Managing Event Focus

SDL uses windowID fields in events to track which window triggered an event. Most SDL events, like SDL_MouseButtonEvent or SDL_WindowEvent, include a windowID field that uniquely identifies the window involved.

This allows programs to distinguish events from different windows in a shared event loop.

For example, to handle a SDL_WINDOWEVENT specifically for one window:

1void HandleWindowEvent(SDL_WindowEvent& E) {
2  if (E.windowID == SDL_GetWindowID(MyWindow)) {
3    // Handle events for MyWindow
4  }
5}

The SDL_GetWindowFromID() function retrieves the SDL_Window* pointer from a windowID. This is useful for centralized event handling in applications managing multiple windows.

By mapping events to specific windows, SDL ensures precise and efficient event handling, enabling complex multi-window applications.