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我需要一些幫助，我需要爲我的應用程序設置佈局，但我不知道如何設置佈局上的QMainWindow上QMAIN窗口QT添加布局..使用代碼
這裏是一個部分我對於window.cpp代碼：
window::window(QWidget *parent)
: QMainWindow(parent)
{
createFilesTable();
queryopen();
exitButton = createButton("E&xit",SLOT(programout()));
insertButton = createButton("&Add", SLOT(insert()));
editButton = createButton("&Edit", SLOT(edit()));
clearButton = createButton("&Clear", SLOT(clear()));
selectButton = createButton("&Select", SLOT(select()));
QHBoxLayout *buttonsLayout = new QHBoxLayout;
buttonsLayout->addStretch();
buttonsLayout->addWidget(selectButton);
buttonsLayout->addWidget(insertButton);
buttonsLayout->addWidget(editButton);
buttonsLayout->addWidget(clearButton);
buttonsLayout->addWidget(exitButton);
txtid = new QLineEdit;
txtname = new QLineEdit;
txtdesc = new QLineEdit;
label1 = new QLabel("ID:");
label2 = new QLabel("Name:");
label3 = new QLabel("Description:");
QGridLayout *mainLayout = new QGridLayout;
mainLayout->addWidget(label1,1,0,1,1);
mainLayout->addWidget(txtid,1,1,1,2);
mainLayout->addWidget(label2,2,0,1,1);
mainLayout->addWidget(txtname,2,1,1,3);
mainLayout->addWidget(label3,3,0,1,1);
mainLayout->addWidget(txtdesc,3,1,1,3);
mainLayout->addLayout(buttonsLayout,4,1,1,3);
mainLayout->addWidget(filesTable,6,0,6,5);
setLayout(mainLayout);
setWindowTitle("Database Connection");
resize(450,300);
}