rui/appWasm.go

//go:build wasm

package rui

import (
	_ "embed"
	"strings"
	"syscall/js"
)

//go:embed app_wasm.js
var wasmScripts string

type wasmApp struct {
	params            AppParams
	createContentFunc func(Session) SessionContent
	session           Session
	brige             webBrige
	close             chan DataObject
}

func (app *wasmApp) Finish() {
	app.session.close()
}

func wasmLog(text string) {
	js.Global().Call("log", text)
}

func (app *wasmApp) handleMessage(this js.Value, args []js.Value) any {
	if len(args) > 0 {
		if obj := ParseDataText(args[0].String()); obj != nil {
			switch command := obj.Tag(); command {
			/*
						case "startSession":
							answer := ""
							if session, answer = app.startSession(obj, events, brige); session != nil {
								if !brige.writeMessage(answer) {
									return
								}
								session.onStart()
								go sessionEventHandler(session, events, brige)
							}

						case "reconnect":
							if sessionText, ok := obj.PropertyValue("session"); ok {
								if sessionID, err := strconv.Atoi(sessionText); err == nil {
									if session = app.sessions[sessionID]; session != nil {
										session.setBrige(events, brige)
										answer := allocStringBuilder()
										defer freeStringBuilder(answer)

										session.writeInitScript(answer)
										if !brige.writeMessage(answer.String()) {
											return
										}
										session.onReconnect()
										go sessionEventHandler(session, events, brige)
										return
									}
									DebugLogF("Session #%d not exists", sessionID)
								} else {
									ErrorLog(`strconv.Atoi(sessionText) error: ` + err.Error())
								}
							} else {
								ErrorLog(`"session" key not found`)
							}

							answer := ""
							if session, answer = app.startSession(obj, events, brige); session != nil {
								if !brige.writeMessage(answer) {
									return
								}
								session.onStart()
								go sessionEventHandler(session, events, brige)
							}

									case "disconnect":
					session.onDisconnect()
					return

				case "session-close":
					session.onFinish()
					session.App().removeSession(session.ID())
					brige.close()

			*/
			case "answer":
				app.session.handleAnswer(obj)

			case "imageLoaded":
				app.session.imageManager().imageLoaded(obj, app.session)

			case "imageError":
				app.session.imageManager().imageLoadError(obj, app.session)

			default:
				app.session.handleEvent(command, obj)
			}
		}
	}
	return nil
}

func (app *wasmApp) removeSession(id int) {
}

func (app *wasmApp) createSession() Session {
	session := newSession(app, 0, "", ParseDataText(js.Global().Call("sessionInfo", "").String()))
	session.setBrige(app.close, app.brige)
	session.setContent(app.createContentFunc(session))
	return session
}

func (app *wasmApp) init() {

	document := js.Global().Get("document")
	body := document.Call("querySelector", "body")

	script := document.Call("createElement", "script")
	script.Set("type", "text/javascript")
	script.Set("textContent", defaultScripts+wasmScripts)
	body.Call("appendChild", script)

	js.Global().Set("sendMessage", js.FuncOf(app.handleMessage))

	app.close = make(chan DataObject)
	app.session = app.createSession()

	style := document.Call("createElement", "style")
	css := appStyles + app.session.getCurrentTheme().cssText(app.session)
	css = strings.ReplaceAll(css, `\n`, "\n")
	css = strings.ReplaceAll(css, `\t`, "\t")
	style.Set("textContent", css)
	document.Call("querySelector", "head").Call("appendChild", style)

	buffer := allocStringBuilder()
	defer freeStringBuilder(buffer)

	div := document.Call("createElement", "div")
	div.Set("className", "ruiRoot")
	div.Set("id", "ruiRootView")
	viewHTML(app.session.RootView(), buffer)
	div.Set("innerHTML", buffer.String())
	body.Call("appendChild", div)

	div = document.Call("createElement", "div")
	div.Set("className", "ruiPopupLayer")
	div.Set("id", "ruiPopupLayer")
	div.Set("onclick", "clickOutsidePopup(event)")
	div.Set("style", "visibility: hidden;")
	body.Call("appendChild", div)

	div = document.Call("createElement", "a")
	div.Set("id", "ruiDownloader")
	div.Set("download", "")
	div.Set("style", "display: none;")
	body.Call("appendChild", div)
}

// StartApp - create the new wasmApp and start it
func StartApp(addr string, createContentFunc func(Session) SessionContent, params AppParams) {
	SetDebugLog(wasmLog)
	SetErrorLog(wasmLog)

	if createContentFunc == nil {
		return
	}

	app := new(wasmApp)
	app.params = params
	app.createContentFunc = createContentFunc
	app.brige = createWasmBrige()

	app.init()
	<-app.close
}

func FinishApp() {
	//app.Finish()
}

func OpenBrowser(url string) bool {
	return false
}