1.Qt 状态机（Qstate）的学习日志1(2021.09.29)

#include <QPushButton>
#include <QState>
#include <QStateMachine>
#include <QPropertyAnimation>
#include <QAbstractTransition>
#include <QSignalTransition>
/*
不同的动画效果
enum Type {
    Linear,
    InQuad, OutQuad, InOutQuad, OutInQuad,
    InCubic, OutCubic, InOutCubic, OutInCubic,
    InQuart, OutQuart, InOutQuart, OutInQuart,
    InQuint, OutQuint, InOutQuint, OutInQuint,
    InSine, OutSine, InOutSine, OutInSine,
    InExpo, OutExpo, InOutExpo, OutInExpo,
    InCirc, OutCirc, InOutCirc, OutInCirc,
    InElastic, OutElastic, InOutElastic, OutInElastic,
    InBack, OutBack, InOutBack, OutInBack,
    InBounce, OutBounce, InOutBounce, OutInBounce,
    InCurve, OutCurve, SineCurve, CosineCurve,
    BezierSpline, TCBSpline, Custom, NCurveTypes
};
*/

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
//1.创建状态机
    QStateMachine *machine = new QStateMachine();
//2.创建状态
    QState *qst1 = new QState();
    QState *qst2 = new QState();
    QState *qst3 = new QState();
    
//3.状态机添加状态和初始化状态机的状态
	machine->addState(qst1);
	machine->addState(qst2);
	machine->addState(qst3);
    machine->setInitialState(qst1);
    
//4.编写各个状态的要做的事
    qst1->assignProperty(ui->val,"text","1");
    //ui->val是按钮  "text"是属性  "1"是要改成属性值
    qst1->assignProperty(ui->val,"geometry",QRect(100,10,50,50));

    qst2->assignProperty(ui->val,"text","2");
    qst2->assignProperty(ui->val,"geometry",QRect(100,100,100,100));

    qst3->assignProperty(ui->val,"text","3");
    qst3->assignProperty(ui->val,"geometry",QRect(100,200,200,200));
	
//5.创建位置变化的动画效果
	//QPropertyAnimation是动画类
    QPropertyAnimation *anim = new QPropertyAnimation(ui->val,"geometry");
    //设置动画时长
    anim->setDuration(500);
    //设置动画类型
    anim->setEasingCurve(QEasingCurve::InOutBack); 
//6.设置触发条件与添加动画效果
    (qst2->addTransition(ui->btn,SIGNAL(clicked(bool)),qst3))->addAnimation(anim);
    //当btn按钮按下状态切换到qst3，addAnimation为添加切换动画效果
    (qst3->addTransition(ui->btn,SIGNAL(clicked(bool)),qst1))->addAnimation(anim);
    (qst1->addTransition(ui->btn,SIGNAL(clicked(bool)),qst2))->addAnimation(anim);
//开始状态机
    machine->start();
}

效果图