Java 类com.google.gwt.dom.client.Text 实例源码

/**
 * @see RawDocument#deleteData(Object, int, int)
 */
void deleteData(int offset, int count, boolean affectImpl) {
  String data = getData();

  setContentData(data.substring(0, offset) + data.substring(offset + count, data.length()));

  if (affectImpl) {
    if (isImplAttached()) {
      findNodeletWithOffset(offset, nodeletOffsetOutput, getRepairer());
      Text nodelet = nodeletOffsetOutput.getNode().cast();
      int subOffset = nodeletOffsetOutput.getOffset();

      if (nodelet.getLength() - subOffset >= count) {
        // Handle the special case where the delete is in a single text nodelet
        // carefully, to avoid splitting it
        nodelet.deleteData(subOffset, count);
        getExtendedContext().editing().textNodeletAffected(
            nodelet, subOffset, -count, TextNodeChangeType.DATA);
      } else {
        // General case
        Node toExcl = implSplitText(offset + count);
        Node fromIncl = implSplitText(offset);

        HtmlView filteredHtml = getFilteredHtmlView();
        for (Node node = fromIncl; node != toExcl && node != null;) {
          Node next = filteredHtml.getNextSibling(node);
          node.removeFromParent();
          node = next;
        }
      }
    } else {
      // TODO(user): have these assertion failure fixed (b/2129931)
      // assert getImplNodelet().getLength() == getLength() :
      //    "text node's html impl not normalised while not attached to html dom";
      getImplNodelet().deleteData(offset, count);
    }
  }
}

private boolean matchesSelectionTextNodes(Text nodelet, int affectedAfterOffset) {
  if (savedSelection == null) {
    return false;
  }
  if (savedSelection.isOrdered()) {
    if (nodelet == savedSelectionAnchorTextNodelet) {
      return savedSelectionAnchorOffset > affectedAfterOffset;
    } else if (nodelet == savedSelectionFocusTextNodelet) {
      return true;
    }
  } else {
    // The inverse of the above
    if (nodelet == savedSelectionFocusTextNodelet) {
      return savedSelectionFocusOffset > affectedAfterOffset;
    } else if (nodelet == savedSelectionAnchorTextNodelet) {
      return true;
    }
  }
  return false;
}

/**
 * @see RawDocument#insertData(Object, int, String)
 */
void insertData(int offset, String arg, boolean affectImpl) {
  String data = getData();
  setContentData(
      data.substring(0, offset) +
      arg +
      data.substring(offset, data.length()));

  if (affectImpl) {
    // NOTE(user): There is an issue here. When findNodeletWihOffset causes a
    // repair, the data may get inserted twice. The repairer may set the DOM
    // node to reflect the updated content data (which already has the data
    // inseretd). Then, when insertData is called, the data is inserted again.
    findNodeletWithOffset(offset, nodeletOffsetOutput, getRepairer());
    Text nodelet = nodeletOffsetOutput.getNode().<Text>cast();
    int nodeletOffset = nodeletOffsetOutput.getOffset();
    nodelet.insertData(nodeletOffset, arg);
    getExtendedContext().editing().textNodeletAffected(
        nodelet, nodeletOffset, arg.length(), TextNodeChangeType.DATA);
  }
}

/**
 * Splits and returns the second.
 * If split point at a node boundary, doesn't split, but returns the next nodelet.
 */
private Text implSplitText(int offset) {
  findNodeletWithOffset(offset, nodeletOffsetOutput, getRepairer());
  Text text = nodeletOffsetOutput.getNode().<Text>cast();
  if (text.getLength() == nodeletOffsetOutput.getOffset()) {
    return text.getNextSibling().cast();
  } else if (nodeletOffsetOutput.getOffset() == 0) {
    return text;
  } else {
    int nodeletOffset = nodeletOffsetOutput.getOffset();
    Text ret = text.splitText(nodeletOffset);
    // -10000 because the number should be ignored in the splitText case,
    // so some large number to trigger an error if it is not ignored.
    getExtendedContext().editing().textNodeletAffected(
        text, nodeletOffset, -10000, TextNodeChangeType.SPLIT);
    return ret;
  }
}

