Windows 10 Creaters Update 新功能——畫中畫模式和窗口高斯模糊

在Windows 10 Creaters Update中，能夠給窗口設置高斯模糊了，只要幾行代碼！

    <Grid   Loaded="Grid_Loaded">
        <Grid x:Name="mg"></Grid>
        <Grid Background="Blue" Opacity="0.4" x:Name="rootGrid" ></Grid>
        <!--your uielements-->
    </Grid>

        Windows.UI.Composition.Compositor _compositor;
        Windows.UI.Composition.SpriteVisual _hostSprite;
        public MainPage()
        {
            this.InitializeComponent();
            _compositor = Windows.UI.Xaml.Hosting.ElementCompositionPreview.GetElementVisual(this).Compositor;
        }

        private void Grid_Loaded(object sender, RoutedEventArgs e)
        {
            _hostSprite = _compositor.CreateSpriteVisual();
            _hostSprite.Size = new System.Numerics.Vector2((float)rootGrid.ActualWidth, (float)rootGrid.ActualHeight);

            ElementCompositionPreview.SetElementChildVisual(mg, _hostSprite);
            _hostSprite.Brush = _compositor.CreateHostBackdropBrush();
        }

效果

 

XAML裏的那個Grid的顏色是能夠換的，刪了也行。那個是爲了實現向開始菜單那樣特定顏色的模糊。

不過這個方法在新增長的畫中畫模式無效

關於如何實現畫中畫其實很簡單

檢測是否支持畫中畫

ApplicationView.GetForCurrentView().IsViewModeSupported(ApplicationViewMode.CompactOverlay)

進入畫中畫

bool modeSwitched = await ApplicationView.GetForCurrentView().TryEnterViewModeAsync(ApplicationViewMode.CompactOverlay);

    ViewModePreferences compactOptions = ViewModePreferences.CreateDefault(ApplicationViewMode.CompactOverlay);
    compactOptions.CustomSize = new Windows.Foundation.Size(320, 200);//你要的窗口大小
    bool modeSwitched = await ApplicationView.GetForCurrentView().TryEnterViewModeAsync(ApplicationViewMode.Default, compactOptions);

退出畫中畫

bool modeSwitched = await ApplicationView.GetForCurrentView().TryEnterViewModeAsync(ApplicationViewMode.Default);

也能夠結合UWP的多窗口功能

await CoreApplication.CreateNewView().Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
    {
        var frame = new Frame();
        compactViewId = ApplicationView.GetForCurrentView().Id;
        frame.Navigate(typeof(SecondaryCompactViewPage));
        Window.Current.Content = frame;
        Window.Current.Activate();
        ApplicationView.GetForCurrentView().Title = "畫中畫窗口";
    });
    bool viewShown = await ApplicationViewSwitcher.TryShowAsViewModeAsync(compactViewId, ApplicationViewMode.CompactOverlay);

微軟的多窗口示例：https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/MultipleViews

微軟關於畫中畫功能的介紹：https://blogs.msdn.microsoft.com/universal-windows-app-model/2017/02/11/compactoverlay-mode-aka-picture-in-picture/

我還作了一個完整的示例，能夠在這裏下載https://git.oschina.net/PixeezPlus/Sharp2DDemo/tree/master/GaussianBlurWindow

還有一點須要注意，就是這些代碼只在PC的Creaters Update以上版本有效