添加并选择TableView中的ChoiceBox [英] Adding and selecting ChoiceBox that's inside a TableView

问题描述

所以我正在尝试为TableView中插入的每个变量添加一个ChoiceBox。

So I'm trying to add a ChoiceBox for every variable inserted in the TableView.

Users.java：

 Users(String userName , Integer userAge , ChoiceBox employed)
{
    this.userName = userName ;
    this.userAge = userAge ;
    this.employed= employed;
}
//getters and setters

Main.java：

ObservableList<Users>userList = FXCollections.observableArrayList();
TableView<Users> userTable = new TableView();
TableColumn<Users, String> nameCol = new TableColumn();
TableColumn<Users, Integer> ageCol = new TableColumn();

TableColumn<Users, ChoiceBox> employCol = new TableColumn();

private ChoiceBox createBox(){ 
ChoiceBox box = new ChoiceBox();
box.getItems.addAll("true" , "false");
box.setValue("true"); 
return box;
}


userList.addAll(new User("James" , 47 , createBox()));

一切都编译并运行得很好，但我无法获得对<$ c的引用$ c> box 由用户点击。我尝试通过选择模型获取它：

Everything compiles and runs just fine, but I have no way of getting a reference to the box that is clicked by the user. I tried getting it via selection model:

userTable.getSelectionModel().getSelectedItem().employed;

但这只是给我一个NullPointerException。我需要能够选择选项框，如果用户选择true，那么它将显示在文本字段中，但这是一个简单的修复，我实际上无法将实例获取到选择框。我已提到：

but this just gives me a NullPointerException. I need to be able to select the choice box, if the user selects "true" , then it would display in a text field, but that's an easy fix, I'm having trouble actually getting the instance to the choicebox. I've referred to:

从JavaFX TableView获取所选项目

javafx：在编辑期间将ChoiceBox附加到TableColumn上的TableCell

在TableView中使用自定义项目的ChoiceBox

但无济于事。我也试过使用多种变体

But to no avail. I've also tried using multiple variations of

ChoiceBoxTableCell

和

ChoiceBoxTableList

但这些甚至不会编译，我不断收到回调错误。

but these won't even compile, I keep getting a callback error.

推荐答案

Callback<TableColumn<Users, String>, TableCell<Users, String>> cellFactory
            = //
            new Callback<TableColumn<Users, String>, TableCell<Users, String>>() {
        @Override
        public TableCell call(final TableColumn<Users, String> param) {
            final TableCell<Users, String> cell = new TableCell<Users, String>() {

                final ChoiceBox createBox(){ 
ChoiceBox box = new ChoiceBox();
box.getItems.addAll("true" , "false");
box.setValue("true"); 

                @Override
                public void updateItem(String item, boolean empty) {
                    super.updateItem(item, empty);
                    if (empty) {
                        setGraphic(null);
                        setText(null);
                    } else {
                        setGraphic(createBox);
                        setText(null);
                    }
                }
            };
            return cell;
        }
    };

    employCol.setCellFactory(cellFactory);

这篇关于添加并选择TableView中的ChoiceBox的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！