Added TerminalVelocity for BackgroundTaskBuilder API

build/AzurePipelinesTemplates/WindowsAppSDK-SetupBuildEnvironment-Steps.yml

@@ -131,6 +131,14 @@ steps:
     arguments: -Path $(Build.SourcesDirectory)\dev\common\TerminalVelocityFeatures-ApplicationData.xml -Channel $(channel) -Language C++ -Namespace Microsoft.Windows.Storage.ApplicationData -Output $(Build.SourcesDirectory)\dev\common\TerminalVelocityFeatures-ApplicationData.h
     workingDirectory: '$(Build.SourcesDirectory)'
 
+- task: powershell@2
+  displayName: 'Create BackgroundTask TerminalVelocity features'
+  inputs:
+    targetType: filePath
+    filePath: tools\TerminalVelocity\Generate-TerminalVelocityFeatures.ps1
+    arguments: -Path $(Build.SourcesDirectory)\dev\common\TerminalVelocityFeatures-BackgroundTask.xml -Channel $(channel) -Language C++ -Namespace Microsoft.Windows.ApplicationModel.Background -Output $(Build.SourcesDirectory)\dev\common\TerminalVelocityFeatures-BackgroundTask.h
+    workingDirectory: '$(Build.SourcesDirectory)'
+
 - task: powershell@2
   displayName: 'Create AppNotifications TerminalVelocity features'
   inputs:

dev/BackgroundTask/BackgroundTaskBuilder/BackgroundTaskBuilder.h

@@ -4,12 +4,17 @@
 #pragma once
 #include <winrt/Windows.ApplicationModel.Background.h>
 #include "Microsoft.Windows.ApplicationModel.Background.BackgroundTaskBuilder.g.h"
+#include <TerminalVelocityFeatures-BackgroundTask.h>
 
 namespace winrt::Microsoft::Windows::ApplicationModel::Background::implementation
 {
     struct BackgroundTaskBuilder : BackgroundTaskBuilderT<BackgroundTaskBuilder>
     {
-        BackgroundTaskBuilder() = default;
+        BackgroundTaskBuilder()
+        {
+            THROW_HR_IF(E_NOTIMPL, !::Microsoft::Windows::ApplicationModel::Background::Feature_BackgroundTask::IsEnabled());
+        }
+
         void SetTaskEntryPointClsid(winrt::guid clsId);
 
         void SetTrigger(

dev/BackgroundTask/BackgroundTaskBuilder/BackgroundTaskBuilder.idl

@@ -1,12 +1,14 @@
 // Copyright (c) Microsoft Corporation and Contributors.
 // Licensed under the MIT License.
+#include <TerminalVelocityFeatures-BackgroundTask.h>
 
 namespace Microsoft.Windows.ApplicationModel.Background
 {
     [contractversion(1)]
     apicontract BackgroundTaskContract{};
 
     [contract(BackgroundTaskContract, 1)]
+    [feature(Feature_BackgroundTask)]
     runtimeclass BackgroundTaskBuilder
     {
         BackgroundTaskBuilder();

dev/Common/TerminalVelocityFeatures-BackgroundTask.h

@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation and Contributors.
+// Licensed under the MIT License.
+
+// THIS FILE IS AUTOMATICALLY GENERATED; DO NOT EDIT IT
+
+// INPUT FILE: dev\common\TerminalVelocityFeatures-BackgroundTask.xml
+// OPTIONS: -Channel Experimental -Language C++ -Namespace Microsoft.Windows.ApplicationModel.Background -Path dev\common\TerminalVelocityFeatures-BackgroundTask.xml -Output dev\common\TerminalVelocityFeatures-BackgroundTask.h
+
+#if defined(__midlrt)
+namespace features
+{
+    feature_name Feature_BackgroundTask = { DisabledByDefault, FALSE };
+}
+#endif // defined(__midlrt)
+
+// Feature constants
+#define WINDOWSAPPRUNTIME_MICROSOFT_WINDOWS_APPLICATIONMODEL_BACKGROUND_FEATURE_BACKGROUNDTASK_ENABLED 1
+
+#if defined(__cplusplus)
+
+namespace Microsoft::Windows::ApplicationModel::Background
+{
+
+__pragma(detect_mismatch("ODR_violation_WINDOWSAPPRUNTIME_MICROSOFT_WINDOWS_APPLICATIONMODEL_BACKGROUND_FEATURE_BACKGROUNDTASK_ENABLED_mismatch", "AlwaysEnabled"))
+struct Feature_BackgroundTask
+{
+    static constexpr bool IsEnabled() { return WINDOWSAPPRUNTIME_MICROSOFT_WINDOWS_APPLICATIONMODEL_BACKGROUND_FEATURE_BACKGROUNDTASK_ENABLED == 1; }
+};
+
+} // namespace Microsoft.Windows.ApplicationModel.Background
+
+#endif // defined(__cplusplus)

dev/Common/TerminalVelocityFeatures-BackgroundTask.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<features xmlns="http://microsoft.com/windowsappsdk/TerminalVelocity/20210729/TerminalVelocityFeatures.xsd">
+
+<!-- Copyright (c) Microsoft Corporation. All rights reserved.
+     Licensed under the MIT License. See LICENSE in the project root for license information.
+-->
+
+    <!-- See docs/TerminalVelocity.md for more info.  -->
+
+    <!-- Enabled variants -->
+    <feature>
+        <name>Feature_BackgroundTask</name>
+        <description>Supports BackgroundTask executions for WinAppSDK apps</description>
+        <state>AlwaysEnabled</state>
+        <alwaysDisabledChannelTokens>
+            <channelToken>Preview</channelToken>
+            <channelToken>Stable</channelToken>
+        </alwaysDisabledChannelTokens>
+    </feature>
+</features>

specs/BackgroundTask/BackgroundTaskBuilder.md

@@ -15,7 +15,7 @@ This API takes care of avoiding this workaround so that WinAppSDK applications c
 
  ## Register Background Task (c++)
 
- Registering a Background Task for full trust COM component. Developers may also need to set the **WindowsAppSDKBackgroundTask** property as true in their project configuration.
+ Registering a Background Task for full trust COM component. Developers may also need to set the **WindowsAppSDKBackgroundTask** property as *true* in the project configuration. Also in the manifest file *EntryPoint* for BackgroundTask is to be set as **Microsoft.Windows.ApplicationModel.Background.UniversalBGTask.Task**
 
  ```c++
        //Using WinAppSDK API for BackgroundTaskBuilder
@@ -28,6 +28,15 @@ This API takes care of avoiding this workaround so that WinAppSDK applications c
         builder.Register(); 
 ```
 
+Package Manifest:
+```
+        <Extension Category="windows.backgroundTasks" EntryPoint="Microsoft.Windows.ApplicationModel.Background.UniversalBGTask.Task">
+            <BackgroundTasks>
+                <Task Type="general"/>
+            </BackgroundTasks>
+        </Extension>
+```
+
 # API Pages
 
 ## BackgroundTaskBuilder class