/**
 * Implementation of {@link #getOffset(Text, Node)} that is not bound to any
 * specific ContentTextNode
 */
public static int getOffset(Text textNodelet, Text startNode, Node nextImpl, HtmlView view) {
  int offset = 0;
  for (Text nodelet = startNode; nodelet != nextImpl;
      nodelet = view.getNextSibling(nodelet).cast()) {
    if (nodelet == textNodelet) {
      return offset;
    }
    offset += nodelet.getLength();
  }

  // Programming error, this method assumes the input state was valid,
  // unlike other methods which don't
  throw new EditorRuntimeException("Didn't find text nodelet to get offset for");
}

/**
 * Same as {@link #findNodeletWithOffset(int, HtmlPoint)}, but does not do
 * a consistency check. Instead it accepts the impl nodelet of the next
 * wrapper (or null) and assumes everthing is consistent.
 */
public void findNodeletWithOffset(int offset, HtmlPoint output, Node nextImpl) {
  HtmlView filteredHtml = getFilteredHtmlView();

  int sum = 0;
  int prevSum;
  for (Text nodelet = getImplNodelet(); nodelet != nextImpl;
      nodelet = filteredHtml.getNextSibling(nodelet).cast()) {
    prevSum = sum;
    sum += nodelet.getLength();
    if (sum >= offset) {
      output.setNode(nodelet);
      output.setOffset(offset - prevSum);
      return;
    }
  }

  output.setNode(null);
}

/**
 * Deals with a dom mutation event, deciding if it is damaging or not.
 *
 * WARNING: This method should NOT be called for mutation events that are a
 * result of programmatic changes - only for changes that the browser did by
 * itself and we need to investigate. Doing otherwise will result in
 * programmatic changes being reverted!
 *
 * @param event a dom mutation event
 */
public void handleMutationEvent(SignalEvent event) {
  // TODO(user): Do we care about other types of events?
  if (event.getType().equals("DOMNodeRemoved")) {
    Node target = event.getTarget();
    boolean ignorableWhenEmpty = DomHelper.isTextNode(target)
        || !NodeManager.hasBackReference(target.<Element>cast());
    if (ignorableWhenEmpty && entries.isEmpty()) {
      // If it's a text node, or a non-backreferenced element,
      // and we don't already have entries, then we just ignore it as regular typing. Ok.
    } else {

      EditorStaticDeps.logger.trace().log("REVERT REMOVAL: " + (DomHelper.isTextNode(target)
          ? target.<Text>cast().getData() : target.<Element>cast().getTagName()));

      addEntry(new RemovalEntry(target, target.getParentElement(), target.getNextSibling(),
          ignorableWhenEmpty));
    }
  }
}

private boolean isPartOfThisState(Point<Node> point) {

      checkRangeIsValid();

      Text node = point.isInTextNode()
        ? point.getContainer().<Text>cast()
        : null;

      if (node == null) {
        // If we're not in a text node - i.e. we just started typing
        // either in an empty element, or between elements.
        if (htmlRange.getNodeAfter() == point.getNodeAfter()
            && htmlRange.getContainer() == point.getContainer()) {
          return true;
        } else if (point.getNodeAfter() == null) {
          return false;
        } else {
          return partOfMutatingRange(point.getNodeAfter());
        }
      }

      // The first check is redundant but speeds up the general case
      return node == lastTextNode || partOfMutatingRange(node);
    }

void checkForWebkitEndOfLinkHack(SignalEvent signal) {
  // If it's inserting text
  if (DomHelper.isTextNode(signal.getTarget()) &&
      (signal.getType().equals(JsEvents.DOM_CHARACTER_DATA_MODIFIED) ||
       signal.getType().equals(JsEvents.DOM_NODE_INSERTED))) {

    Text textNode = signal.getTarget().cast();
    if (textNode.getLength() > 0) {
      Node e = textNode.getPreviousSibling();
      if (e != null && !DomHelper.isTextNode(e)
          && e.<Element>cast().getTagName().toLowerCase().equals("a")) {

        FocusedPointRange<Node> selection =  editorInteractor.getHtmlSelection();
        if (selection.isCollapsed() && selection.getFocus().getTextOffset() == 0) {
          editorInteractor.noteWebkitEndOfLinkHackOccurred(textNode);
        }
      }
    }
  }
}

/**
 * Converts the given point to a parent-nodeAfter point, splitting a
 * text node if necessary.
 *
 * @param point
 * @return a point at the same location, between node boundaries
 */
public static Point.El<Node> forceElementPoint(Point<Node> point) {
  Point.El<Node> elementPoint = point.asElementPoint();
  if (elementPoint != null) {
    return elementPoint;
  }
  Element parent;
  Node nodeAfter;
  Text text = point.getContainer().cast();
  parent = text.getParentElement();
  int offset = point.getTextOffset();
  if (offset == 0) {
    nodeAfter = text;
  } else if (offset == text.getLength()) {
    nodeAfter = text.getNextSibling();
  } else {
    nodeAfter = text.splitText(offset);
  }
  return Point.inElement(parent, nodeAfter);
}

public void testImplDataSumsTextNodes() throws HtmlMissing {
  ContentDocument dom = TestEditors.createTestDocument();
  c = dom.debugGetRawDocument();
  ContentElement root = c.getDocumentElement();

  ContentTextNode t1 = c.createTextNode("hello", root, null);
  Text txt = t1.getImplNodelet();

  assertEquals("hello", t1.getImplData());
  Text txt3 = Document.get().createTextNode(" there");
  txt.getParentNode().insertAfter(txt3, txt);
  assertEquals("hello there", t1.getImplData());
  Text txt2 = txt.splitText(2);
  assertEquals("hello there", t1.getImplData());
  assertSame(txt3, txt.getNextSibling().getNextSibling());
  assertTrue(t1.owns(txt) && t1.owns(txt2) && t1.owns(txt3));

  ContentTextNode t2 = c.createTextNode("before", root, t1);

  assertEquals("before", t2.getImplData());
  Text t2_2 = t2.getImplNodelet().splitText(3);
  assertEquals("before", t2.getImplData());
  assertTrue(t2.owns(t2_2));
}

public void testDeleteWithRangeSelectedDeletesRange() {
  FakeEditorEvent fakeEvent = FakeEditorEvent.create(KeySignalType.DELETE, KeyCodes.KEY_LEFT);

  //Event event = Document.get().createKeyPressEvent(
  //    false, false, false, false, KeyCodes.KEY_BACKSPACE, 0).cast();

  Text input = Document.get().createTextNode("ABCDE");
  ContentNode node = new ContentTextNode(input, null);

  final Point<ContentNode> start = Point.inText(node, 1);
  final Point<ContentNode> end = Point.inText(node, 4);
  FakeEditorInteractor interactor = setupFakeEditorInteractor(
      new FocusedContentRange(start, end));
  EditorEventsSubHandler subHandler = new FakeEditorEventsSubHandler();
  EditorEventHandler handler = createEditorEventHandler(interactor, subHandler);

  interactor.call(FakeEditorInteractor.DELETE_RANGE).nOf(1).withArgs(
      start, end, false).returns(start);

  handler.handleEvent(fakeEvent);
  interactor.checkExpectations();
}

private void deleteText(int amount) {
  Point<Node> sel = getSelectionStart();
  Text txt = sel == null ? null : sel.getContainer().<Text>cast();
  int startIndex = sel.getTextOffset(), len;
  while (amount > 0) {
    if (txt == null || !DomHelper.isTextNode(txt)) {
      throw new RuntimeException("Action ran off end of text node");
    }
    String data = txt.getData();
    int remainingInNode = data.length() - startIndex;
    if (remainingInNode >= amount) {
      len = amount;
    } else {
      len = remainingInNode;
    }
    txt.setData(data.substring(0, startIndex) + data.substring(startIndex + len));
    amount -= len;
    startIndex = 0;
    txt = htmlView.getNextSibling(txt).cast();
  }
  moveCaret(0);
}

public void testGenerateOutputMultipleContentNodes() {
    Element container = Document.get().createDivElement();
    mBody.appendChild(container);

    Element content1 = Document.get().createPElement();
    content1.appendChild(Document.get().createTextNode("Some text content 1."));
    container.appendChild(content1);

    Element content2 = Document.get().createPElement();
    content2.appendChild(Document.get().createTextNode("Some text content 2."));
    container.appendChild(content2);

    WebTextBuilder builder = new WebTextBuilder();

    builder.textNode(Text.as(content1.getChild(0)), 0);
    builder.textNode(Text.as(content2.getChild(0)), 0);

