QShortcut - how to correcly declare in widget?

Question

i am trying to use QShortcut, and declare in in widget constructor like:

   QShortcut  *keyCtrlL;
    keyCtrlL = new QShortcut(this);
    keyCtrlL->setKey(Qt::CTRL + Qt::Key_L);
    connect(keyCtrlL, &QShortcut::activated, this, &MyPage::loadB);

I am not sure it will work, even it compile fine, as variable is local in the constructor. So i am trying to declare it as a private variable for the whole class MyPage,

and getting compilation errors:

error: cannot initialize a parameter of type 'QWidget *' with an rvalue of type 'MyPage *'
    ui->setupUi(this);
                ^~~~
./qt/forms/ui_mypage.h:69:27: note: passing argument to parameter 'MyPage' here
    void setupUi(QWidget *MyPage)
                          ^
qt/mypage.cpp:153:20: error: no matching constructor for initialization of 'QShortcut'
    keyCtrlL = new QShortcut(this);

Even MyPage is inherited from QWidget. Why this error happens, how can i fix it?

Answer 1

You may be missing #include of MyPage header... Without it, it cannot upcast MyPage* to QWidget*. Check if it is not missing.