Android Question Lock xCLV

[KZero]

Hi,

is it possible to make xCLV draw items offscreen and disable visibleRangeChange event while adding many items?

such as BeginUpdate , EndUpdate or Lock and Unlock in other languages

 

[DonManfred]

You know when your app is in the Phase of "BeginUpdate" or "EndUpdate".
You should ignore this Event after BeginUpdate and react on the Event again after EndUpdate.

 

[KZero]

i tried to make that

LockCLV=True
Add50ItemToList
LockCLV=False

Sub CLV_VisibleRangeChanged (FirstIndex As Int, LastIndex As Int)
if LockCLV=True then return

but CLV_VisibleRangeChanged event fired after I finish adding items

it fires many times for each visible item

CLV_VisibleRangeChanged(0,1)
CLV_VisibleRangeChanged(0,2)
CLV_VisibleRangeChanged(0,3)
CLV_VisibleRangeChanged(0,4)
........
CLV_VisibleRangeChanged(40,50)

the following code is working but I'm looking for the best approach

LockCLV=True
Add50ItemToList
sleep(50)
LockCLV=False

also if it was possible to disable xCLV drawing for each item and draw once after adding all items i think it will be much faster

 

[Erel]

Implement lazy loading. It will load the items very fast.

 

[KZero]

I already implemented lazy loading,

the problem is when I add many items at once the CLV_VisibleRangeChanged event fired many times (it should only fire one time when adding items complete)

i fixed it

this code removed the unnecessary CLV_VisibleRangeChanged events which happen while items being added

CLV.DisableVisibleRange=True
AddItemsToList
CLV.DisableVisibleRange=False
CLV.Refresh

customlistview.bas

Private Sub UpdateVisibleRange
    If DisableVisibleRange=True Then Return '<<<<<<<<<<<<<<<<<<<
    If MonitorVisibleRange = False Or getSize = 0 Then Return
    Dim first As Int = getFirstVisibleIndex
    Dim last As Int = getLastVisibleIndex
    If first <> mFirstVisibleIndex Or last <> mLastVisibleIndex Then
        mFirstVisibleIndex = first
        mLastVisibleIndex = last
        CallSubDelayed3(CallBack, EventName & "_VisibleRangeChanged", mFirstVisibleIndex, mLastVisibleIndex)
    End If
End Sub

 

[Erel]

Big mistake to use the class instead of the library. Other libraries will fail.

It is unneeded. Just implement this flag in your code.