Chapter 9: The User Interface Layer

The UI layer is a crucial component of our GUI system as it is responsible for managing and rendering all UI elements. In our Layer struct, we have two types of UI elements: Button and Checkbox. These two elements are stored in Vecs which will allow us to manage any number of these elements.

We provide methods for adding new elements (add_button, add_checkbox), rendering elements (render), and handling mouse click events (handle_mouse_click).

In the render method, we loop over all buttons and call their render method. Later, we could extend this to render other types of UI elements as well.

The handle_mouse_click method, given a mouse click's x and y coordinates, checks if any button or checkbox was clicked, and if so, triggers the associated actions.