Re: [Interest] How do i declare a QGeoCoordinate property in QML?

2016-09-26 Thread Kishore Jonnalagadda 
On Monday 26 September 2016 7:32:54 PM IST Paolo Angelelli wrote:
> Hi Kishore, have you tried "property var coordinate"?

Yes. I found mention of it in the documentation. But then i don't know how to 
create an alias to it's members.

Second, I want to initialize it to an invalid coordinate and ensure type 
safety by ensuring that it can not be assigned to anything other than a 
coordinate.

Is that possible?
--
Cheers!
Kishore

> best
> Paolo
> 
> On Mon, 26 Sep 2016 16:11:03 +0530
> 
> Kishore Jonnalagadda  wrote:
> > I have created an custom Item in which I want to have a coordinate
> > property. Further i want to create aliases to the coordinates
> > properties. How do i go about this?
> > 
> > Example:
> > 
> > /**/
> > Item {
> > 
> > id: myCustomItem
> > 
> > property coordinate coordinate
> > property alias latitude: coordinate.latitude
> > property alias longitude: coordinate.longitude
> > property alias altitude: coordinate.altitude
> > 
> > }
> > /**/
> > 
> > I have also tried the following format...
> > 
> > /**/
> > Item {
> > 
> > id: myCustomItem
> > 
> > property alias coordinate: coordinate
> > property alias latitude: coordinate.latitude
> > property alias longitude: coordinate.longitude
> > property alias altitude: coordinate.altitude
> > 
> > Coordinate {id: coordinate}
> > 
> > }
> > /**/
> > 
> > But for some reason, the second form results in a segmentation fault.


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Re: [Interest] What don't you like about Qt?

2016-09-26 Thread Jean-Michaël Celerier 
wrt FUD around licensing :

here is a recent reddit thread where someone wasn't able to see that
QtCreator was actually a free IDE :
https://www.reddit.com/r/cpp/comments/54foop/what_is_the_best_ide_for_game_development_on_mac/

> Oh, thank you! Their website was just confusing for me I couldn't figure
it out.


Best,
Jean-Michaël


On Fri, Sep 23, 2016 at 6:59 AM, Vlad Stelmahovsky <
vladstelmahov...@gmail.com> wrote:

