Figure out if device has touch control

src/QGCApplication.h

@@ -79,7 +79,7 @@ public:
     void showMessage(const QString& message);
 
     /// @return true: Fake ui into showing mobile interface
-    bool fakeMobile(void) { return _fakeMobile; }
+    bool fakeMobile(void) const { return _fakeMobile; }
 
     // Still working on getting rid of this and using dependency injection instead for everything
     QGCToolbox* toolbox(void) { return _toolbox; }

src/QmlControls/ScreenToolsController.cc

@@ -26,6 +26,12 @@ ScreenToolsController::ScreenToolsController()
 
 }
 
+bool
+ScreenToolsController::hasTouch() const
+{
+    return QTouchDevice::devices().count() > 0 || isMobile();
+}
+
 QString
 ScreenToolsController::iOSDevice() const
 {

src/QmlControls/ScreenToolsController.h

@@ -37,6 +37,7 @@ public:
     Q_PROPERTY(bool     isLinux             READ isLinux            CONSTANT)
     Q_PROPERTY(bool     isWindows           READ isWindows          CONSTANT)
     Q_PROPERTY(bool     isSerialAvailable   READ isSerialAvailable  CONSTANT)
+    Q_PROPERTY(bool     hasTouch            READ hasTouch           CONSTANT)
     Q_PROPERTY(QString  iOSDevice           READ iOSDevice          CONSTANT)
     Q_PROPERTY(QString  fixedFontFamily     READ fixedFontFamily    CONSTANT)
     Q_PROPERTY(QString  normalFontFamily    READ normalFontFamily   CONSTANT)
@@ -47,9 +48,9 @@ public:
     Q_INVOKABLE int mouseY(void) { return QCursor::pos().y(); }
 
 #if defined(__mobile__)
-    bool    isMobile            () { return true;  }
+    bool    isMobile            () const { return true;  }
 #else
-    bool    isMobile            () { return qgcApp()->fakeMobile(); }
+    bool    isMobile            () const { return qgcApp()->fakeMobile(); }
 #endif
 
 #if defined (Q_OS_ANDROID)
@@ -102,6 +103,8 @@ public:
     bool isDebug                () { return false; }
 #endif
 
+    bool    hasTouch() const;
+
     QString  iOSDevice          () const;
     QString  fixedFontFamily    () const;
     QString  normalFontFamily   () const;