Examples of org.eclipse.jface.text.ITextViewerExtension

org.eclipse.jface.text.ITextViewerExtension
Extension interface for {@link org.eclipse.jface.text.ITextViewer}.
This extension interface replaces the event consumer mechanism ( {@link org.eclipse.jface.text.ITextViewer#setEventConsumer(IEventConsumer)}) with a set of methods that allow to manage a sequence of {@link org.eclipse.swt.custom.VerifyKeyListener}objects. It also adds
- access to the control of this viewer
- marked region support as in emacs
- control of the viewer's redraw behavior by introducing setRedraw(boolean)
- access to the viewer's rewrite target.
A rewrite target ( {@link org.eclipse.jface.text.IRewriteTarget}) represents an facade offering the necessary methods to manipulate a document that is the input document of a text viewer. @since 2.0

  // Auto-close


  @Override
  public void createPartControl(Composite parent) {
    super.createPartControl(parent);
    ITextViewerExtension tve = (ITextViewerExtension)getSourceViewer();
    tve.appendVerifyKeyListener(new AutoCloser(this, (SourceViewer)getSourceViewer()));
  }

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      return;
    }


    fRelayoutRequired= false;
    if (fCachedTextViewer instanceof ITextViewerExtension) {
      ITextViewerExtension extension= (ITextViewerExtension) fCachedTextViewer;
      Control control= extension.getControl();
      if (control instanceof Composite && !control.isDisposed()) {
        Composite composite= (Composite) control;
        composite.layout(true);
      }
    }

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  public void setMarkAtCursor(boolean set) {


    if (!(fViewer instanceof ITextViewerExtension))
      return;


    ITextViewerExtension viewerExtension= ((ITextViewerExtension) fViewer);


    if (set) {
      Point selection= fViewer.getSelectedRange();
      viewerExtension.setMark(selection.x);


      fStatusLine.setErrorMessage(""); //$NON-NLS-1$
      fStatusLine.setMessage(EditorMessages.Editor_mark_status_message_mark_set);


    } else {
      viewerExtension.setMark(-1);


      fStatusLine.setErrorMessage(""); //$NON-NLS-1$
      fStatusLine.setMessage(EditorMessages.Editor_mark_status_message_mark_cleared);
    }
  }

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  public void swapMarkAndCursor() {


    if (!(fViewer instanceof ITextViewerExtension))
      return;


    ITextViewerExtension viewerExtension= ((ITextViewerExtension) fViewer);


    int markPosition= viewerExtension.getMark();
    if (markPosition == -1) {
      fStatusLine.setErrorMessage(EditorMessages.MarkRegionTarget_markNotSet);
      fStatusLine.setMessage(""); //$NON-NLS-1$
      return;
    }


    if (!isVisible(fViewer, markPosition)) {
      fStatusLine.setErrorMessage(EditorMessages.MarkRegionTarget_markNotVisible);
      fStatusLine.setMessage(""); //$NON-NLS-1$
      return;
    }


    Point selection= fViewer.getSelectedRange();
    viewerExtension.setMark(selection.x);


    fViewer.setSelectedRange(markPosition, 0);
    fViewer.revealRange(markPosition, 0);


    fStatusLine.setErrorMessage(""); //$NON-NLS-1$

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     */
    public void install() {
      if (!fIsInstalled) {


        if (fSourceViewer instanceof ITextViewerExtension) {
          ITextViewerExtension e= (ITextViewerExtension) fSourceViewer;
          e.prependVerifyKeyListener(this);
        } else {
          StyledText text= fSourceViewer.getTextWidget();
          text.addVerifyKeyListener(this);
        }

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     */
    public void uninstall() {
      if (fIsInstalled) {


        if (fSourceViewer instanceof ITextViewerExtension) {
          ITextViewerExtension e= (ITextViewerExtension) fSourceViewer;
          e.removeVerifyKeyListener(this);
        } else if (fSourceViewer != null) {
          StyledText text= fSourceViewer.getTextWidget();
          if (text != null && !text.isDisposed())
            text.removeVerifyKeyListener(fActivationCodeTrigger);
        }

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      int topIndex= sourceViewer.getTopIndex();


      StyledText styledText= sourceViewer.getTextWidget();
      Control parent= styledText;
      if (sourceViewer instanceof ITextViewerExtension) {
        ITextViewerExtension extension= (ITextViewerExtension) sourceViewer;
        parent= extension.getControl();
      }


      parent.setRedraw(false);


      styledText.setFont(font);

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    if (ITextOperationTarget.class.equals(required))
      return (fSourceViewer == null ? null : fSourceViewer.getTextOperationTarget());


    if (IRewriteTarget.class.equals(required)) {
      if (fSourceViewer instanceof ITextViewerExtension) {
        ITextViewerExtension extension= (ITextViewerExtension) fSourceViewer;
        return extension.getRewriteTarget();
      }
      return null;
    }


    if (Control.class.equals(required))

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            return;
        }


        Utils.runSafeSWTSync(log, new Runnable() {
            public void run() {
                ITextViewerExtension textViewer = (ITextViewerExtension) EditorAPI
                    .getViewer(editorPart);


                if (textViewer == null)
                    return;


                boolean isEditable = !lockedEditors.contains(editorPart);


                // Already as we want it?
                if (newIsEditable == isEditable)
                    return;


                log.trace(editorPart.getEditorInput().getName()
                    + " set to editable: " + newIsEditable);
                updateStatusLine(editorPart, newIsEditable);


                if (newIsEditable) {
                    lockedEditors.remove(editorPart);
                    textViewer
                        .removeVerifyKeyListener(EditorAPI.this.keyVerifier);


                    // enable editing and undo-manager
                    SourceViewer sourceViewer = (SourceViewer) textViewer;
                    sourceViewer.setEditable(true);


                    // TODO use undoLevel from Preferences (TextEditorPlugin)
                    sourceViewer.getUndoManager().setMaximalUndoLevel(200);


                } else {
                    lockedEditors.add(editorPart);
                    textViewer
                        .prependVerifyKeyListener(EditorAPI.this.keyVerifier);


                    // disable editing and undo-manager
                    SourceViewer sourceViewer = (SourceViewer) textViewer;
                    sourceViewer.setEditable(false);

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      runnable.run();
  }


  private void endCompoundChange() {
    if (fHasOpenCompoundChange) {
      ITextViewerExtension extension= (ITextViewerExtension) fCurrentTarget.getViewer();
      IRewriteTarget target= extension.getRewriteTarget();
      target.endCompoundChange();
      fHasOpenCompoundChange= false;
    }
  }

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