JavaFx:从TableView获取新旧值 [英] JavaFx: Get the new and old values from TableView

问题描述

我在TreeMap中保存了数据，并使用ObservableList呈现了地图数据.我需要直接在TableView上编辑String值.问题是，如何更改TreeMap上的真实数据，即如何从数据列表中获取旧的和新的str值并将其放入地图键中.

I have the data in a TreeMap and I use ObservableList to render the map data. I need to edit the String value direct on my TableView. The problem is, how can I change the real data on TreeMap, i.e. how can I get the old and new str values from data list to put it in map key.

private Map<String, Long> map = new TreeMap<>();

private ObservableList<TableBean> data = FXCollections.observableArrayList();
....

articles.setCellFactory(TextFieldTableCell.forTableColumn());
    articles.setOnEditCommit(
              t -> {
                    ((TableBean) t.getTableView().getItems().get(
                                t.getTablePosition().getRow())
                      ).setArticles(t.getNewValue());

                    //Edited:
                     System.out.println(t.getOldValue());

                  });

getOldValue方法不起作用.我用这种方法获得了新的价值.

getOldValue method dosn't work. I get with this method just the new value.

推荐答案

在lambda表达式中使用的 CellEditEvent t实际上具有方法getOldValue().它将返回特定单元格的前值.

The CellEditEvent t you are using within you lambda expression actually has the method getOldValue(). It will return the former value of the particular cell.

articles.setOnEditCommit(
    t -> {
        ((TableBean) t.getTableView().getItems().get(
        t.getTablePosition().getRow())
        ).setArticles(t.getNewValue());
//  you can use "t.getOldValue()" here to get the old value of the particular cell
    });

在将新值设置为新值之前，不可能将旧值从数据列表中删除吗?

Would it not be possible, to get you old value out of the data list, before you set it to the new one?

articles.setCellFactory(TextFieldTableCell.forTableColumn());
articles.setOnEditCommit(
          t -> {
                // get your old value before update it
                System.out.println(((TableBean) t.getTableView().getItems().get(
                            t.getTablePosition().getRow())
                  ).getArticles());

                ((TableBean) t.getTableView().getItems().get(
                            t.getTablePosition().getRow())
                  ).setArticles(t.getNewValue());

                //Edited:
                 System.out.println(t.getOldValue());

              });

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