JavaFX | ToggleButton 类
ToggleButton 是一个特殊的控件，具有被选择的能力。基本上，ToggleButton 的呈现方式类似于 Button，但这两种是不同类型的控件。按钮是一个“命令”按钮，单击时会调用一个函数。但是 ToggleButton 是一个带有布尔值的控件，指示它是否被选中。它继承了按钮库类。
ToggleButton 也可以分组放置。默认情况下，ToggleButton 不在一个组中。分组时，在该组中一次只能选择一个切换按钮。要将两个 ToggleButtons 放在同一个组中，只需为 ToggleGroup 分配相同的值。与单选按钮不同，切换组中的切换按钮不会强制组中至少一个选定的切换按钮。意味着，如果选择了一个切换按钮，单击它将导致它被取消选择。使用单选按钮，单击组中选定的按钮将不起作用。
类的构造函数:
- 切换按钮():创建标签为空字符串的切换按钮。
- 切换按钮(String txt) :创建一个以指定文本为标签的切换按钮。
- 切换按钮(字符串 txt，节点图形):创建一个切换按钮，其标签具有指定的文本和图标。
常用方法:
| 方法 | 描述 |
|---|---|
| 设置组值 | 将属性的值设置为 Group。 |
| 设置选定(布尔值) | 设置选定属性的值。 |
| isSelected() | 获取选定属性的值。 |
| 火灾() | 当用户手势指示应该发生此按钮库的事件时调用。 |
下面的程序说明了 ToggleButton 类的使用:
-
Simple Java program to demonstrate ToggleButton Class: In this program we are trying to select the gender of a person. We first Create HBox and then set the Layout for it. Create a ToggleGroup and new Toggle Buttons named”Male” and “Female“. Set the Toggle Group (in a group only one button can be selected at a time) using setToggleGroup() method. By default Male button is selected. Create the scene and set scene to the stage using setScene() method. And launch the application.
```java // Java program to demonstrate ToggleButton Class import javafx.application.Application; import javafx.geometry.Insets; import javafx.scene.Scene; import javafx.scene.control.Label; import javafx.scene.control.ToggleButton; import javafx.scene.control.ToggleGroup; import javafx.scene.layout.HBox; import javafx.stage.Stage;
public class ToggleButtonExample extends Application {
public void start(Stage stage) {
// Hbox layout HBox root = new HBox(); root.setPadding(new Insets(10)); root.setSpacing(5);
// Gender root.getChildren().add(new Label("Your gender:"));
// Creating a ToggleGroup ToggleGroup group = new ToggleGroup();
// Creating new Toggle buttons. ToggleButton maleButton = new ToggleButton("Male"); ToggleButton femaleButton = new ToggleButton("Female");
// Set toggle group // In a group, maximum only // one button is selected maleButton.setToggleGroup(group); femaleButton.setToggleGroup(group);
maleButton.setUserData("I am a Male"); femaleButton.setUserData("I am a Female");
// male button is selected at first by default maleButton.setSelected(true);
root.getChildren().addAll(maleButton, femaleButton);
// create the scene Scene scene = new Scene(root, 450, 300);
stage.setTitle("Toggle Button"); stage.setScene(scene); stage.show(); }
// Main Method public static void main(String[] args) { launch(args); } } ```
输出:
https://media.geeksforgeeks.org/wp-content/uploads/20180825_200037.mp4 2. Java program to demonstrate ToggleButton Class using ChangeListener: In this program, we first create a label. Then we will create Toggle Buttons using ToggleButton() and Toggle Group is created using ToggleGroup() method. Add all the Toggle Buttons to the ToggleGroup. Now create a ChangeListener for the ToggleGroup. A ChangeListener is notified whenever the value of an ObservableValue change. An ObservableValue is an entity that wraps a value and allows to observe the value for changes. Now, create the label for the selection of the subjects. Create a HBox using HBox() Now, add ToggleButtons to an HBox. Set the spacing between the buttons using setSpacing() method. Create the VBox, add labels and HBox to the VBox. Set the size of the VBox and set padding of the VBox (e.g border-style, border-width, border-radius, border-insets, border-color). Create the scene and add it to the stage. Set the title of the stage and display.
```java // Java program to demonstrate ToggleButton // Class using ChangeListener import javafx.application.Application; import javafx.beans.value.ChangeListener; import javafx.beans.value.ObservableValue; import javafx.scene.Scene; import javafx.scene.control.Label; import javafx.scene.control.Toggle; import javafx.scene.control.ToggleButton; import javafx.scene.control.ToggleGroup; import javafx.scene.layout.HBox; import javafx.scene.layout.VBox; import javafx.stage.Stage;
public class ToggleButtonDemo extends Application {
// Create the Message Label Label selectionMsg = new Label("Your selection: None");
public void start(Stage stage) {
// Create four ToggleButtons ToggleButton csBtn = new ToggleButton("Computer Science"); ToggleButton pBtn = new ToggleButton("Physics"); ToggleButton chemBtn = new ToggleButton("Chemistry"); ToggleButton mBtn = new ToggleButton("Maths");
// Create a ToggleGroup final ToggleGroup group = new ToggleGroup();
// Add all ToggleButtons to a ToggleGroup group.getToggles().addAll(csBtn, pBtn, chemBtn, mBtn);
// Create a ChangeListener for the ToggleGroup group.selectedToggleProperty().addListener( new ChangeListener() { public void changed(ObservableValue<? extends Toggle> ov, final Toggle toggle, final Toggle new_toggle) { String toggleBtn = ((ToggleButton)new_toggle).getText(); selectionMsg.setText("Your selection: " + toggleBtn); } });
// Create the Label for the Selection Label selectLbl = new Label("Select the subject :");
// Create a HBox HBox buttonBox = new HBox();
// Add ToggleButtons to an HBox buttonBox.getChildren().addAll(csBtn, pBtn, chemBtn, mBtn);
// Set the spacing between children to 10px buttonBox.setSpacing(10);
// Create the VBox VBox root = new VBox();
// Add the Labels and HBox to the VBox root.getChildren().addAll(selectionMsg, selectLbl, buttonBox);
// Set the spacing between children to 10px root.setSpacing(10);
// Set the Size of the VBox root.setMinSize(350, 250);
// Set the padding of the VBox // Set the border-style of the VBox // Set the border-width of the VBox // Set the border-insets of the VBox // Set the border-radius of the VBox // Set the border-color of the VBox root.setStyle("-fx-padding: 10;" + "-fx-border-style: solid inside;" + "-fx-border-width: 2;" + "-fx-border-insets: 5;" + "-fx-border-radius: 5;" + "-fx-border-color: blue;");
// Create the Scene Scene scene = new Scene(root);
// Add the scene to the Stage stage.setScene(scene);
// Set the title of the Stage stage.setTitle("A ToggleButton Example");
// Display the Stage stage.show(); }
// Main Method public static void main(String[] args) {
// launch the application Application.launch(args); } } ```
输出:
https://media.geeksforgeeks.org/wp-content/uploads/20180825_185006-1.mp4
注:上述程序可能无法在在线 IDE 中运行。请使用离线编译器。
参考:https://docs . Oracle . com/javase/8/JavaFX/API/JavaFX/scene/control/togglebutton . html
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