I am using a BeagleBone Black, yocto poky, EGLFS and Qt 5.6. If I want to have a login/lock screen for my application, is the only way to do this is to code it into the application? If I read this link correctly, there is only one window. Would one use a StackView for this?
It depends whether you have a window manager or not for your device. If not then yes, you can use a stack for that kind of interaction.