SystemComponent: expose web scale as explicit property

Web-client needs the correct scale at initialization. Until now, we've
attempted to do this via the "initialScale" URL parameter. But that
leaves a time window where the scale can change, but the web-client has
not setup a change listener yet. The solution is makign web-client read
the property on initialization.

The "initialScale" thing can probably be removed later. Not sure.

This actually fixes the fullscreen/web mode switching scale race
condition. Requires web-client update for that to work (which is not
doine yet).

src/system/SystemComponent.cpp

@@ -41,7 +41,7 @@ QMap<SystemComponent::PlatformArch, QString> g_platformArchNames = {
 
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
-SystemComponent::SystemComponent(QObject* parent) : ComponentBase(parent), m_platformType(platformTypeUnknown), m_platformArch(platformArchUnknown), m_doLogMessages(false), m_cursorVisible(true)
+SystemComponent::SystemComponent(QObject* parent) : ComponentBase(parent), m_platformType(platformTypeUnknown), m_platformArch(platformArchUnknown), m_doLogMessages(false), m_cursorVisible(true), m_scale(0)
 {
   m_mouseOutTimer = new QTimer(this);
   m_mouseOutTimer->setSingleShot(true);
@@ -361,3 +361,12 @@ QString SystemComponent::getCapabilitiesString()
   return capstring.arg(dtschannels).arg(ac3channels);
 }
 
+/////////////////////////////////////////////////////////////////////////////////////////
+void SystemComponent::updateScale(qreal scale)
+{
+  if (scale != m_scale)
+  {
+    m_scale = scale;
+    emit scaleChanged(m_scale);
+  }
+}

src/system/SystemComponent.h

@@ -15,11 +15,12 @@ class SystemComponent : public ComponentBase
   Q_OBJECT
   DEFINE_SINGLETON(SystemComponent);
 
+public:
   Q_PROPERTY(bool isMacos READ platformIsMac CONSTANT)
   Q_PROPERTY(bool isWindows READ platformIsWindows CONSTANT)
   Q_PROPERTY(bool isLinux READ platformIsLinux CONSTANT)
+  Q_PROPERTY(qreal scale MEMBER m_scale NOTIFY scaleChanged )
 
-public:
   bool componentExport() override { return true; }
   const char* componentName() override { return "system"; }
   bool componentInitialize() override;
@@ -86,6 +87,8 @@ public:
 
   Q_INVOKABLE void crashApp();
 
+  void updateScale(qreal scale);
+
 signals:
   void hostMessage(const QString& message);
   void settingsMessage(const QString& setting, const QString& value);
@@ -106,6 +109,7 @@ private:
   QString m_authenticationToken;
   QString m_webClientVersion;
   bool m_cursorVisible;
+  qreal m_scale;
 
 };
 

src/ui/KonvergoWindow.cpp

@@ -630,7 +630,7 @@ void KonvergoWindow::notifyScale(const QSize& size)
 
     m_lastWindowScale = windowScale;
     m_lastWebScale = webScale;
-    emit SystemComponent::Get().scaleChanged(webScale);
+    emit SystemComponent::Get().updateScale(webScale);
     emit webScaleChanged();
   }
 }