package tomo import "errors" var backend Backend // Run initializes a backend, calls the callback function, and begins the event // loop in that order. This function does not return until Stop() is called, or // the backend experiences a fatal error. func Run (callback func ()) (err error) { backend, err = instantiateBackend() if callback != nil { callback() } err = backend.Run() backend = nil return } // Stop gracefully stops the event loop and shuts the backend down. Call this // before closing your application. func Stop () { if backend != nil { backend.Stop() } } // Do executes the specified callback within the main thread as soon as // possible. This function can be safely called from other threads. func Do (callback func ()) { backend.Do(callback) } // NewWindow creates a new window using the current backend, and returns it as a // Window. If the window could not be created, an error is returned explaining // why. If this function is called without a running backend, an error is // returned as well. func NewWindow (width, height int) (window Window, err error) { if backend == nil { err = errors.New("no backend is running.") return } window, err = backend.NewWindow(width, height) return }