From 2ecddc44e79682f84e864a22018603d0dd0312b4 Mon Sep 17 00:00:00 2001
From: kiritow <1362050620@qq.com>
Date: Tue, 2 May 2017 20:51:56 +0800
Subject: [PATCH] Add Poller

Add implement of Looper::operator -
---
 MiniEngine_Event.cpp | 40 ++++++++++++++++++++++++++++++++++++++++
 MiniEngine_Event.h   | 15 ++++++++++++++-
 2 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/MiniEngine_Event.cpp b/MiniEngine_Event.cpp
index 92469ca..3f42628 100644
--- a/MiniEngine_Event.cpp
+++ b/MiniEngine_Event.cpp
@@ -29,6 +29,7 @@ Looper::Looper()
 {
     _update=_running=true;
     _loop_cnt=0;
+    updater=[](){};
 }
 LooperID Looper::add(_SDLEventType_ event_type,const std::function<int(Looper&,Event&)>& event_callback)
 {
@@ -149,6 +150,11 @@ bool Looper::remove(const LooperID& looperid)
     return false;
 }
 
+bool Looper::operator -(const LooperID& looperid)
+{
+    return remove(looperid);
+}
+
 void Looper::dispatch()
 {
     for(auto callbackPack:_evmap[_e.type])
@@ -165,6 +171,8 @@ void Looper::run()
             dispatch();
         }
 
+        updater();
+
         _update=false;
     }
 }
@@ -191,4 +199,36 @@ void Looper::reset()
     _update=true;
     _evmap.clear();
     _loop_cnt=0;
+    updater=[](){};
+}
+
+Poller::Poller()
+{
+    idler=[](){};
+}
+
+void Poller::reset()
+{
+    Looper::reset();
+    idler=[](){};
+}
+
+void Poller::run()
+{
+    int pollret=1;
+    while(_running)
+    {
+        while(!_update&&(pollret=PollEvent(_e)))
+        {
+            dispatch();
+        }
+
+        /// If pollret is not 0 (new event requests update), or pollret is 0 (No New Event) but Idle function requests update, then call update.
+        if(!pollret) idler();
+        if(_update)
+        {
+            updater();
+            _update=false;
+        }
+    }
 }
diff --git a/MiniEngine_Event.h b/MiniEngine_Event.h
index 85ac06f..91217b2 100644
--- a/MiniEngine_Event.h
+++ b/MiniEngine_Event.h
@@ -56,9 +56,22 @@ public:
     void needstop();
     void stop();
     void reset();
-private:
+
+    std::function<void()> updater;
+
+protected:
     Event _e;
     bool _running,_update;
     std::map<_SDLEventType_,std::list<std::pair<int,std::function<int(Looper&,Event&)>>>> _evmap;
     int _loop_cnt;
 };
+
+class Poller : public Looper
+{
+public:
+    Poller();
+    void run();
+    void reset();
+
+    std::function<void()> idler;
+};