[prev in list] [next in list] [prev in thread] [next in thread] 

List:       openjdk-openjfx-dev
Subject:    Re: TableView API, no lazy retrieval of visible cell content possible?
From:       Robert_Krüger <krueger () lesspain ! de>
Date:       2015-01-29 10:11:59
Message-ID: CAEnqZEXcCqbQ9vN=r5XpL-+23o1SVjPp9q_PCq_XSZyxpOp=gQ () mail ! gmail ! com
[Download RAW message or body]

I have filed https://javafx-jira.kenai.com/browse/RT-39917 for this in Jira.

On Wed, Jan 28, 2015 at 5:57 PM, Robert Krüger <krueger@lesspain.de> wrote:

>
>
> On Wed, Jan 28, 2015 at 5:55 PM, Robert Krüger <krueger@lesspain.de>
> wrote:
>
>> OK, I investigated some more.
>>
>> What is weird is that the same table cell instance (I checked the Object
>> hashcode) is set to different model values while it is still visible, i.e.
>> I get sequences like this in the log, just when I display the table:
>>
>> Updating cell 673139775 from null with Image reference for Row 0
>> Adding Row 0 to image load queue
>> Updating cell 673139775 from Image reference for Row 0 with Image
>> reference for Row 1
>> Adding Row 1 to image load queue
>> Dequeueing image for Row 0
>> Updating cell 673139775 from Image reference for Row 1 with Image
>> reference for Row 2
>> Adding Row 2 to image load queue
>> Dequeueing image for Row 1
>> Updating cell 673139775 from Image reference for Row 2 with Image
>> reference for Row 3
>> Adding Row 3 to image load queue
>> Dequeueing image for Row 2
>> Updating cell 673139775 from Image reference for Row 3 with Image
>> reference for Row 4
>> Adding Row 4 to image load queue
>> Dequeueing image for Row 3
>> Updating cell 673139775 from Image reference for Row 4 with Image
>> reference for Row 5
>> Adding Row 5 to image load queue
>> Dequeueing image for Row 4
>> Updating cell 673139775 from Image reference for Row 5 with Image
>> reference for Row 6
>> Adding Row 6 to image load queue
>> Dequeueing image for Row 5
>>
>> This means that I cannot rely on the same table cell to be used for
>> displaying the content while its row is visible (+ a bit of buffered rows
>> around the visible area) and that means the whole approach will not work.
>>
>> It would really be great if someone from Oracle could comment here. None
>> of this behaviour is documented in the API so it seems that using this is
>> really relying on implementation details and I have found any other options
>> to achieve that. The behaviour of the application as it is
>>
>
> this should be "I have _not_ found ..."
>
>
>> now is that randomly some images are never loaded, because they are
>> quickly removed from the load queue because the cell's content is
>> overwritten while it is still being displayed.
>>
>>
>>


-- 
Robert Krüger
Managing Partner
Lesspain GmbH & Co. KG

www.lesspain-software.com
[prev in list] [next in list] [prev in thread] [next in thread]