Support Scroll in HoloLens mode

support/hololens/ServoApp/BrowserPage.cpp

@@ -35,6 +35,21 @@ void BrowserPage::OnPageLoaded(IInspectable const &, RoutedEventArgs const &) {
 
   swapChainPanel().PointerReleased(
       std::bind(&BrowserPage::OnSurfaceClicked, this, _1, _2));
+
+  swapChainPanel().ManipulationDelta(
+      std::bind(&BrowserPage::OnSurfaceManipulationDelta, this, _1, _2));
+}
+
+void BrowserPage::OnSurfaceManipulationDelta(
+    IInspectable const &, Input::ManipulationDeltaRoutedEventArgs const &e) {
+  auto x = e.Position().X;
+  auto y = e.Position().Y;
+  auto dx = e.Delta().Translation.X;
+  auto dy = e.Delta().Translation.Y;
+  Event event = {{Event::SCROLL}};
+  event.scrollCoords = {dx, dy, x, y};
+  SendEventToServo(event);
+  e.Handled(true);
 }
 
 void BrowserPage::OnSurfaceClicked(IInspectable const &,
@@ -186,10 +201,15 @@ void BrowserPage::Loop(cancellation_token cancel) {
     for (auto &&e : mEvents) {
       switch (e.type) {
       case Event::CLICK: {
-        auto [x, y] = e.coords;
+        auto [x, y] = e.clickCoords;
         mServo->Click(x, y);
         break;
       }
+      case Event::SCROLL: {
+        auto [x, y, dx, dy] = e.scrollCoords;
+        mServo->Scroll(x, y, dx, dy);
+        break;
+      }
       case Event::FORWARD:
         mServo->GoForward();
         break;

support/hololens/ServoApp/BrowserPage.h

@@ -12,8 +12,9 @@
 namespace winrt::ServoApp::implementation {
 
 struct Event {
-  enum { CLICK, BACK, FORWARD } type;
+  enum { CLICK, SCROLL, BACK, FORWARD } type;
-  std::tuple<float, float> coords;
+  std::tuple<float, float> clickCoords;
+  std::tuple<float, float, float, float> scrollCoords;
 };
 
 struct BrowserPage : BrowserPageT<BrowserPage> {
@@ -31,6 +32,10 @@ public:
   OnSurfaceClicked(Windows::Foundation::IInspectable const &,
                    Windows::UI::Xaml::Input::PointerRoutedEventArgs const &);
 
+  void BrowserPage::OnSurfaceManipulationDelta(
+      IInspectable const &,
+      Windows::UI::Xaml::Input::ManipulationDeltaRoutedEventArgs const &e);
+
 private:
   void OnVisibilityChanged(
       Windows::UI::Core::CoreWindow const &,

support/hololens/ServoApp/BrowserPage.xaml

@@ -28,7 +28,7 @@
         <Button x:Name="immersiveButton" Click="OnImmersiveButtonClicked">Run Immersive</Button>
       </StackPanel>
     </Grid>
-    <SwapChainPanel x:Name="swapChainPanel" MinHeight="200" MinWidth="200" Grid.Row="1">
+    <SwapChainPanel x:Name="swapChainPanel" MinHeight="200" MinWidth="200" Grid.Row="1" ManipulationMode="All">
     </SwapChainPanel>
   </Grid>
 </Page>

support/hololens/ServoApp/Servo.cpp

@@ -51,7 +51,7 @@ Servo::Servo(GLsizei width, GLsizei height)
 
   CInitOptions o;
   o.args = NULL;
-  o.url = "https://google.com";
+  o.url = "https://servo.org";
   o.width = mWindowWidth;
   o.height = mWindowHeight;
   o.density = 1.0;
@@ -93,3 +93,4 @@ void Servo::SetSize(GLsizei width, GLsizei height) {
 }
 
 void Servo::Click(float x, float y) { click(x, y); }
+void Servo::Scroll(float dx, float dy, float x, float y) { scroll(dx, dy, x, y); }

support/hololens/ServoApp/Servo.h

@@ -16,6 +16,7 @@ public:
   ~Servo();
   void PerformUpdates();
   void Click(float, float);
+  void Scroll(float dx, float dy, float x, float y);
   void SetSize(GLsizei width, GLsizei height);
   void SetBatchMode(bool);
   void GoBack();