在qt中创建qstate [英] Create a qstate in qt

问题描述

如果我有一个简单的状态机，像

  switch（state）
 {
 case state_1：
 doSomething（）; 
 state = state_2; 
 break; 
 case state_2：
 doSomething_2（）; 
 state = state_finished; 
 break; 
} 
  

如何将这个简单的状态机转换为qstate转换？

解决方案

这将是这样的例子：

 code> TestClass test_class; 
 QStateMachine machine; 
 
 QState * state_1 = new QState（& machine）; 
 QObject :: connect（state_1，SIGNAL（entered（）），& test_class，SLOT（doSomething1（）））; 
 
 QState * state_2 = new QState（& machine）; 
 QObject :: connect（state_2，SIGNAL（entered（）），& test_class，SLOT（doSomething2（）））; 
 
 QFinalState * state_finished = new QFinalState（& machine）; 
 TestClassFinishedTransition * finished_transition = 
 new TestClassFinishedTransition（& test_class）; 
 finished_transition-> setTargetState（state_finished）; 
 state_2-> addTransition（finished_transition）; 
 
 machine.setInitialState（state_1）; 
 machine.start（）; 
  

TestClass是基于 QObject 的类。 / p>

我希望这段代码能帮助你开始理解这个概念。但是，您必须仔细阅读文档，并通过提供的示例Qt。

If I have a simple state machine like that

  switch(state)
    {
    case state_1:
      doSomething();
    state = state_2;
    break;
    case state_2:
    doSomething_2();
state = state_finished;
    break;
    }

how would I convert this simple state machine into qstate with transitions ?

解决方案

It would be for example something like this:

TestClass test_class;
QStateMachine machine;

QState *state_1 = new QState(&machine);
QObject::connect(state_1, SIGNAL(entered()), &test_class, SLOT(doSomething1()));

QState *state_2 = new QState(&machine);
QObject::connect(state_2, SIGNAL(entered()), &test_class, SLOT(doSomething2()));

QFinalState *state_finished = new QFinalState(&machine);
TestClassFinishedTransition *finished_transition = 
                                new TestClassFinishedTransition(&test_class);
finished_transition->setTargetState(state_finished);
state_2->addTransition(finished_transition);

machine.setInitialState(state_1);
machine.start();

TestClass would be QObject based class.

I hope this piece of code helps you to get started in understanding the concept. However, you have to read the documentation carefully and go through examples provided by Qt.

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