JavaFX |弹出类
Popup 类是 JavaFX 的一部分。Popup 类创建一个没有内容、空填充并且透明的弹出窗口。Popup 类用于显示通知、按钮或下拉菜单等。弹出窗口没有装饰。它本质上是一个没有装饰的特殊场景/窗口。
该类的构造函数:
- Popup() :创建一个 Popup 类的对象。
常用方法:
| 方法 | 说明 |
|---|---|
| getContent() | 要在此弹出窗口上呈现的节点的观察列表。 |
| setAutoHide(boolean v) | 将自动隐藏的值设置为指定的布尔值。 |
| isShowing() | 返回弹出窗口是否可见。 |
下面的程序说明了弹出类的使用:
-
Java program to create a popup and add it to the stage: In this program we create a Popup named popup. The popup contains a Label named label. We also create a Button named button and add event handler to it and then display the popup if it is hidden and hide it if it is already visible. The button is added to the TilePane and the TilePane is added to the scene, and the scene is added to the stage. The show function is called to display the results. The background color of the label is set using the setStyle() function, and the label size is set using setMinHeight(), setMinWidth() function. The hide() and show() function is used to hide or show the popup.
```java // Java program to create a popup and // add it to the stage import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.control.Label; import javafx.stage.Stage; import javafx.stage.Popup;
public class Popup_1 extends Application {
// launch the application public void start(Stage stage) {
// set title for the stage stage.setTitle("Creating popup");
// create a button Button button = new Button("button");
// create a tile pane TilePane tilepane = new TilePane();
// create a label Label label = new Label("This is a Popup");
// create a popup Popup popup = new Popup();
// set background label.setStyle(" -fx-background-color: white;");
// add the label popup.getContent().add(label);
// set size of label label.setMinWidth(80); label.setMinHeight(50);
// action event EventHandler event = new EventHandler() {
public void handle(ActionEvent e) { if (!popup.isShowing()) popup.show(stage); else popup.hide(); } };
// when button is pressed button.setOnAction(event);
// add button tilepane.getChildren().add(button);
// create a scene Scene scene = new Scene(tilepane, 200, 200);
// set the scene stage.setScene(scene);
stage.show(); }
// Main Method public static void main(String args[]) {
// launch the application launch(args); } } ```
输出:
https://media.geeksforgeeks.org/wp-content/uploads/Popup_1.mp4 2. Java Program to create a popup and add it to the stage and make the popup hide automatically when it loses focus using the setAutoHide() function: In this program we create a Popup named popup. The popup contains a Label named label. We also create a Button named button and add event handler to it, to display the popup if it is hidden. The button is added to the TilePane and the TilePane is added to the scene, and the scene is added to the stage. The show function is called to display the results. The popup will automatically hide when it loses focus, we will apply this feature to the popup using the setAutoHide() function.The background color of the label is set using the setStyle() function, and the label size is set using setMinHeight(), setMinWidth() function. The hide() and show() function is used to hide or show the popup.
```java // Java Program to create a popup and add // it to the stage and make the popup hide // automatically when it loses focus using // the setAutoHide() function import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.control.Label; import javafx.stage.Stage; import javafx.stage.Popup;
public class popup_2 extends Application {
// launch the application public void start(Stage stage) {
// set title for the stage stage.setTitle("Creating Popup");
// create a button Button button = new Button("popup");
// create a tile pane TilePane tilepane = new TilePane();
// create a label Label label = new Label("This is a Popup");
// create a popup Popup popup = new Popup();
// set background label.setStyle(" -fx-background-color: white;");
// add the label popup.getContent().add(label);
// set size of label label.setMinWidth(80); label.setMinHeight(50);
// set auto hide popup.setAutoHide(true);
// action event EventHandler event = new EventHandler() { public void handle(ActionEvent e) { if (!popup.isShowing()) popup.show(stage); } };
// when button is pressed button.setOnAction(event);
// add button tilepane.getChildren().add(button);
// create a scene Scene scene = new Scene(tilepane, 200, 200);
// set the scene stage.setScene(scene);
stage.show(); }
// Main Method public static void main(String args[]) {
// launch the application launch(args); } } ```
输出:
https://media.geeksforgeeks.org/wp-content/uploads/Popup_2.mp4
注意: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/stage/popup . html
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