[Qt-qml] Image { pixmap } is gone :( Can't use QIcons anymore

[Stephen Kelly]

On Fri, Jul 23, 2010 at 4:48 AM,  <bea.lam at nokia.com> wrote:
> Hi Steve,
>
> On 22/07/2010, at 1:03 AM, ext Stephen Kelly wrote:
>
>> Hello,
>>
>> The pixmap property has been removed.
>>
>> http://bugreports.qt.nokia.com/browse/QTBUG-11980
>>
>> This came as a great surprise to us because we are using it and it is
>> already very late in the release cycle to be removing things like that. The
>> replacement
>>
>> http://doc.trolltech.com/main-snapshot/qdeclarativeimageprovider.html
>>
>> Does not satisfy our usecase because it assumes that all you have in qml is
>> a name of a pixmap you want, not the actual image.
>
>
> How does your model assign the QIcon for each pixmap? If it is loaded from a file name, or has some other identifying name, you can add a new role for the model (e.g. "imageSource") and then assign this name as a value, with a prefix as necessary according to your custom image provider's name (e.g. "image://myimageprovider/the_icon_name"). Add the new role using QAbstractItemModel::setRoleNames(), and then in your QML you can replace

Yes, we identified this as a workaround too. I will likely add a
DecorationNameRole returning "the_icon_name" so that I don't have qml
urls in non-qml code and then use source : "pixmap://kicon/" +
model.decorationName.

The documentation will need to be updated too at least.

http://doc.trolltech.com/main-snapshot/qdeclarativemodels.html#qabstractitemmodel

says that model.decoration can be used for the decoration. However,
models should return a QIcon QPixmap or QBrush for the decoration
role.

http://doc.trolltech.com/latest/qt.html#ItemDataRole-enum

Also, please send an email to this list about the coming of API
removals or changes after some point in the release cycle (after the
first beta, second beta - whatever). Having advanced notice of this
stuff would make it far less surprising and annoying when I git pull
and the app does not start anymore.


Thanks,

Steve.



>
>>      Image {
>>          id: collectionIcon
>>          pixmap: KDE.iconToPixmap( model.decoration, height );
>>          width: 48; height: 48
>>      }
>
> with
>
> Image {
>        ...
>        source: imageSource
> }
>
>
> The relevant part of the imageSource string (e.g. "my_icon_name") will be passed to your QDeclarativeImageProvider::requestPixmap() method as the "id" string, so the requestPixmap() implementation can create a QIcon and return a pixmap using KDE.iconToPixmap() as before (or perhaps just load the pixmap without QIcon).
>
> The provider can be registered with the QML engine that provides your view e.g. if using QDeclarativeView:
>
>        view.engine()->addImageProvider("myimageprovider", new KDEIntegrationImageProvider);
>
>
> regards,
>
> Bea
>
>