Windows QPA: Fix missing update when the display is sleeping

If an item was updated while the display was in sleep mode then when the
display came back from sleep it would not be updated. This change detects
when the display returns from sleep and repaints the windows to ensure
the updated items are presented.

Fixes: QTBUG-76307
Change-Id: I5fff5209e8a5c359d06ba1df61944690e9475ea6
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

3 files changed, 62 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp
index 38b9823d6b..5c1b00a1c9 100644
--- a/src/plugins/platforms/windows/qwindowscontext.cpp
+++ b/src/plugins/platforms/windows/qwindowscontext.cpp
@@ -273,6 +273,8 @@ struct QWindowsContextPrivate {
     const HRESULT m_oleInitializeResult;
     QWindow *m_lastActiveWindow = nullptr;
     bool m_asyncExpose = false;
+    HPOWERNOTIFY m_powerNotification = nullptr;
+    HWND m_powerDummyWindow = nullptr;
 };
 
 QWindowsContextPrivate::QWindowsContextPrivate()
@@ -313,6 +315,13 @@ QWindowsContext::~QWindowsContext()
 #if QT_CONFIG(tabletevent)
     d->m_tabletSupport.reset(); // Destroy internal window before unregistering classes.
 #endif
+
+    if (d->m_powerNotification)
+        UnregisterPowerSettingNotification(d->m_powerNotification);
+
+    if (d->m_powerDummyWindow)
+        DestroyWindow(d->m_powerDummyWindow);
+
     unregisterWindowClasses();
     if (d->m_oleInitializeResult == S_OK || d->m_oleInitializeResult == S_FALSE)
         OleUninitialize();
@@ -380,6 +389,55 @@ bool QWindowsContext::initPointer(unsigned integrationOptions)
     return true;
 }
 
+extern "C" LRESULT QT_WIN_CALLBACK qWindowsPowerWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+    if (message != WM_POWERBROADCAST || wParam != PBT_POWERSETTINGCHANGE)
+        return DefWindowProc(hwnd, message, wParam, lParam);
+
+    static bool initialized = false; // ignore the initial change
+    if (!initialized) {
+        initialized = true;
+        return DefWindowProc(hwnd, message, wParam, lParam);
+    }
+
+    auto setting = reinterpret_cast<const POWERBROADCAST_SETTING *>(lParam);
+    if (setting) {
+        auto data = reinterpret_cast<const DWORD *>(&setting->Data);
+        if (*data == 1) {
+            // Repaint the windows when returning from sleeping display mode.
+            const auto tlw = QGuiApplication::topLevelWindows();
+            for (auto w : tlw) {
+                if (w->isVisible() && w->windowState() != Qt::WindowMinimized) {
+                    if (auto tw = QWindowsWindow::windowsWindowOf(w)) {
+                        if (HWND hwnd = tw->handle()) {
+                            InvalidateRect(hwnd, nullptr, false);
+                        }
+                    }
+                }
+            }
+        }
+    }
+    return DefWindowProc(hwnd, message, wParam, lParam);
+}
+
+bool QWindowsContext::initPowerNotificationHandler()
+{
+    if (d->m_powerNotification)
+        return false;
+
+    d->m_powerDummyWindow = createDummyWindow(QStringLiteral("QtPowerDummyWindow"), L"QtPowerDummyWindow", qWindowsPowerWindowProc);
+    if (!d->m_powerDummyWindow)
+        return false;
+
+    d->m_powerNotification = RegisterPowerSettingNotification(d->m_powerDummyWindow, &GUID_MONITOR_POWER_ON, DEVICE_NOTIFY_WINDOW_HANDLE);
+    if (!d->m_powerNotification) {
+        DestroyWindow(d->m_powerDummyWindow);
+        d->m_powerDummyWindow = nullptr;
+        return false;
+    }
+    return true;
+}
+
 void QWindowsContext::setTabletAbsoluteRange(int a)
 {
 #if QT_CONFIG(tabletevent)
diff --git a/src/plugins/platforms/windows/qwindowscontext.h b/src/plugins/platforms/windows/qwindowscontext.h
index 4908f14629..04290379db 100644
--- a/src/plugins/platforms/windows/qwindowscontext.h
+++ b/src/plugins/platforms/windows/qwindowscontext.h
@@ -176,6 +176,8 @@ public:
     bool initTablet(unsigned integrationOptions);
     bool initPointer(unsigned integrationOptions);
 
+    bool initPowerNotificationHandler();
+
     int defaultDPI() const;
 
     QString registerWindowClass(const QWindow *w);
diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index 5c1fa00088..849e6cf2d0 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -256,6 +256,8 @@ QWindowsIntegrationPrivate::QWindowsIntegrationPrivate(const QStringList &paramL
 
     m_context.initTouch(m_options);
     QPlatformCursor::setCapability(QPlatformCursor::OverrideCursor);
+
+    m_context.initPowerNotificationHandler();
 }
 
 QWindowsIntegrationPrivate::~QWindowsIntegrationPrivate()