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147 | /*
This file is part of KDBindings.
SPDX-FileCopyrightText: 2021 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Sean Harmer <sean.harmer@kdab.com>
SPDX-License-Identifier: MIT
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
#pragma once
#include <kdbindings/node.h>
#include <kdbindings/node_operators.h>
#include <kdbindings/node_functions.h>
#include <kdbindings/make_node.h>
#include <kdbindings/binding_evaluator.h>
#include <kdbindings/property_updater.h>
namespace KDBindings {
template<typename T, typename EvaluatorT = BindingEvaluator>
class Binding : public PropertyUpdater<T>, public Private::Dirtyable
{
static_assert(
std::is_base_of<BindingEvaluator, EvaluatorT>::value,
"The EvaluatorT type must inherit from BindingEvaluator.");
public:
explicit Binding(Private::Node<T> &&rootNode, EvaluatorT const &evaluator)
: m_rootNode{ std::move(rootNode) }
, m_evaluator{ evaluator }
{
m_bindingId = m_evaluator.insert(this);
m_rootNode.setParent(this);
}
~Binding() override
{
m_evaluator.remove(m_bindingId);
}
Binding() = delete;
Binding(Binding const &other) = delete;
Binding &operator=(Binding const &other) = delete;
// Move construction would invalidate the this pointer passed to the evaluator
// in the constructor
Binding(Binding &&other) = delete;
Binding &operator=(Binding &&other) = delete;
void setUpdateFunction(std::function<void(T &&)> const &updateFunction) override
{
m_propertyUpdateFunction = updateFunction;
}
T get() const override { return m_rootNode.evaluate(); }
void evaluate()
{
T value = m_rootNode.evaluate();
// Use this to update any associated property via the PropertyUpdater's update function
m_propertyUpdateFunction(std::move(value));
}
protected:
Private::Dirtyable **parentVariable() override { return nullptr; }
const bool *dirtyVariable() const override { return nullptr; }
Private::Node<T> m_rootNode;
EvaluatorT m_evaluator;
std::function<void(T &&)> m_propertyUpdateFunction = [](T &&) {};
int m_bindingId = -1;
};
template<typename T, typename EvaluatorT>
inline std::unique_ptr<Binding<T, EvaluatorT>> makeBinding(EvaluatorT &evaluator, Property<T> &property)
{
return std::make_unique<Binding<T, EvaluatorT>>(Private::makeNode(property), evaluator);
}
template<typename T, typename EvaluatorT>
inline std::unique_ptr<Binding<T, EvaluatorT>> makeBinding(EvaluatorT &evaluator, Private::Node<T> &&rootNode)
{
return std::make_unique<Binding<T, EvaluatorT>>(std::move(rootNode), evaluator);
}
template<typename EvaluatorT, typename Func, typename... Args, typename = std::enable_if_t<sizeof...(Args) != 0>, typename ResultType = Private::operator_node_result_t<Func, Args...>>
inline std::unique_ptr<Binding<ResultType, EvaluatorT>> makeBinding(EvaluatorT &evaluator, Func &&func, Args &&...args)
{
return std::make_unique<Binding<ResultType, EvaluatorT>>(Private::makeNode(std::forward<Func>(func), std::forward<Args>(args)...), evaluator);
}
template<typename T>
class Binding<T, ImmediateBindingEvaluator> : public Binding<T, BindingEvaluator>
{
public:
explicit Binding(Private::Node<T> &&rootNode)
: Binding<T, BindingEvaluator>(std::move(rootNode), ImmediateBindingEvaluator::instance())
{
}
Binding() = delete;
virtual ~Binding() = default;
Binding(Binding const &other) = delete;
Binding &operator=(Binding const &other) = delete;
Binding(Binding &&other) = delete;
Binding &operator=(Binding &&other) = delete;
void markDirty() override
{
Binding::evaluate();
}
};
template<typename T>
inline std::unique_ptr<Binding<T, ImmediateBindingEvaluator>> makeBinding(Property<T> &property)
{
return std::make_unique<Binding<T, ImmediateBindingEvaluator>>(Private::makeNode(property));
}
template<typename T>
inline std::unique_ptr<Binding<T, ImmediateBindingEvaluator>> makeBinding(Private::Node<T> &&rootNode)
{
return std::make_unique<Binding<T, ImmediateBindingEvaluator>>(std::move(rootNode));
}
template<typename Func, typename... Args, typename = std::enable_if_t<sizeof...(Args) != 0>, typename ResultType = Private::operator_node_result_t<Func, Args...>>
inline std::unique_ptr<Binding<ResultType, ImmediateBindingEvaluator>> makeBinding(Func &&func, Args &&...args)
{
return std::make_unique<Binding<ResultType, ImmediateBindingEvaluator>>(Private::makeNode(std::forward<Func>(func), std::forward<Args>(args)...));
}
template<typename... T>
inline auto makeBoundProperty(T &&...args)
{
auto binding = makeBinding(std::forward<T>(args)...);
return Property<decltype(binding->get())>(std::move(binding));
}
} // namespace KDBindings
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