> so the question: how to make it matter?
>
> On Thu, Sep 22, 2016 at 4:52 PM, Jason H  wrote:
>
>> I've never seen it claimed that voting matters 1 iota.
>>
>> I guess what we're asking for here is more prioritization transparency?
>>
>>
>> *Sent:* Thursday, September 22, 2016 at 2:27 AM
>> *From:* "Vlad Stelmahovsky" 
>> *To:* "Jason H" 
>> *Cc:* interest 
>>
>> *Subject:* Re: [Interest] What don't you like about Qt?
>> Actually you can vote for it and promote to other users to vote for it.
>> More votes - more chances issue to be solved
>>
>> On Wed, Sep 21, 2016 at 2:51 PM, Jason H  wrote:
>>>
>>> This gets at what I don't like about Qt the most: As a user I have no
>>> control of where it goes. I can (and do) file bugs and feature
>>> suggestions... How they get prioritized, I have no control over. Sometimes
>>> it's months, sometimes it's multiple years later, very often it's never (or
>>> more correctly, still not implemented yet). This is despite being a paying
>>> customer. Once the issue is entered, it might get tagged with the support
>>> contract level I am on, but it's effectively out of my hands.
>>>
>>>
>>>
>>> > Sent: Wednesday, September 21, 2016 at 8:35 AM
>>> > From: "Konstantin Tokarev" 
>>> > To: "Jean-Michaël Celerier" , "Jason
>>> H" 
>>> > Cc: interest , "Rob Allan" <
>>> rob_al...@trimble.com>
>>> > Subject: Re: [Interest] What don't you like about Qt?
>>> >
>>> >
>>> >
>>> > 21.09.2016, 15:28, "Jean-Michaël Celerier" <
>>> jeanmichael.celer...@gmail.com>:
>>> > > Hey, there is a lot of interesting points in all these answers; some
>>> similars, some not.
>>> > >
>>> > > Maybe a good way forward would be to try to pinpoint the problems
>>> more precisely with an online platform such
>>> > > as http://en.arguman.org/ ? Or even just some kind of google doc...
>>> >
>>> > I think wiki page would be a better alternative.
>>> >
>>> > >
>>> > > Starting from there would maybe make it easier for the Qt devs to
>>> weigh the "for" and "against" for the stuff that is often mentioned ?
>>> >
>>> > I doubt anyone here is going to weigh anything besides patches
>>> submitted to review.
>>> >
>>> > > Instead of having to find specific arguments in 45 mails...  And
>>> then open some paths for contributions to try to alleviate the problems.
>>> > >
>>> > > My 0.0005 cents
>>> > >
>>> > > Best
>>> > > Jean-Michaël
>>> > >
>>> > > On Wed, Sep 21, 2016 at 1:53 PM, Jason H  wrote:
>>> > >>> I also can't help making a comparison with two other popular layout
>>> > >>> frameworks: WPF/XAML, and Android/AXML. In both of these worlds,
>>> the markup
>>> > >>> language and the "code-behind" class hierarchy of UI elements are
>>> > >>> absolutely equivalent 1st class citizens. Anything you can do in
>>> XAML, you
>>> > >>> can also do in the C# code-behind, whether it be creating controls,
>>> > >>> changing their properties, altering layouts, etc. Likewise in
>>> Android/AXML,
>>> > >>> I can (if I choose) create FrameLayouts, RelativeLayouts,
>>> TextViews, etc in
>>> > >>> code, and arrange them and manipulate them any way I like, as an
>>> > >>> alternative to creating an AXML designer layout.
>>> > >>>
>>> > >>> It seems unfortunate that Qt Quick doesn't take this approach, and
>>> that the
>>> > >>> "code-behind" experience is so limited. One reason that I've heard
>>> why it
>>> > >>> might have been done this way is that a rich and fully public C++
>>> interface
>>> > >>> may have hamstrung the developers too much, as there would be
>>> constant
>>> > >>> breaking changes from one release to the next. If that's true then
>>> I guess
>>> > >>> I understand that, but I would still rather put up with a rich C++
>>> > >>> interface that had breaking changes at new releases, than the
>>> relative
>>> > >>> limited C++ interface we have now.
>>> > >>
>>> > >> I'm not sure I follow. Declarituce UI is in. QML, React (+JSX)
>>> give you decaritive layouts. It convergent evolution of
>>> stucture±properties+code
>>> > >>
>>> > >> XAML, WPF, Qt Widgets all have structure and properties but no
>>> code.  You've got to create the objects then in another context, assign
>>> code to them.
>>> > >>
>>> > >> If you are taking about how QQuickItems wrap C++ my understanding
>>> is that's because of the scene graph. My perspective is that the C++ side
>>> is better before

Re: [Interest] Prevent tabbing of Qt application on macOS Sierra

2016-09-26 Thread Morten Sorvig 

> On 26 Sep 2016, at 17:39, Adam Light  wrote:
> 
> macOS Sierra added an automatic tabbing mechanism that is enabled for 
> applications by default. This behavior is entirely inappropriate for our Qt 
> 5.6 based application, and I'd like to be able to have my application opt-out 
> of this behavior.
> 
> https://developer.apple.com/library/content/releasenotes/AppKit/RN-AppKit/#10_12Window
>  Tabbing describes the API behind this feature, and includes this:
> "The application should explicitly opt-out of automatic window tabbing by 
> calling [NSWindow setAllowsAutomaticWindowTabbing:NO]"
> 
> Does anyone know how I can do this in a Qt application? My understanding of 
> Cocoa/Objective-C is minimal, and I have no idea where I would make such a 
> call.

