I want to implement a dragdrop function in my Qt App,
but I have no idea usually in Qt how I should start.

e.g. in the visual studio, I can drag one element with its content to the editor window:

1.png

then i can drop this element there:

2.png

I want my Qt App can be like the editor window, which reacts when an element comes to its area.
how i should start with Qt?