[Qt-qml] Howto disable a QML Item?

[michael.brasser at nokia.com]

Hi,

On 18/03/2011, at 7:19 PM, ext Cornelius Hald wrote:
> On Fri, 2011-03-18 at 09:42 +1000, Alan Alpert wrote:
>> Another approach that might be more general but hard to apply to your 
>> situation is to use the Connections element for the signal connections. You 
>> can set the target to null when the item is not visible, and then back to the 
>> intended target when the item is visible. This may not work for the automatic 
>> connections set up by models though.
> 
> Thanks for your answer, I'll try this as well. What I don't really like
> with most of those solutions is that I have to put in a lot of
> additional code.
> 
> Either I have do something like this is many many places:
> SomeItem {
>  text: isCurrentScreen ? backend.activePoi.name : ""
>  image: isCurrentScreen ? backend.activePoi.image : ""
> }
> 
> Or I have to create a lot of Connection elements to do the same.

Another option might be gathering all these changes up into an "inactive" State that is set when !isCurrentScreen.

> What I
> would like to have would be something like:
> 
> MyScreen {
>  active: isCurrentScreen
>  SomeItem {
>    text: backend.actitvePoi.name
>    image: backend.activePoi.image
>  }
> }

This looks like an interesting idea -- any chance you could add a suggestion at bugreports.qt.nokia.com?

Regards,
Michael

> If 'active == false' all child elements would stop reacting on property
> changes or other signals and animations would stop.
> 
> I think especially in combination with 'Qt.application.active' we need a
> way to quickly disable animations and signal handlers. But also we need
> to do this selectively.
> 
> For instance, I might want to disable visual updates on a map view, but
> still play a sound once I'm close to a certain location.
> 
> Does this make any sense? How do you solve those issues?
> 
> Thanks!
> Conny
> 
> 
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