[Unity插件]Lua行为树(十)：通用行为和通用条件节点

在行为树中，需要扩展的主要是行为节点和条件节点。一般来说，每当要创建一个节点时，就要新建一个节点文件。而对于一些简单的行为节点和条件节点，为了去掉新建文件的过程，可以写一个通用版本的行为节点和条件节点，以传入方法的方式来避免新建文件。

BTActionUniversal.lua

 --[[
 通用Action节点
 --]]
 BTActionUniversal = BTAction:New();

 local this = BTActionUniversal;
 this.name = "BTActionUniversal";

 function this:New(enterFunc, executeFunc, exitFunc)
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o.enterFunc = enterFunc;
     o.executeFunc = executeFunc;
     o.exitFunc = exitFunc;
     return o;
 end

 function this:Enter()
     if (self.enterFunc) then
         self.enterFunc();
     end
 end

 function this:Execute()
     if (self.executeFunc) then
         return self.executeFunc();
     else
         return BTTaskStatus.Failure;
     end
 end

 function this:Exit()
     if (self.exitFunc) then
         self.exitFunc();
     end
 end

BTConditionalUniversal.lua

 --[[
 通用Conditional节点
 --]]
 BTConditionalUniversal = BTConditional:New();

 local this = BTConditionalUniversal;
 this.name = "BTConditionalUniversal";

 function this:New(checkFunc)
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o.checkFunc = checkFunc;
     return o;
 end

 function this:Check()
     return self.checkFunc();
 end

TestBehaviorTree.lua

 TestBehaviorTree = BTBehaviorTree:New();

 local this = TestBehaviorTree;
 this.name = "TestBehaviorTree";

 function this:New()
     local o = {};
     setmetatable(o, self);
     self.__index = self;
     o:Init();
     return o;
 end

 function this:Init()
     local sequence = BTSequence:New();
     local conditional = self:GetBTConditionalUniversal();
     local action = self:GetBTActionUniversal();
     local log = BTLog:New("This is log!!!");
     log.name = "log";

     self:SetStartTask(sequence);

     sequence:AddChild(conditional);
     sequence:AddChild(action);
     sequence:AddChild(log);
 end

 function this:GetBTConditionalUniversal()
     local a = function ()
         return ( > );
     end
     local universal = BTConditionalUniversal:New(a);
     return universal;
 end

 function this:GetBTActionUniversal()
     local count = ;
     local a = function () print(""); end
     local b = function ()
         if (count < ) then
             count = count + ;
             print("");
             return BTTaskStatus.Running;
         else
             return BTTaskStatus.Success;
         end
     end
     local c = function () print(""); end
     local universal = BTActionUniversal:New(a, b, c);
     return universal;
 end

打印如下：