背景我用QLineEdit和几个QPushButtons制作了一个自定义小部件，以将其与自定义项目委托(delegate)一起使用:classLineEditor:publicQWidget{public:explicitLineEditor(QWidget*parent=0):QWidget(parent){setLayout(newQHBoxLayout);layout()->setContentsMargins(0,0,0,0);layout()->setSpacing(0);QLineEdit*edit=newQLineEdit(this);layout()->addWidge