如何从 ToggleGroup 中获取选定的单选按钮

Question

我正在研究 JavaFX 8 和 SceneBuilder。我在 FXML 文件中创建了一些单选按钮，并在其中为单选按钮列表指定了一个 toggleGroup 名称。所以，现在我想在我的控制器中获取 toggleGroup 的选定单选按钮，我是否需要再次将所有单选按钮作为控制器中的字段，或者只是 toggleGroup 对象会得到我选定的单选按钮（仅该单选按钮的文本，而不是按钮对象）。

Answer 1

假设您有一个切换组和属于该组的三个单选按钮。

ToggleGroup group = new ToggleGroup();

RadioButton rb1 = new RadioButton("RadioButton1");
rb1.setUserData("RadioButton1");
rb1.setToggleGroup(group);
rb1.setSelected(true);

RadioButton rb2 = new RadioButton("RadioButton2");
rb2.setUserData("RadioButton2");
rb2.setToggleGroup(group);

RadioButton rb3 = new RadioButton("RadioButton3");
rb3.setUserData("RadioButton3");
rb3.setToggleGroup(group);

当您 select 来自该切换组的单选按钮时，将调用以下 changed(...) 方法。

group.selectedToggleProperty().addListener(new ChangeListener<Toggle>(){
    public void changed(ObservableValue<? extends Toggle> ov, Toggle old_toggle, Toggle new_toggle) {

         if (group.getSelectedToggle() != null) {

             System.out.println(group.getSelectedToggle().getUserData().toString());
             // Do something here with the userData of newly selected radioButton

         }

     } 
});

Answer 2

这从来没有得到正确或彻底的回答，所以我想我会 post 我得到的解决方案。

当您在 SceneBuilder 中创建单选按钮时，还可以使用 SceneBuilder 将它们分配给一个组。通过 Controller 访问该组的方法是首先在 Controller 中创建一个 ToggleGroup 类型的变量，并将其命名为与您在 SceneBuilder 中创建的变量完全相同的名称。然后你就可以使用它了。这是我如何做到的伪代码示例：

// your imports
public class Controller
{
    @FXML ToggleGroup   myGroup; //I called it myGroup in SceneBuilder as well.

    public void myGroupAction(ActionEvent action)
    {
      System.out.println("Toggled: " + myGroup.getSelectedToggle().getUserData().toString());
    }

    public void initialize()
    {
      //whatever initialize code you have here
    }
}

尽管从 getUserData 属性返回的文本很长。下面是获取单选按钮名称的方法：

myGroup.selectedToggleProperty().addListener(new ChangeListener<Toggle>()
    {
    @Override
    public void changed(ObservableValue<? extends Toggle> ov, Toggle t, Toggle t1)
        {
        RadioButton chk = (RadioButton)t1.getToggleGroup().getSelectedToggle(); // Cast object to radio button
        System.out.println("Selected Radio Button - "+chk.getText());
        }
    });

希望这对以后的人有所帮助...

Answer 3

 @FXML
 ToggleGroup right; //I called it right in SceneBuilder.

稍后在方法中的某个地方。

RadioButton selectedRadioButton = (RadioButton) right.getSelectedToggle();
String toogleGroupValue = selectedRadioButton.getText();

Answer 4

public class MyControler {
    @FXML
    private ToggleGroup myToggleGroup;

    @FXML
    public void initialize(){
        //the simplest way to print current value (text of the selected radio button)
        System.out.format("Selected Radio Button: " + ((RadioButton)myToggleGroup.getSelectedToggle()).getText());

        //register on change event
        myToggleGroup.selectedToggleProperty().addListener(new ChangeListener<Toggle>()
        {
            @Override
            public void changed(ObservableValue<? extends Toggle> observable, Toggle oldToggle, Toggle newToggle)
            {
                //print new selected value after change
                System.out.println("Selected Radio Button: " + ((RadioButton)newToggle).getText());
            }
        });
    }

    //sample method to set radio button (unselect all if group don't contain value)
    private void setRadioButtons(ToggleGroup toggleGroup, String value) {
        for (Toggle t : toggleGroup.getToggles()) 
            t.setSelected(((RadioButton) t).getText().equals(value));
    }

    //sample method to set radio button (select existing value or do nothing)
    private void setRadioButton(ToggleGroup toggleGroup, String value) {
        for (Toggle t : toggleGroup.getToggles()) 
            if(((RadioButton) t).getText().equals(value)) 
                t.setSelected(true);
    }
}

Answer 5

我得到的解决方案是：

ToggleGroup toggleGroup = new ToggleGroup();

然后将toggleGroup设置为单选按钮；假设 r1 和 r2

r1.setToggleGroup(toggleGroup);

r2.setToggleGroup(toggleGroup);

toggleGroup.setUserData(toggleGroup.getSelectedToggle().toString());

打印RadioButton的数据：

System.out.println("Selected Radio Button is " + toggleGroup.getUserData().toString());

如何从 ToggleGroup 中获取选定的单选按钮

How to get selected radio button from ToggleGroup

javafx

fxml