Allow to set a dependence on a StateType object

A dependence is based on the StateType being visible, and all the children of that state to be visible

mythtv/libs/libmythui/mythuistatetype.cpp

@@ -16,6 +16,7 @@ MythUIStateType::MythUIStateType(MythUIType *parent, const QString &name)
 {
     m_CurrentState = NULL;
     m_ShowEmpty = true;
+    emit DependChanged(false);
 }
 
 MythUIStateType::~MythUIStateType()
@@ -112,6 +113,7 @@ bool MythUIStateType::DisplayState(const QString &name)
                 m_CurrentState->SetVisible(true);
         }
     }
+    AdjustDependence();
 
     return (m_CurrentState != NULL);
 }
@@ -141,6 +143,7 @@ bool MythUIStateType::DisplayState(StateType type)
                 m_CurrentState->SetVisible(true);
         }
     }
+    AdjustDependence();
 
     return (m_CurrentState != NULL);
 }
@@ -364,3 +367,23 @@ void MythUIStateType::RecalculateArea(bool recurse)
     }
 }
 
+void MythUIStateType::AdjustDependence(void)
+{
+    if (m_CurrentState == NULL || !m_CurrentState->IsVisible())
+    {
+        emit DependChanged(true);
+        return;
+    }
+    QList<MythUIType *> *children = m_CurrentState->GetAllChildren();
+    QList<MythUIType *>::iterator it = children->begin();
+
+    for (; it != children->end(); ++it)
+    {
+        if ((*it)->IsVisible())
+        {
+            emit DependChanged(false);
+            return;
+        }
+    }
+    emit DependChanged(true);
+}

mythtv/libs/libmythui/mythuistatetype.h

@@ -56,6 +56,7 @@ class MUI_PUBLIC MythUIStateType : public MythUIType
     virtual void CopyFrom(MythUIType *base);
     virtual void CreateCopy(MythUIType *parent);
     virtual void Finalize(void);
+    virtual void AdjustDependence(void);
 
     QMap<QString, MythUIType *> m_ObjectsByName;
     QMap<int, MythUIType *> m_ObjectsByState;