在JavaFx TableView

Question

我正在尝试在列的所有行中插入带有文本“删除”的HyperLink。单击按钮时，只会插入TabelView行。也会插入超链接，但不会插入所有行。如果添加了下一行数据，它会自动获取前一行的空白单元格。截图：

将创建超链接侦听器，以便在单击时删除所选行。

当用户点击按钮时调用此方法，这里我创建了链接：

public void SalesAdd(ActionEvent actionEvent){


    if(quantity.getText().isEmpty()){
        quantity.setStyle("-fx-border-color: red");
        return;
    }
    String name = comboBox.getSelectionModel().getSelectedItem();
    String batch = batchno.getText();
    String exp = expDate.getText();
    int qty = Integer.parseInt(quantity.getText());
    Double mrp1 = Double.valueOf(mrp.getText());
    Double amt = Double.valueOf(amount.getText());
    Double mrpAmount = mrp1*qty;

    PropertyValueFactory<TableData,String> namePro = new PropertyValueFactory<TableData,String>("name");
    PropertyValueFactory<TableData,Integer> qtyPro = new PropertyValueFactory<TableData,Integer>("qty");
    PropertyValueFactory<TableData,String> expPro = new PropertyValueFactory<TableData,String>("exp");
    PropertyValueFactory<TableData,String> batchPro = new PropertyValueFactory<TableData,String>("batch");
    PropertyValueFactory<TableData,Double> mrpPro = new PropertyValueFactory<TableData,Double>("mrp");
    PropertyValueFactory<TableData,Double> amtPro = new PropertyValueFactory<TableData,Double>("amt");
    PropertyValueFactory<TableData,Hyperlink> rmbutton = new PropertyValueFactory<TableData,Hyperlink>("rbutton");

    nameColumn.setCellValueFactory(namePro);
    qtyColumn.setCellValueFactory(qtyPro);
    expColumn.setCellValueFactory(expPro);
    batchColumn.setCellValueFactory(batchPro);
    mrpColumn.setCellValueFactory(mrpPro);
    amtColumn.setCellValueFactory(amtPro);
    removeRowColumn.setCellValueFactory(rmbutton);



    for(TableData data:tableData){
        if(data.getName()==comboBox.getEditor().getText() || data.getName() == comboBox.getSelectionModel().getSelectedItem().toString()){
            common.dialogAlert("Already in Table!","Already in the Table!","Already Exist,Please change the quantity!");
            return;
        }

    }

    tableData.add(new TableData(name,batch,exp,qty,mrp1,mrpAmount, rbutton));
    tableView.setItems(tableData);

    clearInput();
    calctotal();


}

TableData类：

public class TableData extends ActionEvent {
private final SimpleStringProperty name;
private final SimpleStringProperty batch;
private final SimpleStringProperty exp;
private final SimpleIntegerProperty qty;
private final SimpleDoubleProperty mrp;
private final SimpleDoubleProperty amt;
private final Hyperlink rbutton;

public Hyperlink getRbutton() {
    return rbutton;
}

public TableData(String name, String batch,
                 String exp, int qty, Double mrp, Double amt, Hyperlink rbutton) {
    this.name = new SimpleStringProperty(name);
    this.batch = new SimpleStringProperty(batch);
    this.exp = new SimpleStringProperty(exp);
    this.qty = new SimpleIntegerProperty(qty);
    this.mrp = new SimpleDoubleProperty(mrp);
    this.amt = new SimpleDoubleProperty(amt);
    this.rbutton = rbutton;
    this.amt.bind(this.qty.multiply(this.mrp));


}

public String getName() {
    return name.get();
}

public SimpleStringProperty nameProperty() {
    return name;
}

public void setName(String name) {
    this.name.set(name);
}

public String getBatch() {
    return batch.get();
}

public SimpleStringProperty batchProperty() {
    return batch;
}

public void setBatch(String batch) {
    this.batch.set(batch);
}

public String getExp() {
    return exp.get();
}

public SimpleStringProperty expProperty() {
    return exp;
}

public void setExp(String exp) {
    this.exp.set(exp);
}

public int getQty() {
    return qty.get();
}

public SimpleIntegerProperty qtyProperty() {
    return qty;
}

public void setQty(int qty) {
    this.qty.set(qty);
}

public double getMrp() {
    return mrp.get();
}

public SimpleDoubleProperty mrpProperty() {
    return mrp;
}

public void setMrp(double mrp) {
    this.mrp.set(mrp);
}

public double getAmt() {
    return amt.get();
}

public SimpleDoubleProperty amtProperty() {
    return amt;
}

public void setAmt(double amt) {
    this.amt.set(amt);
}

}

如何为列中的每一行添加相同的HyperLink？

Answer 1

在项目类中包含UI元素很少是个好主意（同样不需要扩展ActionEvent）。链接独立于任何项目值，因此不应使用它。而是使用在非空时显示链接的单元格：

public class RemoveCell<T> extends TableCell<T, Void> {

    private final Hyperlink link;

    public RemoveCell() {
        link = new Hyperlink("Remove");
        link.setOnAction(evt -> {
            // remove row item from tableview
            getTableView().getItems().remove(getTableRow().getIndex());
        });
    }

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

        setGraphic(empty ? null : link);
    }

}

此单元格不会获取任何数据。而是仅针对非空单元格（setGraphic(empty ? null : link);）显示链接。当触发onAction的{​​{1}}事件时，Hyperlink提供的数据用于从包含该单元格的TableCell中删除相应的元素。如果需要在删除项目时执行其他操作，可以将附加代码添加到lambda表达式的主体中。

不要对TableView使用cellValueFactory（选择removeRowColumn作为值类型仅允许Void值），而只需使用null创建cellFactory S：

RemoveCell

BTW：您似乎正在重新创建按钮上的removeRowColumn.setCellFactory(tc -> new RemoveCell<>()); 点击插入一个新项目。对于整个表而言，这样做一次是一个更好的主意，而不是每个插入的表行一次。