kotlinlang #tornadofx

private val listener = ChangeListener<Number> { _, _, nv ->
                if ( userData != null) {
                    val scrollable = userData as ScrollableItemWrapper
                    val pos = listView.height - this.height - nv.toDouble()
                    if (scrollable.lastItem && pos > 0 && (pos < this.height/4) && index+1 == maxRange*50) {
                        println("$currentRange cur.range| ${scrollable.lastItem} item| $pos pos| ${this.height} height| $index index| ${maxRange*50} max.range")
                    }
                    if ( scrollable.lastItem && pos > 0 && (pos < this.height/4) && index+1 == maxRange*50) {
                        runAsync {
                            getNextMessages()
                        } ui {
                            records.addAll( it )
                            listView.scrollTo(index+1-(listView.height/this.height).toInt())
                        }
                    }
                }
            }

final version of listener for endless scroll, without any problems 🙂

chickenfresh

08/27/2018, 3:41 PM

are objects in list sorted somehow? If I wan’t to add rows to the top (not to the bottom), how can I do that?

carlw

08/27/2018, 3:43 PM

add(0, item)

chickenfresh

08/27/2018, 3:43 PM

what would happen to the index?

chickenfresh

08/27/2018, 3:44 PM

if it was 49, then after adding new 50 objects it would be 99?

carlw

08/27/2018, 3:47 PM

i was doing scrollTo(list.size)

carlw

08/27/2018, 3:48 PM

where list.size was the pre-fetched size (ex 50). this kept the scrollTo() from interfering with the fetch mechanism

carlw

08/27/2018, 3:48 PM

(not a needed restriction if you go the drag route)

chickenfresh

08/27/2018, 3:51 PM

I don’t like

scrollTo

as it pauses scrolling, for example I’m scrolling with speed 10 rows/sec and then it drops the speed/stops

chickenfresh

08/27/2018, 3:51 PM

but I suppose there’s no way to deal with it?

chickenfresh

08/27/2018, 3:52 PM

may be its possible to prevent auto-scrolling to the very bottom when new objects added to the list?

seiv

08/27/2018, 5:41 PM

Hi, is there a simple way to get the dirty item from model, w/o commit? Like webengine.loadContent(preview(model.dirtyitem)).

bj0

08/28/2018, 12:33 AM

i don't think it exists as an item until you commit

chickenfresh

08/28/2018, 2:30 AM

@carlw made it endless in both ways

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private val listener = ChangeListener<Number> { _, _, nv ->
                if ( userData != null) {
                    curIndex = index
                    val pos = listView.height - this.height - nv.toDouble()
                    val rowsOnView = (listView.height/this.height).toInt()
                    val firstPos = (pos-this.height*rowsOnView).toInt()
                    if (index == 0 && ((firstPos > 0 && firstPos<this.height/2) || (firstPos < 0 && firstPos > -(this.height/2)))){
                        runAsync {
                            getPrevMessages()
                        } ui {
                            records.addAll(0, it)
                            listView.scrollTo(index+50)
                        }
                    } else if ( (userData as ScrollableItemWrapper).lastItem && pos > 0 && (pos < this.height/4) && index+1 == maxRange*50) {
                        runAsync {
                            getNextMessages()
                        } ui {
                            records.addAll( it )
                            listView.scrollTo(index+1-rowsOnView)
                        }
                    }
                }
            }

chickenfresh

08/28/2018, 2:33 AM

this.height

values to 60 so I’m dividing it to 2 and 4, but its about accuracy and length of list is 50, may be its better to have

private var

with size of last ‘update’, but I’m sure so left it as default value for me

chickenfresh

08/28/2018, 4:07 AM

override fun updateItem

is so buggy, I’m getting ghost objects and duplicates everywhere

chickenfresh

08/28/2018, 4:07 AM

how can I remove them?

chickenfresh

08/28/2018, 4:18 AM

override fun updateItem

returns ghost objects from nowhere if there’s not enough objects to fulfil ui, why’s that and how can be fixed? I can capture screen for details

carlw

08/28/2018, 10:19 AM

You probably are not resetting the empty ones. Ex, text=null

carlw

08/28/2018, 10:20 AM

The nodes are recycled

chickenfresh

08/28/2018, 10:40 AM

I do

chickenfresh

08/28/2018, 10:41 AM

Copy code

if( item != null && !empty ) { ... } else {
                    text = null
                    userData = null
                }

abhinay

08/28/2018, 12:25 PM

Noob Kotlin question: I am trying to extend a Java Class in Kotlin and it shows me a compilation error for

Inherited Platform declaration clash

. I am not extending an abstract class and my class doesn't override the method. Basically, its just this:

Copy code

class MyTableRowSkin<S>(val tableRow: TableRow<S>) : TableRowSkin<S>(tableRow) {

}

The compilation error is thrown for

fun createCell()

TableRowSkin

has a body for the function, which is inherited from

TableRowSkinBase

(where the method is abstract). Please note, I am using JDK 9 where

TableRowSkin

is a public API. cc @edvin

carlw

08/28/2018, 12:26 PM

@chickenfresh do you get the ghost objects if you take away the previous clause that you just added (firstPos...)

edvin

08/28/2018, 1:03 PM

@abhinay Could it be that your

tableRow

declared as a

val

in the constructor is shadowing a

getTableRow()

or a

tableRow

property in

TableRowSkin

? I don't have JDK9 installed so I can't confirm, but that's my first thought.

edvin

08/28/2018, 1:04 PM

I also don't think you wanted to declare the tableRow as a

val

, since you're passing it on to the

TableRowSkin

constructor, hence it is probably already available to you, no need to declare a new property to access it.

abhinay

08/28/2018, 1:10 PM

I just tried removing

val

. It doesn't help. I think

tableRow

is not the problem here since it doesn't complain about

getTableRow()

abhinay

08/28/2018, 1:10 PM

Here is a screenshot: