Can someone tell me, how to load the background of a GtkGLArea on a Cairo surface? For the gtk version 4.8.3, I did it this way–

I am trying to take a screenshot of the root window in gtk4. This is how I do it in gtk3–

I am trying to move a shape(circle) on GtkDrawingArea by scroll event(GtkEventControllerScroll). I tried the following code, but it is not working. I tried to move it only horizontally. The default horizontal position is 10, how to change value up and down by scroll event?? Can anyone check it?

I’m trying to create a Volume (Cairo circle) button in gtk4. which can be rotate by mouse motion event. By clicking anywhere on the button and rotating it, the value 1-100 will be output. Tried a lot, maybe it’s beyond my knowledge.