QT 利用QSplitter 分割区域， 并添加QScrollArea 滚动区域，滚动条

1. QSplitter 分割区域， 可以分割区域中可以随意添加自己的布局

2.

#include "dialog.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //Dialog w;
    //w.show();

    QTextEdit *editor1 = new QTextEdit("test1");
    QTextEdit *editor2 = new QTextEdit("test2");
    QTextEdit *editor3 = new QTextEdit("test3");

    QSplitter *splitter = new QSplitter(Qt::Vertical);
    splitter->addWidget(editor1);
    splitter->addWidget(editor2);

    QSplitter mainsp(Qt::Horizontal);
    mainsp.addWidget(editor3);
    mainsp.addWidget(splitter);

    mainsp.show();
    
    return a.exec();
}

3.  添加滚动条

#include "dialog.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //Dialog w;
    //w.show();

    QTextEdit *editor1 = new QTextEdit("test1");
    QTextEdit *editor2 = new QTextEdit("test2");
    QTextEdit *editor3 = new QTextEdit("test3");

    QSplitter *splitter = new QSplitter(Qt::Vertical);
    splitter->addWidget(editor1);
    splitter->addWidget(editor2);

    QSplitter *mainsp = new QSplitter(Qt::Horizontal);
    mainsp->addWidget(editor3);
    mainsp->addWidget(splitter);

    QScrollArea scrollArea;
    scrollArea.setWidget(mainsp);
    scrollArea.viewport()->setBackgroundRole(QPalette::Dark);
    scrollArea.viewport()->setAutoFillBackground(true);
    scrollArea.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);  //控件大小 小于 视窗大小时，默认不会显示滚动条
    scrollArea.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);    //强制显示滚动条。
    scrollArea.show();
    
    return a.exec();
}