+
+#ifndef DALI_TOOLKIT_INTERNAL_ROUND_ROBIN_CONTAINER_VIEW_H
+#define DALI_TOOLKIT_INTERNAL_ROUND_ROBIN_CONTAINER_VIEW_H
+
+/*
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// EXTERNAL INCLUDES
+#include <cstddef>
+#include <vector>
+
+namespace Dali
+{
+
+namespace Toolkit
+{
+
+namespace Internal
+{
+
+/**
+ * @brief RoundRobinContainerView is a view to a container that allows iterating through the elements cyclically.
+ */
+template<typename T>
+class RoundRobinContainerView
+{
+public:
+ using ContainerType = std::vector<T>;
+
+ /**
+ * @brief Constructs a new RoundRobinControlView with the given number elements using the provided factory.
+ * @param[in] numberOfElements The number of elements in the container
+ * @param[in] factory Factory function of functor that will be used to create instances of the elements
+ */
+ template<typename FactoryType>
+ RoundRobinContainerView(size_t numberOfElements, const FactoryType& factory)
+ : mElements(),
+ mNextIndex{}
+ {
+ mElements.reserve(numberOfElements);
+ for(unsigned i = {}; i < numberOfElements; ++i)
+ {
+ mElements.push_back(factory());
+ }
+ }
+
+ /**
+ * @brief Reset the position of the iterator returned by GetNext() to the first element.
+ */
+ void Reset()
+ {
+ mNextIndex = 0u;
+ }
+
+ /**
+ * @brief Returns the next element on the container.
+ * @return Iterator for the next element
+ */
+ typename ContainerType::iterator GetNext()
+ {
+ SetValidNextIndex();
+
+ return mElements.begin() + mNextIndex++;
+ }
+
+ /**
+ * @brief Returns the iterator to the end of the container.
+ *
+ * Can be used to compare against GetNext() to check if the container is empty.
+ *
+ * @return The container end() element
+ */
+ typename ContainerType::const_iterator End() const
+ {
+ return mElements.cend();
+ }
+
+ // default members
+ ~RoundRobinContainerView() = default;
+
+ RoundRobinContainerView(const RoundRobinContainerView&) = delete;
+ RoundRobinContainerView& operator=(const RoundRobinContainerView&) = delete;
+ RoundRobinContainerView(RoundRobinContainerView&&) = default;
+ RoundRobinContainerView& operator=(RoundRobinContainerView&&) = default;
+
+private:
+ /**
+ * @brief Check the current index and reset if necessary.
+ */
+ void SetValidNextIndex()
+ {
+ if(mNextIndex >= mElements.size())
+ {
+ Reset();
+ }
+ }
+
+private:
+ ContainerType mElements; //< container of elements
+ size_t mNextIndex; //< index to the next element to be viewed
+};
+
+} // namespace Internal
+
+} // namespace Toolkit
+
+} // namespace Dali
+
+
+#endif // DALI_TOOLKIT_INTERNAL_ROUND_ROBIN_CONTAINER_VIEW_H
projects / platform / core / uifw / dali-toolkit.git / commitdiff