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App.xaml.cs
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/
App.xaml.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Core;
using Windows.UI.Xaml.Navigation;
using Windows.Storage;
using APP.View;
using APP.Model;
namespace APP
{
/// <summary>
/// 提供特定于应用程序的行为，以补充默认的应用程序类。
/// </summary>
sealed partial class App : Application
{
/// <summary>
/// 初始化单一实例应用程序对象。这是执行的创作代码的第一行，
/// 已执行，逻辑上等同于 main() 或 WinMain()。
/// </summary>
///
public App()
{
this.InitializeComponent();
this.Suspending += OnSuspending;
}
/// <summary>
/// 在应用程序由最终用户正常启动时进行调用。
/// 将在启动应用程序以打开特定文件等情况下使用。
/// </summary>
/// <param name="e">有关启动请求和过程的详细信息。</param>
protected async override void OnLaunched(LaunchActivatedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
Windows.UI.Core.SystemNavigationManager.GetForCurrentView().BackRequested += BackRequested;
// 不要在窗口已包含内容时重复应用程序初始化，
// 只需确保窗口处于活动状态
if (rootFrame==null)
{
// 创建要充当导航上下文的框架，并导航到第一页
rootFrame = new Frame();
rootFrame.NavigationFailed += OnNavigationFailed;
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: 从之前挂起的应用程序加载状态
}
else if (e.PreviousExecutionState == ApplicationExecutionState.Suspended)
{
}
// 将框架放在当前窗口中
Window.Current.Content = rootFrame;
await NameMap.Read();
}
if (e.PrelaunchActivated == false)
{
if (rootFrame.Content == null)
{
// 当导航堆栈尚未还原时，导航到第一页，
// 并通过将所需信息作为导航参数传入来配置
// 参数
rootFrame.Navigate(typeof(MainPage), e.Arguments);
}
// 确保当前窗口处于活动状态
Window.Current.Activate();
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = rootFrame.CanGoBack ?
AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;
rootFrame.Navigated += OnNavigated;
}
}
/// <summary>
/// 导航到特定页失败时调用
/// </summary>
///<param name="sender">导航失败的框架</param>
///<param name="e">有关导航失败的详细信息</param>
void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
}
/// <summary>
/// 在将要挂起应用程序执行时调用。 在不知道应用程序
/// 无需知道应用程序会被终止还是会恢复，
/// 并让内存内容保持不变。
/// </summary>
/// <param name="sender">挂起的请求的源。</param>
/// <param name="e">有关挂起请求的详细信息。</param>
private async void OnSuspending(object sender, SuspendingEventArgs e)
{
var deferral = e.SuspendingOperation.GetDeferral();
//TODO: 保存应用程序状态并停止任何后台活动
deferral.Complete();
}
private async void EnteredBackground(object sender,EnteredBackgroundEventArgs e)
{
await NameMap.TextWrapping();
}
private void OnNavigated(object sender, NavigationEventArgs e)
{
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = ((Frame)sender).CanGoBack ?
AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;
}
private void BackRequested(object sender, Windows.UI.Core.BackRequestedEventArgs e)
{
if (!(Window.Current.Content is Frame rootFrame))
{
return;
}
if (rootFrame.CanGoBack && e.Handled == false)
{
e.Handled = true;
rootFrame.GoBack();
}
}
}
}