WPF:按住单击+双击问题

Question

我必须处理单击和双击WPF应用程序中的按钮并进行不同的反应.不幸的是,在双击时,WPF会触发两次点击事件和双击事件,因此很难处理这种情况.

它试图用计时器解决它,但没有成功...我希望你能帮助我.

让我们看看代码:

private void delayedBtnClick(object statInfo)
{
    if (doubleClickTimer != null)
        doubleClickTimer.Dispose();
    doubleClickTimer = null;

    this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal, new VoidDelegate(delegate()
    {
        // ... DO THE SINGLE CLICK ACTION
    }));
}

private void btn_Click(object sender, RoutedEventArgs e)
{
    if (doubleClickTimer == null)
        doubleClickTimer = new Timer(delayedBtnClick, null, System.Windows.Forms.SystemInformation.DoubleClickTime, Timeout.Infinite);
        }
    }
}

private void btnNext_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    if (doubleClickTimer != null)
        doubleClickTimer.Change(Timeout.Infinite, Timeout.Infinite);    // disable it - I've tried it with and without this line
        doubleClickTimer.Dispose();
    doubleClickTimer = null;

    //.... DO THE DOUBLE CLICK ACTION
}

问题是双击时"双击"动作后的"单击动作".奇怪的是,我doubleClickTimer在双击时将delayedBtnClick其设置为null,但是它是真的:O

我已经尝试过更长的时间,一个布尔旗和锁......

你有什么想法？

最好!

Answer 1

如果你在处理事件之后将RoutedEvent's 设置e.Handled为true,MouseDoubleClick那么它将不会Click在第二次之后调用事件MouseDoubleClick.

有一个最近的文章这倒是有不同的行为对SingleClick和DoubleClick这可能是有用的.

但是,如果您确定需要单独的行为并希望/需要阻止第一行Click和第二行Click,您可以使用DispatcherTimer您喜欢的行为.

private static DispatcherTimer myClickWaitTimer = 
    new DispatcherTimer(
        new TimeSpan(0, 0, 0, 1), 
        DispatcherPriority.Background, 
        mouseWaitTimer_Tick, 
        Dispatcher.CurrentDispatcher);

private void Button_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    // Stop the timer from ticking.
    myClickWaitTimer.Stop();

    Trace.WriteLine("Double Click");
    e.Handled = true;
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    myClickWaitTimer.Start();
}

private static void mouseWaitTimer_Tick(object sender, EventArgs e)
{
    myClickWaitTimer.Stop();

    // Handle Single Click Actions
    Trace.WriteLine("Single Click");
}

Answer 2

你可以试试这个:

Button.MouseLeftButtonDown += Button_MouseLeftButtonDown;

private void Button_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    e.Handled = true;

    if (e.ClickCount > 1)
    {
        // Do double-click code
    }

    else
    {
        // Do single-click code
    }
}

如果需要,您可能需要单击鼠标并等待鼠标向上执行操作.