java检查TreeView JavaFX中的所有CheckBoxTreeCells

Question

我创建了一个TreeView，其中包含许多CheckBoxTreeCells。我还有一个Button，我想检查所有的CheckBoxTreeCells。我一直在读this tutorial，我有点迷路了。以下是我目前掌握的情况：

按钮代码：

public void fooMethod() {
    /*selectAll is an instance variable*/
    selectAll = new Button("Select All");
    selectAll.setOnMouseClicked(e -> handleSelectAllButtonAction(e));
}

private void handlSelectAllButtonAction(MouseEvent e) {
    /*Code goes here*/
}

TreeView代码：

public void fooMethod2() {
    /*myTreeView is also an insance variable*/
    myTreeView = new TreeView<String>();

    CheckBoxTreeItem<String> root = new CheckBoxTreeItem<>();
    CheckBoxTreeItem<String> branch1 = new CheckBoxTreeItem<>("Branch 1");
    CheckBoxTreeItem<String> branch2 = new CheckBoxTreeItem<>("Branch 2");
    CheckBoxTreeItem<String> branch3 = new CheckBoxTreeItem<>("Branch 3");

    root.getChildren.add(branch1);
    root.getChildren.add(branch2);
    root.getChildren.add(branch3);

    myTreeView.setCellFactory(CheckBoxTreeCell.forTreeView());
    myTreeView.setRoot(root);
    myTreeView.setShowRoot(false);
    myTreeView.setEditable(true);
}

链接中提供的示例比我需要的要复杂一些，我觉得这让我很困惑。如何在树视图中编辑CheckBoxTreeItems

Answer 1

我能找到的最好办法就是：

private void handlSelectAllButtonAction(MouseEvent e) {
    CheckBoxTreeItem<String> root = (CheckBoxTreeItem<String>)myTreeView.getRoot();
    int numBranches = root.getChildren().size();

    for(int i = 0; i < numBranches; i++) {
        if(((CheckBoxTreeItem<String>)root.getChildren().get(i)).isSelected()) {
            ((CheckBoxTreeItem<String>)root.getChildren().get(i)).setSelected(false);
        }
    }
}

Answer 2

除非有独立的CheckBoxTreeItem，否则选择根就足够了：

root.setSelected(true);

因为这会自动选择子对象