Qt窗口分割使用QSplitter，QSplitter继承自QFrame，QFrame又继承自QWidget。

QSplitter拆分窗口：

• 不同QSplitter对象通过指定父子关系来完成嵌套（和布局QLayout一样）
• QSplitter可以放置到指定的任何窗口内

1、代码一：把一个窗口分为左右两列

#include "dialog.h"
#include <QTextEdit>
#include <QSplitter>

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    //Qt::Horizontal：水平分割窗口
    //Qt::Vertical：垂直分割窗口
    QSplitter *Splitter = new QSplitter(Qt::Horizontal,this);
    //QSplitter *Splitter = new QSplitter(Qt::Vertical,this);
    //指定QTextEdit显示在QSplitter后，后面的添加QTextEdit部件到QSplitter分割窗口的代码可以注释掉
    QTextEdit *LEdt = new QTextEdit(tr("左窗口"),Splitter);
    QTextEdit *REdt = new QTextEdit(tr("右窗口"),Splitter);

    //Splitter->addWidget(LEdt);
    //Splitter->addWidget(REdt);

    //设置分割窗口的宽度比例为1:2
    Splitter->setStretchFactor(0,1);
    Splitter->setStretchFactor(1,2);

    Splitter->show();
}

Dialog::~Dialog()
{
}

2、把一个窗口拆分为左右两列，右列再拆分为上下两列

#include "dialog.h"
#include <QTextEdit>
#include <QSplitter>

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    //Qt::Horizontal：水平分割窗口
    //Qt::Vertical：垂直分割窗口
    //窗口分割，存在先后顺序，左窗口完成后，再右窗口
    QSplitter *Lsplitter = new QSplitter(Qt::Horizontal,this);
    //QSplitter *Rsplitter = new QSplitter(Qt::Vertical,Lsplitter);右窗口定义在此处，编译结果与期望结果相反
    QTextEdit *LEdt = new QTextEdit(tr("左窗口"),Lsplitter);
    QSplitter *Rsplitter = new QSplitter(Qt::Vertical,Lsplitter);
    QTextEdit *RtopEdt = new QTextEdit(tr("右上窗口"),Rsplitter);
    QTextEdit *RbtmEdt = new QTextEdit(tr("右下窗口"),Rsplitter);
    //设置右窗口的上下窗口比例1:4
    Rsplitter->setStretchFactor(0,1);
    Rsplitter->setStretchFactor(1,4);

    //设置分割窗口左右的宽度比例为1:2
    Lsplitter->setStretchFactor(0,1);
    Lsplitter->setStretchFactor(1,2);

    Lsplitter->show();
}

Dialog::~Dialog()
{
}

3、把一个窗口分为左右两列，左窗口再拆分为上下两列

代码3

#include "dialog.h"
#include <QTextEdit>
#include <QSplitter>

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    //Qt::Horizontal：水平分割窗口
    //Qt::Vertical：垂直分割窗口
    //左窗口分割
    QSplitter *Lsplitter = new QSplitter(Qt::Vertical);
    QTextEdit *LtopEdt = new QTextEdit(tr("左上窗口"),Lsplitter);
    QTextEdit *LbtmEdt = new QTextEdit(tr("左下窗口"),Lsplitter);
    //左窗口上下比例为1:2
    Lsplitter->setStretchFactor(0,1);
    Lsplitter->setStretchFactor(1,2);

    //右窗口
    QSplitter *Rsplitter = new QSplitter();
    QTextEdit *REdt = new QTextEdit(tr("右窗口"),Rsplitter);

    //整合左右窗口为一个窗口
    QSplitter *MainSplitter = new QSplitter(Qt::Horizontal,this);
    MainSplitter->addWidget(Lsplitter);
    MainSplitter->addWidget(Rsplitter);
    //设置分割窗口左右的宽度比例为4:1
    MainSplitter->setStretchFactor(0,4);
    MainSplitter->setStretchFactor(1,1);
    MainSplitter->show();
}

Dialog::~Dialog()
{
}