I need to find the LongListMultiSelector inside ListBox .
<ListBox x:Name="ListBoxName" Width="400">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<Bewise:ExpanderControl x:Name="bewiseControl" HeaderText="{Binding Title, Mode=OneWay}" Width="400" >
<Bewise:ExpanderControl.ContentArea>
<toolkit:LongListMultiSelector ItemsSource="{Binding LstProdcuts}" x:Name="LongList">
<toolkit:LongListMultiSelector.ItemTemplate >
<DataTemplate>
<StackPanel >
<TextBlock Text="{Binding Title}" />
</StackPanel>
</DataTemplate>
</toolkit:LongListMultiSelector.ItemTemplate>
</toolkit:LongListMultiSelector>
</Bewise:ExpanderControl.ContentArea>
</Bewise:ExpanderControl>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
i need to access LongList inside ListBoxName.I needed this LongList to get the selected item and itemSource or to add item to the selecteditem of the list
You could use the VisualTreeHelper class in order to access elements within.
Example!
Related
When an item is selected in my ListView, I want to display a specific user control in the my ContentControl.
Using the following code, my content control merely displays "Microsoft.UI.Xaml.Data.CollectionView". I understand the ContentControl is trying to bind to the entire list, but how do I tell it to bind to the CollectionViewSource's CurrentItem?
<Page.Resources>
<CollectionViewSource x:Name="PChoicesCollectionView" Source="{x:Bind ViewModel.PChoices}"/>
</Page.Resources>
<ListView ItemsSource="{Binding Source={StaticResource PChoicesCollectionView}}">
<ListView.ItemTemplate>
<DataTemplate x:DataType="p:PBase">
<Grid>
<TextBlock Text="{x:Bind Name.Name}" FontSize="18" FontWeight="SemiBold"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<ContentControl ContentTemplateSelector="{StaticResource pDataTemplateSelector}" Content="{Binding Source={StaticResource PChoicesCollectionView}}"/>
You could bind to the SelectedItem property of the ListView:
<ListView Name="lv"
ItemsSource="{Binding Source={StaticResource PChoicesCollectionView}}">
<ListView.ItemTemplate>
<DataTemplate x:DataType="p:PBase">
<Grid>
<TextBlock Text="{Binding}" FontSize="18" FontWeight="SemiBold"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<ContentControl ContentTemplateSelector="{StaticResource pDataTemplateSelector}"
Content="{Binding SelectedItem, ElementName=lv}"/>
I have a list of users on my viewmodel that I pass to the following listView:
<ListView
Background="Azure"
x:Name="ContactList"
ItemsSource="{Binding Path=User}"
SelectedItem="{Binding SelectedUser, Mode=TwoWay}">
<ListView.ItemTemplate>
<DataTemplate>
<Border Width="300" Height="Auto" BorderThickness="1">
<StackPanel>
<TextBlock>
<Run Text="{Binding Name}" />
<Run Text="{Binding Age}" />
</TextBlock>
<CheckBox Visibility="{???}">
<TextBlock FlowDirection="LeftToRight"></TextBlock>
</CheckBox>
</StackPanel>
</Border>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
As you can see my DataTemplate contains a checkbox. I would like its Visibility to depend on a bool-property I have on my ViewModel. How can I access this property from within the listView?
From looking around here it seems like there are ways to access the ListView-items parent. I think that would do it for me. Can someone point me in the right direction . Thanks
The best way to do this is to include the visibility setting along with your user data. Assuming your view model visibility property is named CheckBoxVisibility, you would have something like this:
<ListView ItemsSource="{Binding}" ...>
<ListView.ItemTemplate>
<DataTemplate>
...
<Run Text="{Binding Path=User.Name}" />
<Run Text="{Binding Path=User.Age}" />
...
<CheckBox Visibility="{Binding Path=CheckBoxVisibility}">
...
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
In WPF, you can use a RelativeSource=RelativeAncestor binding; however, this is not available in Window Store/Windows Phone 8+ apps.
