Re: [Interest] DelegateModel: Dynamic Delegate Model groups

[Jason H]

Oh, I may see the problem, I created the objects as:

Component {
	id: recipientComponent
	DelegateModelGroup {}	
}

var recipientGroup = recipientComponent.createObject(recipientComponent, {includeByDefault: false, name: number});

I don't know how I can more strongly type that. I'd expect Qt to internally try to promote it and succeed.


Sent: Tuesday, July 26, 2016 at 1:43 PM
From: "Jérôme Godbout" <jer...@bodycad.com>
To: "Jason H" <jh...@gmx.com>
Cc: "André Somers" <an...@familiesomers.nl>, "Interests Qt" <interest@qt-project.org>
Subject: Re: [Interest] DelegateModel: Dynamic Delegate Model groups



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 <jh...@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" <jer...@bodycad.com>
To: "Jason H" <jh...@gmx.com>
Cc: "André Somers" <an...@familiesomers.nl>, "Interests Qt" <interest@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 <jh...@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>

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