/**
* Sets which elements are grayed in this viewer's tree. The given list contains the elements that
* are to be grayed; all other elements are to be ungrayed.
*
* <p>This method is typically used when restoring the interesting state of a viewer captured by
* an earlier call to <code>getGrayedElements</code>.
*
* @param elements the array of grayed elements
* @see #getGrayedElements
*/
public void setGrayedElements(Object[] elements) {
assertElementsNotNull(elements);
CustomHashtable grayedElements = newHashtable(elements.length * 2 + 1);
for (int i = 0; i < elements.length; ++i) {
Object element = elements[i];
// Ensure item exists for element
internalExpand(element, false);
grayedElements.put(element, element);
}
Control tree = getControl();
tree.setRedraw(false);
internalSetGrayed(grayedElements, tree);
tree.setRedraw(true);
}
/**
* Sets the grayed state of all items to correspond to the given set of grayed elements.
*
* @param grayedElements the set (element type: <code>Object</code>) of elements which are grayed
* @param widget the widget
*/
private void internalSetGrayed(CustomHashtable grayedElements, Widget widget) {
Item[] items = getChildren(widget);
for (int i = 0; i < items.length; i++) {
TreeItem item = (TreeItem) items[i];
Object data = item.getData();
if (data != null) {
boolean grayed = grayedElements.containsKey(data);
if (grayed != item.getGrayed()) {
item.setGrayed(grayed);
}
}
internalSetGrayed(grayedElements, item);
}
}