Here is the XAML:
<ListBox ItemsSource="{Binding Documents}" BorderBrush="{x:Null}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Title}" FontSize="12" FontWeight="Bold" />
<TextBlock Text="{Binding ID}" FontSize="10" FontStyle="Italic" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ContextMenu>
<ContextMenu ItemsSource="{Binding CategoryList}">
<ContextMenu.ItemTemplate>
<DataTemplate>
<MenuItem Command="{Binding AddDocumentToCategoryContextMenuCommand}" Header="{Binding Category.Name}" />
</DataTemplate>
</ContextMenu.ItemTemplate>
</ContextMenu>
</ListBox.ContextMenu>
</ListBox>
Ok so the ListBox's ItemSource is bound to the Documents collection in the VM and properly renders the Titles and IDs
The Context Menu's ItemSource is bound to the CategoryList collection in the VM and properly renders the list of categories.
The problem I have is with the Command Binding:
Command="{Binding AddDocumentToCategoryContextMenuCommand}"
Since the ItemSource for the ContextMenu is already set, it tries to get the AddDocumentToCategoryContextMenuCommand from CategoryList. Obviously the command is not there, it is a member of the VM.
I do not want any references to the VMs or Models in the XAML. Everything is constructed using Unity and VM-View is associated in App.xaml:
<Application.Resources>
<DataTemplate DataType="{x:Type vms:FeedViewModel}">
<views:FeedView/>
</DataTemplate>
<DataTemplate DataType="{x:Type vms:DocumentsViewModel}">
<views:DocumentsView/>
</DataTemplate>
<DataTemplate DataType="{x:Type vms:ManagementViewModel}">
<views:ManagementView/>
</DataTemplate>
<DataTemplate DataType="{x:Type dev:DevelopmentViewModel}">
<dev:DevelopmentView />
</DataTemplate>
</Application.Resources>
How can I databind to a member of the VM from within the ContextItem.
Thanks.
UPDATED edit #1 starts Here
Here is the updated xaml (but still not working but some insight gained):
<ListBox ItemsSource="{Binding Documents}" x:Name="Results" BorderBrush="{x:Null}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Title}" FontSize="12" FontWeight="Bold" />
<TextBlock Text="{Binding ID}" FontSize="10" FontStyle="Italic" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ContextMenu>
<ContextMenu ItemsSource="{Binding CategoryList}">
<ContextMenu.ItemTemplate>
<DataTemplate>
<MenuItem Command="{Binding ElementName=Results, Path=DataContext.AddDocumentToCategoryContextMenuCommand}" Header="{Binding Category.Name}" />
</DataTemplate>
</ContextMenu.ItemTemplate>
</ContextMenu>
</ListBox.ContextMenu>
</ListBox>
I have this example working for a simple example that does not use a ContextMenu. It appears that the ContextMenu (even though attached to the ListBox) is not part of the user control visual tree. The binding always comes back null / not found. I think the ContextMenu, because it is a floating "window" is constructed in its own tree and therefore cannot find the ListBox call "Results" in order to access the ListBox's DataContext.
Any thoughts on this? Any recommendations on how deal with?
Edit #2 Starts Here
In case you are are wondering, figured out the answer to the binding question:
This binding works:
Command="{Binding RelativeSource={RelativeSource AncestorType=ContextMenu}, Path=PlacementTarget.DataContext.AddDocumentToCategoryContextMenuCommand}
Hope this helps others with the same question.
One last update for completeness.
In order for the command to know which context menu item was clicked on, I had to change the xaml slightly (silly oversight):
<ListBox.ContextMenu>
<ContextMenu x:Name="Context" ItemsSource="{Binding CategoryList}">
<ContextMenu.ItemTemplate>
<DataTemplate>
<MenuItem Command="{Binding RelativeSource={RelativeSource AncestorType=ContextMenu}, Path=PlacementTarget.DataContext.AddDocumentToCategoryContextMenuCommand}"
CommandParameter="{Binding Category.ID}"
Header="{Binding Category.Name}" />
</DataTemplate>
</ContextMenu.ItemTemplate>
</ContextMenu>
</ListBox.ContextMenu>
Again, hope this helps others.
