package listDemo;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.stage.Stage;
import javafx.util.Callback;

import java.nio.Buffer;

/**
 * List view 显示
 * @author RiverLei
 * @Date 2021年08月02日
 * @Description: TODO
 * @Version 1.0
 */
public class ListViewPlusDemo extends Application {

 public static void main(String[] args) {
 launch(args);
 }

 TextField textField=new TextField();
 Button add=new Button("ADD");
 Button delete=new Button("delete");
 Button update=new Button("update");

 //创建ListView 指定数据项选择
 ListView<Student> listView=new ListView<>();

 //数据源
 ObservableList<Student> listData=FXCollections.observableArrayList();

 @Override
 public void start(Stage primaryStage) throws Exception {

 listData.add(new Student(1,"shao",true));
 listData.add(new Student(2,"wang",true));
 listData.add(new Student(3,"jiang",true));


 listView.setItems(listData);

 //设置单元格生成器
 listView.setCellFactory(new Callback<ListView<Student>, ListCell<Student>>() {
 @Override
 public ListCell<Student> call(ListView<Student> param) {
 return new MyListCell();
 }
 });


 HBox hBox=new HBox();
 hBox.getChildren().addAll(textField,add,delete,update);
 HBox.setHgrow(textField, Priority.ALWAYS);


 BorderPane borderPane=new BorderPane();
 borderPane.setTop(hBox);
 borderPane.setCenter(listView);

 primaryStage.setScene(new Scene(borderPane,400,400));
 primaryStage.show();

 //添加事件
 add.setOnAction(event -> onAdd());
 delete.setOnAction(event -> onDelete());
 update.setOnAction(event -> onUpdate());
 }

 private void onDelete(){
 int selectedIndex = listView.getSelectionModel().getSelectedIndex();
 if(selectedIndex>=0){
 listData.remove(selectedIndex);
 }
 }

 private void onAdd(){
 String text = textField.getText();
 listData.add(new Student(listData.size()+1,text,true));
 }

 private void onUpdate(){
 String text = textField.getText();

 int selectedIndex = listView.getSelectionModel().getSelectedIndex();
 if(selectedIndex>=0){
 Student student = listData.get(selectedIndex);
 student.name=text;
 listData.set(selectedIndex,student);
 }
 }
 //负责单元格cell的显示
 static class MyListCell extends ListCell<Student>{
 @Override
 protected void updateItem(Student item, boolean empty) {
 //Fx框架 要求必须先diaoyong
 super.updateItem(item, empty);
 if(item!=null){
 this.setText(item.name+"-"+item.id);
 }
 }
 }

 static class Student{

 public int id;
 public String name;
 public boolean sex;
 public Student(){};

 public Student(int id,String name,boolean sex){
 this.id=id;
 this.name=name;
 this.sex=sex;
 }
 }

}