Hi, this should be doable. I’ve tested this as far as it compiles, but did not 
have a test app at hand.

Create disableWindowTabbbing.mm with:

#import 

// Disables auto window tabbing where supported, otherwise a no-op.
void disableWindowTabbing()
{
if ([NSWindow respondsToSelector:@selector(allowsAutomaticWindowTabbing)]) {
NSWindow.allowsAutomaticWindowTabbing = NO;
}
}

Add it to the build (qmake example shown):

OBJECTIVE_SOURCES += disableWindowTabbbing.mm
LIBS += -framework AppKit

Then I think you can call it anywhere in main, before creating the window(s).

extern void disableWindowTabbing();
disableWindowTabbing();


Now perhaps Qt should disable this by default. We could do that during the
QGuiApplication constructor, giving apps that want to opt-in the opportunity
to do so afterwards.

- Morten

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Re: [Interest] How do i declare a QGeoCoordinate property in QML?

2016-09-26 Thread Paolo Angelelli 
Hi Kishore, have you tried "property var coordinate"?

best
Paolo

On Mon, 26 Sep 2016 16:11:03 +0530
Kishore Jonnalagadda  wrote:

> I have created an custom Item in which I want to have a coordinate
> property. Further i want to create aliases to the coordinates
> properties. How do i go about this?
> 
> Example:
> 
> /**/
> Item {
>   id: myCustomItem
> 
>   property coordinate coordinate
>   property alias latitude: coordinate.latitude
>   property alias longitude: coordinate.longitude
>   property alias altitude: coordinate.altitude
> }
> /**/
> 
> I have also tried the following format...
> 
> /**/
> Item {
> id: myCustomItem
> 
> property alias coordinate: coordinate
> property alias latitude: coordinate.latitude
> property alias longitude: coordinate.longitude
> property alias altitude: coordinate.altitude
> 
> Coordinate {id: coordinate}
> }
> /**/
> 
> But for some reason, the second form results in a segmentation fault.

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[Interest] Prevent tabbing of Qt application on macOS Sierra

2016-09-26 Thread Adam Light 
macOS Sierra added an automatic tabbing mechanism that is enabled for
applications by default. This behavior is entirely inappropriate for our Qt
5.6 based application, and I'd like to be able to have my application
opt-out of this behavior.

https://developer.apple.com/library/content/releasenotes/AppKit/RN-AppKit/#10_12Window
Tabbing describes the API behind this feature, and includes this:
"The application should explicitly opt-out of automatic window tabbing by
calling [NSWindow setAllowsAutomaticWindowTabbing:NO]"

Does anyone know how I can do this in a Qt application? My understanding of
Cocoa/Objective-C is minimal, and I have no idea where I would make such a
call.

Thanks
Adam
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Re: [Interest] [qt3d] Batching optimization

2016-09-26 Thread Xavier Bigand 
Doesn't the scene graph of qt3d use the instancing and sort the draw calls
to reduce the number of state changes?
In our engine the win was big when I add the sort to reduce calls of
glUniform* and glBindTexture,... especially on Android and Windows.
We don't use instancing for the moment because it's hard for us to maintain
the backend, it's one of reasons I am planning the migration to qt3d.

In my opinion for qt3d the API have to expose a flag on entity to allow or
not automatic batching.
Else the automatic batching could be applied on meshes that doesn't have a
transformation and don't require to be rendered in a particular order (like
those with alpha).

I'll made some tests on our engine to evaluate the performance win, it may
be insignificance due to the sort.


