How to use

getAbsoluteTop

method

in

com.google.gwt.user.client.Element

/**
 * Gets the popup's top position relative to the browser's client area.
 *
 * @return the popup's top position
 */
public int getPopupTop() {
 return getElement().getAbsoluteTop();
}

/**
 * Gets the object's absolute top position in pixels, as measured from the
 * browser window's client area.
 * 
 * @return the object's absolute top position
 */
public int getAbsoluteTop() {
 return getElement().getAbsoluteTop();
}

/**
 * Gets the position of the top outer border edge of the widget relative to
 * the top outer border edge of the panel.
 * 
 * @param w the widget whose position is to be retrieved
 * @return the widget's top position
 */
public int getWidgetTop(Widget w) {
 checkWidgetParent(w);
 return w.getElement().getAbsoluteTop()
   - getElement().getAbsoluteTop();
}

/**
 * Gets the current Y position of the element based on page coordinates.
 * 
 * @return the y position of the element
 */
public int getY() {
 return dom.getAbsoluteTop();
}

/**
 * Gets the popup's top position relative to the browser's client area.
 *
 * @return the popup's top position
 */
public int getPopupTop() {
 return getElement().getAbsoluteTop();
}

/**
 * Gets the object's absolute top position in pixels, as measured from the
 * browser window's client area.
 * 
 * @return the object's absolute top position
 */
public int getAbsoluteTop() {
 return getElement().getAbsoluteTop();
}

/**
 * Gets the popup's top position relative to the browser's client area.
 *
 * @return the popup's top position
 */
public int getPopupTop() {
 return getElement().getAbsoluteTop();
}

/**
 * Gets the object's absolute top position in pixels, as measured from the
 * browser window's client area.
 * 
 * @return the object's absolute top position
 */
public int getAbsoluteTop() {
 return getElement().getAbsoluteTop();
}

public float getAbsoluteY() {
  return this.getElement().getAbsoluteTop();
}

/**
 * Gets the position of the top outer border edge of the widget relative to
 * the top outer border edge of the panel.
 * 
 * @param w the widget whose position is to be retrieved
 * @return the widget's top position
 */
public int getWidgetTop(Widget w) {
 checkWidgetParent(w);
 return w.getElement().getAbsoluteTop()
   - getElement().getAbsoluteTop();
}

/**
 * Gets the position of the top outer border edge of the widget relative to
 * the top outer border edge of the panel.
 * 
 * @param w the widget whose position is to be retrieved
 * @return the widget's top position
 */
public int getWidgetTop(Widget w) {
 checkWidgetParent(w);
 return w.getElement().getAbsoluteTop()
   - getElement().getAbsoluteTop();
}

/***************************************
 * Get the offset for the vertical scroll
 *
 * @return The offset
 */
private int getPageScrollTop()
{
  Element rBodyElement = RootPanel.getBodyElement();
  return DOM.getParent(rBodyElement).getAbsoluteTop();
}

public int getTableAbsoluteTop() {
  return this.table.getElement().getAbsoluteTop() + this.table.getGridHeaderHeight();
}

protected void calculateSelection(int y) {
  int absoluteTop = getElement().getAbsoluteTop();
  int absoluteBottom = getElement().getAbsoluteBottom();
  int normalized_y = y - absoluteTop;
  int height = absoluteBottom - absoluteTop;
  int index = (normalized_y * renderedEntries) / height;
  if (index != selectedIndex) {
    SelectionEvent.fire(this, mapping.get(index));
  }
  selectedIndex = index;
}

protected void calculateSelection(int y) {
  int absoluteTop = getElement().getAbsoluteTop();
  int absoluteBottom = getElement().getAbsoluteBottom();
  int normalized_y = y - absoluteTop;
  int height = absoluteBottom - absoluteTop;
  int index = (normalized_y * renderedEntries) / height;
  if (index != selectedIndex) {
    SelectionEvent.fire(this, mapping.get(index));
  }
  selectedIndex = index;
}

 public static boolean isVisible(Element e)
{
  //vp = viewPort, b = bottom, l = left, t = top, r = right
  int vpWidth   = Window.getClientWidth();
  int vpHeight = Window.getClientHeight();


  boolean tViz = ( e.getAbsoluteTop() >= 0 && e.getAbsoluteTop()<  vpHeight);
  boolean bViz = (e.getAbsoluteBottom() >  0 && e.getAbsoluteBottom() <= vpHeight);
  boolean lViz = (e.getAbsoluteLeft() >= 0 && e.getAbsoluteLeft() < vpWidth);
  boolean rViz = (e.getAbsoluteRight()  >  0 && e.getAbsoluteRight()  <= vpWidth);

  boolean vVisible   = tViz && bViz;
  boolean hVisible   = lViz && rViz;

  return hVisible && vVisible;
}

private void showOptionsMenu(MapLayer mapLayer, int index) {
  if (layerMenu == null) {
    createLayerMenu();
  }
  int x = this.getAbsoluteLeft() - CONTEXT_MENU_WIDTH;
  int y = view.getElement(index).getAbsoluteTop();
  clusterMenuItem.setVisible(mapLayer instanceof PointMapLayer);
  layerMenu.showAt(x, y);
}

/**
 * Gets the mouse y-position relative to the canvas element.
 * @param clientY The event's clienty value.
 * @return the relative y-position
 */
private double getRelativeY(final double clientY) {
  return clientY - getCanvasElement().getAbsoluteTop() + getCanvasElement().getScrollTop() +
      getCanvasElement().getOwnerDocument().getScrollTop();
}

 private boolean isInViewPort() {
  final int pageTop = Window.getScrollTop();
  final int pageBottom = pageTop + Window.getClientHeight();
  final int elementTop = asWidget().getElement().getAbsoluteTop();
  final int elementBottom = elementTop + asWidget().getElement().getClientHeight();
  return elementTop <= pageBottom && elementBottom >= pageTop;
 }
}

private void beginMovingWindow(Event event) {
  if (draggable) {
    showDraggingCurtain();
    dragging = true;
    startX = WidgetUtil.getTouchOrMouseClientX(event);
    startY = WidgetUtil.getTouchOrMouseClientY(event);
    origX = getElement().getAbsoluteLeft();
    origY = getElement().getAbsoluteTop();
    DOM.setCapture(getElement());
    event.preventDefault();
  }
}