QT信号与槽专题汇总

信号与槽机制

connect

// 方法1
connect(ui->pushButton_name, SIGNAL(Clicked(bool)),
this, SLOT(onBtnClicked(bool)));

// 方法2
connect(ui->pushButton_name, &QPushButton::clicked, this, &SetupDlg::onBtnClicked);

带参数 + 引用对象实例的槽函数（可先对对象实例进行操作）

ImagePreviewWidget *imgwidget = new ImagePreviewWidget();
imgwidget->SetBackgroundImage();
connect(this,SIGNAL(SnapshotZoomOut(int)),imgwidget,SLOT(show_min(int)));

emit

https://www.cnblogs.com/schips/p/12537360.html

Trick: QT Connect多个控件绑定同一个slot

https://blog.youkuaiyun.com/qq_21980099/article/details/119798576