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tomo-old/tomo.go

42 lines
1.2 KiB
Go

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
}