在一列中添加两个按钮，然后获取单击行值javafx [英] Add two button in one column and get the click row value javafx

问题描述

我正在尝试在javafx的表视图中的一列中实现两个按钮。我，能够在一列中实现一个按钮，但不能在一列中添加两个按钮。
我从这个链接中得到了一些想法

在，操作列按钮不会出现。我在哪里做错了。请有人告诉我。

解决方案

缺少 cellValueFactory 项目 tenthColumn 中的单元格 始终 null 。使用 updateItem 方法的第二个参数来确定该行是否为空。

同时指出这一点我将列的类型更改为 TableColumn< Student，Void> 。

此外添加的子项每次更改项目时， HBox 都是不必要的，因为更新 onAction 处理程序，因为 getIndex（）在点击 Button 时进行评估。

你可以将代码更改为：

  TableColumn< Student，Void> tenthCol = new TableColumn<>（Action）; 
 
 ... 
 
 tenthCol.setCellFactory（param  - > new TableCell< Student，Void>（）{
 private final Button editButton = new Button（编辑）; 
 private final Button deleteButton = new Button（delete）; 
 private final HBox pane = new HBox（deleteButton，editButton）; 
 
 {
 deleteButton.setOnAction（event  - > {
 Student getPatient = getTableView（）。getItems（）。get（getIndex（））; 
 System.out.println（getPatient.getId（）+ + getPatient.getName（））; 
}）; 
 
 editButton.setOnAction（event  - > {
 Student getPatient = getTableView（）。getItems（）。get（getIndex （））; 
}）; 
} 
 
 @Override 
 protected void updateItem（Void item，boolean empty）{
 super.updateItem（item ，空）; 
 
 setGraphic（空？null：窗格）; 
} 
}）; 
  

I am trying to implement two button in one column in table view in javafx . I, am able to implement one button in one column but not able to add two button in one column . I got some idea from this link

How to add button in JavaFX table view

Add a button to a cells in a TableView (JAVAFX)

How to add two buttons in a TableColumn of TableView JavaFX

I have use the idea in the link above. However, the code is not working for me.

    TableColumn<Student, String> firstCol = new TableColumn<Student, String>("ID");
    TableColumn<Student, String> secondCol = new TableColumn<Student, String>("Name");
    TableColumn<Student, String> thirdCol = new TableColumn<Student, String>("Quiz Mark");
    TableColumn<Student, String> forthCol = new TableColumn<Student, String>("A1");
    TableColumn<Student, String> fifthCol = new TableColumn<Student, String>("A2");
    TableColumn<Student, String> sixthCol = new TableColumn<Student, String>("A3");
    TableColumn<Student, String> sevenCol = new TableColumn<Student, String>("Exam");
    TableColumn<Student, String> eightCol = new TableColumn<Student, String>("Result");
    TableColumn<Student, String> nineCol = new TableColumn<Student, String>("Grade");
    TableColumn<Student, Student> tenthCol = new TableColumn<Student, Student>("Action");   


firstCol.setCellValueFactory(new PropertyValueFactory<>("Id"));
    secondCol.setCellValueFactory(new PropertyValueFactory<>("Name"));
    thirdCol.setCellValueFactory(new PropertyValueFactory<>("QuizMark"));
    forthCol.setCellValueFactory(new PropertyValueFactory<>("Assingment1Mark"));
    fifthCol.setCellValueFactory(new PropertyValueFactory<>("Assingment2Mark"));
    sixthCol.setCellValueFactory(new PropertyValueFactory<>("Assingment3Mark"));
    sevenCol.setCellValueFactory(new PropertyValueFactory<>("ExamMark"));
    eightCol.setCellValueFactory(new PropertyValueFactory<>("Result"));
    nineCol.setCellValueFactory(new PropertyValueFactory<>("Grade"));
    tenthCol.setCellFactory(param -> new TableCell<Student, Student>() {
        private final Button editButton = new Button("edit");
        private final Button deleteButton = new Button("delete");
        HBox pane = new HBox(deleteButton, editButton);

        @Override
        protected void updateItem(Student patient, boolean empty) {
            super.updateItem(patient, empty);

            if (patient == null) {
                setGraphic(null);
                return;
            }

            deleteButton.setOnAction(event -> {
                Student getPatient = getTableView().getItems().get(getIndex());
                System.out.println(getPatient.getId() + "   " + getPatient.getName());
            });

            editButton.setOnAction(event -> {
                Student getPatient = getTableView().getItems().get(getIndex());
            });
            pane.getChildren().addAll(deleteButton,editButton);
            setGraphic(pane);
        }
    });

In, the action column buttons doesn't appears. Where am I doing mistake. Please anyone let me know.

解决方案

Lacking a cellValueFactory the item for cells in tenthColumn is always null. Use the second argument of the updateItem method to determine if the row is empty or not.

Also to indicate this I'd change the type of the column to TableColumn<Student, Void>.

Furthermore adding the children of the HBox again every time the item is changed is unnecessary as is updating the onAction handlers, since getIndex() is evaluated at the time the Button is clicked.

You could change the code to this:

TableColumn<Student, Void> tenthCol = new TableColumn<>("Action");

...

tenthCol.setCellFactory(param -> new TableCell<Student, Void>() {
    private final Button editButton = new Button("edit");
    private final Button deleteButton = new Button("delete");
    private final HBox pane = new HBox(deleteButton, editButton);

    {
        deleteButton.setOnAction(event -> {
            Student getPatient = getTableView().getItems().get(getIndex());
            System.out.println(getPatient.getId() + "   " + getPatient.getName());
        });

        editButton.setOnAction(event -> {
            Student getPatient = getTableView().getItems().get(getIndex());
        });
    }

    @Override
    protected void updateItem(Void item, boolean empty) {
        super.updateItem(item, empty);

        setGraphic(empty ? null : pane);
    }
});

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