How to use

getGrayed

method

in

org.eclipse.jface.viewers.CheckboxTreeViewer

/**
 * Checks if an element is grey checked.
 */
public boolean isTreeItemGreyChecked(Object object) {
  return fTreeViewer.getGrayed(object);	
}    

/**
 * Checks if an element is grey checked.
 * @param object
 * @return if an element is grey checked.
 */
public boolean isTreeItemGreyChecked(Object object) {
  return fTreeViewer.getGrayed(object);
}

/**
 * Checks if an element is grey checked.
 * @param object
 * @return if an element is grey checked.
 */
public boolean isTreeItemGreyChecked(Object object) {
  return fTreeViewer.getGrayed(object);
}

/**
 * Checks if an element is grey checked.
 */
public boolean isTreeItemGreyChecked(Object object) {
  return fTreeViewer.getGrayed(object);	
}    

/**
 * Returns whether all items in the list are checked.
 * This method is required, because this widget will keep items grey
 * checked even though all children are selected (see grayUpdateHierarchy()).
 * @return true if all items in the list are checked - false if not
 */
public boolean isEveryItemChecked() {
  //Iterate through the children of the root as the root is not in the store
  Object[] children = treeContentProvider.getChildren(root);
  for (int i = 0; i < children.length; ++i) {
    if (!whiteCheckedTreeItems.contains(children[i])) {
      if (!treeViewer.getGrayed(children[i]))
        return false;
      if (!isEveryChildrenChecked(children[i]))
        return false;
    }
  }
  return true;
}

private void findCheckedElements(java.util.List checkedResources,
    Object parent) {
  Object[] children = treeContentProvider.getChildren(parent);
  for (int i = 0; i < children.length; i++) {
    if (tree.getGrayed(children[i]))
      findCheckedElements(checkedResources, children[i]);
    else if (tree.getChecked(children[i]))
      checkedResources.add(children[i]);
  }
}

  public void treeExpanded(TreeExpansionEvent event) {
    final Object element= event.getElement();
    if (fTree.getGrayed(element) == false)
      BusyIndicator.showWhile(getShell().getDisplay(), new Runnable() {
      public void run() {
        setSubtreeChecked(element, fTree.getChecked(element), false);
      }
    });
  }
});

private void findCheckedElements(List checkedResources, Object parent) {
  Object[] children= fTreeContentProvider.getChildren(parent);
  for (int i= 0; i < children.length; i++) {
    if (fTree.getGrayed(children[i]))
      findCheckedElements(checkedResources, children[i]);
    else if (fTree.getChecked(children[i]))
      checkedResources.add(children[i]);
  }
}

  public void treeExpanded(TreeExpansionEvent event) {
    final Object element = event.getElement();
    if (tree.getGrayed(element) == false)
      BusyIndicator.showWhile(getShell().getDisplay(),
          new Runnable() {
            public void run() {
              setSubtreeChecked(element, tree
                  .getChecked(element), false);
            }
          });
  }
});

private void findCheckedElements(java.util.List checkedResources,
    Object parent) {
  Object[] children = treeContentProvider.getChildren(parent);
  for (int i = 0; i < children.length; i++) {
    if (tree.getGrayed(children[i]))
      findCheckedElements(checkedResources, children[i]);
    else if (tree.getChecked(children[i]))
      checkedResources.add(children[i]);
  }
}

  public void treeExpanded(TreeExpansionEvent event) {
    final Object element = event.getElement();
    if (tree.getGrayed(element) == false)
      BusyIndicator.showWhile(getShell().getDisplay(),
          new Runnable() {
            public void run() {
              setSubtreeChecked(element, tree
                  .getChecked(element), false);
            }
          });
  }
});

/**Verifies of all list items of the tree element are checked, and
 * if all children are white checked.  If not, verify their children
 * so that if an element is not white checked, but all its children
 * are while checked, then, all items are considered checked.
 * @param treeElement the treeElement which status to verify
 * @return true if all items are checked, false otherwise.
 */
private boolean isEveryChildrenChecked(Object treeElement) {
  List checked = (List) checkedStateStore.get(treeElement);
  if (checked != null && (!checked.isEmpty())) {
    Object[] listItems = listContentProvider.getElements(treeElement);
    if (listItems.length != checked.size())
      return false;
  }
  Object[] children = treeContentProvider.getChildren(treeElement);
  for (int i = 0; i < children.length; ++i) {
    if (!whiteCheckedTreeItems.contains(children[i])) {
      if (!treeViewer.getGrayed(children[i]))
        return false;
      if (!isEveryChildrenChecked(children[i]))
        return false;
    }
  }
  return true;
}

