A version of QLineEdit that better handles the 'clear' action.

The Qt QLineEdit can have a 'clear' button in the text field. This is enabled with this function :

    QLineEdit::setClearButtonEnabled(bool enable)

Clicking on this button clears the text field. However, it doesn't emit any signal. You must programatically check the text field. :^(

QClearLineEdit is an extension of QLineEdit. It adds a way for the 'clear' button to emit the 'returnPressed' signal.

    // Create the LineEdit
    QClearLineEdit* lineEdit = new QClearLineEdit(parent);

    // Enable the new signal
    lineEdit->enableReturnPressedOnClear();

    // Connect the signal to our method
    QObject::connect(lineEdit, &QLineEdit::returnPressed,     this, MyClass::handleReturnPressed);

Copy QClearLineEdit.h and QClearLineEdit.cpp to your project. Where ever you use QLineEdit, you can use QClearLineEdit. Enable the new signal by calling:

    lineEdit->enableReturnPressedOnClear();

QClearLineEdit can be used in 'Designer' by promoting 'QClearLineEdit' from 'QLineEdit'.