Add suspend and resume event handling for WinRT

Task-number: QTBUG-35952

Change-Id: Icb4edb0f55c1d02dfbb5501df311b0fff87d2dc1
Reviewed-by: Andrew Knight <andrew.knight@digia.com>

2 files changed, 39 insertions, 0 deletions

diff --git a/src/plugins/platforms/winrt/qwinrtscreen.cpp b/src/plugins/platforms/winrt/qwinrtscreen.cpp
index 911d3619fe..5bbf73a945 100644
--- a/src/plugins/platforms/winrt/qwinrtscreen.cpp
+++ b/src/plugins/platforms/winrt/qwinrtscreen.cpp
@@ -54,6 +54,8 @@
 
 #include <wrl.h>
 #include <windows.system.h>
+#include <Windows.Applicationmodel.h>
+#include <Windows.ApplicationModel.core.h>
 #include <windows.devices.input.h>
 #include <windows.ui.h>
 #include <windows.ui.core.h>
@@ -64,6 +66,8 @@
 
 using namespace Microsoft::WRL;
 using namespace Microsoft::WRL::Wrappers;
+using namespace ABI::Windows::ApplicationModel;
+using namespace ABI::Windows::ApplicationModel::Core;
 using namespace ABI::Windows::Foundation;
 using namespace ABI::Windows::System;
 using namespace ABI::Windows::UI::Core;
@@ -72,6 +76,8 @@ using namespace ABI::Windows::UI::ViewManagement;
 using namespace ABI::Windows::Devices::Input;
 using namespace ABI::Windows::Graphics::Display;
 
+typedef IEventHandler<IInspectable*> ResumeHandler;
+typedef IEventHandler<SuspendingEventArgs*> SuspendHandler;
 typedef ITypedEventHandler<CoreWindow*, WindowActivatedEventArgs*> ActivatedHandler;
 typedef ITypedEventHandler<CoreWindow*, CoreWindowEventArgs*> ClosedHandler;
 typedef ITypedEventHandler<CoreWindow*, CharacterReceivedEventArgs*> CharacterReceivedHandler;
@@ -485,6 +491,13 @@ QWinRTScreen::QWinRTScreen(ICoreWindow *window)
     GetActivationFactory(HString::MakeReference(RuntimeClass_Windows_UI_ViewManagement_ApplicationView).Get(),
                          &m_applicationView);
 #endif
+
+
+    if (SUCCEEDED(RoGetActivationFactory(Wrappers::HString::MakeReference(RuntimeClass_Windows_ApplicationModel_Core_CoreApplication).Get(),
+                                         IID_PPV_ARGS(&m_application)))) {
+        m_application->add_Suspending(Callback<SuspendHandler>(this, &QWinRTScreen::onSuspended).Get(), &m_suspendTokens[Qt::ApplicationSuspended]);
+        m_application->add_Resuming(Callback<ResumeHandler>(this, &QWinRTScreen::onResume).Get(), &m_suspendTokens[Qt::ApplicationHidden]);
+    }
 }
 
 QRect QWinRTScreen::geometry() const
@@ -938,6 +951,21 @@ HRESULT QWinRTScreen::onActivated(ICoreWindow *window, IWindowActivatedEventArgs
     return S_OK;
 }
 
+HRESULT QWinRTScreen::onSuspended(IInspectable *, ISuspendingEventArgs *)
+{
+    QWindowSystemInterface::handleApplicationStateChanged(Qt::ApplicationSuspended);
+    QWindowSystemInterface::flushWindowSystemEvents();
+    return S_OK;
+}
+
+HRESULT QWinRTScreen::onResume(IInspectable *, IInspectable *)
+{
+    // First the system invokes onResume and then changes
+    // the visibility of the screen to be active.
+    QWindowSystemInterface::handleApplicationStateChanged(Qt::ApplicationHidden);
+    return S_OK;
+}
+
 HRESULT QWinRTScreen::onClosed(ICoreWindow *window, ICoreWindowEventArgs *args)
 {
     Q_UNUSED(window);
diff --git a/src/plugins/platforms/winrt/qwinrtscreen.h b/src/plugins/platforms/winrt/qwinrtscreen.h
index 21e50fa10a..3131f879b5 100644
--- a/src/plugins/platforms/winrt/qwinrtscreen.h
+++ b/src/plugins/platforms/winrt/qwinrtscreen.h
@@ -53,6 +53,12 @@
 
 namespace ABI {
     namespace Windows {
+        namespace ApplicationModel {
+            struct ISuspendingEventArgs;
+            namespace Core {
+                struct ICoreApplication;
+            }
+        }
         namespace UI {
             namespace Core {
                 struct IAutomationProviderRequestedEventArgs;
@@ -123,6 +129,7 @@ private:
 
     // Event handlers
     QHash<QEvent::Type, EventRegistrationToken> m_tokens;
+    QHash<Qt::ApplicationState, EventRegistrationToken> m_suspendTokens;
 
     HRESULT onKeyDown(ABI::Windows::UI::Core::ICoreWindow *window, ABI::Windows::UI::Core::IKeyEventArgs *args);
     HRESULT onKeyUp(ABI::Windows::UI::Core::ICoreWindow *window, ABI::Windows::UI::Core::IKeyEventArgs *args);
@@ -133,6 +140,9 @@ private:
     HRESULT onSizeChanged(ABI::Windows::UI::Core::ICoreWindow *window, ABI::Windows::UI::Core::IWindowSizeChangedEventArgs *args);
 
     HRESULT onActivated(ABI::Windows::UI::Core::ICoreWindow *, ABI::Windows::UI::Core::IWindowActivatedEventArgs *args);
+    HRESULT onSuspended(IInspectable *, ABI::Windows::ApplicationModel::ISuspendingEventArgs *);
+    HRESULT onResume(IInspectable *, IInspectable *);
+
     HRESULT onClosed(ABI::Windows::UI::Core::ICoreWindow *, ABI::Windows::UI::Core::ICoreWindowEventArgs *args);
     HRESULT onVisibilityChanged(ABI::Windows::UI::Core::ICoreWindow *, ABI::Windows::UI::Core::IVisibilityChangedEventArgs *args);
     HRESULT onAutomationProviderRequested(ABI::Windows::UI::Core::ICoreWindow *, ABI::Windows::UI::Core::IAutomationProviderRequestedEventArgs *args);
@@ -141,6 +151,7 @@ private:
 
     ABI::Windows::UI::Core::ICoreWindow *m_coreWindow;
     ABI::Windows::UI::ViewManagement::IApplicationViewStatics *m_applicationView;
+    ABI::Windows::ApplicationModel::Core::ICoreApplication *m_application;
     QRect m_geometry;
     QImage::Format m_format;
     QSurfaceFormat m_surfaceFormat;