Qt垂直/水平布局管理器（QBoxLayout，QHBoxLayout, QVBoxLayout）

 1 #include "widget.h"
 2 #include <QApplication>
 3 #include <QPushButton>
 4 #include <QHBoxLayout>
 5 #include <QVBoxLayout>
 6 
 7 int main(int argc, char *argv[])
 8 {
 9     QApplication a(argc, argv);
10     Widget w;
11     w.setWindowTitle("My App");//设置窗口标题
12 
13     //创建3个Button
14     QPushButton *button1 = new QPushButton("one");
15     QPushButton *button2 = new QPushButton("two");
16     QPushButton *button3 = new QPushButton("three");
17 
18     QHBoxLayout *hlayout = new QHBoxLayout;//创建一个水平布局管理器
19     //将button加入水平布局器
20     hlayout->addWidget(button1);
21     hlayout->addWidget(button2);
22     hlayout->addWidget(button3);
23 
24     QVBoxLayout *vlayout = new QVBoxLayout;//创建垂直布局器
25     //将button加入垂直布局器
26     vlayout->addWidget(button1);
27     vlayout->addWidget(button2);
28     vlayout->addWidget(button3);
29 
30     w.setLayout(hlayout);//将水平布局器加入主窗口
31     //w.setLayout(vlayout);//将垂直布局器加入主窗口
32 
33     w.show();
34 
35     return a.exec();
36 }