Java Code Examples for org.eclipse.ui.texteditor.ITextEditor#showsHighlightRangeOnly()

@Override
public void run() {

	ITextEditor editor= getTextEditor();
	if (editor == null)
		return;

	IRegion remembered= editor.getHighlightRange();
	editor.resetHighlightRange();

	boolean showAll= !editor.showsHighlightRangeOnly();
	setChecked(showAll);

	editor.showHighlightRangeOnly(showAll);
	if (remembered != null)
		editor.setHighlightRange(remembered.getOffset(), remembered.getLength(), true);

	fStore.removePropertyChangeListener(this);
	fStore.setValue(PreferenceConstants.EDITOR_SHOW_SEGMENTS, showAll);
	fStore.addPropertyChangeListener(this);
}
 

@Override
public void update() {
	ITextEditor editor= getTextEditor();
	boolean checked= (editor != null && editor.showsHighlightRangeOnly());
	setChecked(checked);
	if (editor instanceof CompilationUnitEditor) {
		IWorkingCopyManager manager= JavaPlugin.getDefault().getWorkingCopyManager();
		setEnabled(manager.getWorkingCopy(editor.getEditorInput()) != null);
	} else if (editor instanceof ClassFileEditor) {
		IEditorInput input= editor.getEditorInput();
		IClassFile cf= null;
		if (input instanceof IClassFileEditorInput) {
			IClassFileEditorInput cfi= (IClassFileEditorInput)input;
			cf= cfi.getClassFile();
		}
		setEnabled(cf != null && cf.exists());
	} else
		setEnabled(editor != null);
}
 

/**
 * Synchronizes the appearance of the editor with what the preference store tells him.
 *
 * @param editor the text editor
 */
private void synchronizeWithPreference(ITextEditor editor) {

	if (editor == null)
		return;

	boolean showSegments= fStore.getBoolean(PreferenceConstants.EDITOR_SHOW_SEGMENTS);
	setChecked(showSegments);

	if (editor.showsHighlightRangeOnly() != showSegments) {
		IRegion remembered= editor.getHighlightRange();
		editor.resetHighlightRange();
		editor.showHighlightRangeOnly(showSegments);
		if (remembered != null)
			editor.setHighlightRange(remembered.getOffset(), remembered.getLength(), true);
	}
}
 

/**
 * Wrap selection provider setSelection within a block disabling highlight
 * range to protect against the JavaEditor from changing the narrow focus in
 * - org.eclipse.jdt.internal.ui.javaeditor.TogglePresentationAction -
 * 
 * @param editor
 * @param selection
 *            in model coords
 */
public static ITextSelection setSelection(ITextEditor editor, ITextSelection selection) {
	boolean isNarrow = editor.showsHighlightRangeOnly();
	// Use the text widget, as the IRewriteTarget has unpleasant scrolling side effects 
	Control text = getTextWidget(editor);
	try {
		text.setRedraw(false);
		if (isNarrow) {
			editor.showHighlightRangeOnly(false);
		}
		editor.getSelectionProvider().setSelection(selection);
	} finally {
		if (isNarrow) {
			editor.showHighlightRangeOnly(isNarrow);
		}
		text.setRedraw(true);
	}
	return selection;
}
 

/**
 * @see com.mulgasoft.emacsplus.commands.EmacsPlusCmdHandler#transform(ITextEditor, IDocument, ITextSelection, ExecutionEvent)
 */
@Override
protected int transform(ITextEditor editor, IDocument document, ITextSelection currentSelection, ExecutionEvent event) 
throws BadLocationException {

	// clear status area
	EmacsPlusUtils.clearMessage(editor);
	EmacsMovementHandler.clearShifted(); // set mark always removes shift select flag
	beep();
	int offset = NO_OFFSET;
	if (currentSelection.getLength() > 0) {
		// when region is narrowed, avoid provoking a range update in eclipse code 
		if (editor.showsHighlightRangeOnly()) {
			MarkUtils.setSelection(editor, getCursorOffset(editor), 0);
		} else {
			offset = getCursorOffset(editor);	
		}
	}
	return offset;
}
 

/**
 * @see com.mulgasoft.emacsplus.commands.EmacsPlusNoEditHandler#transform(org.eclipse.ui.texteditor.ITextEditor, org.eclipse.jface.text.IDocument, org.eclipse.jface.text.ITextSelection, org.eclipse.core.commands.ExecutionEvent)
 */
@Override
protected int transform(ITextEditor editor, IDocument document, ITextSelection currentSelection,
		ExecutionEvent event) throws BadLocationException {
	
	int nLine = document.getLineOfOffset(getCursorOffset(editor,currentSelection));
	String msg = String.format(LINE, nLine+1);
	if (editor.showsHighlightRangeOnly()) {
		int nhLine = nLine - document.getLineOfOffset(editor.getHighlightRange().getOffset());
		msg += String.format(H_LINE, nhLine+1); 
	}
	asyncShowMessage(editor, msg, false);
	return super.transform(editor, document, currentSelection, event);
}
 

/**
 * Determine the correct set of lines and delete the whitespace at the end of each of them.
 * 
 * @see com.mulgasoft.emacsplus.commands.EmacsPlusCmdHandler#transform(ITextEditor, IDocument, ITextSelection, ExecutionEvent)
 */
@Override
protected int transform(ITextEditor editor, IDocument document, ITextSelection currentSelection,
		ExecutionEvent event) throws BadLocationException {
	int result = NO_OFFSET;
	int lastLine = 0;
	int firstLine = 0;
	int maxOffset = Integer.MAX_VALUE;		
	if (editor.showsHighlightRangeOnly()) {
		// if the buffer is narrowed, then operate on precise region
		IRegion narrow = editor.getHighlightRange();
		int lastOffset = narrow.getOffset() + narrow.getLength();
		firstLine = document.getLineOfOffset(narrow.getOffset()); 
		lastLine = document.getLineOfOffset(lastOffset);
		IRegion endInfo = document.getLineInformationOfOffset(lastOffset);
		if (endInfo.getOffset() != lastOffset) {
			// point maxOffset at the last character in the narrowed region
			maxOffset = lastOffset -1;
		} else {
			// back up if we're at the first offset of the last line
			lastLine--;
		}
	} else {
		lastLine = document.getNumberOfLines() -1;
	}
	if (firstLine <= lastLine) {
		Position coff = new Position(getCursorOffset(editor,currentSelection),0);
		try {
			// record the position so we can restore it after any whitespace deletions
			document.addPosition(coff);
			deleteWhitepace(lastLine,firstLine,maxOffset,document);
		} catch (BadLocationException e) {
			// shouldn't happen, but alert user if it does
			asyncShowMessage(editor,BAD_LOCATION_ERROR,true);
		} finally {
			result = coff.getOffset();
			document.removePosition(coff);
		}
	}
	return result;
}
 

/**
 * Check if we're at buffer top (or top of narrowed region)
 * 
 * @param editor
 * @param selection
 * @return true is condition satisfied, else false
 */
boolean isAtTop(ITextEditor editor, ITextSelection selection) {
	// if we're not at buffer top (or top of narrowed region)
	return (selection.getOffset() == 0 || 
			(editor.showsHighlightRangeOnly() && selection.getOffset() == editor.getHighlightRange().getOffset()));
}