Examples of org.eclipse.jface.text.source.ISourceViewer

org.eclipse.jface.text.source.ISourceViewer
In addition to the text viewer functionality a source viewer supports:
- visual annotations based on an annotation model
- visual range indication
- management of text viewer add-ons
- explicit configuration
It is assumed that range indication and visual annotations are shown inside the same presentation area. There are no assumptions about whether this area is different from the viewer's text widget.
As the visibility of visual annotations can dynamically be changed, it is assumed that the annotation presentation area can dynamically be hidden if it is different from the text widget.
In order to provide backward compatibility for clients of ISourceViewer, extension interfaces are used as a means of evolution. The following extension interfaces exist:
- {@link org.eclipse.jface.text.source.ISourceViewerExtension} since version 2.1introducing the concept of an annotation overview.
- {@link org.eclipse.jface.text.source.ISourceViewerExtension2} since version 3.0allowing source viewers to roll back a previously performed configuration and allows access to the viewer's visual annotation model.
- {@link org.eclipse.jface.text.source.ISourceViewerExtension3} since version 3.2introducing the concept of a quick assist assistant and providing access to the quick assist invocation context as well as the current annotation hover.
- {@link org.eclipse.jface.text.source.ISourceViewerExtension4} since version 3.4introducing API to access a minimal set of content assistant APIs.
Clients may implement this interface and its extension interfaces or use the default implementation provided by {@link org.eclipse.jface.text.source.SourceViewer}.
@see org.eclipse.jface.text.source.ISourceViewerExtension @see org.eclipse.jface.text.source.ISourceViewerExtension2 @see org.eclipse.jface.text.source.ISourceViewerExtension3 @see org.eclipse.jface.text.source.ISourceViewerExtension4

        super.run();
    }


    @Override
    public boolean appliesAt(final IQuickAssistInvocationContext invocationContext) {
        final ISourceViewer viewer = invocationContext.getSourceViewer();


        final IEditorPart editorPart = PlatformUI.getWorkbench()
                .getActiveWorkbenchWindow().getActivePage().getActiveEditor();
        if (!(editorPart instanceof ErlangEditor)) {
            return false;
        }
        final ErlangEditor editor = (ErlangEditor) editorPart;
        if (editor.getViewer() != viewer) {
            return false;
        }


        final IErlModule module = editor.getModule();


        final int offset = invocationContext.getOffset();
        final ErlToken token = module.getScanner().getTokenAt(offset);
        if (token == null || token.getKind() != ErlToken.KIND_STRING) {
            return false;
        }
        final IDocument doc = viewer.getDocument();
        String text;
        try {
            text = doc.get(token.getOffset(), token.getLength());
            if (text.contains("\n")) {
                return true;

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        /**
         * Does the actual toggling of projection.
         */
        @SuppressWarnings("synthetic-access")
        private void toggleFolding() {
            final ISourceViewer sourceViewer = getSourceViewer();
            if (sourceViewer instanceof ProjectionViewer) {
                final ProjectionViewer pv = (ProjectionViewer) sourceViewer;
                if (pv.isProjectionMode() != EditorUtility.isFoldingEnabled()) {
                    if (pv.canDoOperation(ProjectionViewer.TOGGLE)) {
                        pv.doOperation(ProjectionViewer.TOGGLE);

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        if (colorManager != null) {
            colorManager.dispose();
            colorManager = null;
        }


        final ISourceViewer sourceViewer = getSourceViewer();
        if (sourceViewer instanceof ITextViewerExtension) {
            ((ITextViewerExtension) sourceViewer)
                    .removeVerifyKeyListener(getBracketInserter());
        }
        if (fActionGroups != null) {

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    }


    class OccurrencesFinderJobCanceler implements IDocumentListener, ITextInputListener {


        public void install() {
            final ISourceViewer sourceViewer = editor.getViewer();
            if (sourceViewer == null) {
                return;
            }


            final StyledText text = sourceViewer.getTextWidget();
            if (text == null || text.isDisposed()) {
                return;
            }


            sourceViewer.addTextInputListener(this);


            final IDocument document = sourceViewer.getDocument();
            if (document != null) {
                document.addDocumentListener(this);
            }
        }

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                document.addDocumentListener(this);
            }
        }


        public void uninstall() {
            final ISourceViewer sourceViewer = editor.getViewer();
            if (sourceViewer != null) {
                sourceViewer.removeTextInputListener(this);
            }


            final IDocumentProvider documentProvider = editor.getDocumentProvider();
            if (documentProvider != null) {
                final IDocument document = documentProvider.getDocument(editor

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        if (colorManager != null) {
            colorManager.dispose();
            colorManager = null;
        }


        final ISourceViewer sourceViewer = getSourceViewer();
        if (sourceViewer instanceof IDisposable) {
            ((IDisposable) sourceViewer).dispose();
        }


        final IEclipsePreferences node = ErlideUIPlugin.getPrefsNode();