2016-09-25 11:55 GMT+02:00 Sean Harmer :

> Hi Xavier,
>
> On 23/09/2016 17:13, Xavier Bigand wrote:
>
>> Hi,
>>
>> Does qt3d backend capable to batch geometries to reduce the number of
>> draw calls?
>>
>> In our case this optimization should improve performances a lot, because
>> we generate dynamically geometries that doesn't change often and are
>> created in world coordinates (no transformations applied).
>>
>
> Qt 3D does not yet do batching automatically. However we do support stuff
> that may help you.
>
> * You can use instancing if you have GL 3.2 or newer
> * You can do your own batching by putting such geometry into a single
> buffer, either
>
> ** to be rendered as a single entity if you don't need interaction with
> the individual parts or
> ** to be rendered as separate entities with GeometryRenderer's all
> referencing the same Buffer.
>
> The latter doesn't reduce the draw call count but does minimise the state
> changes related to binding different buffers.
>
> We hope to add automatic batching in the future but we're still looking
> into a nice API to expose this without reducing the control the user has
> over organising their data.
>
> Cheers,
>
> Sean
>
>
>>
>>
>> --
>> Xavier
>>
>>
>> ___
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>>
>>
> --
> Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK
> KDAB (UK) Ltd, a KDAB Group company
> Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090
> Mobile: +44 (0)7545 140604
> KDAB - Qt Experts
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>



-- 
Xavier
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Re: [Interest] How do i declare a QGeoCoordinate property in QML?

2016-09-26 Thread Jason H 
I'm not sure I get all the nuances of what you are attempting. The 2nd one has 
a circular reference. The first once works because you provide separate storage 
via 'var' so it is not circular.
Resolve the alias down, don't go for indirection.

Item {
property alias coordinateSource: coordinate // don't know you want this to be 
aliased, you already have a ref to a coordiante.
property alias latitude: coordinate.latitude
property alias longitude: coordinate.longitude
property alias altitude: coordinate.altitude
}

Coordinate { id: coordinate}

> Sent: Monday, September 26, 2016 at 6:49 AM
> From: "Kishore Jonnalagadda" 
> To: interest@qt-project.org
> Subject: Re: [Interest] How do i declare a QGeoCoordinate property in QML?
>
> I have also tried
> /**/
> Item {
> id: myMapItem
> 
> property var coordinate
> property alias latitude: coordinate.latitude
> property alias longitude: coordinate.longitude
> property alias altitude: coordinate.altitude
> }
> /**/
> 
> In the above case which works (I think), I do not understand how to declare 
> the aliases.
> --
> Cheers!
> Kishore
> 
> On Monday 26 September 2016 4:11:03 PM IST Kishore Jonnalagadda wrote:
> > I have created an custom Item in which I want to have a coordinate property.
> > Further i want to create aliases to the coordinates properties. How do i go
> > about this?
> > 
> > Example:
> > 
> > /**/
> > Item {
> > id: myCustomItem
> > 
> > property coordinate coordinate
> > property alias latitude: coordinate.latitude
> > property alias longitude: coordinate.longitude
> > property alias altitude: coordinate.altitude
> > }
> > /**/
> > 
> > I have also tried the following format...
> > 
> > /**/
> > Item {
> > id: myCustomItem
> > 
> > property alias coordinate: coordinate
> > property alias latitude: coordinate.latitude
> > property alias longitude: coordinate.longitude
> > property alias altitude: coordinate.altitude
> > 
> > Coordinate {id: coordinate}
> > }
> > /**/
> > 
> > But for some reason, the second form results in a segmentation fault.
> 
> 
> -- 
> Cheers!
> Kishore
> ___
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Re: [Interest] How do i declare a QGeoCoordinate property in QML?

