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mainLayout=newQVBoxLayout(this);

mainLayout->setMargin(30);  //表示控件与窗体的左右边距

mainLayout->setSpacing(40); //表示各个控件之间的上下间距

setBackgroundRole(QPalette::Dark);	setAutoFillBackground(true);	QTextEdit *pedit1 = new QTextEdit;	QTextEdit *pedit2 = new QTextEdit;	QTextEdit *pedit3 = new QTextEdit;	QTextEdit *pedit4 = new QTextEdit;	QGridLayout *playout = new QGridLayout;	playout->addWidget(pedit1,0,0);	playout->addWidget(pedit2,0,1);	playout->addWidget(pedit3,1,0);	playout->addWidget(pedit4,1,1);	playout->setMargin(50);  	playout->setSpacing(500);  	this->setLayout(playout);