From 64ec1cfa42c0cfe99db6c1f125c2f940bc134fcf Mon Sep 17 00:00:00 2001
From: kiritow <1362050620@qq.com>
Date: Tue, 2 May 2017 13:37:03 +0800
Subject: [PATCH] Add Event Looper

---
 MiniEngine_Event.cpp | 64 ++++++++++++++++++++++++++++++++++++++++++++
 MiniEngine_Event.h   | 27 +++++++++++++++++++
 2 files changed, 91 insertions(+)

diff --git a/MiniEngine_Event.cpp b/MiniEngine_Event.cpp
index 16b8e29..4e874c5 100644
--- a/MiniEngine_Event.cpp
+++ b/MiniEngine_Event.cpp
@@ -19,3 +19,67 @@ int PushEvent(const Event& refEvent)
 {
     return SDL_PushEvent(const_cast<Event*>(&refEvent));
 }
+
+
+Looper::Looper()
+{
+    _update=_running=true;
+}
+void Looper::add(decltype(Event::type) event_type,const std::function<int(Looper&,Event&)>& event_callback)
+{
+    _evmap[event_type].push_back(event_callback);
+}
+void Looper::add(decltype(Event::type) event_type,const std::function<int(Event&)>& event_callback)
+{
+    _evmap[event_type].push_back([&](Looper& lp,Event& ev)->int{return event_callback(ev);});
+}
+void Looper::add(decltype(Event::type) event_type,const std::function<void(Looper&,Event&)>& event_callback)
+{
+    _evmap[event_type].push_back([&](Looper& lp,Event& ev)->int{event_callback(lp,ev); return 0;});
+}
+void Looper::add(decltype(Event::type) event_type,const std::function<void(Event&)>& event_callback)
+{
+    _evmap[event_type].push_back([&](Looper& lp,Event& ev)->int{event_callback(ev); return 0;});
+}
+void Looper::dispatch()
+{
+    for(auto callback:_evmap[_e.type])
+    {
+        if(callback(*this,_e)) break;
+    }
+}
+void Looper::run()
+{
+    while(_running)
+    {
+        while(!_update&&WaitEvent(_e))
+        {
+            dispatch();
+        }
+
+        _update=false;
+    }
+}
+Event Looper::GetLastEvent()
+{
+    return _e;
+}
+void Looper::needupdate()
+{
+    _update=true;
+}
+void Looper::needstop()
+{
+    _running=false;
+}
+void Looper::stop()
+{
+    needstop();
+    needupdate();
+}
+void Looper::reset()
+{
+    _running=true;
+    _update=true;
+    _evmap.clear();
+}
diff --git a/MiniEngine_Event.h b/MiniEngine_Event.h
index 8c92434..aa3a4f6 100644
--- a/MiniEngine_Event.h
+++ b/MiniEngine_Event.h
@@ -1,5 +1,7 @@
 #pragma once
 #include "MiniEngine.h"
+#include <map>
+#include <list>
 
 typedef SDL_Event Event;
 
@@ -7,3 +9,28 @@ int PollEvent(Event& refEvent);
 int WaitEvent(Event& refEvent);
 int WaitEventTimeout(Event& refEvent,int ms);
 int PushEvent(const Event& refEvent);
+
+class Looper
+{
+public:
+    Looper();
+    /// If Callback does not return 0, then stop transferring this event.
+    void add(decltype(Event::type) event_type,const std::function<int(Looper&,Event&)>& event_callback);
+    /// If Callback does not return 0, then stop transferring this event. (Discards Looper)
+    void add(decltype(Event::type) event_type,const std::function<int(Event&)>& event_callback);
+    /// If Callback has no return (void), then we assume it return 0.
+    void add(decltype(Event::type) event_type,const std::function<void(Looper&,Event&)>& event_callback);
+    /// If Callback has no return (void), then we assume it return 0. (Discards Looper)
+    void add(decltype(Event::type) event_type,const std::function<void(Event&)>& event_callback);
+    void dispatch();
+    void run();
+    Event GetLastEvent();
+    void needupdate();
+    void needstop();
+    void stop();
+    void reset();
+private:
+    Event _e;
+    bool _running,_update;
+    std::map<decltype(Event::type),std::list<std::function<int(Looper&,Event&)>>> _evmap;
+};