CategoriesChooserDialog.xaml

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<ContentDialog
    x:Class="PhotoSharingApp.Universal.Views.CategoriesChooserDialog"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:PhotoSharingApp.Universal.Views"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:design="using:PhotoSharingApp.Universal.ViewModels.Design"
    xmlns:valueConverters="using:PhotoSharingApp.Universal.ValueConverters"
    xmlns:controls="using:PhotoSharingApp.Universal.Controls"
    mc:Ignorable="d"
    Title="Choose Category"
    PrimaryButtonText="ok"
    PrimaryButtonClick="OkButtonClick"
    SecondaryButtonText="cancel"
    SecondaryButtonClick="CancelButtonClick"
    d:DataContext="{d:DesignInstance design:CategoriesChooserDesignViewModel, IsDesignTimeCreatable=True}"
    FullSizeDesired="True"
    Template="{StaticResource ListContentDialogTemplate}"
    Background="White">
    <ContentDialog.Resources>
        <valueConverters:InverseBooleanConverter x:Key="InverseBooleanConverter" />
        <valueConverters:NullToBoolConverter x:Key="NullToBoolConverter" />
        <valueConverters:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
    </ContentDialog.Resources>
    <ContentDialog.IsPrimaryButtonEnabled>
        <Binding Path="SelectedCategory" Converter="{StaticResource NullToBoolConverter}" />
    </ContentDialog.IsPrimaryButtonEnabled>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition />
        </Grid.RowDefinitions>
        <Grid Margin="0,6,0,0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>

            <Button Grid.Column="1" Command="{Binding AddCategoryCommand}">
                <SymbolIcon Symbol="Add" />
            </Button>

            <TextBox x:Name="searchTextBox" PlaceholderText="Search"
                     Text="{Binding SearchText, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
                     IsEnabled="{Binding IsBusy, Converter={StaticResource InverseBooleanConverter}}"
                     Margin="0,0,12,0" />
        </Grid>

        <Grid Row="1">
            <ListView ItemsSource="{Binding FilteredCategories}"
                      SelectedItem="{Binding SelectedCategory, Mode=TwoWay}">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <controls:MyControl Margin="0,0,6,0" />
                            <TextBlock Text="{Binding Name}" VerticalAlignment="Center" />
                        </StackPanel>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </Grid>
        <Grid Background="{StaticResource BusyIndicatorBackgroundColorBrush}" Grid.Row="1"
              Visibility="{Binding IsBusy, Converter={StaticResource BooleanToVisibilityConverter}}">
            <ProgressRing IsActive="{Binding IsBusy}" />
        </Grid>
    </Grid>
</ContentDialog>