/**
 * Get the selected IU's
 * @return the array of checked IU's
 */
public IInstallableUnit[] getCheckedLeafIUs() {
  Object[] selections = filteredTree.getCheckedElements(); // Get all the elements that have been selected, not just the visible ones
  if (selections.length == 0)
    return new IInstallableUnit[0];
  ArrayList<IInstallableUnit> leaves = new ArrayList<IInstallableUnit>(selections.length);
  for (int i = 0; i < selections.length; i++) {
    if (!getCheckboxTreeViewer().getGrayed(selections[i])) {
      IInstallableUnit iu = ProvUI.getAdapter(selections[i], IInstallableUnit.class);
      if (iu != null && !ProvUI.isCategory(iu) && !leaves.contains(iu))
        leaves.add(iu);
    }
  }
  return leaves.toArray(new IInstallableUnit[leaves.size()]);
}

/**
 * Update activity enablement based on the check states of activities in the
 * tree.
 */
public void updateActivityStates() {
  Set<String> enabledActivities = new HashSet<>(activitySupport.getEnabledActivityIds());
  // remove all but the unmanaged activities (if any).
  enabledActivities.removeAll(managedActivities);
  for (Object element : dualViewer.getCheckedElements()) {
    if (element instanceof ICategory || dualViewer.getGrayed(element)) {
      continue;
    }
    enabledActivities.add(((IActivity) element).getId());
  }
  activitySupport.setEnabledActivityIds(enabledActivities);
}

  @Override
  public void treeExpanded(TreeExpansionEvent event) {
    final Object element = event.getElement();
    if (tree.getGrayed(element) == false) {
      BusyIndicator.showWhile(getShell().getDisplay(),
          () -> setSubtreeChecked((IContainer) element,
              tree.getChecked(element), false));
    }
  }
});

private void updateObjectState(Object element, boolean baseChildState) {		
  boolean allSameState= true;
  Object[] children= fTreeContentProvider.getChildren(element);
  for (int i= children.length -1; i >= 0; i--) {
    if (fTree.getChecked(children[i]) != baseChildState || fTree.getGrayed(children[i])) {
      allSameState= false;
      break;
    }
  }

  fTree.setGrayed(element, !allSameState);
  fTree.setChecked(element, !allSameState || baseChildState);
  
  updateParentState(element, baseChildState);
}

  @Override
  public void move(Object parent, Object element, int oldPosition,
      int newPosition) {
    if (isElementOrderPreserved()) {
      boolean wasChecked = checkboxViewer.getChecked(element);
      boolean wasGrayed = checkboxViewer.getGrayed(element);
      super.move(parent, element, oldPosition, newPosition);
      checkboxViewer.setChecked(element, wasChecked);
      checkboxViewer.setGrayed(element, wasGrayed);
    }
  }
}

void updateParentState(Object child, boolean baseChildState) {
  if (child == null)
    return;
  Object parent = treeContentProvider.getParent(child);
  if (parent == null)
    return;
  boolean allSameState = true;
  Object[] children = null;
  children = treeContentProvider.getChildren(parent);
  for (int i = children.length - 1; i >= 0; i--) {
    if (tree.getChecked(children[i]) != baseChildState
        || tree.getGrayed(children[i])) {
      allSameState = false;
      break;
    }
  }
  tree.setGrayed(parent, !allSameState);
  tree.setChecked(parent, !allSameState || baseChildState);
  updateParentState(parent, baseChildState);
}

void updateParentState(Object child, boolean baseChildState) {
  if (child == null)
    return;
  Object parent = treeContentProvider.getParent(child);
  if (parent == null)
    return;
  boolean allSameState = true;
  Object[] children = null;
  children = treeContentProvider.getChildren(parent);
  for (int i = children.length - 1; i >= 0; i--) {
    if (tree.getChecked(children[i]) != baseChildState
        || tree.getGrayed(children[i])) {
      allSameState = false;
      break;
    }
  }
  tree.setGrayed(parent, !allSameState);
  tree.setChecked(parent, !allSameState || baseChildState);
  updateParentState(parent, baseChildState);
}

if (tree.getChecked(members[i]) || tree.getGrayed(members[i])) {
  childChecked = true;
  break;