55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
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#pragma once
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#include <string>
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#include <vector>
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class Command {
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public:
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virtual ~Command() {}
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std::string stored_name;
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std::string get_name() {
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if(stored_name.empty())
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stored_name = fetch_name();
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return stored_name;
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}
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virtual std::string fetch_name() = 0;
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virtual void undo() = 0;
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virtual void execute() = 0;
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};
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class UndoStack {
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public:
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template<class T>
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T& new_command() {
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// if we are in the middle of the stack currently, wipe out everything and start fresh
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// TODO: only do it up to the point we're modifing
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if(stack_position != (command_stack.size() - 1)) {
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command_stack.clear();
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stack_position = -1;
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}
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stack_position++;
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return static_cast<T&>(*command_stack.emplace_back(std::make_unique<T>()));
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}
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//void push_command(Command* command);
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void undo();
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void redo();
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// useful for undo
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Command* get_last_command();
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// useful for redo
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Command* get_next_command();
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std::vector<std::unique_ptr<Command>> command_stack;
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int stack_position = -1;
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};
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