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refs #759 Allow cache value notification slot to be changed after construction.

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Also allow slot to be any type of callable, including member function or lambda.
This commit is contained in:
Mathew Sutcliffe
2016-09-09 00:49:08 +01:00
committed by Roland Winklmeier
parent d24c17eba2
commit e01ae2be11
6 changed files with 71 additions and 52 deletions
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27
src/blackmisc/valuecacheprivate.h
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@@ -28,19 +28,20 @@ namespace BlackMisc
{
/*!
* \private Identity type trait.
* \private Trait for obtaining the class type of a pointer to member type, or QObject if T is not a pointer to member.
*/
template <typename T>
struct TIdentity
struct TClassOfPointerToMember
{
using type = QObject;
};
//! \cond
template <typename T, typename M>
struct TClassOfPointerToMember<M T::*>
{
using type = T;
};
/*!
* \private Trick to force a non-deduced context during template argument type deduction.
*/
template <typename T>
using TNonDeduced = typename TIdentity<T>::type;
//! \endcond
/*!
* \private QObject subclass used by CCached<T> class template for signal/slot communication with CValueCache.
@@ -61,8 +62,8 @@ namespace BlackMisc
//! Functor used for validating values.
using Validator = std::function<bool(const CVariant &)>;
//! Pointer-to-member-function type of slot to notify parent of changes.
using NotifySlot = void (QObject:: *)();
//! Functor used to notify parent of changes.
using NotifySlot = std::function<void(QObject *)>;
//! Returns a new instance of the opaque Element type for use by CCached<T> to interact with CValuePage.
//! \param key The key string of the value in the cache.
@@ -70,8 +71,10 @@ namespace BlackMisc
//! \param metaType The Qt metatype ID of the value object's expected type.
//! \param validator Optional functor which returns true if the value is valid.
//! \param defaultValue Optional value which is used in case the value is invalid.
//! \param slot Optional member function of parent, will be called when value changes.
Element &createElement(const QString &key, const QString &name, int metaType, Validator validator, const CVariant &defaultValue, NotifySlot slot);
Element &createElement(const QString &key, const QString &name, int metaType, Validator validator, const CVariant &defaultValue);
//! Set the functor to call to notify that the value corresponding to the element's key was modified.
void setNotifySlot(Element &element, NotifySlot slot);
//! True if the currently paged value is a valid instance of the given type.
//! \threadsafe