Javafx TableCell中的DatePicker

问题描述

我已经实现了一个自定义的datePickerTableCell来显示单元格编辑上的日期选择器。我正在使用ExtFX DatePicker（） 。一切正常，除非我手动输入日期而不是从选择器中选择日期，我在commitEdit（）上得到一个NullPointerException。

I have implemented a custom datePickerTableCell to show a date picker on cell edit. I am using the ExtFX DatePicker (https://bitbucket.org/sco0ter/extfx/overview). Everything works fine except when I enter the date manually instead of choosing it from picker, I get a NullPointerException on commitEdit().

datePicker.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent t) {
    if (t.getCode() == KeyCode.ENTER) {
        if(getItem() == null) {
            commitEdit(null);
        } else {
            commitEdit(getItem());
        }
    } else if (t.getCode() == KeyCode.ESCAPE) {
        cancelEdit();
    }
}
});

我发现这里出了什么问题。

I coudnt find whats going wrong here.

推荐答案

也许看看这个例子。它使用颜色选择器，但也适用于日期选择器：

Maybe have a look at this example. It uses a color picker but works as well for a date picker:

public class ColorTableCell<T> extends TableCell<T, Color> {
    private final ColorPicker colorPicker;

    public ColorTableCell(TableColumn<T, Color> column) {
        this.colorPicker = new ColorPicker();
        this.colorPicker.editableProperty().bind(column.editableProperty());
        this.colorPicker.disableProperty().bind(column.editableProperty().not());
        this.colorPicker.setOnShowing(event -> {
            final TableView<T> tableView = getTableView();
            tableView.getSelectionModel().select(getTableRow().getIndex());
            tableView.edit(tableView.getSelectionModel().getSelectedIndex(), column);
        });
        this.colorPicker.valueProperty().addListener((observable, oldValue, newValue) -> {
            if(isEditing()) {
                commitEdit(newValue);
            }
        });
        setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
    }

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

        setText(null);
        if(empty) {
            setGraphic(null);
        } else {
            this.colorPicker.setValue(item);
            this.setGraphic(this.colorPicker);
        }
    }
}

如果您使用的是Java 7，用匿名内部类替换lambdas，但它也应该工作。完整的博客文章是这里。

If you're on Java 7, replace the lambdas with anonymous inner classes, but it should work as well. Full blog post is here.

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