    WebText text = builder.build(0);

    String got = text.generateOutput(false);
    String want = "<div><p>Some text content 1.</p><p>Some text content 2.</p></div>";

    assertEquals(want, TestUtil.removeAllDirAttributes(got));
}

public void testGenerateOutputSingleContentNode() {
    Element container = Document.get().createDivElement();
    mBody.appendChild(container);

    Element content1 = Document.get().createPElement();
    content1.appendChild(Document.get().createTextNode("Some text content 1."));
    container.appendChild(content1);

    Element content2 = Document.get().createPElement();
    content2.appendChild(Document.get().createTextNode("Some non-content."));
    container.appendChild(content2);

    WebTextBuilder builder = new WebTextBuilder();

    builder.textNode(Text.as(content1.getChild(0)), 0);

    WebText text = builder.build(0);

    String got = text.generateOutput(false);
    String want = "<p>Some text content 1.</p>";

    assertEquals(want, TestUtil.removeAllDirAttributes(got));
}

private void resetInner() {
    this.anchor.getElement().removeAllChildren();
    if (this.iconType != null) {
        Icon icon = new Icon();
        icon.setType(this.iconType);

        this.anchor.getElement().appendChild(icon.getElement());
    }
    if (this.label != null) {
        Text textElem = Document.get().createTextNode(this.label);
        this.anchor.getElement().appendChild(textElem);
    }
    Text spaceElem = Document.get().createTextNode(" ");
    this.anchor.getElement().appendChild(spaceElem);
    this.anchor.getElement().appendChild(this.caret);
}

private void resetInner() {
    if (this.elementExists()) {
        Element element = this.getElement();
        element.removeAllChildren();
        boolean rendervalue = Boolean.TRUE.equals(this.getValue());
        if (this.outputType != RenderType.TEXT) {
            Icon icon = rendervalue ? this.trueIcon : this.falseIcon;
            if (icon != null) {
                element.appendChild(icon.getElement());
            }
        }
        if (this.outputType != RenderType.ICON) {
            Text textElem = Document.get().createTextNode(rendervalue ? this.trueLabel : this.falseLabel);
            element.appendChild(textElem);
        }
    }
}

@Override
public void redraw() {
    this.getElement().removeAllChildren();
    for (Token<?> token : this.tokenList) {
        if (token.getContent() != null && token.getContent() instanceof CssRendererTokenContent
            && ((CssRendererTokenContent) token.getContent()).getCssStyle() != null) {
            SpanElement spanElement = Document.get().createSpanElement();
            spanElement.addClassName(((CssRendererTokenContent) token.getContent()).getCssStyle());
            spanElement.setInnerText(token.getText());
            this.getElement().appendChild(spanElement);
        } else {
            Text textElement = Document.get().createTextNode(token.getText());
            this.getElement().appendChild(textElement);
        }
    }
}

private boolean matchesSelectionTextNodes(Text nodelet, int affectedAfterOffset) {
  if (savedSelection == null) {
    return false;
  }
  if (savedSelection.isOrdered()) {
    if (nodelet == savedSelectionAnchorTextNodelet) {
      return savedSelectionAnchorOffset > affectedAfterOffset;
    } else if (nodelet == savedSelectionFocusTextNodelet) {
      return true;
    }
  } else {
    // The inverse of the above
    if (nodelet == savedSelectionFocusTextNodelet) {
      return savedSelectionFocusOffset > affectedAfterOffset;
    } else if (nodelet == savedSelectionAnchorTextNodelet) {
      return true;
    }
  }
  return false;
}

/**
 * @see RawDocument#insertData(Object, int, String)
 */
void insertData(int offset, String arg, boolean affectImpl) {
  String data = getData();
  setContentData(
      data.substring(0, offset) +
      arg +
      data.substring(offset, data.length()));

  if (affectImpl) {
    // NOTE(user): There is an issue here. When findNodeletWihOffset causes a
    // repair, the data may get inserted twice. The repairer may set the DOM
    // node to reflect the updated content data (which already has the data
    // inseretd). Then, when insertData is called, the data is inserted again.
    findNodeletWithOffset(offset, nodeletOffsetOutput, getRepairer());
    Text nodelet = nodeletOffsetOutput.getNode().<Text>cast();
    int nodeletOffset = nodeletOffsetOutput.getOffset();
    nodelet.insertData(nodeletOffset, arg);
    getExtendedContext().editing().textNodeletAffected(
        nodelet, nodeletOffset, arg.length(), TextNodeChangeType.DATA);
  }
}

