Qt提供的布局类以及他们之间的继承关系（如下图）：

常用到的布局类有：QHBoxLayout、QVBoxLayout、QGridLayout三种，分别是水平排列布局、垂直排列布局、表格排列布局。

常用的方法有addWidget()和addLayout()。addWidget()用于在布局中插入控件，addLayout()用于在布局中插入子布局。

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在布局管理中还常用到setMargin()用于设定边距，setSpacing()用于设定控件间距。

setColumnStretch()用于设置列的占空比。

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示例：实现如下图的布局

basiclayout.h

#ifndef BASICLAYOUT_H#define BASICLAYOUT_H#include 
     
      class BasicLayout : public QDialog{	Q_OBJECTpublic:	BasicLayout(QWidget *parent = 0, Qt::WFlags flags = 0);	~BasicLayout();private:	QLabel *labUser;	QLabel *labName;	QLabel *labSex;	QLabel *labDepartment;	QLabel *labAge;	QLabel *labRemark;	QLineEdit *edtUser;	QLineEdit *edtName;	QComboBox *cbbSex;	QTextEdit *edtDepartment;	QLineEdit *edtAge;	QLabel *labHead;	QLabel *labIcon;	QLabel *labIndividual;	QPushButton *btnChange;	QTextEdit *edtIndividual;	QPushButton *btnOk;	QPushButton *btnCancel;};#endif // BASICLAYOUT_H
     

basiclayout.cpp

#include "basiclayout.h"BasicLayout::BasicLayout(QWidget *parent, Qt::WFlags flags)	: QDialog(parent, flags){	setWindowTitle(tr("User Infomation"));		//Left Loyout:	labUser = new QLabel(tr("User Name:"));	labName = new QLabel(tr("Name;"));	labSex = new QLabel(tr("Sex:"));	labDepartment = new QLabel(tr("Department:"));	labAge = new QLabel(tr("Age:"));	labRemark = new QLabel(tr("Remark:"));	labRemark->setFrameStyle(QFrame::Panel|QFrame::Sunken);	edtUser = new QLineEdit;	edtName = new QLineEdit;	cbbSex = new QComboBox;	cbbSex->insertItem(0,tr("Female"));	cbbSex->insertItem(1,tr("Male"));	edtDepartment = new QTextEdit;	edtAge = new QLineEdit;	QGridLayout *leftLayou = new QGridLayout;	int col_Lab = 0;	int col_Content = 1;	leftLayou->addWidget(labUser,0,col_Lab);	leftLayou->addWidget(edtUser,0,col_Content);	leftLayou->addWidget(labName,1,col_Lab);	leftLayou->addWidget(edtName,1,col_Content);	leftLayou->addWidget(labSex,2,col_Lab);	leftLayou->addWidget(cbbSex,2,col_Content);	leftLayou->addWidget(labDepartment,3,col_Lab);	leftLayou->addWidget(edtDepartment,3,col_Content);	leftLayou->addWidget(labAge,4,col_Lab);	leftLayou->addWidget(edtAge,4,col_Content);	leftLayou->addWidget(labRemark,5,col_Lab,1,2);	leftLayou->setColumnStretch(0,1);	//设置两列分别占有空间的比例	leftLayou->setColumnStretch(1,3);	//Right Layout:	labHead = new QLabel(tr("Head:"));	labIcon = new QLabel;	QPixmap m_icon("head.gif");	labIcon->resize(m_icon.width(),m_icon.height());	labIcon->setPixmap(m_icon);	btnChange = new QPushButton(tr("Change"));	QHBoxLayout *headLayout = new QHBoxLayout;	headLayout->addWidget(labHead);	headLayout->addWidget(labIcon);	headLayout->addWidget(btnChange);	headLayout->setSpacing(20);	//控件间距为20像素	labIndividual = new QLabel(tr("Individual:"));	edtIndividual = new QTextEdit;	QVBoxLayout *rightLayout = new QVBoxLayout;	rightLayout->addLayout(headLayout);	rightLayout->addWidget(labIndividual);	rightLayout->addWidget(edtIndividual);	rightLayout->setMargin(10);	//Bottom Layout:	btnOk = new QPushButton(tr("Ok"));	btnCancel = new QPushButton(tr("Cancel"));	QHBoxLayout *bottomLayout = new QHBoxLayout;	bottomLayout->addStretch();	//添加一个占位符	bottomLayout->addWidget(btnOk);	bottomLayout->addWidget(btnCancel);	bottomLayout->setSpacing(10);	//Main Layout:	QGridLayout *mainLayout = new QGridLayout(this);	mainLayout->addLayout(leftLayou,0,0);	mainLayout->addLayout(rightLayout,0,1);	mainLayout->addLayout(bottomLayout,1,0,1,2);	mainLayout->setMargin(15);	mainLayout->setSpacing(10);	mainLayout->setSizeConstraint(QLayout::SetFixedSize);	//设置对话框大小固定，不允许用户改变}BasicLayout::~BasicLayout(){}

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setFrameStyle()是QFrame的方法，参数以或的方式设定控件的风格，参数1（QFrame::Shape）用于设定控件的形状，参数2（QFrame::Shadow）用于设定控件俺的阴影。

形状有：NoFrame、Panel、Box、HLine、VLine、WinPanel 6种；阴影有：Plain、Raised、Sunken三种。

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