C Qt 60 - Whats this help with installable event filters

C Qt 60 - Whats this help with installable event filters.In this C Qt Programming Videos Tutorial you can watch the C Qt Programming videos like Signals and Slots,Displaying Windows,layouts, tabs and buddies,Basic Application and HTML Aware Widgets,Horizontal and Vertical Layouts,QGridLayout,Splitters,QDir,QFile,Resource Files,QLabel and QT Designer,QPushButton,QLineEdit,QCheckBox,QThreads,Algorithms,Databases,QDirModel and QTreeView,QFileSystemModel,QItemDelegate delegates in a QTableview ...etc.