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1a59599388
The previous CAST_MOD(Impl) for the action_router constructor was illegal because `this` is not yet of type Impl (because the subclass constructor has not run yet). The action_router now accepts std::function for its callbacks. Fixes #2519
60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
#pragma once
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#include <cassert>
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#include <stdexcept>
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#include <unordered_map>
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#include "common.hpp"
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POLYBAR_NS
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/**
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* Maps action names to lambdas and invokes them.
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*
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* Each module has one instance of this class and uses it to register action.
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* For each action the module has to register the name, whether it can take
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* additional data, and a callback that is called whenever the action is triggered.
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*
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* The input() function in the base class uses this for invoking the actions
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* of that module.
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*
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* Any module that does not reimplement that function will automatically use
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* this class for action routing.
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*/
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class action_router {
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using callback = std::function<void(void)>;
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using callback_data = std::function<void(const std::string&)>;
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public:
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void register_action(const string& name, callback func);
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void register_action_with_data(const string& name, callback_data func);
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bool has_action(const string& name);
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void invoke(const string& name, const string& data);
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protected:
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struct entry {
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union {
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callback without;
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callback_data with;
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};
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bool with_data;
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entry(callback func);
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entry(callback_data func);
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~entry();
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};
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template <typename F>
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void register_entry(const string& name, const F& e) {
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if (has_action(name)) {
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throw std::invalid_argument("Tried to register action '" + name + "' twice. THIS IS A BUG!");
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}
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callbacks.emplace(name, std::move(e));
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}
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private:
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std::unordered_map<string, entry> callbacks;
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};
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POLYBAR_NS_END
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