kotlinlang #tornadofx

its good to combine with scroll but, again, you need to prevent it fetching data when last item isn’t on screen (if you’re in the middle of the list, then you dont need to fetch anything at all)

chickenfresh

08/27/2018, 12:58 PM

Copy code

init {
        executor.scheduleAtFixedRate(executorTask, 0, AppPrefs.delay, TimeUnit.SECONDS)
    }
private val executorTask = {
        if (isActive) {
            try {
                updateChatsAndMessagesList()
            }catch(e: ConnectException){
                println(e)
            }
        }
    }

chickenfresh

08/27/2018, 12:58 PM

i have this now

chickenfresh

08/27/2018, 12:59 PM

Copy code

private fun updateChatsAndMessagesList() {
        try {
//            val chats = chatAPI.getChats()
            val updates = chatAPI.getUpdates(oldTimestamp)
//            oldTimestamp = Instant.now().toEpochMilli()
            updates.lastOrNull()?.apply {
                oldTimestamp = this.ts + 1
            }
            Platform.runLater {
                //                chatsList.setAll(chats)
//                view.showMsg(curSelectedChatId)
                removeUnsendMessages()
                for (update in updates) {
                    when (update) {
is Update.NewMessageUpdate -> {
                            val msg = MessageModel(update.msg)
                            chatsList2.find { it is ChatViewInstance.Chat && it.chat.id == msg.chat }?.run {
                                if (this is ChatViewInstance.Chat){
                                this.chat.lastSendMsg = msg
                                if (msg.user_id != getMyUserInfo().id) {
                                    this.chat.unreadCount += 1
                                }}
                            }
                            if (update.msg.chat == curSelectedChatId) {
                                chatMessagesList.add(ChatEvent.NewMessageEvent(msg))

                            }
                        }

so it automatically adds new messages when server sends them

chickenfresh

08/27/2018, 1:00 PM

(i cut off rest of function since its very long)

chickenfresh

08/27/2018, 1:03 PM

if, for example, I’m getting one

NewMessaegEvent

, MessageView is on screen and I’m already seeing last item from list, then I’d add new object to the end of the list and scroll to the bottom (as it was before update received)

chickenfresh

08/27/2018, 1:05 PM

but I need to say to `endless scroll`’s

ScrollableItemWrapper

that last item from the list is changed to the added one, and prevent it asking server for anothers

chickenfresh

08/27/2018, 1:10 PM

mainly, whole idea is about limited usage of endless scroll. If I’m not loosing connection to server and

executor

keeps list of messages up-to-date — there’s no need to have endless scroll working. only if on opening (probably, only at first time) I’d continue viewing messages from last saved position, and there are a lot more bellow and if I’m scrolling to the top for old messages

chickenfresh

08/27/2018, 1:12 PM

so many things left to implement 😞

carlw

08/27/2018, 1:18 PM

i misunderstood the problem at first. i thought you had a massive list that you needed to pull in. in that case, I recommended keying off the last item which indicated that the user had scrolled through the result set, didn't find what they were looking for, then wanted the next page of results

carlw

08/27/2018, 1:19 PM

for this, the updating is automatic.

chickenfresh

08/27/2018, 1:19 PM

I understand, I’ll use drag thing but for newsfeed 🙂

chickenfresh

08/27/2018, 1:21 PM

Are you adding it to official guide or reusing somewhere?

chickenfresh

08/27/2018, 1:21 PM

When I was on my first steps with tornado I couldn’t find any examples of this, so may be for newbies (not only) it might be a present

carlw

08/27/2018, 1:22 PM

@chickenfresh This inverts the previous example. I add to the end of the list and then scrollTo() the last added message. Press the F5 key quickly to add 20-30 items and you'll see the last on

Puts_Items_at_the_Bottom__Rests_on_Last_Item.kt

carlw

08/27/2018, 1:22 PM

i put my code samples at courses.bekwam.net

carlw

08/27/2018, 1:22 PM

i don't think they're general enough for the guide

chickenfresh

08/27/2018, 1:23 PM

If I’ve been able to start using it for my purposes with custom graphics and etc, why wouldn’t others? 🙂

carlw

08/27/2018, 1:24 PM

they would. my site is a cookbook and everyone is encouraged to check it out

chickenfresh

08/27/2018, 1:26 PM

oh ok, just haven’t seen your site before, only dozens of pages from stackoverflow, but everything I found was useless until you answered

carlw

08/27/2018, 1:26 PM

we're getting the word out in a lot of different forms. check -#-TornadoFX on twitter for resources and info too

carlw

08/27/2018, 1:27 PM

I get most of my article ideas from these slack examples. it takes time to write them up and i have a backlog

carlw

08/27/2018, 1:28 PM

and my video production has been brought to a halt by some noisy parrots 🐦

chickenfresh

08/27/2018, 1:31 PM

Haven’t used slack before, but very confident place to share ideas

carlw

08/27/2018, 1:31 PM

i like to work collaboratively. writing articles isn't as much fun

carlw

08/27/2018, 1:32 PM

(but needed)

chickenfresh

08/27/2018, 1:33 PM

When I was writing backend on python for this ChatApp, I’ve also had to design API and other stuff. Really boring, especially if you’re the only one on the project for both (frontend and backend), haha

chickenfresh

08/27/2018, 1:36 PM

how many views monthly you get on your site? Sometimes I think kotlin isn’t really popular

chickenfresh

08/27/2018, 1:36 PM

especially not for android purposes