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util-event: Listen, Silence callbacks and other operators

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This commit is contained in:
Michael Fabian 'Xaymar' Dirks 2019-01-23 20:00:35 +01:00
parent 9848c5aa28
commit 52af973014
1 changed files with 59 additions and 12 deletions
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71
source/util-event.hpp
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@ -26,40 +26,87 @@ namespace util {
class event {
std::list<std::function<void(_args...)>> listeners;
public:
void add(std::function<void(_args...)> listener)
std::function<void()> listen_cb;
std::function<void()> silence_cb;
public /* functions */:
// Add new listener.
inline void add(std::function<void(_args...)> listener)
{
if (listeners.size() == 0) {
if (listen_cb) {
listen_cb();
}
}
listeners.push_back(listener);
}
void remove(std::function<void(_args...)> listener)
// Remove existing listener.
inline void remove(std::function<void(_args...)> listener)
{
listeners.remove(listener);
if (listeners.size() == 0) {
if (silence_cb) {
silence_cb();
}
}
}
// Not valid without the extra template.
// Check if empty / no listeners.
inline bool empty()
{
return listeners.empty();
}
// Remove all listeners.
inline void clear()
{
listeners.clear();
if (silence_cb) {
silence_cb();
}
}
public /* operators */:
// Call Listeners with arguments.
/// Not valid without the extra template.
template<typename... _largs>
void operator()(_args... args)
inline void operator()(_args... args)
{
for (auto& l : listeners) {
l(args...);
}
}
operator bool()
// Convert to bool (true if not empty, false if empty).
inline operator bool()
{
return !listeners.empty();
return !this->empty();
}
public:
bool empty()
// Add new listener.
inline event<_args...>& operator+=(std::function<void(_args...)> listener)
{
return listeners.empty();
this->add(listener);
return *this;
}
void clear()
// Remove existing listener.
inline event<_args...>& operator-=(std::function<void(_args...)> listener)
{
listeners.clear();
this->remove(listener);
return *this;
}
public /* events */:
void set_listen_callback(std::function<void()> cb)
{
this->listen_cb = cb;
}
void set_silence_callback(std::function<void()> cb)
{
this->silence_cb = cb;
}
};
} // namespace util