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    /**
     * Jumps to the matching bracket.
     */
    public void gotoMatchingBracket() {


        final ISourceViewer sourceViewer = getSourceViewer();
        final IDocument document = sourceViewer.getDocument();
        if (document == null) {
            return;
        }


        final IRegion selection = getSignedSelection(sourceViewer);


        final int selectionLength = Math.abs(selection.getLength());
        if (selectionLength > 1) {
            setStatusLineErrorMessage(ErlangEditorMessages.GotoMatchingBracket_error_invalidSelection);
            sourceViewer.getTextWidget().getDisplay().beep();
            return;
        }


        // #26314
        final int sourceCaretOffset = selection.getOffset() + selection.getLength();
        // TODO fix me!
        // if (isSurroundedByBrackets(document, sourceCaretOffset))
        // sourceCaretOffset -= selection.getLength();


        final IRegion region = getBracketMatcher().match(document, sourceCaretOffset);
        if (region == null) {
            setStatusLineErrorMessage(ErlangEditorMessages.GotoMatchingBracket_error_noMatchingBracket);
            sourceViewer.getTextWidget().getDisplay().beep();
            return;
        }


        final int offset = region.getOffset();
        final int length = region.getLength();


        if (length < 1) {
            return;
        }


        final int anchor = getBracketMatcher().getAnchor();
        // http://dev.eclipse.org/bugs/show_bug.cgi?id=34195
        int targetOffset = ICharacterPairMatcher.RIGHT == anchor ? offset + 1 : offset
                + length;


        boolean visible = false;
        if (sourceViewer instanceof ITextViewerExtension5) {
            final ITextViewerExtension5 extension = (ITextViewerExtension5) sourceViewer;
            visible = extension.modelOffset2WidgetOffset(targetOffset) > -1;
        } else {
            final IRegion visibleRegion = sourceViewer.getVisibleRegion();
            // http://dev.eclipse.org/bugs/show_bug.cgi?id=34195
            visible = targetOffset >= visibleRegion.getOffset()
                    && targetOffset <= visibleRegion.getOffset()
                            + visibleRegion.getLength();
        }


        if (!visible) {
            setStatusLineErrorMessage(ErlangEditorMessages.GotoMatchingBracket_error_bracketOutsideSelectedElement);
            sourceViewer.getTextWidget().getDisplay().beep();
            return;
        }


        if (selection.getLength() < 0) {
            targetOffset -= selection.getLength();
        }


        sourceViewer.setSelectedRange(targetOffset, selection.getLength());
        sourceViewer.revealRange(targetOffset, selection.getLength());
    }

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        }


    }


    protected ISourceReference computeHighlightRangeSourceReference() {
        final ISourceViewer sourceViewer = getSourceViewer();
        if (sourceViewer == null) {
            return null;
        }


        final StyledText styledText = sourceViewer.getTextWidget();
        if (styledText == null) {
            return null;
        }


        int caret = 0;
        if (sourceViewer instanceof ITextViewerExtension5) {
            final ITextViewerExtension5 extension = (ITextViewerExtension5) sourceViewer;
            caret = extension.widgetOffset2ModelOffset(styledText.getCaretOffset());
        } else {
            final int offset = sourceViewer.getVisibleRegion().getOffset();
            caret = offset + styledText.getCaretOffset();
        }


        final IErlElement element = getElementAt(caret, false);

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        if (reference != null) {


            StyledText textWidget = null;


            final ISourceViewer sourceViewer = getSourceViewer();
            if (sourceViewer == null) {
                return;
            }
            textWidget = sourceViewer.getTextWidget();


            if (textWidget == null) {
                return;
            }


            try {
                ISourceRange range = null;
                range = reference.getSourceRange();


                if (range == null) {
                    return;
                }


                int offset = range.getOffset();
                int length = range.getLength();


                if (offset < 0 || length < 0) {
                    return;
                }


                setHighlightRange(offset, length, moveCursor);


                if (!moveCursor) {
                    return;
                }


                offset = -1;
                length = -1;


                if (reference instanceof IErlMember) {
                    range = ((IErlMember) reference).getNameRange();
                    if (range != null) {
                        offset = range.getOffset();
                        length = range.getLength();
                    }
                } else if (reference instanceof IErlAttribute) {
                    range = ((IErlAttribute) reference).getNameRange();
                    if (range != null) {
                        offset = range.getOffset();
                        length = range.getLength();
                    }


                } else if (reference instanceof IErlFunctionClause) {
                    range = ((IErlFunctionClause) reference).getNameRange();
                    if (range != null) {
                        offset = range.getOffset();
                        length = range.getLength();
                    }
                }
                if (offset > -1 && length > 0) {


                    try {
                        textWidget.setRedraw(false);
                        sourceViewer.revealRange(offset, length);
                        sourceViewer.setSelectedRange(offset, length);
                    } finally {
                        textWidget.setRedraw(true);
                    }


                    markInNavigationHistory();

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    }


    @Override
    protected void handlePreferenceStoreChanged(final PropertyChangeEvent event) {
        final String property = event.getProperty();
        final ISourceViewer sourceViewer = getSourceViewer();
        try {
            if (PreferenceConstants.EDITOR_FOLDING_ENABLED.equals(property)) {
                if (sourceViewer instanceof ProjectionViewer) {
                    new ToggleFoldingRunner().runWhenNextVisible();
                }

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