feat(ui): Show warning if Input Monitoring is not allowed

Related to #125

src/blackinput/macos/macosinpututils.h

@@ -16,6 +16,9 @@ namespace BlackInput
     public:
         CMacOSInputUtils() = delete;
 
+        //! Check OS permission for input monitoring access
+        static bool hasAccess();
+
         //! Request OS permission for input monitoring access
         static bool requestAccess();
 

src/blackinput/macos/macosinpututils.mm

@@ -8,6 +8,19 @@
 
 namespace BlackInput
 {
+
+    bool CMacOSInputUtils::hasAccess()
+    {
+        if (@available(macOS 10.15, *))
+        {
+            return IOHIDCheckAccess(kIOHIDRequestTypeListenEvent) == IOHIDAccessType::kIOHIDAccessTypeGranted;
+        }
+        else
+        {
+            return true;
+        }
+    }
+
     bool CMacOSInputUtils::requestAccess()
     {
         if (@available(macOS 10.15, *))

src/swiftguistandard/CMakeLists.txt

@@ -29,6 +29,8 @@ target_link_libraries(swiftguistd
         )
 
 if(APPLE)
+    target_link_libraries(swiftguistd PUBLIC input)
+
     set_target_properties(swiftguistd PROPERTIES MACOSX_BUNDLE TRUE)
     set_target_properties(swiftguistd PROPERTIES MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_SOURCE_DIR}/Info.plist)
     set(RESOURCE_FILES swift.icns qt.conf)

src/swiftguistandard/swiftguistd.cpp

@@ -28,6 +28,10 @@
 #include "blackmisc/threadutils.h"
 #include "blackconfig/buildconfig.h"
 
+#if defined(Q_OS_MACOS)
+#    include "blackinput/macos/macosinpututils.h"
+#endif
+
 #include "swiftguistd.h"
 #include <QAction>
 #include <QDateTime>
@@ -475,6 +479,16 @@ void SwiftGuiStd::verifyPrerequisites()
         msgs.push_back(sGui->getIContextSimulator()->verifyPrerequisites());
     }
 
+#if defined(Q_OS_MACOS)
+    if (!BlackInput::CMacOSInputUtils::hasAccess())
+    {
+        // A log message about missing permissions is already emitted when initializing the keyboard.
+        // But this happens way before initializing the GUI. Hence do the check here again to show an error message
+        // to the user
+        msgs.push_back(CLogMessage(this).error(u"Cannot access the keyboard. Is \"Input Monitoring\" for swift enabled?"));
+    }
+#endif
+
     if (msgs.hasWarningOrErrorMessages())
     {
         if (msgs.size() > 1) { this->displayInOverlayWindow(msgs); }