qt代码积累

QT自适应电脑分辨率，在main函数中最前端设置如下代码

int main(int argc, char *argv[])
{
#if (QT_VERSION > QT_VERSION_CHECK(5,6,0))
    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif
    QApplication a(argc, argv);
    app app;
    return a.exec();
}

 基本控件布局设置

头文件定义对象

    QGridLayout *gridLayout;
    QGridLayout *tabserialLayout;
    QHBoxLayout *serialLayout;
    QGridLayout *tabwifiLayout;

源文件设置布局格式和参数

    gridLayout = new QGridLayout;
    gridLayout->addWidget(ui.tabWidget);
    gridLayout->setContentsMargins(0,0,0,0);
    ui.mainwidget->setLayout(gridLayout);

    /*************************************************************/
    tabserialLayout = new QGridLayout;
    tabserialLayout->addWidget(ui.groupBoxSerial,0,0);//网格布局中的位置设置
    tabserialLayout->addWidget(ui.groupBoxCtrl,1,0);
    tabserialLayout->addWidget(ui.groupBoxMsg,2,0);

    ui.groupBoxSerial->setFixedHeight(40);//设置布局时候固定高度
    tabserialLayout->setRowStretch(1,1);//剩余空间自动伸缩
    tabserialLayout->setRowStretch(2,1);

    tabserialLayout->setContentsMargins(0,0,0,0);
    ui.tabserial->setLayout(tabserialLayout);//将布局放在哪个控件中

    serialLayout = new QHBoxLayout;//水平布局
    serialLayout->addWidget(ui.label_serialname);
    serialLayout->addWidget(ui.comboBox_serialname);
    ui.label_serialname->setFixedWidth(50);
    ui.comboBox_serialname->setFixedWidth(200);

    serialLayout->addWidget(ui.label_bauderate);
    serialLayout->addWidget(ui.comboBox_bauderate);
    ui.label_bauderate->setFixedWidth(50);
    ui.comboBox_bauderate->setFixedWidth(70);

    serialLayout->addWidget(ui.label_databit);
    serialLayout->addWidget(ui.comboBox_databit);
    ui.label_databit->setFixedWidth(50);
    ui.comboBox_databit->setFixedWidth(70);

    serialLayout->addWidget(ui.label_stopbit);
    serialLayout->addWidget(ui.comboBox_stopbit);
    ui.label_stopbit->setFixedWidth(50);
    ui.comboBox_stopbit->setFixedWidth(70);

    serialLayout->addWidget(ui.label_paritybit);
    serialLayout->addWidget(ui.comboBox_paritybit);
    ui.label_paritybit->setFixedWidth(50);
    ui.comboBox_paritybit->setFixedWidth(70);

    serialLayout->addWidget(ui.OpenSerialPort);
    ui.OpenSerialPort->setFixedWidth(100);

    serialLayout->setContentsMargins(10,0,0,0);
    serialLayout->setAlignment(Qt::AlignLeft);

    ui.groupBoxSerial->setLayout(serialLayout);