- text listeners to inform about changes of the document and the subsequent viewer change
- text input listeners to inform about changes of the viewer's input document.
A text viewer supports a set of configuration options and plug-ins defining its behavior:
- undo manager
- double click behavior
- auto indentation
- text hover
Installed plug-ins are not automatically activated. Plug-ins must be activated with the activatePlugins call. Most plug-ins can be defined per content type. Content types are derived from a partitioning of the text viewer's input document. In case of documents that support multiple partitionings, the implementer is responsible for determining the partitioning to use.
A text viewer also provides the concept of event consumption. Events handled by the viewer can be filtered and processed by a dynamic event consumer. With {@link org.eclipse.jface.text.ITextViewerExtension}, this mechanism has been replaced with the support for {@link org.eclipse.swt.custom.VerifyKeyListener}.
A text viewer provides several text editing functions, some of them are configurable, through a text operation target interface. It also supports a presentation mode in which it only shows a specified section of its document. By calling setVisibleRegion clients define which section is visible. Clients can get access to this section by calling getVisibleRegion. The viewer's presentation mode does not affect any client of the viewer other than text listeners. With {@link org.eclipse.jface.text.ITextViewerExtension5} the visible regionsupport has been reworked. With that extension interface, text viewers are allowed to show fractions of their input document. I.e. a widget selection of two visually neighboring characters is no longer guaranteed to be two neighboring characters in the viewer's input document. Thus, viewers implementing {@link org.eclipse.jface.text.ITextViewerExtension5} arepotentially forced to change the fractions of the input document that are shown when clients ask for the visible region.
In order to provide backward compatibility for clients of ITextViewer, extension interfaces are used as a means of evolution. The following extension interfaces exist:
- {@link org.eclipse.jface.text.ITextViewerExtension} since version 2.0replacing the event consumer mechanism and introducing the concept of rewrite targets and means to manage the viewer's redraw behavior
- {@link org.eclipse.jface.text.ITextViewerExtension2}since version 2.1 adding a way to invalidate a viewer's presentation and setters for hovers.
- {@link org.eclipse.jface.text.ITextViewerExtension3} since version 2.1which itself was replaced by {@link org.eclipse.jface.text.ITextViewerExtension5} in version 3.0
- {@link org.eclipse.jface.text.ITextViewerExtension4} since version 3.0introducing focus handling for widget token keepers and the concept of text presentation listeners.
- {@link org.eclipse.jface.text.ITextViewerExtension5} since version 3.0extending the visible region concept with explicit handling and conversion of widget and model coordinates.
- {@link org.eclipse.jface.text.ITextViewerExtension6} since version 3.1extending the text viewer with the ability to detect hyperlinks and access the undo manager.
- {@link org.eclipse.jface.text.ITextViewerExtension7} since version 3.3extending the text viewer with the ability to install tabs to spaces conversion.
- {@link org.eclipse.jface.text.ITextViewerExtension8} since version 3.4extending the text viewer with the ability to print and rich hover support.
Clients may implement this interface and its extension interfaces or use the standard implementation {@link org.eclipse.jface.text.TextViewer}.
@see org.eclipse.jface.text.ITextViewerExtension @see org.eclipse.jface.text.ITextViewerExtension2 @see org.eclipse.jface.text.ITextViewerExtension3 @see org.eclipse.jface.text.ITextViewerExtension4 @see org.eclipse.jface.text.ITextViewerExtension5 @see org.eclipse.jface.text.ITextViewerExtension6 @see org.eclipse.jface.text.ITextViewerExtension7 @see org.eclipse.jface.text.ITextViewerExtension8 @see org.eclipse.jface.text.IDocument @see org.eclipse.jface.text.ITextInputListener @see org.eclipse.jface.text.IViewportListener @see org.eclipse.jface.text.ITextListener @see org.eclipse.jface.text.IEventConsumer

    throws Exception
  {
    IContentAssistProcessor processor =
      getContentAssistProcessor(commandLine, project, file);


    ITextViewer viewer = getTextViewer(commandLine, project, file);


    if (processor != null && viewer != null){
      return processor.computeCompletionProposals(viewer, offset);
    }
    return new ICompletionProposal[0];

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      /**
       * Installs the painter on the viewer.
       */
      private void installPainter() {
        Assert.isTrue(whitespaceCharPainter == null);
        ITextViewer v = getTextViewer();
        if (v instanceof ITextViewerExtension2) {
          IPreferenceStore store = getStore();
          whitespaceCharPainter = new WhitespaceCharacterPainter(
              v,
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_LEADING_SPACES),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_ENCLOSED_SPACES),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_TRAILING_SPACES),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_LEADING_IDEOGRAPHIC_SPACES),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_ENCLOSED_IDEOGRAPHIC_SPACES),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_TRAILING_IDEOGRAPHIC_SPACES),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_LEADING_TABS),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_ENCLOSED_TABS),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_TRAILING_TABS),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_CARRIAGE_RETURN),
              store.getBoolean(AbstractTextEditor.PREFERENCE_SHOW_LINE_FEED),
              store.getInt(AbstractTextEditor.PREFERENCE_WHITESPACE_CHARACTER_ALPHA_VALUE));
          ((ITextViewerExtension2) v).addPainter(whitespaceCharPainter);
        }
      }