Use the ElementName property of the binding to specify that. You'd end up with something like this:
Command="{Binding ElementName=ViewModelObject
Path=AddDocumentToCategoryContextMenuCommand}"
My datacontext has two properties: Items which is a collection and DetailsVisiblity which is enum of type Visiblity.
On the page I have a Listbox with ItemsSource="{Binding Entries}". Inside the DataTemplate, I can bind stuff to properties of Items, but how do I get access to DetailsVisiblity which is a property of DataContext?
DataContext has two properties: ObservableCollection<Item> Entries, and Visibility DetailsVisiblity. Item class has two properties: Title and Details.
Here is the view. How do I bind Visiblity of the second TextBlock to DetailsVisiblity property?
<ListBox ItemsSource="{Binding Items}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Title}" />
<TextBlock Text="{Binding Details}" Visibility="{Binding ???}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
You could name the ListBox and in the Binding you reference it with ElementName, and in Path you use DataContext.DetailsVisibility
<ListBox x:Name="listBox" ItemsSource="{Binding Items}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Title}" />
<TextBlock Text="{Binding Details}"
Visibility="{Binding ElementName=listBox,
Path=DataContext.DetailsVisibilty}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
I am trying to bind a Listbox ItemSource to a collection of multiple Lists. i.e.
List PersonCollection
List Person
List Collection
Now I need to show items from both of these list. In wpf you could use HierarchicalDataTemplate i believe, but not sure how I can do it in windows phone 7. Tried with Blend and it generates the following data template.
<DataTemplate x:Key="PersonDataTemplate">
<Grid>
<StackPanel Margin="0,0,1,0" Orientation="Vertical" VerticalAlignment="Top">
<TextBlock Margin="0,0,1,0" TextWrapping="Wrap" Text="{Binding Person[0].Name}" d:LayoutOverrides="Width"/>
<TextBlock Margin="0,0,1,0" TextWrapping="Wrap" Text="{Binding Collection[0].Total}" d:LayoutOverrides="Width"/>
</StackPanel>
</Grid>
</DataTemplate>
<ListBox Height="300" x:Name="personList" ItemsSource="{Binding PersonCollection}" Margin="10,0" ItemTemplate="{StaticResource PersonDataTemplate}"/>
Is there another way I can do this? I have tried to set the DataContext of Textbox in DataTemplate to individual arrays but did not seem to work. Cant find anything similar on the net apart from the confirmation that HierarchicalDataTemplate is not supported in Windows Phone 7.
I have other ways to do but none elegant..
Thanks in advance.
Regards
I think your scenario can be solved with two level ListBoxes instead of Tree-Heirarchy. See if the below trick works. Now you will see Both of your inner collection side by side in a Grid which are two other ItemsControls(Or you can have ListBoxes)
<DataTemplate x:Key="PersonCollextionItem">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.5*"/>
<ColumnDefinition Width="0.5*"/>
</Grid.ColumnDefinitions>
<ItemsControl ItemsSource="{Binding ListPerson}" ItemTemplate="{StaticResource Templ1}" Grid.Column="0"/>
<ItemsControl ItemsSource="{Binding ListCollection}" ItemTemplate="{StaticResource Templ2}" Grid.Column="1"/>
</Grid>
</DataTemplate>
<DataTemplate x:Key="Templ1">
<TextBlock Margin="0,0,1,0" Text="{Binding Name}" />
</DataTemplate>
<DataTemplate x:Key="Templ2">
<TextBlock Margin="0,0,1,0" Text="{Binding Total}" />
</DataTemplate>
<ListBox Height="300" x:Name="personList" ItemsSource="{Binding PersonCollection}" Margin="10,0" ItemTemplate="{StaticResource PersonCollextionItem}"/>