GUI on 7" touchscreen display

[gh0151]

Hello, I'm a beginner. I'm thinking of buying a LANDZO 7" touchscreen display that has HDMI connectivity. I want to build a GUI and read user input. All the tutorials I've seen include GPIO but in my case I won't be using that since its HDMI connectivity?

Am I able to create a GUI using this display?
If so, how do I read user input? Lets say for example, the user has a slide bar to increase light intensity, and uses the touchscreen, I want to read that user value.
(Any library will do, if it works)

Thanks in advance.

[jamesh]

What displays on the screen is independent of the screen itself. So you can display whatever you want via HDMI.

The touchscreen is a bit more complicated. You'll need the driver for the particular display - how is the touchscreen connected to the Pi? (Not via HDMI, it doesn't do that sort of thing)