【JavaFx基础】Application里操作Controller

╰+攻爆jí腚メ 2023-10-11 21:14 19阅读 0赞

**一、需求描述**

在主线程中用Controller操纵fxml文件里的控件，使圆自适应窗口大小。

（由于fxml无法通过事件绑定，Controller也不会自动调用绑定逻辑）

**二、操作步骤**

![98e0f6c39af349818e2485123fdc140a.png][]

**HelloApplication文件代码：**

package com.example.fxtest2;
    import javafx.application.Application;
    import javafx.event.ActionEvent;
    import javafx.event.EventHandler;
    import javafx.fxml.FXMLLoader;
    import javafx.scene.ImageCursor;
    import javafx.scene.Parent;
    import javafx.scene.Scene;
    import javafx.scene.control.Button;
    import javafx.scene.control.Control;
    import javafx.scene.control.Label;
    import javafx.scene.control.TextField;
    import javafx.scene.image.Image;
    import javafx.scene.image.ImageView;
    import javafx.scene.input.Dragboard;
    import javafx.scene.input.KeyCode;
    import javafx.scene.input.TransferMode;
    import javafx.scene.layout.AnchorPane;
    import javafx.scene.layout.Border;
    import javafx.scene.layout.BorderPane;
    import javafx.scene.layout.Pane;
    import javafx.scene.shape.Circle;
    import javafx.scene.text.Font;
    import javafx.scene.text.FontWeight;
    import javafx.stage.Modality;
    import javafx.stage.Stage;
    import java.io.IOException;
    import java.net.URL;
    import java.util.Objects;
    
    public class HelloApplication extends Application {
        @Override
        public void start(Stage stage) throws IOException {
            //不能简单用 Pane root=FXMLLoader.load(getClass().getResource("hello-view.fxml"));
            FXMLLoader fxmlLoader=new FXMLLoader();
            fxmlLoader.setLocation(getClass().getResource("TableViewTest.fxml"));
            Parent root=fxmlLoader.load();
            Scene scene=new Scene(root);
            HelloController control=fxmlLoader.getController();
            control.circleLocationBind(scene);
            stage.setScene(scene);
            stage.show();
           System.out.println("start()...");//次调用
        }
        @Override
        public void init() throws Exception {
            super.init();
            System.out.println("init()...");//先调用
        }
        @Override
        public void stop() throws Exception {
            super.stop();
            System.out.println("stop()...");//窗口关闭自动调用
        }
        public static void main(String[] args) {
    
            launch();
        }
    
    }

**HelloController文件代码：**

package com.example.fxtest2;
    
    import javafx.collections.FXCollections;
    import javafx.collections.ObservableList;
    import javafx.fxml.FXML;
    import javafx.scene.Scene;
    import javafx.scene.control.Button;
    import javafx.scene.control.Label;
    import javafx.scene.control.TableColumn;
    import javafx.scene.control.TableView;
    import javafx.scene.control.cell.PropertyValueFactory;
    import javafx.scene.shape.Circle;
    
    public class HelloController {
    
        @FXML
        private Circle ci;
        public void circleLocationBind(Scene scene){
            ci.centerXProperty().bind(scene.widthProperty().divide(2));//圆心x轴坐标值保持在窗口一半的位置
            ci.centerYProperty().bind(scene.heightProperty().divide(2));//圆心y轴坐标值保持在窗口一半的位置
        }
    }

**TableViewTest.fxml文件代码：**

<?xml version="1.0" encoding="UTF-8"?>
    
    <?import javafx.scene.layout.AnchorPane?>
    <?import javafx.scene.shape.Circle?>
    
    <AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.fxtest2.HelloController">
       <children>
          <Circle fx:id="ci" fill="DODGERBLUE" centerX="200.0" centerY="300.0" radius="100.0" stroke="BLACK" strokeType="INSIDE" />
       </children>
    </AnchorPane>

**运行效果：**

![1d6c0c98d9374d778f132532b46b5962.png][]

**三、参考链接**

Application里操作Controller学习教程[https://www.bilibili.com/video/BV1Qf4y1F7Zv/?p=12&spm\_id\_from=pageDriver&vd\_source=841fee104972680a6cac4dbdbf144b50][https_www.bilibili.com_video_BV1Qf4y1F7Zv_p_12_spm_id_from_pageDriver_vd_source_841fee104972680a6cac4dbdbf144b50]

[98e0f6c39af349818e2485123fdc140a.png]: https://img-blog.csdnimg.cn/98e0f6c39af349818e2485123fdc140a.png
[1d6c0c98d9374d778f132532b46b5962.png]: https://img-blog.csdnimg.cn/1d6c0c98d9374d778f132532b46b5962.png
[https_www.bilibili.com_video_BV1Qf4y1F7Zv_p_12_spm_id_from_pageDriver_vd_source_841fee104972680a6cac4dbdbf144b50]: https://www.bilibili.com/video/BV1Qf4y1F7Zv/?p=12&spm_id_from=pageDriver&vd_source=841fee104972680a6cac4dbdbf144b50