Asynchronous component instantiation

This introduces two main:

    * the QML compiler executes in a separate thread
    * item instantiation can be interrupted and resumed to
      allow it to be split across multiple frames.

Task-number: QTBUG-21151
Change-Id: I9631c62bb77da3a2e0c37f0da3719533fdce4fef
Reviewed-on: http://codereview.qt-project.org/5676
Reviewed-by: Martin Jones <martin.jones@nokia.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/declarative/qml/ftw/qfieldlist_p.h b/src/declarative/qml/ftw/qfieldlist_p.h
index ff6b89b96f..f0efd16a20 100644
--- a/src/declarative/qml/ftw/qfieldlist_p.h
+++ b/src/declarative/qml/ftw/qfieldlist_p.h
@@ -61,6 +61,8 @@ class QFieldList
 public:
     inline QFieldList();
     inline N *first() const;
+    inline N *takeFirst();
+
     inline void append(N *);
     inline void prepend(N *);
 
@@ -73,6 +75,8 @@ public:
     inline void prepend(QFieldList<N, nextMember> &);
     inline void insertAfter(N *, QFieldList<N, nextMember> &);
 
+    inline void copyAndClear(QFieldList<N, nextMember> &);
+
     static inline N *next(N *v);
 
 private:
@@ -94,6 +98,21 @@ N *QFieldList<N, nextMember>::first() const
 }
 
 template<class N, N *N::*nextMember>
+N *QFieldList<N, nextMember>::takeFirst()
+{
+    N *value = _first;
+    if (value) {
+        _first = next(value);
+        if (_last == value) {
+            Q_ASSERT(_first == 0);
+            _last = 0;
+        }
+        --_count;
+    } 
+    return value;
+}
+
+template<class N, N *N::*nextMember>
 void QFieldList<N, nextMember>::append(N *v)
 {
     Q_ASSERT(v->*nextMember == 0);
@@ -207,4 +226,14 @@ void QFieldList<N, nextMember>::insertAfter(N *after, QFieldList<N, nextMember>
     }
 }
 
+template<class N, N *N::*nextMember>
+void QFieldList<N, nextMember>::copyAndClear(QFieldList<N, nextMember> &o)
+{
+    _first = o._first;
+    _last = o._last;
+    _count = o._count;
+    o._first = o._last = 0;
+    o._count = 0;
+}
+
 #endif // QFIELDLIST_P_H