Question

I use Viritin MultiSelectTable to display JPA entities. The entities are displayed properly, but when I click on a row, all rows are selected.

I initialize my table as follows:

MultiSelectTable<MyEntity> acFiles = new MultiSelectTable<MyEntity>().withProperties(
        "filedate",
        "filesize",
        "rows",
        "filename"
);

acFiles.setOptions(myDAO.findAll());

acFiles.addListener(((Listener) event -> {
    System.out.println("Clicked Row");
}));

What am I doing wrong, so that all the rows are selected everytime I click?

Answer 1

症状听起来像你在MyEntity类中以某种方式严重实现了equals / hashCode方法实现，而Vaadin将所有对象视为相同。如果它是一个JPA实体，一个非常好的工作策略就是像这样实现它们：

 private enum WindowShowStyle : uint
    {  // find more info at http://stackoverflow.com/a/8210120/1245420
        Hide = 0, ShowNormal = 1, ShowMinimized = 2, ShowMaximized = 3,
        ShowNormalNoActvate = 4, Show = 5, Minimize = 6, ShowNoActivate = 8,
        Restore = 9, ShowDefault = 10, ForceMinimized = 11
    }

    [DllImport("user32.dll", SetLastError = true)]
    static extern System.IntPtr FindWindow(string lpClassName, string lpWindowName);

    [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
    static extern System.IntPtr FindWindowByCaption(System.IntPtr ZeroOnly, string lpWindowName);

    [DllImport("user32.dll")]
    static extern bool ShowWindow(System.IntPtr hWnd, WindowShowStyle nCmdShow);

    DispatcherTimer timer = new System.Windows.Threading.DispatcherTimer();
    public App()
    {
        this.Deactivated += App_Deactivated;
        this.Activated += App_Activated;
        timer.Tick += delegate
        {
            Application.Current.MainWindow.Activate();
            System.IntPtr hWndCharmBar = FindWindowByCaption(System.IntPtr.Zero, "Charm Bar");
                            ShowWindow(hWndCharmBar, 0);
        };
        timer.Interval = new TimeSpan(0, 0, 0, 0, 10);
    }

    void App_Activated(object sender, EventArgs e)
    {
        timer.Stop();
    }

    void App_Deactivated(object sender, EventArgs e)
    {
        timer.Start();
    }

“完美方式”取决于您如何使用标识符。

Vaadin Viritin MultiSelectTable selection is not working properly

1 个答案: