Prompt user to install OpenXR package if not installed

support/hololens/ServoApp/BrowserPage.cpp

@@ -18,6 +18,23 @@ namespace winrt::ServoApp::implementation {
 BrowserPage::BrowserPage() {
   InitializeComponent();
   BindServoEvents();
+  if (!xrPkgChecker.IsInstalled()) {
+    XRPkgWarning().Visibility(Visibility::Visible);
+    xrPkgChecker.OnInstalled(
+        [=] { XRPkgWarning().Visibility(Visibility::Collapsed); },
+        std::chrono::seconds{5});
+  }
+}
+
+void BrowserPage::OnXRPkgWarningDismissClick(IInspectable const &,
+                                             RoutedEventArgs const &) {
+  xrPkgChecker.StopTracking();
+  XRPkgWarning().Visibility(Visibility::Collapsed);
+}
+
+void BrowserPage::OnXRPkgWarningInstallClick(IInspectable const &,
+                                             RoutedEventArgs const &) {
+  xrPkgChecker.OpenStore();
 }
 
 void BrowserPage::BindServoEvents() {

support/hololens/ServoApp/BrowserPage.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include "BrowserPage.g.h"
+#include "XRPkgChecker.h"
 #include "ServoControl\ServoControl.h"
 
 namespace winrt::ServoApp::implementation {
@@ -34,9 +35,14 @@ struct BrowserPage : BrowserPageT<BrowserPage> {
   void LoadServoURI(Windows::Foundation::Uri uri);
   void SetTransientMode(bool);
   void SetArgs(hstring);
+  void OnXRPkgWarningInstallClick(Windows::Foundation::IInspectable const &,
+                                  Windows::UI::Xaml::RoutedEventArgs const &);
+  void OnXRPkgWarningDismissClick(Windows::Foundation::IInspectable const &,
+                                  Windows::UI::Xaml::RoutedEventArgs const &);
 
 private:
   void BindServoEvents();
+  XRPkgChecker xrPkgChecker;
 };
 } // namespace winrt::ServoApp::implementation
 

support/hololens/ServoApp/BrowserPage.xaml

@@ -84,6 +84,7 @@
             <RowDefinition Height="auto"/>
             <RowDefinition Height="*"/>
             <RowDefinition Height="auto"/>
+            <RowDefinition Height="auto"/>
         </Grid.RowDefinitions>
         <Grid Grid.Row="0" x:Name="navigationBar" Background="{ThemeResource InkToolbarButtonBackgroundThemeBrush}">
             <Grid.ColumnDefinitions>
@@ -126,5 +127,12 @@
         </Grid>
         <local:ServoControl TabIndex="0" x:Name="servoControl" Grid.Row="1"/>
         <ProgressBar x:Name="transientLoadingIndicator" Visibility="Collapsed" Grid.Row="2"/>
+        <StackPanel Grid.Row="2" Background="LightYellow" Padding="10" BorderThickness="0,2,0,0" BorderBrush="Black" x:Name="XRPkgWarning" Visibility="Collapsed">
+            <TextBlock Margin="0,0" VerticalAlignment="Center">The package "Windows OpenXR Developer Preview" is not installed. WebXR pages won't work.</TextBlock>
+            <StackPanel Orientation="Horizontal">
+                <Button Margin="0,10,10,0" Click="OnXRPkgWarningInstallClick">Install Package</Button>
+                <Button Margin="0,10,10,0" Click="OnXRPkgWarningDismissClick">Dismiss</Button>
+            </StackPanel>
+        </StackPanel>
     </Grid>
 </Page>

support/hololens/ServoApp/Package.appxmanifest

@@ -1,5 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"  xmlns:uap5="http://schemas.microsoft.com/appx/manifest/uap/windows10/5" IgnorableNamespaces="uap mp uap5">
+<Package
+  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
+  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" 
+  xmlns:uap5="http://schemas.microsoft.com/appx/manifest/uap/windows10/5"
+  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
+  IgnorableNamespaces="uap mp uap5 rescap">
   <Identity Name="1d265729-8836-4bd3-9992-4cb111d1068b" Publisher="CN=Allizom" Version="1.0.0.0" />
   <mp:PhoneIdentity PhoneProductId="1d265729-8836-4bd3-9992-4cb111d1068b" PhonePublisherId="00000000-0000-0000-0000-000000000000" />
   <Properties>
@@ -44,6 +50,7 @@
     </Application>
   </Applications>
   <Capabilities>
+    <rescap:Capability Name="packageQuery" />
     <Capability Name="internetClient" />
     <Capability Name="codeGeneration" />
     <Capability Name="privateNetworkClientServer" />