/**
 * Splits and returns the second.
 * If split point at a node boundary, doesn't split, but returns the next nodelet.
 */
private Text implSplitText(int offset) {
  findNodeletWithOffset(offset, nodeletOffsetOutput, getRepairer());
  Text text = nodeletOffsetOutput.getNode().<Text>cast();
  if (text.getLength() == nodeletOffsetOutput.getOffset()) {
    return text.getNextSibling().cast();
  } else if (nodeletOffsetOutput.getOffset() == 0) {
    return text;
  } else {
    int nodeletOffset = nodeletOffsetOutput.getOffset();
    Text ret = text.splitText(nodeletOffset);
    // -10000 because the number should be ignored in the splitText case,
    // so some large number to trigger an error if it is not ignored.
    getExtendedContext().editing().textNodeletAffected(
        text, nodeletOffset, -10000, TextNodeChangeType.SPLIT);
    return ret;
  }
}

/**
 * Same as {@link #findNodeletWithOffset(int, HtmlPoint)}, but does not do
 * a consistency check. Instead it accepts the impl nodelet of the next
 * wrapper (or null) and assumes everthing is consistent.
 */
public void findNodeletWithOffset(int offset, HtmlPoint output, Node nextImpl) {
  HtmlView filteredHtml = getFilteredHtmlView();

  int sum = 0;
  int prevSum;
  for (Text nodelet = getImplNodelet(); nodelet != nextImpl;
      nodelet = filteredHtml.getNextSibling(nodelet).cast()) {
    prevSum = sum;
    sum += nodelet.getLength();
    if (sum >= offset) {
      output.setNode(nodelet);
      output.setOffset(offset - prevSum);
      return;
    }
  }

  output.setNode(null);
}

/**
 * Deals with a dom mutation event, deciding if it is damaging or not.
 *
 * WARNING: This method should NOT be called for mutation events that are a
 * result of programmatic changes - only for changes that the browser did by
 * itself and we need to investigate. Doing otherwise will result in
 * programmatic changes being reverted!
 *
 * @param event a dom mutation event
 */
public void handleMutationEvent(SignalEvent event) {
  // TODO(user): Do we care about other types of events?
  if (event.getType().equals("DOMNodeRemoved")) {
    Node target = event.getTarget();
    boolean ignorableWhenEmpty = DomHelper.isTextNode(target)
        || !NodeManager.hasBackReference(target.<Element>cast());
    if (ignorableWhenEmpty && entries.isEmpty()) {
      // If it's a text node, or a non-backreferenced element,
      // and we don't already have entries, then we just ignore it as regular typing. Ok.
    } else {

      EditorStaticDeps.logger.trace().log("REVERT REMOVAL: " + (DomHelper.isTextNode(target)
          ? target.<Text>cast().getData() : target.<Element>cast().getTagName()));

      addEntry(new RemovalEntry(target, target.getParentElement(), target.getNextSibling(),
          ignorableWhenEmpty));
    }
  }
}

private boolean isPartOfThisState(Point<Node> point) {

      checkRangeIsValid();

      Text node = point.isInTextNode()
        ? point.getContainer().<Text>cast()
        : null;

      if (node == null) {
        // If we're not in a text node - i.e. we just started typing
        // either in an empty element, or between elements.
        if (htmlRange.getNodeAfter() == point.getNodeAfter()
            && htmlRange.getContainer() == point.getContainer()) {
          return true;
        } else if (point.getNodeAfter() == null) {
          return false;
        } else {
          return partOfMutatingRange(point.getNodeAfter());
        }
      }

      // The first check is redundant but speeds up the general case
      return node == lastTextNode || partOfMutatingRange(node);
    }

void checkForWebkitEndOfLinkHack(SignalEvent signal) {
  // If it's inserting text
  if (DomHelper.isTextNode(signal.getTarget()) &&
      (signal.getType().equals(BrowserEvents.DOMCharacterDataModified) ||
       signal.getType().equals(BrowserEvents.DOMNodeInserted))) {

