QT widget

#include 
#include 
#include 
#include 
#include 
#include 
#include 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    // 静态标签
    QLabel *infoLabel = new QLabel;
    QLabel *openLabel = new QLabel;
    // 编辑框
    QLineEdit* cmdLineEdit = new QLineEdit;
    // 按钮
    QPushButton* cancelButton = new QPushButton;
    QPushButton* commitButton = new QPushButton;

    // 静态标签设置文本
    infoLabel->setText("input cmd:");
    openLabel->setText("open");
    // 按钮设置文本
    cancelButton->setText("cancel");
    commitButton->setText("commit");

    // 水平布局
    QHBoxLayout *cmdLayout = new QHBoxLayout;

    // 将openLabel和cmdLineEdit添加到水平布局中
    cmdLayout->addWidget(openLabel);
    cmdLayout->addWidget(cmdLineEdit);

    // 将commitButton和cacelButton按钮也添加到水平布局中
    QHBoxLayout *buttonLayout = new QHBoxLayout;
    buttonLayout->addWidget(commitButton);
    buttonLayout->addWidget(cancelButton);

    // 垂直布局，将几个水平布局添加到垂直布局中
    QVBoxLayout *mainLayout = new QVBoxLayout;

    mainLayout->addWidget(infoLabel);
    mainLayout->addLayout(cmdLayout);
    mainLayout->addLayout(buttonLayout);


    // QWidget窗口，目前有MainWndow/QWidget/QDialog
    QWidget w;

    // 将垂直布局和QWidget窗口进行关联
    w.setLayout(mainLayout);
    w.show(); // 显示窗口
    return app.exec(); // 事件循环
}
// 编译
/**
qmake -project
qmake hello.pro
mingw32-make会报错： fatal error: QApplication: No such file or directory
需要在hello.pro最后一行加上
QT += widgets gui
再指向mingw32-make
*/

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