Java Code Examples for com.google.gwt.dom.client.Node#getNextSibling()

/**
 * Ensures the given container contains exactly one child, the given one.
 * Provides the important property that if the container is already the parent
 * of the given child, then the child is not removed and re-added, it is left
 * there; any siblings, if present, are removed.
 *
 * @param container
 * @param child
 */
public static void setOnlyChild(Element container, Node child) {
  if (child.getParentElement() != container) {
    // simple case
    emptyElement(container);
    container.appendChild(child);
  } else {
    // tricky case - avoid removing then re-appending the same child
    while (child.getNextSibling() != null) {
      child.getNextSibling().removeFromParent();
    }
    while (child.getPreviousSibling() != null) {
      child.getPreviousSibling().removeFromParent();
    }
  }
}
 

/**
 * Ensures the given container contains exactly one child, the given one.
 * Provides the important property that if the container is already the parent
 * of the given child, then the child is not removed and re-added, it is left
 * there; any siblings, if present, are removed.
 *
 * @param container
 * @param child
 */
public static void setOnlyChild(Element container, Node child) {
  if (child.getParentElement() != container) {
    // simple case
    emptyElement(container);
    container.appendChild(child);
  } else {
    // tricky case - avoid removing then re-appending the same child
    while (child.getNextSibling() != null) {
      child.getNextSibling().removeFromParent();
    }
    while (child.getPreviousSibling() != null) {
      child.getPreviousSibling().removeFromParent();
    }
  }
}
 

@SuppressWarnings("unused") // NOTE(user): may be used later
private Point<Node> linearSearchForRange(JsTextRangeIE target, Element parent) {
  try {
    // We'll iterate through the parent's children while moving
    // a new collapsed range, attempt, through the points before
    // each child.
    Node child = parent.getFirstChild();
    // Start attempt at beginning of parent
    JsTextRangeIE attempt = JsTextRangeIE.create().moveToElementText(parent).collapse(true);
    while (child != null) {
      // Treat text node children separately
      if (DomHelper.isTextNode(child)) {
        // Move attempt to end of the text node
        int len = child.<Text> cast().getLength();
        attempt.move(character, len);
        // Test if attempt is now at or past target
        if (attempt.compareEndPoints(StartToStart, target) >= 0) {
          // Target is in this text node. Compute the offset by creating a new
          // text range from target to attempt and measuring the length of the
          // text in that range
          JsTextRangeIE dup =
              attempt.duplicate().setEndPoint(StartToStart, target)
                  .setEndPoint(EndToEnd, attempt);
          return Point.inText(child, len - dup.getText().length());
        }
      } else {
        // Child is an element. Move attempt before child, and test
        // if attempt is at or past range
        attempt.moveToElementText(child.<Element> cast()).collapse(true);
        if (attempt.compareEndPoints(StartToStart, target) >= 0) {
          // Return the point before child
          return Point.inElement(parent, child);
        } else {
          // Move attempt past child
          // We use our inline, non-empty marker element to do this.
          // We also leave it in the dom for max reliability until it's needed
          // later, or gets taken out in the finally clause at the end of this method
          child.getParentNode().insertAfter(setter, child);
          // skip pass the setter.
          child = child.getNextSibling();

          attempt.moveToElementText(setter).collapse(false);
        }
      }
      // Move to next child
      child = child.getNextSibling();
    }

    // We didn't find target before or in children; return point at end of
    // parent
    return Point.<Node> end(parent);
    // TODO(user): look out for other corner cases
    // TODO(user, danilatos): implement danilatos' optimisation of first
    // checking inside the last text node that held a point.
    // TODO(user): consider binary rather than linear search for target
    // TODO(user): does this handle the end of a <p>ab[</p><p>]cd</p> type
    // selection?
    // TODO(danilatos): When someone selects the "newline" at the edge
    // of a <p>, e.g. <p>abc[</p><p>]def</p> (where [ ] is the sel)
    // this reports the selection still as <p>abc[]</p><p>def</p>
    // It appears to be a detectable scenario when the first line
    // is not empty, but it isn't when both lines are empty. However,
    // I did notice a difference before when I was experimenting with
    // getBookmark(), so perhaps we could resort to tricks with checking
    // bookmarks around paragraph boundaries...
    // TODO(user, danilatos): consider making attempt and other ranges
    // used here static singletons
  } finally {
    setter.removeFromParent();
  }
}
 

