org.eclipse.jface.viewers.CheckboxTreeViewer#getChecked ( )源码实例Demo

private static void setChecked(final CheckboxTreeViewer tv, Object element) {
  // When user checks a checkbox in the tree, check all its children and mark parent as greyed
  // When a user uncheck a checkbox, mark the subtree as unchecked and ungrayed and if unique
  // sibling parent as grayed.
  DirectoryTreeContentProvider provider = (DirectoryTreeContentProvider) tv.getContentProvider();

  boolean isChecked = tv.getChecked(element);
  if (tv.getGrayed(element)) {
    isChecked = !isChecked;
  }
  tv.setChecked(element, isChecked);
  tv.setGrayed(element, false);
  if (isChecked) {
    tv.setSubtreeChecked(element, true);
  } else {
    tv.setSubtreeChecked(element, false);
  }
  setGrayed(tv, provider.getParent(element));
}
 

private static void setGrayed(CheckboxTreeViewer tv, Object element) {
  if (element == null) {
    return;
  }
  DirectoryTreeContentProvider provider = (DirectoryTreeContentProvider) tv.getContentProvider();
  boolean checked = tv.getChecked(element);
  boolean grayed = false;
  for (Object object : provider.getChildren(element)) {
    grayed = grayed || tv.getGrayed(object) || tv.getChecked(object);
    checked = checked && tv.getChecked(object) && !tv.getGrayed(element);
  }
  if (checked) {
    tv.setChecked(element, true);
    tv.setGrayed(element, false);
  } else if (grayed) {
    tv.setGrayChecked(element, true);
  } else {
    tv.setChecked(element, false);
    tv.setGrayed(element, false);
  }
  setGrayed(tv, provider.getParent(element));
}
 

private void updateParentState(IResource child, boolean baseChildState) {
	if (mode == MODE_FLAT || child == null || child.getParent() == null || resourceList.contains(child.getParent())) {
		return;
	}
	CheckboxTreeViewer checkboxTreeViewer = (CheckboxTreeViewer)treeViewer;
	if (child == null) return;
	Object parent = resourceSelectionContentProvider.getParent(child);
	if (parent == null) return;
	boolean allSameState = true;
	Object[] children = null;
	children = resourceSelectionContentProvider.getChildren(parent);
	for (int i = children.length - 1; i >= 0; i--) {
		if (checkboxTreeViewer.getChecked(children[i]) != baseChildState || checkboxTreeViewer.getGrayed(children[i])) {
		   allSameState = false;
	       break;
		}
	}
	checkboxTreeViewer.setGrayed(parent, !allSameState);
	checkboxTreeViewer.setChecked(parent, !allSameState || baseChildState);
	updateParentState((IResource)parent, baseChildState);
}