Add an is<PropertyName>Immutable to know if a property is immutable

Summary:
Add a utility function is<Parameter>Immutable to access immutability quickly.
Generated classes uses them internally to avoid code redundance.

Sample:
```
    /**
      Set blocked-by-default
    */
    void setBlockedByDefault( bool v )
    {
      if (v != mBlockedByDefault && !isBlockedByDefaultImmutable() )  {
        mBlockedByDefault = v;
        Q_EMIT blockedByDefaultChanged();
      }
    }

    /**
      Is blocked-by-default Immutable
    */
    bool isBlockedByDefaultImmutable()
    {
      return isImmutable( QStringLiteral( "blockedByDefault" ) );
    }
```

```
    /**
      Set org.kde.ActivityManager.ResourceScoringEnabled
    */
    void setResourceScoringEnabled( bool v )
    {
      if (!isResourceScoringEnabledImmutable() )
        mResourceScoringEnabled = v;
    }

    /**
      Is org.kde.ActivityManager.ResourceScoringEnabled Immutable
    */
    bool isResourceScoringEnabledImmutable()
    {
      return isImmutable( QStringLiteral( "resourceScoringEnabled" ) );
    }
```

Reviewers: ervin, #frameworks, dfaure

Reviewed By: ervin

Subscribers: dfaure, tcanabrava, kde-frameworks-devel

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D26368

1 files changed, 18 insertions, 2 deletions

diff --git a/autotests/kconfig_compiler/test8a.h.ref b/autotests/kconfig_compiler/test8a.h.ref
index 3e890946..9e9c0f4e 100644
--- a/autotests/kconfig_compiler/test8a.h.ref
+++ b/autotests/kconfig_compiler/test8a.h.ref
@@ -20,7 +20,7 @@ class Test8a : public KConfigSkeleton
     */
     void setFont( const QFont & v )
     {
-      if (!isImmutable( QStringLiteral( "Font" ) ))
+      if (!isFontImmutable())
         mFont = v;
     }
 
@@ -33,11 +33,19 @@ class Test8a : public KConfigSkeleton
     }
 
     /**
+      Is Font Immutable
+    */
+    bool isFontImmutable() const
+    {
+      return isImmutable( QStringLiteral( "Font" ) );
+    }
+
+    /**
       Set TitleFont
     */
     void setTitleFont( const QFont & v )
     {
-      if (!isImmutable( QStringLiteral( "TitleFont" ) ))
+      if (!isTitleFontImmutable())
         mTitleFont = v;
     }
 
@@ -49,6 +57,14 @@ class Test8a : public KConfigSkeleton
       return mTitleFont;
     }
 
+    /**
+      Is TitleFont Immutable
+    */
+    bool isTitleFontImmutable() const
+    {
+      return isImmutable( QStringLiteral( "TitleFont" ) );
+    }
+
   protected:
 
     // Group