    Text textNode = signal.getTarget().cast();
    if (textNode.getLength() > 0) {
      Node e = textNode.getPreviousSibling();
      if (e != null && !DomHelper.isTextNode(e)
          && e.<Element>cast().getTagName().toLowerCase().equals("a")) {

        FocusedPointRange<Node> selection =  editorInteractor.getHtmlSelection();
        if (selection.isCollapsed() && selection.getFocus().getTextOffset() == 0) {
          editorInteractor.noteWebkitEndOfLinkHackOccurred(textNode);
        }
      }
    }
  }
}

/**
 * Converts the given point to a parent-nodeAfter point, splitting a
 * text node if necessary.
 *
 * @param point
 * @return a point at the same location, between node boundaries
 */
public static Point.El<Node> forceElementPoint(Point<Node> point) {
  Point.El<Node> elementPoint = point.asElementPoint();
  if (elementPoint != null) {
    return elementPoint;
  }
  Element parent;
  Node nodeAfter;
  Text text = point.getContainer().cast();
  parent = text.getParentElement();
  int offset = point.getTextOffset();
  if (offset == 0) {
    nodeAfter = text;
  } else if (offset == text.getLength()) {
    nodeAfter = text.getNextSibling();
  } else {
    nodeAfter = text.splitText(offset);
  }
  return Point.inElement(parent, nodeAfter);
}

private void deleteText(int amount) {
  Point<Node> sel = getSelectionStart();
  Text txt = sel == null ? null : sel.getContainer().<Text>cast();
  int startIndex = sel.getTextOffset(), len;
  while (amount > 0) {
    if (txt == null || !DomHelper.isTextNode(txt)) {
      throw new RuntimeException("Action ran off end of text node");
    }
    String data = txt.getData();
    int remainingInNode = data.length() - startIndex;
    if (remainingInNode >= amount) {
      len = amount;
    } else {
      len = remainingInNode;
    }
    txt.setData(data.substring(0, startIndex) + data.substring(startIndex + len));
    amount -= len;
    startIndex = 0;
    txt = htmlView.getNextSibling(txt).cast();
  }
  moveCaret(0);
}

public void testImplDataSumsTextNodes() throws HtmlMissing {
  ContentDocument dom = TestEditors.createTestDocument();
  c = dom.debugGetRawDocument();
  ContentElement root = c.getDocumentElement();

  ContentTextNode t1 = c.createTextNode("hello", root, null);
  Text txt = t1.getImplNodelet();

  assertEquals("hello", t1.getImplData());
  Text txt3 = Document.get().createTextNode(" there");
  txt.getParentNode().insertAfter(txt3, txt);
  assertEquals("hello there", t1.getImplData());
  Text txt2 = txt.splitText(2);
  assertEquals("hello there", t1.getImplData());
  assertSame(txt3, txt.getNextSibling().getNextSibling());
  assertTrue(t1.owns(txt) && t1.owns(txt2) && t1.owns(txt3));

  ContentTextNode t2 = c.createTextNode("before", root, t1);

  assertEquals("before", t2.getImplData());
  Text t2_2 = t2.getImplNodelet().splitText(3);
  assertEquals("before", t2.getImplData());
  assertTrue(t2.owns(t2_2));
}

public void testDeleteWithRangeSelectedDeletesRange() {
  FakeEditorEvent fakeEvent = FakeEditorEvent.create(KeySignalType.DELETE, KeyCodes.KEY_LEFT);

  //Event event = Document.get().createKeyPressEvent(
  //    false, false, false, false, KeyCodes.KEY_BACKSPACE, 0).cast();

