win10 UWP 全屏

win10 可以全屏软件或窗口，窗口有一般、最小化、最大化。我们有新的API设置我们软件是全屏，是窗口。我们可以使用ApplicationView让我们软件全屏，取消。
下面是一个简单的例子，判断我们软件是不是全屏，如果是，就不全屏，代码在一个ToggleButton

ApplicationView view = ApplicationView.GetForCurrentView();

bool isInFullScreenMode = view.IsFullScreenMode;

if (isInFullScreenMode)  
{
    view.ExitFullScreenMode();
}
else  
{
    view.TryEnterFullScreenMode();
}

IsFullScreenMode为true，现在应用全屏
ExitFullScreenMode退出全屏
TryEnterFullScreenMode进入全屏，进入全屏成功true
如果窗口改变需要知道，可以注册Window.Current.SizeChanged

public class IsFullScreenModeTrigger : StateTriggerBase  
{
    public IsFullScreenModeTrigger()
    {
        ApplicationView view = ApplicationView.GetForCurrentView();

        SetActive(view.IsFullScreenMode);

        Window.Current.SizeChanged += CurrentWindow_SizeChanged;
    }

    private void CurrentWindow_SizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e)
    {
        ApplicationView view = ApplicationView.GetForCurrentView();

        SetActive(view.IsFullScreenMode);
    }
}

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">  
    <VisualStateManager.VisualStateGroups>
        <VisualStateGroup>
            <VisualState x:Name="InFullScreen">
                <VisualState.StateTriggers>
                    <local:IsFullScreenModeTrigger />
                </VisualState.StateTriggers>
                <VisualState.Setters>
                    <Setter Target="IsFullScreenText.Text" Value="In full screen mode" />
                </VisualState.Setters>
            </VisualState>
        </VisualStateGroup>
    </VisualStateManager.VisualStateGroups>
    <StackPanel HorizontalAlignment="Center">
        <Button Click="Button_Click" 
                Content="Toggle full screen"></Button>
        <TextBlock x:Name="IsFullScreenText" 
                    FontSize="72" 
                    TextWrapping="Wrap" 
                    Text="Not in full screen mode"/>
    </StackPanel>
</Grid>  

在我们应用变为全屏，textblock就会In full screen mode

我们可以设置PreferredLaunchWindowingMode，在我们应用打开

ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.FullScreen;

ApplicationViewWindowingMode可以Auto ,PreferredLaunchViewSize设置窗口和ApplicationView.PreferredLaunchViewSize，如果没有设置ApplicationView.PreferredLaunchViewSize会使用上次关闭窗口， FullScreen

win10有很简单的API可以应用全屏，在电脑，我们经常用窗口，手机经常使用全屏。

http://igrali.com/2015/06/21/full-screen-mode-in-windows-10-universal-apps/