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Implement Custom Filtering


The Filter Guid Editing is based on four different xaml parts:

  • Input field
  • EvalExpression
  • ListCollectionView
  • ListView


With this Filter, we are able to filter in a Guid Editor dynamically without using any evaluate button or something, you just input a value that you want to filter with and it will directly output you any item that contains the filter input.

Input field

The input field is just a basic Textbox we are gonna using for inputting the filter criteria value.

It will look like this:

UWP

<Grid>
      <!--  Type / Content / Buttons  -->
      <Grid.ColumnDefinitions>
             <ColumnDefinition Width="60" />
             <ColumnDefinition Width="2*" />
       </Grid.ColumnDefinitions>

      <TextBlock Margin="0,0,0,0"
           Grid.Column="0">
            <Run Text="Name:"/>
      </TextBlock>

     <!--  Textbox for editing  -->
     <TextBox x:Name="InputTextboxName"
          Grid.Column="1"
          Margin="0,0,0,0">
     </TextBox>
</Grid>

Xamarin

<Entry x:Name="Filter_Input"
    Margin="2,2,2,2"
    HeightRequest="40"
    HorizontalOptions="Start"
    WidthRequest="400"
    Placeholder="Name...">
</Entry>


EvalExpression

With this EvalExpression, we are able to combine the Input text field with the value parameter (property from the item we want to filter).

Here is the final XAML EvalExpression solution:

UWP

<controls:EvalExpression x:Name="FilterExpression"
               Context="{Binding}"
               Expression="FC1">
                    <controls:EvalExpressionParameter Name="FC1"
                   Value="{Binding ElementName=InputTextboxName, Path=Text, Converter={StaticResource StringFormatConverter}, ConverterParameter='Item.Values[&quot;NAME&quot;].ToLower().Contains(&quot;{0}&quot;.ToLower())==true'}" />
            </controls:EvalExpression>

Xamarin

<controls:EvalExpression x:Key="FilterExpression" Expression="(P1==null||P1==&quot;&quot;)?&quot;true&quot;:P0" Context="{Binding}">
         <controls:EvalExpressionParameter Name="P0" Value="{Binding Path=Text, Source={x:Reference Filter_Input}, Converter={StaticResource Formatter}, ConverterParameter='Item.Values[&quot;NAME&quot;].ToLower().Contains(&quot;{0}&quot;.ToLower())==true'}" />
         <controls:EvalExpressionParameter Name="P1" Value="{Binding Path=Text, Source={x:Reference Filter_Input}}" />
</controls:EvalExpression>

The best solution would be to place this eval expression into the <Grid.Resources>.

Used namespace:

UWP

xmlns:controls="using:UBIK.WinX.Controls"

Xamarin

xmlns:controls="clr-namespace:UBIK.CPL.Controls;assembly=UBIK.CPL"


ListCollectionView

To really get used to this EvalExpression we also need to configure a ListCollectionView, that would look like this:

UWP

<cv:ListCollectionView x:Key="FilterView"
               Expression="{Binding ElementName=FilterExpression, Path=Result}"
               ItemsSource="{Binding Children.Items}" />

Xamarin

<controls:SfDataSourceExt x:Key="FilterView"
       Expression="{Binding Path=Result, Source={StaticResource FilterExpression}}"
       ItemsSource="{Binding Children.Items}" />

Used namespace:

UWP

xmlns:cv="using:UBIK.WinX.UI.CollectionView"

Xamarin

xmlns:controls="clr-namespace:UBIK.CPL.Controls;assembly=UBIK.CPL"


ListView control

The ListView is for using the filtered results, in this example a SelectionBoundListView is used but could also be any other control list view.

UWP

<controls:SelectionBoundListView
               x:Name="FilterQueryList"
               ItemTemplate="{Binding PropertyViewModel.TemplateService[UBIKInlineQueryResultItem]}"
               ItemsSource="{StaticResource FilterView}"
               SelectedValue="{Binding PropertyValue}"
               SelectionMode="Single"
               Visibility="{Binding PropertyViewModel.FilterQuery, Converter={StaticResource NullObjectToCollapsedConverter}}">
                <Interactivity:Interaction.Behaviors>
                    <behaviors:UserSelectionChangedBehavior>
                        <Core:InvokeCommandAction Command="{Binding PropertyViewModel.SetPropertyValueCommand}"
                           CommandParameter="{Binding ElementName=FilterQueryList, Path=SelectedValue}" />
                    </behaviors:UserSelectionChangedBehavior>
                </Interactivity:Interaction.Behaviors>
</controls:SelectionBoundListView>

Xamarin

<controls:SfListViewExt
               x:Name="FilterQueryResultList"
               BackgroundColor="White"
               IsVisible="{Binding PropertyViewModel.ShowComboBox, Converter={StaticResource BoolToNotBool}, FallbackValue=false, TargetNullValue=false}"
               ItemSize="60"
               ItemTemplate="{StaticResource EditorFilterQueryItemTemplate}"
               ItemsSource="{Binding DisplayItems, Source={StaticResource FilterView}}"
               SelectedItem="{Binding PropertyViewModel.ValueItem.PropertyValue, Mode=OneWay, Converter={StaticResource GuidPropertyValue}, ConverterParameter={Binding Source={x:Reference FilterQueryResultList}}}"
               SelectionMode="Single"
               SelectionBackgroundColor="{StaticResource UBIKAccentColor}" />

See also