/**
 * @param n Node to pretty print
 * @param selection Selection to mark in pretty print
 * @param indent Indentation level to print with.
 * @param multiLine True if output should be multi-line
 * @return A pretty-print HTML string (with '<' and '>' already escaped)
 */
private static String print(Node n, PointRange<Node> selection, int indent, boolean multiLine) {

  // Inspect selection's relevance to this element
  boolean collapsed = selection != null && selection.isCollapsed();
  boolean printStartMarker =
      selection != null && selection.getFirst().getContainer().equals(n);
  boolean printEndMarker =
      selection != null && !collapsed && selection.getSecond().getContainer().equals(n);
  String startMarker =
      printStartMarker ? (collapsed ? "|" : "[") : "";
  String endMarker = printEndMarker ? "]" : "";
  if (DomHelper.isTextNode(n)) {
    // Print text node as 'value'
    String value = displayWhitespace(n.getNodeValue());
    int startOffset = printStartMarker ? selection.getFirst().getTextOffset() : 0;
    int endOffset = printEndMarker ? selection.getSecond().getTextOffset() : value.length();
    String ret = "'" + value.substring(0, startOffset)
        + startMarker
        + value.substring(startOffset, endOffset)
        + endMarker
        + value.substring(endOffset, value.length())
        + "'" ;
    return multiLine ? StringUtil.xmlEscape(ret) : ret;
  } else {
    Element e = n.cast();
    if (e.getChildCount() == 0) {
      // Print child-less element as self-closing tag
      return startTag(e, true, multiLine);
    } else {
      boolean singleLineHtml = multiLine &&
        (e.getChildCount() == 1 &&
          e.getFirstChild()
          .getChildCount() == 0);
      // Print element w/ children. One line each for start tag, child, end tag
      String pretty = startTag(e, false, multiLine);
      Node child = e.getFirstChild();
      Node startNodeAfter = selection.getFirst().getNodeAfter();
      Node endNodeAfter = selection.getSecond().getNodeAfter();
      while (child != null) {
        pretty += (multiLine && !singleLineHtml ? newLine(indent + 1) : "")
          + (printStartMarker && child.equals(startNodeAfter) ? startMarker : "")
          + (printEndMarker && child.equals(endNodeAfter) ? endMarker : "")
          + print(child, selection, indent + 1, multiLine);
        child = child.getNextSibling();
      }
      if (printEndMarker && endNodeAfter == null) {
        pretty += endMarker;
      }
      return pretty + (multiLine  && !singleLineHtml ? newLine(indent) : "")
          + endTag(e, multiLine);
    }
  }
}
 

/** {@inheritDoc} */
public Node getNextSibling(Node node) {
  return node.getNextSibling();
}
 

@SuppressWarnings("unused") // NOTE(user): may be used later
private Point<Node> linearSearchForRange(JsTextRangeIE target, Element parent) {
  try {
    // We'll iterate through the parent's children while moving
    // a new collapsed range, attempt, through the points before
    // each child.
    Node child = parent.getFirstChild();
    // Start attempt at beginning of parent
    JsTextRangeIE attempt = JsTextRangeIE.create().moveToElementText(parent).collapse(true);
    while (child != null) {
      // Treat text node children separately
      if (DomHelper.isTextNode(child)) {
        // Move attempt to end of the text node
        int len = child.<Text> cast().getLength();
        attempt.move(character, len);
        // Test if attempt is now at or past target
        if (attempt.compareEndPoints(StartToStart, target) >= 0) {
          // Target is in this text node. Compute the offset by creating a new
          // text range from target to attempt and measuring the length of the
          // text in that range
          JsTextRangeIE dup =
              attempt.duplicate().setEndPoint(StartToStart, target)
                  .setEndPoint(EndToEnd, attempt);
          return Point.inText(child, len - dup.getText().length());
        }
      } else {
        // Child is an element. Move attempt before child, and test
        // if attempt is at or past range
        attempt.moveToElementText(child.<Element> cast()).collapse(true);
        if (attempt.compareEndPoints(StartToStart, target) >= 0) {
          // Return the point before child
          return Point.inElement(parent, child);
        } else {
          // Move attempt past child
          // We use our inline, non-empty marker element to do this.
          // We also leave it in the dom for max reliability until it's needed
          // later, or gets taken out in the finally clause at the end of this method
          child.getParentNode().insertAfter(setter, child);
          // skip pass the setter.
          child = child.getNextSibling();

          attempt.moveToElementText(setter).collapse(false);
        }
      }
      // Move to next child
      child = child.getNextSibling();
    }

