flutter - 如何在触发 Dismissible 的 onDismissed() 操作之前添加操作？

Question

我想在 onDismissed() 操作发生之前添加一个小的 AlertBox 吗？

因此，用户从列表中滑动项目以将其删除，但就在该操作发生之前，我想问他是否确定。

当前的 Dismissible 小部件是否可行？

编辑:

onDismissed: (direction) {
    final User _deletedItem = this._items[index];

    showDialog(
      context: context,
      barrierDismissible: false, // user must tap a button
      builder: (BuildContext context) {
        return AlertDialog(
          content: Text(
              'Are you sure you want to delete this?'),
          actions: <Widget>[
            FlatButton(
              child: Text('Cancel'),
              onPressed: () {
                Navigator.of(context).pop(false);
              },
            ),
            FlatButton(
              child: Text('OK'),
              onPressed: () {
                Navigator.of(context).pop(true);
              },
            ),
          ],
        );
      },
    ).then((answer) {
      if (answer == true) {
        setState(() {
          this._items.removeAt(index);
        });

        Scaffold.of(context).showSnackBar(
          SnackBar(
            content: Text("Deleted"),
            duration: Duration(milliseconds: 2000),
          ),
        );
      } else {
        setState(() {
          this._items.insert(index, _deletedItem);
        });
      }
    });
  },

Answer 1

confirmDismiss属性(property)是你所需要的。