      /**
       * Remove the painter from the viewer.
       */
      private void uninstallPainter() {
        if (whitespaceCharPainter == null)
          return;
        ITextViewer v = getTextViewer();
        if (v instanceof ITextViewerExtension2)
          ((ITextViewerExtension2) v)
              .removePainter(whitespaceCharPainter);
        whitespaceCharPainter.deactivate(true);
        whitespaceCharPainter = null;

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      // default behavior: any document change outside a linked position
      // causes us to exit
      int end= event.getOffset() + event.getLength();
      for (int offset= event.getOffset(); offset <= end; offset++) {
        if (!fModel.anyPositionContains(offset)) {
          ITextViewer viewer= fCurrentTarget.getViewer();
          if (fFramePosition != null && viewer instanceof IEditingSupportRegistry) {
            IEditingSupport[] helpers= ((IEditingSupportRegistry) viewer).getRegisteredSupports();
            for (int i= 0; i < helpers.length; i++) {
              if (helpers[i].isOriginator(null, new Region(fFramePosition.getOffset(), fFramePosition.getLength())))
                return;

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  }


  private void ensureAnnotationModelInstalled() {
    LinkedPositionAnnotations lpa= fCurrentTarget.fAnnotationModel;
    if (lpa != null) {
      ITextViewer viewer= fCurrentTarget.getViewer();
      if (viewer instanceof ISourceViewer) {
        ISourceViewer sv= (ISourceViewer) viewer;
        IAnnotationModel model= sv.getAnnotationModel();
        if (model instanceof IAnnotationModelExtension) {
          IAnnotationModelExtension ext= (IAnnotationModelExtension) model;

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      }
    }
  }


  private void uninstallAnnotationModel(LinkedModeUITarget target) {
    ITextViewer viewer= target.getViewer();
    if (viewer instanceof ISourceViewer) {
      ISourceViewer sv= (ISourceViewer) viewer;
      IAnnotationModel model= sv.getAnnotationModel();
      if (model instanceof IAnnotationModelExtension) {
        IAnnotationModelExtension ext= (IAnnotationModelExtension) model;

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      }
    }
  }


  private void select() {
    ITextViewer viewer= fCurrentTarget.getViewer();
    if (viewer instanceof ITextViewerExtension5) {
      ITextViewerExtension5 extension5= (ITextViewerExtension5) viewer;
      extension5.exposeModelRange(new Region(fFramePosition.offset, fFramePosition.length));
    } else if (!viewer.overlapsWithVisibleRegion(fFramePosition.offset, fFramePosition.length)) {
      viewer.resetVisibleRegion();
    }
    viewer.revealRange(fFramePosition.offset, fFramePosition.length);
    viewer.setSelectedRange(fFramePosition.offset, fFramePosition.length);
  }

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      fCurrentTarget.fAnnotationModel.switchToPosition(fModel, fFramePosition);
  }


  private void connect() {
    Assert.isNotNull(fCurrentTarget);
    ITextViewer viewer= fCurrentTarget.getViewer();
    Assert.isNotNull(viewer);
    fCurrentTarget.fWidget= viewer.getTextWidget();
    if (fCurrentTarget.fWidget == null)
      leave(ILinkedModeListener.EXIT_ALL);


    if (fCurrentTarget.fKeyListener == null) {
      fCurrentTarget.fKeyListener= new KeyListener();
      ((ITextViewerExtension) viewer).prependVerifyKeyListener(fCurrentTarget.fKeyListener);
    } else
      fCurrentTarget.fKeyListener.setEnabled(true);


    registerAutoEditVetoer(viewer);


    ((IPostSelectionProvider) viewer).addPostSelectionChangedListener(fSelectionListener);


    createAnnotationModel();


    showSelection();


    fCurrentTarget.fShell= fCurrentTarget.fWidget.getShell();
    if (fCurrentTarget.fShell == null)
      leave(ILinkedModeListener.EXIT_ALL);
    fCurrentTarget.fShell.addShellListener(fCloser);


    fAssistant.install(viewer);


    viewer.addTextInputListener(fCloser);


    viewer.getDocument().addDocumentListener(fDocumentListener);
  }

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    return "linked.annotationmodelkey."+toString(); //$NON-NLS-1$
  }


  private void disconnect() {
    Assert.isNotNull(fCurrentTarget);
    ITextViewer viewer= fCurrentTarget.getViewer();
    Assert.isNotNull(viewer);


    viewer.getDocument().removeDocumentListener(fDocumentListener);


    fAssistant.uninstall();
    fAssistant.removeProposalListener(fProposalListener);


    fCurrentTarget.fWidget= null;

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      fCurrentTarget.fAnnotationModel.removeAllAnnotations();
    disconnect();


    for (int i= 0; i < fTargets.length; i++) {
      LinkedModeUITarget target= fTargets[i];
      ITextViewer viewer= target.getViewer();
      if (target.fKeyListener != null) {
        ((ITextViewerExtension) viewer).removeVerifyKeyListener(target.fKeyListener);
        target.fKeyListener= null;
      }


      viewer.removeTextInputListener(fCloser);
    }


    for (int i= 0; i < fTargets.length; i++) {


      if (fTargets[i].fAnnotationModel != null) {

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      // Better:
      // Check with content assistant and only leave if its not the proposal shell that took the
      // focus away.


      StyledText text;
      final ITextViewer viewer;
      Display display;


      if (fCurrentTarget == null || (text= fCurrentTarget.fWidget) == null
          || text.isDisposed() || (display= text.getDisplay()) == null
          || display.isDisposed()

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