MasterDetailPage.xaml

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<Page x:Class="RssReader.Views.MasterDetailPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:local="using:RssReader.Views"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      xmlns:MUXC="using:Microsoft.UI.Xaml.Controls"
      mc:Ignorable="d"
      NavigationCacheMode="Required"
      Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Page.Transitions>
        <TransitionCollection>
            <NavigationThemeTransition />
        </TransitionCollection>
    </Page.Transitions>

    <Grid x:Name="LayoutRoot">
        <VisualStateManager.VisualStateGroups>
            <VisualStateGroup x:Name="AdaptiveStates"
                              CurrentStateChanged="AdaptiveStates_CurrentStateChanged">
                <VisualState x:Name="DefaultState">
                    <VisualState.StateTriggers>
                        <AdaptiveTrigger MinWindowWidth="720" />
                    </VisualState.StateTriggers>
                </VisualState>
                <VisualState x:Name="NarrowState">
                    <VisualState.StateTriggers>
                        <AdaptiveTrigger MinWindowWidth="0" />
                    </VisualState.StateTriggers>
                    <VisualState.Setters>
                        <Setter Target="MasterColumn.Width"
                                Value="*" />
                        <Setter Target="DetailColumn.Width"
                                Value="0" />
                    </VisualState.Setters>
                </VisualState>
            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>

        <Grid.ColumnDefinitions>
            <ColumnDefinition x:Name="MasterColumn"
                              Width="360" />
            <ColumnDefinition x:Name="DetailColumn"
                              Width="*" />
        </Grid.ColumnDefinitions>

        <Frame x:Name="MasterFrame" />

        <MUXC:ProgressBar x:Name="LoadingProgressBar"
                     Visibility="Collapsed"
                     Grid.Column="1"
                     Margin="24,8"
                     IsIndeterminate="True"
                     Style="{ThemeResource ProgressBarStyle1}" />

        <WebView x:Name="ArticleWebView"
                 Grid.Column="1"
                 Visibility="Collapsed" />

    </Grid>
</Page>