java JavaFX | Pos 类

JavaFX | Pos 类

原文:https://www.geeksforgeeks.org/javafx-pos-class/

Pos 类是 JavaFX 的一部分。Pos 类包含表示水平和垂直定位或对齐的值。Pos 类继承枚举类。

常用方法:

方法	说明
getHpos()	返回水平对齐方式。
getVpos()	返回垂直对齐方式。
valueOf(字符串 n)	返回名称为指定字符串的 Pos 对象。
值()	返回包含所有 Pos 值的数组。

以下程序说明了位置类的使用:

Java Program to create a tilepane and add a specified Pos value as its alignment: In this program we will create a TilePane named tile_pane. Add Label named label and some buttons to the tile_pane. Set the Alignment of the tile_pane using the setAlignment() function. Set the alignment of the tile_pane to the Pos value TOP_LEFT. Add the tile_pane to the scene and add the scene to the stage and call the show() function to display the final results.

```java // Java Program to create a tilepane and add // a specified Pos value as its alignment import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.; import javafx.scene.layout.; import javafx.stage.Stage; import javafx.geometry.; import javafx.scene.paint.; import javafx.scene.canvas.; import javafx.scene.text.; import javafx.scene.Group; import javafx.scene.shape.*;

public class Pos_1 extends Application {

// launch the application     public void start(Stage stage)     {

try {

// set title for the stage             stage.setTitle("Pos");

// create a label             Label label = new Label("this is Pos example");

// create a Tile pane             TilePane tile_pane = new TilePane(label);

// create and add buttons to tilepane             for (int i = 1; i <= 7; i++) {                 tile_pane.getChildren().add(new Button("Button " + i));             }

// set Alignment of pane             tile_pane.setAlignment(Pos.TOP_LEFT);

// create a scene             Scene scene = new Scene(tile_pane, 400, 300);

// set the scene             stage.setScene(scene);

stage.show();         }

catch (Exception e) {

System.out.println(e.getMessage());         }     }

// Main Method     public static void main(String args[])     {

// launch the application         launch(args);     } } ```

输出:
Java Program to create a TilePane and a combobox that contains different values of Pos: In this program we will create a TilePane named tile_pane. Add Label named label and some buttons to the tile_pane. Set the Alignment of the tile_pane using the setAlignment() function. We will set the alignment of the tile_pane to the Pos value BASELINE_CENTER. Store all the names of Pos values in a String array. Now create a combobox which will contain the names of Pos values and also cranate a Action Event to handle the combobox events. The Event handler will set the Alignment of the tilepane to the chosen pos value. Now create a VBox and add the tilepane and the combo box to vbox. Finally, add the vbox to the scene and add the scene to the stage and call the show() function to display the final results.

```java // Java Program to create a TilePane and // a combobox that contains different // values of Pos import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.; import javafx.scene.layout.; import javafx.stage.Stage; import javafx.geometry.; import javafx.scene.paint.; import javafx.scene.canvas.; import javafx.scene.text.; import javafx.scene.Group; import javafx.scene.shape.; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.collections.;

public class Pos_2 extends Application {

// launch the application public void start(Stage stage) {

try {

// set title for the stage         stage.setTitle("Pos Class");

// create a label         Label label = new Label("This is Pos Class Example");

// create a Tile pane         TilePane tile_pane = new TilePane(label);

// create and add buttons to tilepane         for (int i = 1; i <= 7; i++) {

tile_pane.getChildren().add(new Button("Button " + i));         }

// set Alignment of pane         tile_pane.setAlignment(Pos.BASELINE_CENTER);

// pos names         String pos_name[] = {"BASELINE_CENTER", "BASELINE_LEFT",                              "BASELINE_RIGHT", "BOTTOM_CENTER",                              "BOTTOM_LEFT", "BOTTOM_RIGHT",                              "CENTER", "CENTER_LEFT", "CENTER_RIGHT",                              "TOP_CENTER", "TOP_LEFT", "TOP_RIGHT"};

// Create a combo box         ComboBox combo_box =           new ComboBox(FXCollections.observableArrayList(pos_name));

// Create action event         EventHandler event =         new EventHandler() {

public void handle(ActionEvent e)             {

// set Alignement of the TilePane                 tile_pane.setAlignment(Pos.valueOf(                      (String)combo_box.getValue()));             }         };

// Set on action         combo_box.setOnAction(event);

// create a VBox         VBox vbox = new VBox(30, combo_box, tile_pane);

// set Alignemnet         vbox.setAlignment(Pos.CENTER);

// create a scene         Scene scene = new Scene(vbox, 400, 300);

// set the scene         stage.setScene(scene);

stage.show();     }

catch (Exception e) {

System.out.println(e.getMessage());     } }

// Main Method public static void main(String args[]) {

// launch the application     launch(args); } } ```

输出:

https://media.geeksforgeeks.org/wp-content/uploads/Pos_2.mp4