[SailfishDevel] Conditional QML element

[E.S. Rosenberg]

If anyone is curious, this is how I resolved it:
https://github.com/Keeper-of-the-Keys/gpodder-sailfish/blob/episode-art-list/qml/ArtArea.qml

Op di 7 apr. 2020 om 20:19 schreef Alexey Andreyev <
yetanotherandreyev at gmail.com>:

> Hello! I could be wrong, but I've probably faced BackgroundItem as the
> freezes reason (ListItem inherits BackgroundItem) the other day with the
> Silica's ListView.
> I could recommend to try fallback to Item and MouseArea from ListItem and
> BackgroundItem accordingly and check is that true. Just a hint from my side
> what to check twice, I would be glad to hear about the results is that the
> case.
>
> вт, 7 апр. 2020 г. в 18:52, E.S. Rosenberg <
> es.rosenberg+sailfishos.org at gmail.com>:
>
>> Hi David,
>> You are absolutely correct, this is the better solution which runs at a
>> reasonable speed (though I expect it consumes more memory).
>> Thanks!
>> Eli
>> PS - so far I have never really profiled the application for memory usage
>> or tried to do so, does the SDK have some way of doing this?
>>
>> Op di 7 apr. 2020 om 11:55 schreef David Llewellyn-Jones <
>> david at flypig.co.uk>:
>>
>>> Hi Eli,
>>>
>>> I'm probably misunderstanding the situation, but can you make individual
>>> items visible or not (visible: true/false), rather than using Loaders in
>>> the list?
>>>
>>> David
>>>
>>> On 07/04/2020 11:22, E.S. Rosenberg wrote:
>>> > Hi Andrey,
>>> > Thanks for the suggestion, though having them as Components in the same
>>> > file instead of external qml files does improve performance it is still
>>> > a lot slower then just having the component directly in use without a
>>> > Loader.
>>> >
>>> > ie:
>>> >
>>> > ListItem {
>>> >     (...)
>>> >     ArtArea {
>>> >     }
>>> > }
>>> >
>>> > Of course like that there is no logic to have either ArtArea or
>>> > CoverArea but I can have logic in each ArtArea as to which image it is
>>> > displaying so image loading an logic speed are not the issue but rather
>>> > just the loader (I can have 400+ length lists where you really see the
>>> > slowdown).
>>> >
>>> > Any other suggestions?
>>> > Thanks!
>>> > Eli
>>> >
>>> > Op di 7 apr. 2020 om 01:15 schreef Андрей Кожевников
>>> > <coderusinbox at gmail.com <mailto:coderusinbox at gmail.com>>:
>>> >
>>> >     wrap inside Component and set using sourceComponent property
>>> >
>>> >     вт, 7 апр. 2020 г. в 01:13, E.S. Rosenberg
>>> >     <es.rosenberg+sailfishos.org at gmail.com
>>> >     <mailto:es.rosenberg%2Bsailfishos.org at gmail.com>>:
>>> >
>>> >         Hi all,
>>> >         In the application I maintain (gPodder) I would like to show an
>>> >         element holding Image(s) in each ListItem, depending on whether
>>> >         or not the ListItem has a property either a component with 2
>>> >         images or a component with 1 image should be loaded (an
>>> possibly
>>> >         also a no image fallback).
>>> >
>>> >         I have tried implementing this using a Loader:
>>> >             Loader {
>>> >                 id: artArea
>>> >                 anchors {
>>> >                     left: parent.left
>>> >                 }
>>> >                 height: titleItem.height + subtitleItem.height
>>> >                 width: titleItem.height + subtitleItem.height
>>> >
>>> >                 asynchronous: true
>>> >                 source: episode_art ? "ArtArea.qml" : "CoverArea.qml"
>>> >             }
>>> >
>>> >         However this totally tanks performance, using just "ArtArea"
>>> >         without the loader is really fast thus the issue is not the
>>> >         amount of images that need to be loaded.
>>> >         Is there a better/faster way to do this?
>>> >
>>> >         Thanks!
>>> >         Eli
>>> >         _______________________________________________
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>>>
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