support/hololens/ServoApp/ServoApp.vcxproj

@@ -133,6 +133,7 @@
     <ClInclude Include="ServoControl\Servo.h" />
     <ClInclude Include="ServoControl\ServoControl.h" />
     <ClInclude Include="DefaultUrl.h" />
+    <ClInclude Include="XRPkgChecker.h" />
   </ItemGroup>
   <ItemGroup>
     <ApplicationDefinition Include="App.xaml">
@@ -928,6 +929,7 @@
     <ClCompile Include="ServoControl\OpenGLES.cpp" />
     <ClCompile Include="ServoControl\Servo.cpp" />
     <ClCompile Include="ServoControl\ServoControl.cpp" />
+    <ClCompile Include="XRPkgChecker.cpp" />
   </ItemGroup>
   <ItemGroup>
     <Midl Include="App.idl">

support/hololens/ServoApp/ServoApp.vcxproj.filters

@@ -22,6 +22,7 @@
     <ClCompile Include="ServoControl\ServoControl.cpp">
       <Filter>ServoControl</Filter>
     </ClCompile>
+    <ClCompile Include="XRPkgChecker.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="pch.h" />
@@ -38,6 +39,7 @@
       <Filter>ServoControl</Filter>
     </ClInclude>
     <ClInclude Include="DefaultUrl.h" />
+    <ClInclude Include="XRPkgChecker.h" />
   </ItemGroup>
   <ItemGroup>
     <Image Include="Assets\Wide310x150Logo.scale-200.png">

support/hololens/ServoApp/XRPkgChecker.cpp

@@ -0,0 +1,52 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include "pch.h"
+#include "XRPkgChecker.h"
+#include "logs.h"
+#include "winrt/Windows.Management.Deployment.h"
+
+using namespace winrt::Windows::Management::Deployment;
+
+namespace winrt {
+
+void XRPkgChecker::OnInstalled(std::function<void()> callback,
+                               winrt::Windows::Foundation::TimeSpan interval) {
+  timer.Stop();
+  timer.Interval(interval);
+  installed_callback = std::make_unique<std::function<void()>>(callback);
+  timer.Tick({this, &XRPkgChecker::CheckXRPkgTick});
+  timer.Start();
+}
+
+void XRPkgChecker::StopTracking() {
+  installed_callback.reset();
+  timer.Stop();
+}
+
+void XRPkgChecker::CheckXRPkgTick(Windows::Foundation::IInspectable const &,
+                                  Windows::Foundation::IInspectable const &) {
+  if (IsInstalled()) {
+    (*installed_callback)();
+    StopTracking();
+  }
+}
+
+void XRPkgChecker::OpenStore() {
+  std::wstring url = L"ms-windows-store://pdp/?PFN=";
+  Windows::Foundation::Uri uri{url + OPENXR_PACKAGE_NAME};
+  Windows::System::Launcher::LaunchUriAsync(uri);
+}
+
+bool XRPkgChecker::IsInstalled() {
+  auto current_user = L"";
+  for (auto package : PackageManager().FindPackagesForUser(current_user)) {
+    if (package.Id().Name() == OPENXR_PACKAGE_SHORT_NAME) {
+      return true;
+    }
+  }
+  return false;
+}
+
+} // namespace winrt

support/hololens/ServoApp/XRPkgChecker.h

@@ -0,0 +1,30 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#pragma once
+
+#include "pch.h"
+
+namespace winrt {
+class XRPkgChecker {
+
+public:
+  void OnInstalled(std::function<void()> callback,
+                   winrt::Windows::Foundation::TimeSpan interval);
+  bool IsInstalled();
+  void StopTracking();
+  void OpenStore();
+
+private:
+  std::unique_ptr<std::function<void()>> installed_callback;
+  void CheckXRPkgTick(Windows::Foundation::IInspectable const &,
+                      Windows::Foundation::IInspectable const &);
+  Windows::UI::Xaml::DispatcherTimer timer;
+  inline static const hstring OPENXR_PACKAGE_NAME =
+      L"Microsoft.MixedRealityRuntimeDeveloperPreview_8wekyb3d8bbwe";
+  inline static const hstring OPENXR_PACKAGE_SHORT_NAME =
+      L"Microsoft.MixedRealityRuntimeDeveloperPreview";
+};
+
+} // namespace winrt