飞到Appbar后面

Question

当您希望应用程序扩展到全屏(包括状态栏和应用程序栏)时，您必须这样做：

var applicationView = Windows.UI.ViewManagement.ApplicationView.GetForCurrentView();
applicationView.SetDesiredBoundsMode(Windows.UI.ViewManagement.ApplicationViewBoundsMode.UseCoreWindow);

然后，如果您想在应用程序中的任何地方或应用程序中的任何地方进行飞出，它们将显示在appbar后面：

    <Page.BottomAppBar>
        <CommandBar>
            <AppBarButton Icon="Preview" Label="Preview">
                <AppBarButton.Flyout>
                    <MenuFlyout>
                        <MenuFlyoutItem Text="Fit width" />
                        <MenuFlyoutItem Text="Fit height" />
                        <MenuFlyoutItem Text="Fit page" />
                    </MenuFlyout>
                </AppBarButton.Flyout>
            </AppBarButton>
        </CommandBar>
    </Page.BottomAppBar>

结果：

​

​

在列表视图中的项目上，也会出现同样的情况。它们将显示在应用程序栏后面：

​

​

如何在应用程序的顶部显示闪光灯？

Answer 1

我似乎不能解决我的问题(或谁可以帮助)。所以我就这么做了，如果它能帮到某人：

<Page.BottomAppBar>
        <CommandBar>
            <AppBarButton Icon="Preview" Label="Preview">
                <AppBarButton.Flyout>
                    <MenuFlyout Opened="MenuFlyout_Opened" Closed="MenuFlyout_Closed">
                        <MenuFlyoutItem Text="Fit width" />
                        <MenuFlyoutItem Text="Fit height" />
                        <MenuFlyoutItem Text="Fit page" />
                    </MenuFlyout>
                </AppBarButton.Flyout>
            </AppBarButton>
        </CommandBar>
    </Page.BottomAppBar>

private void MenuFlyout_Opened(object sender, object e)
{
  BottomAppBar.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
}

private void MenuFlyout_Closed(object sender, object e)
{
  BottomAppBar.Visibility = Windows.UI.Xaml.Visibility.Visible;
}

现在，我的飞出完全出现了，因为没有更多的应用程序。对于mvvm列表视图项，我是在行为操作中这样做的：

<DataTemplate x:Key="MvvmItemTemplate">
        <Grid>

            <i:Interaction.Behaviors>
                <icore:EventTriggerBehavior EventName="Holding">
                    <local:OpenFlyoutAction />
                </icore:EventTriggerBehavior>
            </i:Interaction.Behaviors>

            <FlyoutBase.AttachedFlyout>
                <MenuFlyout>
                    <MenuFlyoutItem ..... Command="{Binding MarkRead}" />
                    <MenuFlyoutItem ..... Command="{Binding MarkUnread}" />
                    <MenuFlyoutItem ..... Command="{Binding PinToStart}" />
                </MenuFlyout>
            </FlyoutBase.AttachedFlyout>
        </Grid>
    </DataTemplate>




public class OpenFlyoutAction : DependencyObject, IAction
    {
        public object Execute(object sender, object parameter)
        {
            // Show menu
            FlyoutBase.ShowAttachedFlyout((FrameworkElement)sender);

            // sometimes the appbar is stuck behind the appbar, so hide the appbar
            (sender as FrameworkElement).GetFirstAncestorOfType<Page>().BottomAppBar.Visibility = Visibility.Collapsed;

            // show the appbar again when flyout is closed
            var flyout = FlyoutBase.GetAttachedFlyout((FrameworkElement)sender);
            EventHandler<object> showBar = null;
            showBar = delegate (object s, object e)
            {
                (sender as FrameworkElement).GetFirstAncestorOfType<Page>().BottomAppBar.Visibility = Visibility.Visible;
                // unsubscribe handler:
                flyout.Closed -= showBar;
            };
            flyout.Closed += showBar;

            return null;
        }
    }