    // We didn't find target before or in children; return point at end of
    // parent
    return Point.<Node> end(parent);
    // TODO(user): look out for other corner cases
    // TODO(user, danilatos): implement danilatos' optimisation of first
    // checking inside the last text node that held a point.
    // TODO(user): consider binary rather than linear search for target
    // TODO(user): does this handle the end of a <p>ab[</p><p>]cd</p> type
    // selection?
    // TODO(danilatos): When someone selects the "newline" at the edge
    // of a <p>, e.g. <p>abc[</p><p>]def</p> (where [ ] is the sel)
    // this reports the selection still as <p>abc[]</p><p>def</p>
    // It appears to be a detectable scenario when the first line
    // is not empty, but it isn't when both lines are empty. However,
    // I did notice a difference before when I was experimenting with
    // getBookmark(), so perhaps we could resort to tricks with checking
    // bookmarks around paragraph boundaries...
    // TODO(user, danilatos): consider making attempt and other ranges
    // used here static singletons
  } finally {
    setter.removeFromParent();
  }
}
 

/**
 * @param n Node to pretty print
 * @param selection Selection to mark in pretty print
 * @param indent Indentation level to print with.
 * @param multiLine True if output should be multi-line
 * @return A pretty-print HTML string (with '<' and '>' already escaped)
 */
private static String print(Node n, PointRange<Node> selection, int indent, boolean multiLine) {

  // Inspect selection's relevance to this element
  boolean collapsed = selection != null && selection.isCollapsed();
  boolean printStartMarker =
      selection != null && selection.getFirst().getContainer().equals(n);
  boolean printEndMarker =
      selection != null && !collapsed && selection.getSecond().getContainer().equals(n);
  String startMarker =
      printStartMarker ? (collapsed ? "|" : "[") : "";
  String endMarker = printEndMarker ? "]" : "";
  if (DomHelper.isTextNode(n)) {
    // Print text node as 'value'
    String value = displayWhitespace(n.getNodeValue());
    int startOffset = printStartMarker ? selection.getFirst().getTextOffset() : 0;
    int endOffset = printEndMarker ? selection.getSecond().getTextOffset() : value.length();
    String ret = "'" + value.substring(0, startOffset)
        + startMarker
        + value.substring(startOffset, endOffset)
        + endMarker
        + value.substring(endOffset, value.length())
        + "'" ;
    return multiLine ? StringUtil.xmlEscape(ret) : ret;
  } else {
    Element e = n.cast();
    if (e.getChildCount() == 0) {
      // Print child-less element as self-closing tag
      return startTag(e, true, multiLine);
    } else {
      boolean singleLineHtml = multiLine &&
        (e.getChildCount() == 1 &&
          e.getFirstChild()
          .getChildCount() == 0);
      // Print element w/ children. One line each for start tag, child, end tag
      String pretty = startTag(e, false, multiLine);
      Node child = e.getFirstChild();
      Node startNodeAfter = selection.getFirst().getNodeAfter();
      Node endNodeAfter = selection.getSecond().getNodeAfter();
      while (child != null) {
        pretty += (multiLine && !singleLineHtml ? newLine(indent + 1) : "")
          + (printStartMarker && child.equals(startNodeAfter) ? startMarker : "")
          + (printEndMarker && child.equals(endNodeAfter) ? endMarker : "")
          + print(child, selection, indent + 1, multiLine);
        child = child.getNextSibling();
      }
      if (printEndMarker && endNodeAfter == null) {
        pretty += endMarker;
      }
      return pretty + (multiLine  && !singleLineHtml ? newLine(indent) : "")
          + endTag(e, multiLine);
    }
  }
}
 

/** {@inheritDoc} */
public Node getNextSibling(Node node) {
  return node.getNextSibling();
}