[Interest] Loader refresh

md at rpzdesign.com md at rpzdesign.com
Mon Sep 14 17:02:28 CEST 2015


Thanks for the response.

The only other areas that I can see needing a screen refresh are 
ListView and Image (Imageprovider)

The Text QML object was shared as one example of "changing" after the 
loader is when you swap out the language from English to Chinese to Arabic.

I think this is where we mis-understand each other.  What are my 
Post-Loader options, not pre-loader.

The only way I can see now to "reload" using loader, but it is not very 

And the component cache will suppress the repeated loading of the same 
QmlComponent object after 1 refresh.

So then you are really forced to make the QML stack see a new
Component so the loading is forced to take.  And that heavy handed 
requirement causes quite a lot of screen flicker.

So I would chalk this up to the inability right now to force the QML 
engine to Repaint itself.

Yes, I know, the rebuilding the Scene graph would be expensive, but that 
is what I would like to do in a generic way instead of having to set the 
text individually for each component (Since each one loads itself based 
on Country Language)

Kind of a catch-22 for text objects based on displayed language.

Maybe Microsoft flickers when it changes its display language, so I will 
just do the same.



On 9/14/2015 1:11 AM, Bo Thorsen wrote:
> Hi md,
> I don't know what it is you see, you just say it flickers. We use a lot
> of Loader objects for customer code, and that doesn't flicker.
> The only guess I have on how this could happen is if you have lots of
> bindings that keep propagating through the system.
> For example, you mentioned a Text object that switches from one string
> to another. This is an indication that your code is the reason for those
> problems. When you activate the loader, set the proper text immediately,
> don't switch it later.
> Anything like what you're trying to do below is an attempt to solve the
> symptom rather than the problem.
> Den 11-09-2015 kl. 20:37 skrev md at rpzdesign.com:
>> Someone must have come across this problem before.
>> Loader->sourceComponent is too heavy and causes screen flicker.
>> QMetaObject::invokeMethod(gobj,"doLayout",Qt::QueuedConnection) does not
>> work on QQuickText class objects.
> Bo Thorsen,
> Director, Viking Software.

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