BorderPane示例程序

痛定思痛。 2022-12-07 12:08 164阅读 0赞

## Java代码 **(** Java Code **)** ##

![Man working on a laptop][]

Image Source Ltd./Vetta/Getty Images Image Source Ltd./Vetta/Getty Images

This [JavaFX][] example code shows how to use the `BorderPane` layout. The JavaFX scene is made up of a `VBox` containing the a `HBox` and the `BorderPane`. A JavaFX label is placed in each of the five regions of the `BorderPane`. A `Button` and `ChoiceBox` can be used to display the label for a particular region. As one label is displayed the previous label is made invisible.

此[JavaFX][]示例代码显示如何使用`BorderPane`布局。 JavaFX场景由包含`HBox`和`BorderPane`的`VBox` 。 JavaFX标签放置在`BorderPane`的五个区域中的每个区域中。 `Button`和`ChoiceBox`可用于显示特定区域的标签。 显示一个标签时，使先前的标签不可见。

The article that goes with this example program is [BorderPane Overview][].

该示例程序附带的文章是[BorderPane概述][BorderPane Overview] 。

## 例 **(** Example **)** ##

import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Label; import javafx.scene.control.ChoiceBox; import javafx.scene.control.Button; import javafx.scene.layout.BorderPane; import javafx.scene.layout.VBox; import javafx.scene.layout.HBox; import javafx.stage.Stage; public class BorderPaneExample extends Application { //Declare label controls for the different BorderPane areas final Label topLabel = new Label("Top Pane"); final Label leftLabel = new Label("Left Pane"); final Label rightLabel = new Label("Right Pane"); final Label centerLabel = new Label("Center Pane"); final Label bottomLabel = new Label("Bottom Pane"); @Override public void start(Stage primaryStage) { //The scene will have a VBox containing //a HBox and a BorderPabe VBox root = new VBox(10); HBox showControls = new HBox(10); final BorderPane controlLayout = new BorderPane(); //Set the size of the BorderPane and show its borders //by making them black controlLayout.setPrefSize(600,400); controlLayout.setStyle("-fx-border-color: black;"); //Call the setLabelVisible method which sets one label to be visible //and the others to be hidden setLabelVisible("Top");                  //Put each label in its correponding BorderPane area controlLayout.setTop(topLabel); controlLayout.setLeft(leftLabel); controlLayout.setRight(rightLabel); controlLayout.setCenter(centerLabel); controlLayout.setBottom(bottomLabel); //Align the labels to be in the center of their BorderPane //area controlLayout.setAlignment(topLabel, Pos.CENTER); controlLayout.setAlignment(centerLabel, Pos.CENTER); controlLayout.setAlignment(bottomLabel, Pos.CENTER); //Create a ChoiceBox to hold the BorderPane area names final ChoiceBox panes = new ChoiceBox(); panes.getItems().addAll("Top", "Left", "Right", "Center", "Bottom"); panes.setValue("Top"); //Create a button to trigger which label is visible Button moveBut = new Button("Show Pane");         moveBut.setOnAction(new EventHandler<actionevent>() { @Override public void handle(ActionEvent arg0) { //Call the setLabelVisible method to set the                 //correct label to be visible based on the //value of the ChoiceBox setLabelVisible(panes.getValue().toString()); } }); //Add the Button and ChoiceBox to the HBox showControls.getChildren().add(moveBut); showControls.getChildren().add(panes); //Add the HBox and BorderPane to the VBOx root.getChildren().add(showControls); root.getChildren().add(controlLayout); Scene scene = new Scene(root, 600, 500); primaryStage.setTitle("BorderPane Layout Example"); primaryStage.setScene(scene); primaryStage.show(); } //A simple method which changes the visibility of the //labels depending on the string passed public void setLabelVisible(String labelName) { switch (labelName){ case "Top": topLabel.setVisible(true); leftLabel.setVisible(false); rightLabel.setVisible(false); centerLabel.setVisible(false); bottomLabel.setVisible(false); break; case "Left": topLabel.setVisible(false); leftLabel.setVisible(true); rightLabel.setVisible(false); centerLabel.setVisible(false); bottomLabel.setVisible(false); break; case "Right": topLabel.setVisible(false); leftLabel.setVisible(false); rightLabel.setVisible(true); centerLabel.setVisible(false); bottomLabel.setVisible(false); break; case "Center": topLabel.setVisible(false); leftLabel.setVisible(false); rightLabel.setVisible(false); centerLabel.setVisible(true); bottomLabel.setVisible(false); break; case "Bottom": topLabel.setVisible(false); leftLabel.setVisible(false); rightLabel.setVisible(false); centerLabel.setVisible(false); bottomLabel.setVisible(true); break; default: break; }; } /** * The main() method is ignored in correctly deployed JavaFX application. * main() serves only as fallback in case the application can not be * launched through deployment artifacts, e.g., in IDEs with limited FX * support. NetBeans ignores main(). * * @param args the command line arguments */ public static void main(String[] args) { launch(args); } }

> 翻译自: [https://www.thoughtco.com/borderpane-example-program-2033948][https_www.thoughtco.com_borderpane-example-program-2033948]

[Man working on a laptop]: /images/20221123/48c0278e68d44cc0a5ca4ff82639497e.png
[JavaFX]: https://www.thoughtco.com/what-is-javafx-2034192
[BorderPane Overview]: https://www.thoughtco.com/gridpane-overview-2033946
[https_www.thoughtco.com_borderpane-example-program-2033948]: https://www.thoughtco.com/borderpane-example-program-2033948