[Interest] DelegateModel: Dynamic Delegate Model groups

[Jérôme Godbout]

Just to make sure the concat really generate the JS array, try the
following (It should not give any difference, but just to make sure):

function adaptQList(src)
{
var rv = [];
for(var i = 0; i < src.length; ++i)
rv.push(src[i]);
return rv;
}

But I suspect you have a type mismatch here, since you have a
QList<QObject*> and a QQmlLisProperty<QQmlDelegateModelGroup>, try with a
property of type QQmlLisProperty<QObject> and affect the value to see if
this work (it should). If this work you will need to convert type of have a
setter that take QQmlLisProperty<QObject> and do the C++ type
check/conversion to your strongly typed QQmlDelegateModelGroup.

Jerome


On Tue, Jul 26, 2016 at 1:33 PM, Jason H <jhihn at gmx.com> wrote:

>
> Thanks for the pointer, but when I hacked it in as a p.o.c:
>
> groups = [].concat(recipientModelGroups); //Error: Cannot assign QList<QObject*> to QQmlListProperty<QQmlDelegateModelGroup>
>
> (groups is a DelegateModel.group property, recipentModelGroups is a js
> array of DelegateModelGroups). I think I'm trying to go the other way? Or
> the QQmlListProperty<QQmlDelegateModelGroup> is too tightly typed?
>
>
> *Sent:* Tuesday, July 26, 2016 at 11:49 AM
> *From:* "Jérôme Godbout" <jerome at bodycad.com>
> *To:* "Jason H" <jhihn at gmx.com>
> *Cc:* "André Somers" <andre at familiesomers.nl>, "Interests Qt" <
> interest at qt-project.org>
> *Subject:* Re: [Interest] DelegateModel: Dynamic Delegate Model groups
> QQmlListProperty<> cannot be assign with another QQmlListProperty<> or a
> QList<>, but it does support javascript Array. I myself made a simple
> function to convert:
>
> function adaptQQLP(list_obj)
> {
>    return [].concat(list_obj);
> }
> It does iterate on it and create a javascript array which is enough
>
> MyQmlObj
> {
>    myQQmlListProperty: adaptQQLP(myOtherId_.itsOwnQQmlListProperty)
> }
>
> This is a workaround the QQmlListProperty madness. This and the clear and
> push everything back for any modification where performance goes down the
> toilette. Tumb rules avoid those QQmlListProperty as much as possible
> your software performance will thank you.
>
> Jerome
>
> On Tue, Jul 26, 2016 at 11:23 AM, Jason H <jhihn at gmx.com> wrote:
>>
>> > I'd just write my proxy model in C++ and be done with it.
>> >
>> > André
>> >
>> >
>> > Op 26/07/2016 om 15:46 schreef Jason H:
>> > > I want to have groups corresponding to the equivalent of 'SELECT
>> DISTINCT x' query. Then I want each item assigned to a group of it's value
>> of x. For example:
>> > > 'SELECT DISTINCT x' -> ['a', 'b', 'c']
>> > > 'SELECT x,y' -> [ ['a', '1'], ['a','2'], ['b','3'], ['c', '4'],
>> ['c','11'] ]
>> > >
>> > > Then I have 3 groups: a has 2, b has 1, c as 2, then I want to set
>> filerOnGroup to one of the groups. Is there a way to do this?
>>
>> DelegateModel.groups is a list<DelegateModelGroup>, but there seems to be
>> no way to add a group to it.
>> The DelegateModel.groups property resolves (in QtCreator) to an instance
>> of a DelegateModelGroup (having .addGroup()) which applies to adding groups
>> to *model items* and not groups it self.
>>
>> When I console.log groups, I get:
>> {"0":{"objectName":"","count":8,"name":"items","includeByDefault":true},"1":{"objectName":"","count":0,"name":"persistedItems","includeByDefault":false}}
>>
>> So I try:
>>   var recipientGroup =
>> recipientComponent.createObject(recipientComponent, {includeByDefault:
>> false, name: number}) // (works)
>>   groups[groups.length] = recipientGroup; but it doesn't take.
>> Of I try to assign them all at once: groups = recipientModelGroups;
>> I get: Error: Cannot assign QList<QObject*> to
>> QQmlListProperty<QQmlDelegateModelGroup>
>> _______________________________________________
>> Interest mailing list
>> Interest at qt-project.org
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>>
>
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