QGridLayout用法

刚开始用Qt布局管理的时候，发现界面管理没有先前认为的那样简单了，布局中控件的对齐、大小、间距等，都需要在代码中设置。但是当你用熟了这些设置，Qt的界面管理就变成一件轻松愉快的事情了。。。

先看代码：

  RsData::RsData(QWidget *parent,Qt::WindowFlags fl)
	:QWidget(parent,fl)
{ 
        setStyleSheet(
          QString("QLineEdit {border: 2px solid gray;border-radius: 5px;padding: 0 8px;background: yellow;selection-background-color: darkgray;max-width: 120px;}")+
                           QString("QComboBox{max-width: 120px}")+

            QString("QListView {alternate-background-color: yellow;background-color:rgb(85,123,205)}")+

            QString("QPushButton{background-color:rgb(85,123,205);}")+

            //QString("QLabel{background-color:rgb(85,123,205)}")+

                //QString("QFrame, QLabel, QToolTip {border: 2px solid green;border-radius: 4px;padding: 2px;background-image: url(images/welcome.png);}")+

                QString(""));//设置各部件样式

        nodeListLabel=new QLabel(tr("节点选择"));

        sensorListLabel=new QLabel(tr("传感器选择"));

        nodeComboBox=new QComboBox;

        sensorComboBox=new QComboBox;

        tempeLabel=new QLabel(tr("温度"));

        tempeUpLabel=new QLabel(tr("温度上限"));

        tempeDownLabel=new QLabel(tr("温度下限"));  
           。。。。

	tempeLEdit=new QLineEdit;

	tempeUpLEdit=new QLineEdit;

	tempeDownLEdit=new QLineEdit;
        。。。。//省去了定义部分

	;

    //QSplitter *splitter = new QSplitter( Qt::Vertical, 0);

	QHBoxLayout *hLayout=new QHBoxLayout;

	QGridLayout *gridLayout=new QGridLayout;

	//splitter->addWidget(hLayout);

	//splitter->setLayout(gridLayout);

	//addWidget(QWidget*,int row,int column,int rowStretch,int columnStretch,Qt::Alignment),
        //row表示行，column表示列，rowStretch表示行方向占据的宽度，columnStretch表示列方向占的宽度，Qt::Alignment表示对齐方式，默认为0

    gridLayout->addWidget(nodeListLabel,0,0,1,1);

    gridLayout->addWidget(nodeComboBox,0,1,1,1);

    gridLayout->addWidget(sensorListLabel,0,2,1,1);

    gridLayout->addWidget(sensorComboBox,0,3,1,1);

    //gridLayout->addLayout(hLayout,0,0,1,4);

	gridLayout->addWidget(tempeLabel,1,0,1,1);

	gridLayout->addWidget(tempeLEdit,1,1,1,1);

	gridLayout->addWidget(tempeUpLabel,1,2,1,1);

	gridLayout->addWidget(tempeUpLEdit,1,3,1,1);

	gridLayout->addWidget(tempeDownLabel,1,4,1,1);

	gridLayout->addWidget(tempeDownLEdit,1,5,1,1);

    gridLayout->addWidget(dynamic_cast<QWidget*>(new QSpacerItem(50,50)),1,6,1,3);//添加一个空白项，使布局显示更合理，可根据具体情况灵活应用
//上面的一行是我一分钟前写的，现在它只能作为一种尝试了，dynamic_cast用法，引申继续学习C++基础，O(∩_∩)O~，这样可以编译通过，但是效果没看到

	gridLayout->addWidget(humiditLabel,2,0,1,1);

	gridLayout->addWidget(humidityLEdit,2,1,1,1);

	gridLayout->addWidget(humiditUpLabel,2,2,1,1);

	gridLayout->addWidget(humidityUpLEdit,2,3,1,1);

	gridLayout->addWidget(humiditDownLabel,2,4,1,1);

	gridLayout->addWidget(humidityDownLEdit,2,5,1,1);

	gridLayout->addWidget(lightLabel,3,0,1,1);

	gridLayout->addWidget(lightLEdit,3,1,1,1);

	gridLayout->addWidget(lightUpLabel,3,2,1,1);

	gridLayout->addWidget(lightUpLEdit,3,3,1,1);

	gridLayout->addWidget(lightDownLabel,3,4,1,1);

	gridLayout->addWidget(lightDownLEdit,3,5,1,1);

	gridLayout->addWidget(radioLabel,4,0,1,1);

	gridLayout->addWidget(radioLEdit,4,1,1,1);

	gridLayout->addWidget(radioUpLabel,4,2,1,1);

	gridLayout->addWidget(radioUpLEdit,4,3,1,1);

	gridLayout->addWidget(radioDownLabel,4,4,1,1);

	gridLayout->addWidget(radioDownLEdit,4,5,1,1);

	gridLayout->addWidget(co2Label,5,0,1,1);

	gridLayout->addWidget(co2LEdit,5,1,1,1);

	gridLayout->addWidget(co2UpLabel,5,2,1,1);

	gridLayout->addWidget(co2UpLEdit,5,3,1,1);

	gridLayout->addWidget(co2DownLabel,5,4,1,1);

	gridLayout->addWidget(co2DownLEdit,5,5,1,1);

	//gridLayout->addWidget(closeButton,2,1,1,1);

    gridLayout->setContentsMargins(50,50,50,50);//设置布局内部四边的空隙

	gridLayout->setAlignment(Qt::AlignHCenter);

    gridLayout->setAlignment(Qt::AlignVCenter);

    gridLayout->setColumnStretch(6,1);//设置列宽度，这里就实现了添加空白项的，自动调整居中效果，在第一列也可以设置同样的效果，看起来非常舒服

    //gridLayout->setColumnStretch(0,3);

	//gridLayout->setMargin(5);	

	gridLayout->setSpacing(25);//设置间距

	this->setLayout(gridLayout);

效果图：