  Text input = Document.get().createTextNode("ABCDE");
  ContentNode node = new ContentTextNode(input, null);

  final Point<ContentNode> start = Point.inText(node, 1);
  final Point<ContentNode> end = Point.inText(node, 4);
  FakeEditorInteractor interactor = setupFakeEditorInteractor(
      new FocusedContentRange(start, end));
  EditorEventsSubHandler subHandler = new FakeEditorEventsSubHandler();
  EditorEventHandler handler = createEditorEventHandler(interactor, subHandler);

  interactor.call(FakeEditorInteractor.DELETE_RANGE).nOf(1).withArgs(
      start, end, false).returns(start);

  handler.handleEvent(fakeEvent);
  interactor.checkExpectations();
}

private void drawFromTemplate(VisualCoords center, String templateId, String text, final String id) {
    SVGElement target = (SVGElement) svg.getElementById(id);
    if (target == null) {
        target = (SVGElement) svg.getElementById(templateId);
        target = (SVGElement) target.cloneNode(true);
        target.setId(id);
        svg.getElementById("markers").appendChild(target);
    }
    target.getStyle().setProperty("pointerEvents", "none");
    target.getStyle().setVisibility(Visibility.VISIBLE);
    if(text != null) {
        SVGTSpanElement tspan = (SVGTSpanElement) target.getElementsByTagName("tspan").getItem(0);
        Text item = (Text) tspan.getChildNodes().getItem(0);
        item.setNodeValue(text);
    }
    target.setAttribute("transform", "translate(" + center.x + ", " + center.y + ")");
    bringToTop(target);
}

/**
 * @see LowLevelEditingConcerns#textNodeletAffected(Text, int, int, TextNodeChangeType)
 */
void textNodeletAffected(Text nodelet, int affectedAfterOffset, int insertionAmount,
    TextNodeChangeType changeType) {

  if (needToRestoreSelection == true) {
    return;
  }
  switch (changeType) {
  case DATA:
    if (!QuirksConstants.OK_SELECTION_ACROSS_TEXT_NODE_DATA_CHANGES &&
        matchesSelectionTextNodes(nodelet, affectedAfterOffset)) {
      needToRestoreSelection = true;
    } else {
      maybeUpdateNodeOffsets(nodelet, affectedAfterOffset, nodelet, insertionAmount);
    }
    return;
  case SPLIT:
    if (matchesSelectionTextNodes(nodelet, affectedAfterOffset)) {
      if (!QuirksConstants.OK_SELECTION_ACROSS_TEXT_NODE_SPLITS) {
        needToRestoreSelection = true;
      } else {
        maybeUpdateNodeOffsets(nodelet, affectedAfterOffset,
            nodelet.getNextSibling().<Text>cast(), -affectedAfterOffset);
      }
    }
    return;
  case REMOVE:
    if (!QuirksConstants.OK_SELECTION_ACROSS_NODE_REMOVALS &&
        matchesSelectionTextNodes(nodelet)) {
      needToRestoreSelection = true;
    }
    return;
  case MOVE:
  case REPLACE_DATA:
    if (matchesSelectionTextNodes(nodelet)) {
      needToRestoreSelection = true;
    }
    return;
  }
}

private void maybeUpdateNodeOffsets(Text nodelet, int affectedAfterOffset,
    Text newNodelet, int offsetDifference) {
  if (nodelet == savedSelectionAnchorTextNodelet &&
      savedSelectionAnchorOffset > affectedAfterOffset) {
    savedSelectionAnchorOffset += offsetDifference;
    savedSelectionAnchorTextNodelet = newNodelet;
  }
  if (nodelet == savedSelectionFocusTextNodelet &&
      savedSelectionFocusOffset > affectedAfterOffset) {
    savedSelectionFocusOffset += offsetDifference;
    savedSelectionFocusTextNodelet = newNodelet;
  }
}

/**
 * Splits this text node at the given offset.
 * If the offset is zero, no split occurs, and the current node is returned.
 * If the offset is equal to or greater than the length of the text node, no split
 * occurs, and null is returned.
 *
 * @see RawDocument#splitText(Object, int)
 */
ContentTextNode splitText(int offset, boolean affectImpl) {
  if (offset == 0) {
    return this;
  } else if (offset >= getLength()) {
    return null;
  }

  Text nodelet = null;

  if (affectImpl) {
    nodelet = implSplitText(offset);
  } else {
    nodelet = Document.get().createTextNode("");
  }

  String first = getData().substring(0, offset);
  String second = getData().substring(offset);

  ContentTextNode sibling = new ContentTextNode(second, nodelet, getExtendedContext());
  setContentData(first);

