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用threading.timer来控制前台textblock会出现闪现 RRS feed

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  • 问题

  • Question
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    我想要做这样一个效果，利用timer来实现textblock显示N秒后消失（collapse），但我在运行过程中出现闪现，请各位大大帮忙看下是什么问题？

            private void TextBlock_PointerEntered(object sender, PointerRoutedEventArgs e)
        {
            (sender as TextBlock).Foreground = new SolidColorBrush(Colors.Yellow);
            Warnning("Holding item to delete.");
        }

        private void Warnning(string str) {
            warning.Visibility = Visibility.Visible;
            warning.Text = str;
            timer = new Timer(new TimerCallback(async (object state) =>
            {
                TextBlock warn = state as TextBlock;
                await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, 
                    () => { warn.Visibility = Visibility.Collapsed; });
                timer.Dispose();
            }), warning, 0, 10000);
        }

    2015年9月26日 13:44

答案

  • Question
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    你好，

    >>”利用timer来实现textblock显示N秒后消失”

    在Winrt中，如果你需要跟UI进行交互的话，你可以使用DispatcherTimer来实现这个功能，具体信息可以参考微软官方文档：https://msdn.microsoft.com/zh-cn/library/windows/apps/windows.ui.xaml.dispatchertimer

    这里我做了个sample，供你参考：

    DispatcherTimer timer;
        int count = 0;
        string str = "Holding item to delete.";
        public MainPage()
        {
            this.InitializeComponent();
        }

        private void TextBlock_PointerEntered(object sender, PointerRoutedEventArgs e)
        {
            (sender as TextBlock).Foreground = new SolidColorBrush(Colors.Yellow);
            timer = new DispatcherTimer();
            timer.Tick += timer_Tick;
            timer.Interval = new TimeSpan(0,0,1);
            count = 10;
            timer.Start();

        }

        void timer_Tick(object sender, object e)
        {
            if (count == 0)
            {
                timer.Stop();
                warning.Visibility = Visibility.Collapsed;
            }
            else
            {
                warning.Visibility = Visibility.Visible;
                warning.Text = str + count;
                count--;
            }
        }

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    2015年9月28日 10:00