Question

我正在使用DatePickerCell类在TableView单元格中创建Datepicker，但我无法保留其值。

这是用于呈现单元格的DatePickerCell类，它是从带有生日示例的论坛中获取的。

public class DatePickerCell<S, T> extends TableCell<T, Date> {

private DatePicker datePicker;

public DatePickerCell() {

    super();

    if (datePicker == null) {
        createDatePicker();
    }
    setGraphic(datePicker);
    setContentDisplay(ContentDisplay.GRAPHIC_ONLY);

    Platform.runLater(new Runnable() {
        @Override
        public void run() {
            datePicker.requestFocus();
        }
    });
}

@Override
public void updateItem(Date item, boolean empty) {

    super.updateItem(item, empty);

    SimpleDateFormat smp = new SimpleDateFormat("dd/MM/yyyy");

    if (null == this.datePicker) {
        System.out.println("datePicker is NULL");
    }

    if (empty) {
        setText(null);
        setGraphic(null);
    } else {

        if (isEditing()) {
            setContentDisplay(ContentDisplay.TEXT_ONLY);

        } else {
            setDatepikerDate(smp.format(new Date()));
            setText(smp.format(new Date()));
            setGraphic(this.datePicker);
            setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
        }
    }
}

private void setDatepikerDate(String dateAsStr) {

    LocalDate ld = null;
    int day, month, year;

    day = month = year = 0;
    try {
        day = Integer.parseInt(dateAsStr.substring(0, 2));
        month = Integer.parseInt(dateAsStr.substring(3, 5));
        year = Integer.parseInt(dateAsStr.substring(6, dateAsStr.length()));
    } catch (NumberFormatException e) {
        System.out.println("setDatepikerDate / unexpected error " + e);
    }

    ld = LocalDate.of(year, month, day);
    datePicker.setValue(ld);
}

private void createDatePicker() {
    this.datePicker = new DatePicker();
    datePicker.setPromptText("dd/MM/yyyy");
    datePicker.setEditable(true);

    datePicker.setOnAction(t -> {
        LocalDate date = datePicker.getValue();
        int index1 = getIndex();

        SimpleDateFormat smp = new SimpleDateFormat("dd/MM/yyyy");
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_MONTH, date.getDayOfMonth());
        cal.set(Calendar.MONTH, date.getMonthValue() - 1);
        cal.set(Calendar.YEAR, date.getYear());

        setText(smp.format(cal.getTime()));
        commitEdit(cal.getTime());
    });

    setAlignment(Pos.CENTER);
}

@Override
public void startEdit() {
    super.startEdit();
}

@Override
public void cancelEdit() {
    super.cancelEdit();
    setContentDisplay(ContentDisplay.TEXT_ONLY);
}

public DatePicker getDatePicker() {
    return datePicker;
}

public void setDatePicker(DatePicker datePicker) {
    this.datePicker = datePicker;
}

}

我想知道的是，当我在表中使用它并尝试添加一行或多行时，先前行中先前选择的日期设置为默认（系统日期）日期，并且我选择的值已消失。我无法理解为什么重新初始化所有日期选择器或重置日期。

这就是我在我的代码中使用它的方式

@FXML private TableView<Stock> tblStock;
@FXML private TableColumn<Stock, Date> colDate;

colDate.setCellValueFactory(new PropertyValueFactory<>("date1"));
    colDate.setCellFactory(cell -> new DatePickerCell());

在我的Stock类中，这就是我初始化date1

的方式

private Date date1 = new Date();

Answer 1

最后，经过长时间的搜索，我才能实现目标。感谢这个person，我得到了一个带有datepicker的工作表单元格。

以下是未来参考的代码：

DatePickerCell类

private SimpleObjectProperty<Date> date = new SimpleObjectProperty<>(/*your parameter*/);

//getter
public Date getDate() {
    return date.get();
}

//property getter
public SimpleObjectProperty<Date> dateProperty() {
    return date;
}

//setter
public void setDate(Date date) {
    this.date.set(date);
}

在应用中使用

模型类

@FXML private TableColumn<Stock, Date> colDate;

//because using FXML document, initialization not needed

colDate.setCellValueFactory(cell -> cell.getValue().dateProperty());

colDate.setCellFactory(cell -> new DatePickerCell<Stock, Date>());

colDate.setOnEditCommit(event -> event.getTableView().getItems()
   .get(event.getTablePosition().getRow()).setDate(event.getNewValue()));

控制器的

<?php

function method_1(Array &$arr) {
    return $arr === array_values($arr);
}

function method_2(Array &$arr) {
    for (reset($arr), $i = 0; key($arr) !== $i++; next($arr));
    return is_null(key($arr));
}

function method_3(Array &$arr) {
    return array_keys($arr) === range(0, count($arr) - 1);
}

function method_4(Array &$arr) {
    $idx = 0;
    foreach( $arr as $key => $val ){
        if( $key !== $idx )
            return FALSE;
        $idx++;
    }
    return TRUE;
}




function benchmark(Array $methods, Array &$target){    
    foreach($methods as $method){
        $start = microtime(true);
        for ($i = 0; $i < 1000; $i++)
            $dummy = call_user_func($method, $target);

        $end = microtime(true);
        echo "Time taken with $method = ".round(($end-$start)*1000.0,3)."ms\n";
    }
}



$targets = [
    'Huge array' => range(0, 30000),
    'Small array' => range(0, 1000),
];
$methods = [
    'method_1',
    'method_2',
    'method_3',
    'method_4',
];
foreach($targets as $targetName => $target){
    echo "==== Benchmark using $targetName ====\n";
    benchmark($methods, $target);
    echo "\n";
}

希望将来有所帮助。

DatePicker的值继续在Javafx

1 个答案: