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wp8.1 app退出操作提示

2024-07-08 03:23:57   237人阅读

微软的wp8.1 sdk相比之前wp8 sdk以及相关dll类库，微软又重新编译过，相关系统类库也经过精简，删改了部分传统dll库中的方法对象，很多常用方法对象被写进Windows.UI为前缀的命名空间中，可以看出微软wp8.1经过了一定的优化。

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此处功能设计描述为，触摸一次返回键，提示是否退出app，再点一次即关闭app。

1 <Grid Background="#F5F5F5" DataContext="{Binding Path=MainPageViewModel, Source={StaticResource Locator}}">2     <Grid Canvas.ZIndex="10000" Visibility="{Binding ExitNotificationVisible}" Height="30" Background="Red" VerticalAlignment="Top">3         <TextBlock FontSize="14" Text="提示: 再按一次返回键退出支付宝" VerticalAlignment="Center" Margin="10 0 0 0" />4     </Grid>5     <ContentControl HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" Content="{Binding DynamicContent}" />6 </Grid>

 

1 using System;2 using Windows.UI.Xaml;3 using Windows.UI.Xaml.Controls;4 using Windows.UI.Popups;

 

 1 public class MainPageViewModel : Core.ViewModelBase 2 { 3     public MainPageViewModel() 4     { 5         InitData(); 6         if(DynamicContent == null) 7         { 8             DynamicContent = ViewControlLocator.Instance.RegisterViewControl<HomePage, HomePageViewModel>(true); 9         }10         //---物理返回键api---11         Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;12     }13 14     #region  attribute15     //---计时器---16     DispatcherTimer timer = null;17     int timesToTick = 2;18 19     private UserControl m_DynamicContent;20     public UserControl DynamicContent21     {22         get { return m_DynamicContent; }23         set { m_DynamicContent = value; RaisePropertyChanged("DynamicContent"); }24     }25 26     private Visibility m_ExitNotificationVisible;27     public Visibility ExitNotificationVisible28     {29         get { return m_ExitNotificationVisible; }30         set { m_ExitNotificationVisible = value; RaisePropertyChanged("ExitNotificationVisible"); }31     }32     #endregion33     34     #region  method35     private void InitData()36     {37         ExitNotificationVisible = Visibility.Collapsed;38     }39 40     //---关闭事件---41     void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)42     {43         e.Handled = true;44         if (ExitNotificationVisible == Visibility.Collapsed)45         {46             ExitNotificationVisible = Visibility.Visible;47 48             if(timer == null)49             {50                 timer = new DispatcherTimer();51             }                52             timer.Interval = TimeSpan.FromSeconds(2);53             timer.Tick += timer_Tick;54             timer.Start();55         }56         else57         {58             App.Current.Exit();59         }60     }61 62     //---到时没有执行关闭操作，隐藏关闭操作提示---63     void timer_Tick(object sender, object e)64     {65         timesToTick--;66         if (timesToTick == 0)67         {68             timesToTick = 2;69             timer.Tick -= timer_Tick;70             timer.Stop();71             ExitNotificationVisible = Visibility.Collapsed;  72         }73     }74     #endregion75 }


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