How to use

getTreeItem

method

in

javafx.scene.control.CheckBoxTreeItem$TreeModificationEvent

/***********************************************************************
 *                                                                     *
 * Constructors                                                        *
 *                                                                     *
 **********************************************************************/

CheckTreeViewCheckModel(final CheckTreeView<T> treeView) {
  this.treeView = treeView;
  this.root = treeView.getRoot();
  this.root.addEventHandler(CheckBoxTreeItem.<T>checkBoxSelectionChangedEvent(), e -> {
    CheckBoxTreeItem<T> treeItem = e.getTreeItem();
    
    if (treeItem.isSelected()) { // && ! treeItem.isIndeterminate()) {
      check(treeItem);
    } else { 
      clearCheck(treeItem);
    }
  });
  
  // we should reset the check model and then update the checked items
  // based on the currently checked items in the tree view
  clearChecks();
  for (int i = 0; i < treeView.getExpandedItemCount(); i++) {
    CheckBoxTreeItem<T> treeItem = (CheckBoxTreeItem<T>) treeView.getTreeItem(i);
    if (treeItem.isSelected() && ! treeItem.isIndeterminate()) {
      check(treeItem);
    }
  }
}
 

/**
 * @param root
 *            The "checked" state of all the descendants, including the root
 *            itself, will be monitored
 */
public CheckedTreeItemCollector(CheckBoxTreeItem<T> root) {
  this.root = root;
  root.addEventHandler(TreeModificationEvent.ANY, event -> {
    @SuppressWarnings("unchecked")
    TreeModificationEvent<T> mod = (TreeModificationEvent<T>) event;
    T value = mod.getTreeItem().getValue();
    boolean checked = mod.getTreeItem().isSelected();
    synchronized (this.checkedItems) {
      if (checked && !this.checkedItems.contains(value)) {
        this.checkedItems.add(value);
      } else if (!checked && this.checkedItems.contains(value)) {
        this.checkedItems.remove(value);
      }
    }
  });
  this.checkedItems.addListener((SetChangeListener<T>) change -> {
    if (change.getElementAdded() != null) {
      setCheckedStateForValue(root, change.getElementAdded(), true);
    }
    if (change.getElementRemoved() != null) {
      setCheckedStateForValue(root, change.getElementRemoved(), false);
    }
  });
}

/**
 * @param root
 *            The "checked" state of all the descendants, including the root
 *            itself, will be monitored
 */
public CheckedTreeItemCollector(CheckBoxTreeItem<T> root) {
  this.root = root;
  root.addEventHandler(TreeModificationEvent.ANY, event -> {
    @SuppressWarnings("unchecked")
    TreeModificationEvent<T> mod = (TreeModificationEvent<T>) event;
    T value = mod.getTreeItem().getValue();
    boolean checked = mod.getTreeItem().isSelected();
    synchronized (this.checkedItems) {
      if (checked && !this.checkedItems.contains(value)) {
        this.checkedItems.add(value);
      } else if (!checked && this.checkedItems.contains(value)) {
        this.checkedItems.remove(value);
      }
    }
  });
  this.checkedItems.addListener((SetChangeListener<T>) change -> {
    if (change.getElementAdded() != null) {
      setCheckedStateForValue(root, change.getElementAdded(), true);
    }
    if (change.getElementRemoved() != null) {
      setCheckedStateForValue(root, change.getElementRemoved(), false);
    }
  });
}