javafx如何禁用checkboxTreeItem中的一项？

Question

I am new to JavaFX and I am having a problem in checkbox Tree View.
I want to disable one item inside root value **Serial No but as per JavaFX documentation, it seems that it is not possible.

I have disabled click effect cbTreeViewdisable(treeItems, 3)
Is there any way to grey out any one value (or set an id) so that user knows it is disabled.

private TreeView<String> cbTreeView;    
@Override
public void start(Stage primaryStage) {
 StackPane root = new StackPane();
 cbTreeView = new TreeView();
 CheckboxTreeItem<String> rootItem = new CheckboxTreeItem("Serial No.");
 final CheckboxTreeItem[] treeItems = new CheckboxTreeItem[6];
 for (int i = 0; i < 6; i++) {
   treeItems[i] = new CheckboxTreeItem(""+i+"");
   rootItem.getChildren().addAll(treeItems[i]);  
 }

 root.setExpanded(true);
 CheckboxTreeItem rootItem2 = new CheckboxTreeItem("child1");
 final CheckboxTreeItem[] treeItems2 = new CheckboxTreeItem[6];

 for (int i = 0; i < 6; i++) {
   treeItems2[i] = new CheckboxTreeItem(""+i+"");
   rootItem2.getChildren().addAll(treeItems2[i]);  
 }

 cbTreeView.setRoot(rootItem);
 cbTreeView.setCellFactory(CheckboxTreeCell.<String>forTreeView());
 rootItem.getChildren().set(2,rootItem2);
 cbTreeViewdisable(treeItems, 3);
 //rest of code imports css and draws stage which is not relevant to my question
 }

 private void cbTreeViewdisable(final CheckboxTreeItem[] treeItems, final int id) {
    treeItems[id].setIndependent(Boolean.TRUE);
    treeItems[id].setValue(treeItems[id].getValue().toString()+" Note: you can't select this!)");
    treeItems[id].selectedProperty().addListener(new ChangeListener<Boolean>() {

    @Override
    public void changed(ObservableValue<? extends Boolean> observable, 
        Boolean oldvalue, Boolean newvalue) {
        Platform.runLater(new Runnable() {
        @Override
        public void run() {
            treeItems[id].setSelected(Boolean.FALSE);       
   } 

Answer 1

我提出了扩展 CheckBoxTreeItem 类的想法。我在那里添加了缺少的禁用属性:

import javafx.beans.property.SimpleBooleanProperty;
import javafx.scene.control.CheckBoxTreeItem;


public class CheckBoxTreeItemExt<T> extends CheckBoxTreeItem<T>
{
    public SimpleBooleanProperty disabledProperty = new SimpleBooleanProperty(false);

    public CheckBoxTreeItemExt(T t)
    {
        super(t);
    }

    public boolean isDisabled()
    {
        return disabledProperty.get();
    }

    public void setDisabled(boolean disabled)
    {
        disabledProperty.set(disabled);
    }
}

然后我创建了一个 CheckBoxTreeCell 来监听新的 disabledProperty:

import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.control.TreeItem;
import javafx.scene.control.cell.CheckBoxTreeCell;


public class CheckBoxTreeCellExt<T> extends CheckBoxTreeCell<T> implements ChangeListener<Boolean>
{
    protected SimpleBooleanProperty linkedDisabledProperty;

    @Override
    public void updateItem(T item, boolean empty)
    {
        super.updateItem(item, empty);

        if(item != null)
        {
            TreeItem<T> treeItem = treeItemProperty().getValue();
            if(treeItem != null)
            {
                if(treeItem instanceof CheckBoxTreeItemExt<?>)
                {
                    CheckBoxTreeItemExt<T> checkItem = (CheckBoxTreeItemExt<T>)treeItem;
                    if(checkItem != null)
                    {                               
                        if(linkedDisabledProperty != null)
                        {
                            linkedDisabledProperty.removeListener(this);
                            linkedDisabledProperty = null;
                        }

                        linkedDisabledProperty = checkItem.disabledProperty;                        
                        linkedDisabledProperty.addListener(this);

                        setDisable(linkedDisabledProperty.get());
                    }
                }
            }           
        }
    }

    @Override
    public void changed(ObservableValue<? extends Boolean> arg0, Boolean oldVal, Boolean newVal)
    {       
        setDisable(newVal);
    }
}

最后我们有了 CheckBoxTreeCellFactory:

import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeView;
import javafx.util.Callback;

public class CheckBoxTreeCellFactoryExt<T> implements Callback<TreeView<T>, TreeCell<T>>
{
    @Override
    public TreeCell<T> call(TreeView<T> tv)
    {
        return new CheckBoxTreeCellExt<T>();
    }
}