java - Vaadin 8.5.1-行更新后刷新网格

Question

我正在使用 Vaadin 8.5.1 Grid 来显示 1000 行。一旦一行更新了它的属性更改，我就使用grid.getDataProvider().refreshItem(selectedRow)或者grid.getDataProvider().refreshAll() 更新行失败。

我需要执行显式 grid.setItems() 来查看行的更新属性。

我正在使用下面的代码片段创建一个网格

    msgGrid = new ABSMsgGrid();

    List<ConsoleEntry> messageEntryList = new ArrayList<>();
    if (inputConsole != null) {
        messageEntryList.addAll(inputConsole.getMessageEntryList());
    }

    msgGridDataProvider = new ListDataProvider<ConsoleEntry>(messageEntryList) {

        @Override
        public Object getId(ConsoleEntry item) {
            return item.getId();
        }
    };

    msgGrid.setDataProvider(msgGridDataProvider);



//on changing property of the grid row, i use the below snippet
private void handleHideRowMenuItem(GridContextMenu<ConsoleEntry> contextMenu, ConsoleEntry selectedConsoleItem) {
        if (!selectedConsoleItem.isHidden()) {
            hideRowMenuItem = contextMenu.addItem("Hide Row", VaadinIcons.EYE_SLASH, selectedMenuItem -> {
                    selectedConsoleItem.hide();
                    **msgGridDataProvider.refreshItem(selectedConsoleItem);**
                }
            });
        }
}

public class ConsoleEntry {

        @Override
        public boolean equals(Object obj) {
            // TODO Auto-generated method stub
            if (obj instanceof ConsoleEntry) {
                ConsoleEntry temp = (ConsoleEntry) obj;
                String msgRef2 = temp.getMsgRef();
                return this.getMsgRef().equalsIgnoreCase(msgRef2);
            }
            return false;
        }

        @Override
        public int hashCode() {
            // TODO Auto-generated method stub
            return super.hashCode();
        }

        public String getId(){
            return this.getMsgRef();
        }
}       

我见过类似的问题，但没有一个解决方案有效。

How to refresh the vaadin Grid after you change something?

Vaadin - Refresh grid after row modification

感谢是否有人可以分享有关如何解决此问题的指示

TIA

Answer 1

要使一个项目被视为同一项目(以及刷新工作)，您需要正确实现 equals()和 hashCode()对象上的方法。

来自文档

public void refreshItem(T​ item)

Description copied from interface: DataProvider

Refreshes the given item. This method should be used to inform all DataProviderListeners that an item has been updated or replaced with a new instance.

For this to work properly, the item must either implement

equals(​Object) and #hashCode() to consider both the old and the new item instances to be equal, or alternatively

DataProvider.​getId(​Object) should be implemented to return an appropriate identifier.

除此之外，您还应该创建一个 ListDataProvider ，将其分配给网格，然后通过先前分配的相同实例进行更新 ListDataProvider