- 1 year ago
C++/WinRT UWP: Creating custom DataTemplateSelector
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To create a custom DataTemplateSelector
in C++/WinRT for UWP (Universal Windows Platform), you'll need to follow these steps:
- Create a new C++/WinRT class that derives from the
DataTemplateSelector
base class.
cpp#pragma once
#include "winrt/Windows.UI.Xaml.Controls.h"
using namespace winrt::Windows::UI::Xaml::Controls;
namespace YourNamespace
{
// CustomDataTemplateSelector class derived from DataTemplateSelector
struct CustomDataTemplateSelector : winrt::implements<CustomDataTemplateSelector, DataTemplateSelector>
{
// Override the SelectTemplateCore method
DataTemplate SelectTemplateCore(winrt::Windows::Foundation::IInspectable const& item) const;
};
}
- Implement the
SelectTemplateCore
method in theCustomDataTemplateSelector
class. This method will be responsible for selecting the appropriateDataTemplate
based on the provided item.
cppDataTemplate CustomDataTemplateSelector::SelectTemplateCore(winrt::Windows::Foundation::IInspectable const& item) const
{
// Convert the item to the appropriate data type and perform your logic to select the template
// Example logic: Check the item's properties and return the appropriate template based on the conditions
// Return the selected DataTemplate
return ...; // Replace with your code to return the selected DataTemplate
}
- Register the
CustomDataTemplateSelector
class in your XAML file as a static resource.
xaml<Page ...
xmlns:local="using:YourNamespace">
<Page.Resources>
<local:CustomDataTemplateSelector x:Key="MyDataTemplateSelector" />
</Page.Resources>
<!-- Your XAML content here -->
</Page>
- Assign the
CustomDataTemplateSelector
to theItemTemplateSelector
property of theItemsControl
or any control that usesDataTemplate
selection.
xaml<ItemsControl ItemTemplateSelector="{StaticResource MyDataTemplateSelector}" ... />
- Implement the logic inside the
SelectTemplateCore
method to select the appropriateDataTemplate
based on your requirements. You can access the properties or data of the item and return the correspondingDataTemplate
instance.
Remember to replace YourNamespace
with the actual namespace of your project and implement the specific logic in the SelectTemplateCore
method to determine the appropriate DataTemplate
to return.
By following these steps, you can create a custom DataTemplateSelector
in C++/WinRT for UWP and use it to select different DataTemplate
instances based on your application's requirements.