Add delayed property to Binding.

Provide a way to avoid potentially expensive or unexpected intermediate
values.

[ChangeLog][Binding] Add delayed property to Binding as a way to avoid potentially expensive or unexpected intermediate values.

Change-Id: I6aaca570859cc1344eeb9c9f19f32660e8c0b4e0
Reviewed-by: Robin Burchell <robin.burchell@viroteck.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/qml/types/qqmlbind_p.h b/src/qml/types/qqmlbind_p.h
index 581995af56..77939a40bc 100644
--- a/src/qml/types/qqmlbind_p.h
+++ b/src/qml/types/qqmlbind_p.h
@@ -68,6 +68,7 @@ class Q_AUTOTEST_EXPORT QQmlBind : public QObject, public QQmlPropertyValueSourc
     Q_PROPERTY(QString property READ property WRITE setProperty)
     Q_PROPERTY(QVariant value READ value WRITE setValue)
     Q_PROPERTY(bool when READ when WRITE setWhen)
+    Q_PROPERTY(bool delayed READ delayed WRITE setDelayed REVISION 8)
 
 public:
     QQmlBind(QObject *parent=0);
@@ -85,12 +86,16 @@ public:
     QVariant value() const;
     void setValue(const QVariant &);
 
+    bool delayed() const;
+    void setDelayed(bool);
+
 protected:
     virtual void setTarget(const QQmlProperty &);
     virtual void classBegin();
     virtual void componentComplete();
 
 private:
+    void prepareEval();
     void eval();
 };