Qt 利用状态机改变按钮QToolButton/QPushButton正常、悬浮、选中三种状态的图标及文字等

可以从Qt助手搜索QEventTransition看到官方帮助文档例子

void setButtonStyle(const QString& _route){
	//读取配置文件及操作见之前的博客通用读写ini文件
	QIcon open_normal_icon=QIcon(_rounte+"open_normal.png");
	QIcon open_hover_icon=QIcon(_rounte+"open_hover.png");
	QIcon open_pressed_icon=QIcon(_rounte+"open_pressed.png");
    
	QStateMachine *machine = new QStateMachine(this);
    QState *open_normal = new QState();
    QState *open_hover = new QState();
    QState *open_pressed = new QState();
    
    // 每个状态对应的改变
    open_normal->assignProperty(button, "text", "Outside");
    open_normal->assignProperty(button, "icon", open_normal_icon);
    open_hover->assignProperty(button, "text", "Inside");
    open_hover->assignProperty(button, "icon", open_hover_icon);
    open_pressed->assignProperty(button, "text", "Pressing...");
    open_pressed->assignProperty(button, "icon", open_pressed_icon);
    
    //添加状态对应的过度
    //从正常状态到悬浮状态（就是鼠标在按钮上）
    QEventTransition *normalTransition = new QEventTransition(button, QEvent::Enter);
    normalTransition->setTargetState(open_hover);//目标状态，从当前状态到对应的状态
    open_normal->addTransition(normalTransition);//当前状态

	//从悬浮状态到正常状态（鼠标不在按钮上）
	QEventTransition *hoverTransition = new QEventTransition(button, QEvent::Leave);
    hoverTransition->setTargetState(open_normal);
    open_hover->addTransition(hoverTransition);
    
    //从悬浮状态到选中状态（鼠标点击事件）
    QEventTransition *pressTransition = new QEventTransition(button, QEvent::MouseButtonPress);
    pressTransition->setTargetState(open_pressed);
    open_hover->addTransition(pressTransition);
    
	//从选中状态到悬浮状态（鼠标点击释放事件）
    QEventTransition *releaseTransition = new QEventTransition(button, QEvent::MouseButtonRelease);
    releaseTransition->setTargetState(open_hover);
    open_pressed->addTransition(releaseTransition);
    
    //添加状态
    machine->addState(open_normal);
    machine->addState(open_hover);
    machine->addState(open_pressed);

	//初始化状态
    machine->setInitialState(open_normal);
    
    //开启状态机服务
    machine->start();
}