Simplify sending of system events in MythScreenType.

Now that MythSystemEvents can be sent via gCoreContext, we don't
need to post these directly inside MythScreenType.  Instead,
just #include mythcorecontext.h and send via
gCoreContext->SendSystemEvent().  Should have done this in the
last commit.

Author: cpinkham

mythtv/libs/libmythui/mythscreentype.cpp

@@ -5,6 +5,7 @@
 #include <QDomDocument>
 #include <QRunnable>
 
+#include "mythcorecontext.h"
 #include "mythobservable.h"
 #include "mthreadpool.h"
 
@@ -50,9 +51,8 @@ MythScreenType::MythScreenType(MythScreenStack *parent, const QString &name,
     // Can be overridden, of course, but default to full sized.
     m_Area = GetMythMainWindow()->GetUIScreenRect();
 
-    MythEvent me(QString("GLOBAL_SYSTEM_EVENT SCREEN_TYPE CREATED %1").arg(name));
-    QCoreApplication::postEvent(
-        GetMythMainWindow()->GetSystemEventHandler(), me.clone());
+    gCoreContext->SendSystemEvent(
+        QString("SCREEN_TYPE CREATED %1").arg(name));
 }
 
 MythScreenType::MythScreenType(MythUIType *parent, const QString &name,
@@ -71,17 +71,14 @@ MythScreenType::MythScreenType(MythUIType *parent, const QString &name,
 
     m_Area = GetMythMainWindow()->GetUIScreenRect();
 
-    MythEvent me(QString("GLOBAL_SYSTEM_EVENT SCREEN_TYPE CREATED %1").arg(name));
-    QCoreApplication::postEvent(
-        GetMythMainWindow()->GetSystemEventHandler(), me.clone());
+    gCoreContext->SendSystemEvent(
+        QString("SCREEN_TYPE CREATED %1").arg(name));
 }
 
 MythScreenType::~MythScreenType()
 {
-    MythEvent me(QString("GLOBAL_SYSTEM_EVENT SCREEN_TYPE DESTROYED %1")
-                         .arg(objectName()));
-    QCoreApplication::postEvent(
-        GetMythMainWindow()->GetSystemEventHandler(), me.clone());
+    gCoreContext->SendSystemEvent(
+        QString("SCREEN_TYPE DESTROYED %1").arg(objectName()));
 
     m_CurrentFocusWidget = NULL;
     emit Exiting();
@@ -472,12 +469,7 @@ bool MythScreenType::keyPressEvent(QKeyEvent *event)
         else if (action == "MENU")
             ShowMenu();
         else if (action.startsWith("SYSEVENT"))
-        {
-            MythEvent me(QString("GLOBAL_SYSTEM_EVENT KEY_%1")
-                                 .arg(action.mid(8)));
-            QCoreApplication::postEvent(
-                GetMythMainWindow()->GetSystemEventHandler(), me.clone());
-        }
+            gCoreContext->SendSystemEvent(QString("KEY_%1").arg(action.mid(8)));
         else if (action == ACTION_SCREENSHOT)
         {
             GetMythMainWindow()->ScreenShot();