  // Always false for affecting the impl, as it's already been done
  getParentElement().insertBefore(sibling, getNextSibling(), false);

  return sibling;
}

/**
 * Compacts the multiple impl text nodelets into one
 * @throws HtmlMissing
 */
public void normaliseImplThrow() throws HtmlMissing {
  // TODO(danilatos): Some code in line container depends on the isImplAttached() check,
  // but sometimes it might not be attached but should, and so should throw an exception.
  if (!isContentAttached() || !isImplAttached()) {
    simpleNormaliseImpl();
  }

  Text first = getImplNodelet();
  if (first.getLength() == getLength()) {
    return;
  }

  ContentNode next = checkNodeAndNeighbour(this);
  HtmlView filteredHtml = getFilteredHtmlView();

  //String sum = "";
  Node nextImpl = (next == null) ? null : next.getImplNodelet();
  for (Text nodelet = first; nodelet != nextImpl && nodelet != null;
      nodelet = filteredHtml.getNextSibling(first).cast()) {
    //sum += nodelet.getData();
    if (nodelet != first) {
      getExtendedContext().editing().textNodeletAffected(
          nodelet, -1000, -1000, TextNodeChangeType.REMOVE);
      nodelet.removeFromParent();
    }
  }

  getExtendedContext().editing().textNodeletAffected(
      first, -1000, -1000, TextNodeChangeType.REPLACE_DATA);
  first.setData(getData());
}

/**
 * Helper function to concatenate the character data of a group of
 * adjacent text nodes.
 * Important: Does not do any consistency checking. It assumes this has
 * already been done.
 *
 * @param fromIncl Start from this node, inclusive
 * @param toExcl Go until this node, exclusive
 * @param filteredHtml Html view to use
 * @return the summed impl data
 */
public static String sumTextNodes(Text fromIncl, Node toExcl, HtmlView filteredHtml) {
  // TODO(danilatos): This could potentially be slow if there are many nodelets. In
  // practice this shouldn't be an issue, as we should be normalising them when
  // they get too many.
  String data  = "";
  // TODO(danilatos): Some assumptions about validity here. Could they fail?
  for (Text n = fromIncl; n != toExcl && n != null;
      n = filteredHtml.getNextSibling(n).cast()) {
    data += n.getData();
  }

  return getNodeValueFromHtmlString(data);
}

private static int sumTextNodesLength(Text fromIncl, Node toExcl, HtmlView filteredHtml) {
  int length = 0;
  for (Text n = fromIncl; n != toExcl && n != null;
      n = filteredHtml.getNextSibling(n).cast()) {
    length += n.getLength();
  }

  return length;
}

/**
 * Check whether the given text nodelet is one of the nodelets owned by this
 * wrapper.
 * @param textNodelet
 * @return true if textNodelet is owned by this wrapper
 * @throws HtmlMissing
 */
public boolean owns(Text textNodelet) throws HtmlMissing {
  ContentNode next = checkNodeAndNeighbour(this);
  HtmlView filteredHtml = getFilteredHtmlView();

  Node nextImpl = (next == null) ? null : next.getImplNodelet();
  for (Text nodelet = getImplNodelet(); nodelet != nextImpl;
      nodelet = filteredHtml.getNextSibling(nodelet).cast()) {
    if (nodelet == textNodelet) {
      return true;
    }
  }

  return false;
}

@Override
public void cleanup() {
  if (removeAfter) {
    EditorStaticDeps.logger.trace().log("REVERT CLEANUP: " + (DomHelper.isTextNode(removedNode)
        ? removedNode.<Text>cast().getData() : removedNode.<Element>cast().getTagName()));
    removedNode.removeFromParent();
  }
}

/** Utility for creating tokenizer based on UA. */
private RichTextTokenizer createTokenizer(Element container) {
  if (UserAgent.isFirefox()) {
    return new RichTextTokenizerImplFirefox<Node, Element, Text>(new HtmlViewImpl(container));
  } else {
    return new RichTextTokenizerImpl<Node, Element, Text>(new HtmlViewImpl(container));
  }
}

/**
 * @return The current value of the text in the html, within our tracked range
 */
private String calculateNewValue() {
  HtmlView filteredHtml = filteredHtmlView;
  Text fromIncl = htmlRange.getStartNode(filteredHtml).cast();
  Node toExcl = htmlRange.getPointAfter().getNodeAfter();

  return ContentTextNode.sumTextNodes(fromIncl, toExcl, filteredHtml);
}