MainPage.xaml

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    <Page
    x:Class="PhotoEditor.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:PhotoEditor"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    NavigationCacheMode="Enabled"
    RequestedTheme="Dark">
    <Page.Resources>

        <!-- Margins for grid items -->
        <x:Int32 x:Key="LargeItemMarginValue">4</x:Int32>
        <Thickness x:Key="LargeItemMargin">4</Thickness>
        <x:Int32 x:Key="DesktopWindowSidePaddingValue">16</x:Int32>

        <ItemsPanelTemplate x:Key="ImageGridView_ItemsPanelTemplate">
            <ItemsWrapGrid Orientation="Horizontal"
                           HorizontalAlignment="Center" />
        </ItemsPanelTemplate>

        <DataTemplate x:Key="ImageGridView_DefaultItemTemplate"
                      x:DataType="local:Photo">
            <Image x:Name="ItemImage"
                       Stretch="Uniform"
                       Opacity="0" 
                       Height="200"
                       Width="300"
                       Margin="{StaticResource LargeItemMargin}">
                <ToolTipService.ToolTip>
                    <ToolTip Content="{x:Bind ImageTitle, Mode=OneWay}"/>
                </ToolTipService.ToolTip>
            </Image>
        </DataTemplate>
        

        <Style x:Key="ImageGridView_DefaultItemContainerStyle"
               TargetType="GridViewItem">
            <Setter Property="Margin"
                    Value="{StaticResource LargeItemMargin}" />
        </Style>

        <DataTemplate x:Key="ImageGridView_MobileItemTemplate"
                      x:DataType="local:Photo">
            <Grid Height="100"
                  Width="100">
                <Image x:Name="ItemImage"
                       Stretch="UniformToFill"
                       Opacity="0">
                    <ToolTipService.ToolTip>
                        <ToolTip x:Name="tooltip">
                            <StackPanel Orientation="Vertical"
                                        Grid.Row="1">
                                <TextBlock Text="{x:Bind ImageTitle, Mode=OneWay}"
                                           HorizontalAlignment="Center"
                                           Style="{StaticResource SubtitleTextBlockStyle}" />
                                <StackPanel Orientation="Horizontal"
                                            HorizontalAlignment="Center">
                                    <TextBlock Text="{x:Bind ImageFileType}"
                                               HorizontalAlignment="Center"
                                               Style="{StaticResource CaptionTextBlockStyle}" />
                                    <TextBlock Text="{x:Bind ImageDimensions}"
                                               HorizontalAlignment="Center"
                                               Style="{StaticResource CaptionTextBlockStyle}"
                                               Margin="8,0,0,0" />
                                </StackPanel>
                            </StackPanel>
                        </ToolTip>
                    </ToolTipService.ToolTip>
                </Image>
            </Grid>
        </DataTemplate>

        <Style x:Key="ImageGridView_MobileItemContainerStyle"
               TargetType="GridViewItem" />

    </Page.Resources>

    <RelativePanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <TextBlock x:Name="TitleTextBlock"
                   Text="Collection"
                   Style="{StaticResource TitleTextBlockStyle}"
                   Margin="24,0,0,24" />

        <CommandBar x:Name="MainCommandBar"
                    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
                    RelativePanel.AlignRightWithPanel="True"
                    OverflowButtonVisibility="Collapsed"
                    DefaultLabelPosition="Right">

        </CommandBar>

        <ProgressBar x:Name="LoadProgressIndicator" Margin="0,-10,0,0"
                     IsIndeterminate="True" Visibility="Visible"
                     RelativePanel.AlignLeftWithPanel="True"
                     RelativePanel.AlignRightWithPanel="True"
                     RelativePanel.Below="TitleTextBlock"/>

        <Grid RelativePanel.AlignLeftWithPanel="True"
              RelativePanel.AlignRightWithPanel="True"
              RelativePanel.Below="LoadProgressIndicator">
            <ParallaxView x:Name="ParaView" VerticalShift="50">

                <!--Background element-->
                <Image x:Name="BackgroundImage" Source="Assets/bg1.png"
               Stretch="UniformToFill"/>
            </ParallaxView>

            <!--Foreground element-->
            <ScrollViewer x:Name="ForegroundElement">

                <GridView x:Name="ImageGridView"
                  Margin="0,0,0,8"
                  ItemClick="ImageGridView_ItemClick"
                  IsItemClickEnabled="True"
                  ItemsSource="{x:Bind Photos, Mode=OneWay}"
                  RelativePanel.AlignLeftWithPanel="True"
                  RelativePanel.AlignRightWithPanel="True"
                  RelativePanel.Below="TitleTextBlock"
                  Loaded="{x:Bind StartConnectedAnimationForBackNavigation}"
                  ItemsPanel="{StaticResource ImageGridView_ItemsPanelTemplate}"
                  ItemTemplate="{StaticResource ImageGridView_DefaultItemTemplate}"

                  ContainerContentChanging="OnContainerContentChanging">
                </GridView>

            </ScrollViewer>
            
            <TextBlock x:Name="NoPicsText" Text="Sorry, we couldn't find any images in your Pictures library. Please add some pictures to your library and relaunch the app."
                       HorizontalAlignment="Center" Margin="0,100,0,0"
                       Foreground="White" Visibility="Collapsed"/>
            
        </Grid>
    </RelativePanel>
</Page>