IP configuration window QT5

I need a window (QWidget) to configure the IPv4 address. The window must be based on QWidget, it is not possible to use QtQuick. Data to enter in the window: ip address, mask, gateway, DNS, mac address, DHCP checkbox There are buttons on the window: "Save" , "Cancel". It is necessary to validate the entered data. After confirming with the "Save" button the relevant data is saved to the file /etc/network/interfaces (in accordance with the generally known standard). There is no need to parse the file and change its corresponding fragments. It is allowed to save the entire file. The window must work on a device that has a 7-inch screen with 1024x600 resolution and a touch panel (without a keyboard). The project therefore requires the use an on-screen keyboard, e.g. [login to view URL] or any other. The on-screen keyboard does not have to appear automatically when you enter to QLineEdit. It is preferred to build an auxiliary widget consisting of QLineEdit + small QPushButton "Edit". A separate widget will be created for each edited value in the window. After pressing "edit" a another window appears containing the edit field, the "confirm" button and the on-screen keyboard. After approving the data will be sent to the higher layer. Of course, better ideas are welcome.