I would like to make a UserControl which have a DataTemplate, and inside that DataTemplate there are controls. I would like to bind to those nested (inside the DataTemplate) controls' properties so I can set them when I reuse this UserControl. The nested controls will use the ItemSource's properties but the property names of the ItemSource's properties could be different.
The UserControl:
<UserControl x:Class="ContextMenu.BaseFilterUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
x:Name="Self">
<Grid Margin="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="80" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="70" />
</Grid.RowDefinitions>
<TextBlock Grid.Column="0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Margin="10"
Text="Owners" />
<Button Grid.Column="1"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Margin="10"
Click="FilteButtonClicked"
Width="40"
Height="40"
x:Name="FilterButton">
<Popup x:Name="FilterBoxPopup"
PlacementTarget="{Binding ElementName=FilterButton}"
Placement="Bottom"
StaysOpen="False">
<Border BorderBrush="Black"
Background="White"
Margin="2">
<ListView ItemsSource="{Binding ElementName=Self, Path=FilterList}"
x:Name="FilterListView"
Height="300"
Width="150">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<!--<CheckBox IsChecked="{Binding IsChecked}" />-->
<!--<TextBlock Text="{Binding Name}" />-->
<!--This is where I don't know how to properly bind eg. the above control, things I tried:-->
<!--<TextBlock Text="{Binding ElementName=FilterListView, Path=FilterElementName}" />-->
<!--<TextBlock Text="{Binding ElementName=Self, Path=DataContext.FilterElementName}" />-->
<!--<TextBlock Text="{Binding ElementName=FilterListView, Path=DataContext.FilterElementName}" />-->
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Border>
</Popup>
</Button>
<TextBlock Grid.Column="3"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="10"
Text="{Binding ElementName=Self, Path=SelectedNames}" />
</Grid>
</UserControl>
This how the UserControl is used, the FilterElementName="Name" is what I would like to set, depending on the list binded with FilterList list:
<local:BaseFilterUserControl FilterList="{Binding Owners}"
FilterElementName="Name"
SelectedNames="{Binding SelectedNames}"/>
In this case the Owners is a simple IReadOnlyList of an Owner class. The Owner class has a string Name property. But I will use this UserControl again with different list eg. where I would like to use the Versions list's Release property (for the TextBlock inside the UserControl):
<local:BaseFilterUserControl FilterList="{Binding Versions}"
FilterElementName="Release"
SelectedNames="{Binding SelectedReleases}"/>
The ListView is properly populated with items, so the FilterList DependencyProperty is working. But the nested controls are only working when I hard code the bindings:
<TextBlock Text="{Binding Name}" />
For this to work you would need to bind the Path-property of your TextBlocks Text-Binding to the FilterElementName property of your UserControl. Unfortunately the Path property of the Binding class is not a DependencyProperty and therefore not bindable.
One way to to achieve your goal would be to use the DisplayMemberPath property of the ListView, which is bindable:
<ListView x:Name="FilterListView"
Width="150"
Height="300"
ItemsSource="{Binding ElementName=Self, Path=FilterList}"
DisplayMemberPath="{Binding ElementName=self, Path=FilterElementName}"/>
If this approach does not work because you need to specify a more complex ItemTemplate, another way would be create a property of type DataTemplate in your UserControl, use that as ItemTemplate in the ListView and specify it from outside like so:
<local:BaseFilterUserControl FilterList="{Binding Versions}"
SelectedNames="{Binding SelectedReleases}">
<local:BaseFilterUserControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Release}" />
</DataTemplate>
</local:BaseFilterUserControl.ItemTemplate>
</local:BaseFilterUserControl>