Qt状态机事件处理例程！！

#include "widget.h" #include "ui_widget.h" #include <QVBoxLayout> #include <QPushButton> #include <QStateMachine> #include <QState> #include <QEventTransition> #include <QDebug> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); QPushButton *button = new QPushButton(this); button->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(button); layout->setContentsMargins(80, 80, 80, 80); setLayout(layout); QStateMachine *machine = new QStateMachine(this); QState *s1 = new QState(); s1->assignProperty(button, "text", "Outside"); QState *s2 = new QState(); s2->assignProperty(button, "text", "Inside"); QEventTransition *enterTransition = new QEventTransition(button, QEvent::Enter); enterTransition->setTargetState(s2); s1->addTransition(enterTransition); QEventTransition *leaveTransition = new QEventTransition(button, QEvent::Leave); leaveTransition->setTargetState(s1); s2->addTransition(leaveTransition); QState *s3 = new QState(); s3->assignProperty(button, "text", "Pressing..."); QEventTransition *pressTransition = new QEventTransition(button, QEvent::MouseButtonPress); pressTransition->setTargetState(s3); s2->addTransition(pressTransition); QEventTransition *releaseTransition = new QEventTransition(button, QEvent::MouseButtonRelease); releaseTransition->setTargetState(s2); s3->addTransition(releaseTransition); machine->addState(s1); machine->addState(s2); machine->addState(s3); machine->setInitialState(s1); machine->start(); } Widget::~Widget() { delete ui; } void Widget::showDebug() { qDebug()<<"Pressing..."; }