How to use multi bindings in v2?

[yzqdev]

As the document says: In v1, the runtime was available via a struct passed to WailsInit(). In v2, the runtime has been moved out to its own package. Each method in the runtime takes the context.Context that is passed to the OnStartup method.

I create another binding conf.go, but the context is assigned in the app's startup method. only the app 's ctx is not null.

in v1,add many bindings with runtime are easy because there is no ctx needed. Now i wonder how to do in v2.

main.go

//go:embed frontend/dist
var assets embed.FS
func main() {
	app := NewApp()
	conf := NewConf()// the new binding
	err := wails.Run(&options.App{
		Title:            "genshin-wails",
		Width:            1024,
		Height:           768,
		Assets:           assets,
		OnStartup:        app.startup,
		Bind: []interface{}{
			app, conf,
		},
	})
	if err != nil {
		println("Error:", err)
	}
}

app.go

type App struct {
	ctx context.Context
}
func NewApp() *App {
	return &App{}
}
// startup is called when the app starts. The context is saved
// so we can call the runtime methods
func (a *App) startup(ctx context.Context) {
	a.ctx = ctx
}

conf.go

type Config struct {
	ctx context.Context
}

func NewConf() *Config {
	return &Config{}
}
//the method below can not run normally
func (c *Config) SetOutDir() string {
	c.ctx = context.Background()// this context is wrong,  it should be the same with app's ctx
	runtime.LogInfo(c.ctx, "log info")
	runtime.BrowserOpenURL(c.ctx, "e:/")
	return "success"
}

The method SetOutDir will say ctx is null or An invalid context was passed. This method requires the specific context given in the lifecycle hooks, so how to assign a context in multi binding? minimal repo https://github.com/yzqbugs/wails-qa

[leaanthony]

Good question! There are many ways (as this is just a Go question). For this scenario I would use a function in OnStartup to call methods on your structs with the context.

OnStartup: func(ctx context.context) {
  app.Init(ctx)
  config.Init(ctx)
},

[yzqdev]

Awesome! Thank you!😀

[leaanthony]

Thanks for asking. I feel this should be in the docs as an example 👍