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// 创建菜单1QMenu *fileMenu = new QMenu(tr("&File"),this);
QAction *newAction = new QAction(tr("&New"),this);
fileMenu->addAction(newAction);
QMenuBar *menuBar = new QMenuBar(this);
menuBar->addMenu(fileMenu);
connect(newAction,SIGNAL(triggered()),this,SLOT(fileNew()));为什么创建出来的菜单那么丑？菜单栏 file 右边有一块空白区域，上面没有任何显示。QMenu *fileMenu = new QMenu(tr("&File"),this);
QMenu *editMenu = new QMenu(tr("&Edit"),this);
QAction *newAction = new QAction(tr("&New"),this);
QAction *copyAction = new QAction(tr("&Copy"),this);
fileMenu->addAction(newAction);
editMenu->addAction(copyAction);
QMenuBar *menuBar = new QMenuBar(this);
menuBar->addMenu(fileMenu);
menuBar->addMenu(editMenu);
connect(newAction,SIGNAL(triggered()),this,SLOT(fileNew()));
connect(copyAction,SIGNAL(triggered()),this,SLOT(editCopy()));增加一项 Edit 菜单后，创建的菜单栏与1的宽度是相同的，Edit 菜单项正好占用了1中的空白区域。QMenu *fileMenu = new QMenu(tr("&File"),this);
QMenu *editMenu = new QMenu(tr("&Edit"),this);
QMenu *helpMenu = new QMenu(tr("&Help"),this);
QAction *newAction = new QAction(tr("&New"),this);
QAction *copyAction = new QAction(tr("&Copy"),this);
QAction *aboutAction = new QAction(tr("&About"),this);
fileMenu->addAction(newAction);
editMenu->addAction(copyAction);
helpMenu->addAction(aboutAction);
QMenuBar *menuBar = new QMenuBar(this);
menuBar->addMenu(fileMenu);
menuBar->addMenu(editMenu);
menuBar->addMenu(helpMenu);
connect(newAction,SIGNAL(triggered()),this,SLOT(fileNew()));
connect(copyAction,SIGNAL(triggered()),this,SLOT(editCopy()));
connect(aboutAction,SIGNAL(triggered()),this,SLOT(helpAbout()));再增加一个 Help 菜单时，发现显示与1相似，菜单项有一空白、只是多了一个指示，类似于 >>; 点击后才显示出 Edit 和 Help。怎么才能设定菜单栏的宽度，以避免出现1和3的问题？
继续学习中，希望可以解决上述问题。
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原文地址：http://blog.csdn.net/91program/article/details/50651494
