[Interest] Clean way to define and categorize constants in QML

[Jérôme Godbout]

   1. You can do an Item as root object to put children. Annoying because
   it get a lot of unused properties.
   2. Or you can do your own QtObjectWithChildren from C++, which is just a
   QObject with children default property list of QObject*. (We did this and
   call them QmlObject)
   3. Or use a javascript map, annoying to emit changed() when modifying a
   single value inside the map.

ex 2 implemented:
QmlObject
{
  readonly property alias myCategory: myCategory_

  QmlObject
  {
     id: myCategory_
     readonly property color red: "#FF00000"
  }
}

On Fri, Apr 29, 2016 at 2:12 PM, Viktória Nemkin <viktoria.nemkin at gmail.com>
wrote:

> Thank you for your help. The syntax for creating a named object property
> is what I needed.
>
> Regards,
> Viki
>
> On 29 April 2016 at 13:12, Kristoffersen, Even (NO14) <
> Even.Kristoffersen at honeywell.com> wrote:
>
>> Those internal elements are not directly accessible.
>>
>> You can try exposing them with the use of *alias* in the root object.
>>
>>
>>
>>
>>
>> -Even
>>
>>
>>
>> *From:* Interest [mailto:interest-bounces+even.kristoffersen=
>> honeywell.com at qt-project.org] *On Behalf Of *Viktória Nemkin
>> *Sent:* 29. april 2016 13:04
>> *To:* interest at qt-project.org
>> *Subject:* [Interest] Clean way to define and categorize constants in QML
>>
>>
>>
>> Hello!
>>
>>
>>
>> What is a clean way to define and categorize constants in QML?
>>
>>
>>
>> I have came up with this so far:
>>
>>
>>
>> I have a QML singleton element, named Theme. There I keep a few constant
>> things, like different background and font colors.
>>
>>
>>
>> Theme.qml:
>>
>> pragma Singleton
>>
>> import QtQuick 2.0
>>
>> QtObject {
>>
>>     readonly property color backgroundRed: "#FF2510"
>>
>>     readonly property color backgroundWhite: "#F0F0F0"
>>
>>     readonly property color backgroundPurple: "#930083"
>>
>>     readonly property color fontRed: "#FF1010"
>>
>>     readonly property color fontWhite: "#F6F6F6"
>>
>> }
>>
>>
>>
>> When I want to use one of the colors I write:
>>
>>
>>
>> color: Theme.backgroundRed
>>
>>
>>
>> I don't like this approach. What I would like to be able to write is this:
>>
>>
>>
>> color: Theme.background.red
>>
>>
>>
>> I have tried adding nested QtObjects inside Theme but I could not get it
>> working.
>>
>>
>>
>> QtObject {
>>
>>     QtObject {
>>
>>         id: *background*
>>
>>         readonly property color red: "#FF2510"
>>
>>         readonly property color white: "#F0F0F0"
>>
>>         readonly property color purple: "#930083"
>>
>>     }
>>
>>
>>
>>     QtObject {
>>
>>         id: *font*
>>
>>         readonly property color red: "#FF1010"
>>
>>         readonly property color white: "#F6F6F6"
>>
>>     }
>>
>> }
>>
>>
>>
>> When I run it like this, I get an error: Theme.qml: Cannot assign to
>> non-existent default property.
>>
>> Is there a way to accomplish this? Is there any clean way to define and
>> categorize constants in QML?
>>
>> Thank you,
>> Viki
>>
>
>
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