60 lines
1.2 KiB
C++
60 lines
1.2 KiB
C++
#pragma once
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#include <cstdint>
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#include <memory>
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#include <utility>
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#include <vector>
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#include "common/history.hh"
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namespace nf7 {
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template <typename T>
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class GenericHistory : public History {
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public:
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GenericHistory() = delete;
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GenericHistory(Env& env) noexcept : env_(&env) {
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}
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GenericHistory(const GenericHistory&) = delete;
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GenericHistory(GenericHistory&&) = default;
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GenericHistory& operator=(const GenericHistory&) = delete;
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GenericHistory& operator=(GenericHistory&&) = default;
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void Add(std::unique_ptr<T>&& cmd) noexcept {
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cmds_.erase(cmds_.begin()+static_cast<intmax_t>(cursor_), cmds_.end());
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cmds_.push_back(std::move(cmd));
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cursor_++;
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}
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void Clear() noexcept {
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cmds_.clear();
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}
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void UnDo() {
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if (cursor_ <= 0) return;
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cmds_[cursor_-1]->Revert();
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--cursor_;
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}
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void ReDo() {
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if (cursor_ >= cmds_.size()) return;
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cmds_[cursor_]->Apply();
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++cursor_;
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}
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T* prev() const noexcept {
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return cursor_ > 0? cmds_[cursor_-1].get(): nullptr;
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}
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T* next() const noexcept {
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return cursor_ < cmds_.size()? cmds_[cursor_].get(): nullptr;
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}
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private:
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Env* const env_;
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std::vector<std::unique_ptr<T>> cmds_;
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size_t cursor_ = 0;
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};
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} // namespace nf7
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