2016-09-26 Thread Kishore Jonnalagadda 
I have also tried
/**/
Item {
id: myMapItem

property var coordinate
property alias latitude: coordinate.latitude
property alias longitude: coordinate.longitude
property alias altitude: coordinate.altitude
}
/**/

In the above case which works (I think), I do not understand how to declare 
the aliases.
--
Cheers!
Kishore

On Monday 26 September 2016 4:11:03 PM IST Kishore Jonnalagadda wrote:
> I have created an custom Item in which I want to have a coordinate property.
> Further i want to create aliases to the coordinates properties. How do i go
> about this?
> 
> Example:
> 
> /**/
> Item {
>   id: myCustomItem
> 
>   property coordinate coordinate
>   property alias latitude: coordinate.latitude
>   property alias longitude: coordinate.longitude
>   property alias altitude: coordinate.altitude
> }
> /**/
> 
> I have also tried the following format...
> 
> /**/
> Item {
> id: myCustomItem
> 
> property alias coordinate: coordinate
> property alias latitude: coordinate.latitude
> property alias longitude: coordinate.longitude
> property alias altitude: coordinate.altitude
> 
> Coordinate {id: coordinate}
> }
> /**/
> 
> But for some reason, the second form results in a segmentation fault.


-- 
Cheers!
Kishore
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[Interest] How do i declare a QGeoCoordinate property in QML?

2016-09-26 Thread Kishore Jonnalagadda 
I have created an custom Item in which I want to have a coordinate property. 
Further i want to create aliases to the coordinates properties. How do i go 
about this?

Example:

/**/
Item {
id: myCustomItem

property coordinate coordinate
property alias latitude: coordinate.latitude
property alias longitude: coordinate.longitude
property alias altitude: coordinate.altitude
}
/**/

I have also tried the following format...

/**/
Item {
id: myCustomItem

property alias coordinate: coordinate
property alias latitude: coordinate.latitude
property alias longitude: coordinate.longitude
property alias altitude: coordinate.altitude

Coordinate {id: coordinate}
}
/**/

But for some reason, the second form results in a segmentation fault.
-- 
Cheers!
Kishore

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Re: [Interest] General Questions about Qt3D

2016-09-26 Thread Sean Harmer 

Hi,

On 26/09/2016 08:44, Klos, Andreas wrote:

Dear great Qt-community,



Currently I am checking out the possibilities which are provided by
Qt3D. Thereby two question were arised.



(1) Is it possible to visualize scalar measurement data, which are
stored in an common C-array? Is it possible to create a customized mesh
with the scalar data?


Yes, you can populate a Qt3DRender::QBuffer (or Buffer in QML) with your 
array. How you map this to attributes (color, vertical position, etc) in 
your shaders is entirely up to you and your specific use case.




(2) Is it possible to use Qt3D and VTK together? i know that it is
possible to render vtk data into an OpenGL rendering context. I read
that Qt3D is based on OpenGL and uses an OpenGL Rendering context. So
after my opinion it should work. Or am i wrong?


In theory yes. We borrow the OpenGL context from Qt Quick in the Scene3D 
custom item so it should be possible to do something similar for VTK but 
I have not tried it.




I would be grateful, if somebody can give me an helpfully answer
regarding to my questions.


Please feel free to post any follow up questions.

Cheers,

Sean

--
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KDAB (UK) Ltd, a KDAB Group company
Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090
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[Interest] General Questions about Qt3D

2016-09-26 Thread Klos, Andreas 
Dear great Qt-community,

Currently I am checking out the possibilities which are provided by Qt3D. 
Thereby two question were arised.

(1) Is it possible to visualize scalar measurement data, which are stored in an 
common C-array? Is it possible to create a customized mesh with the scalar data?

(2) Is it possible to use Qt3D and VTK together? i know that it is possible to 
render vtk data into an OpenGL rendering context. I read that Qt3D is based on 
OpenGL and uses an OpenGL Rendering context. So after my opinion it should 
work. Or am i wrong?

I would be grateful, if somebody can give me an helpfully answer regarding to 
my questions.

Best Regards,
Andreas
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Re: [Interest] What image format and size should I use in my QML app?

2016-09-26 Thread ekke 
Am 26.09.16 um 08:58 schrieb Артур Истомин:
> On Mon, Sep 26, 2016 at 12:45:13AM +0200, ekke wrote:
>> You're talking about Material and Universal -
>> are you using QtQuickControls2 with Material / Universal ?
> Yes, exactly
then for different density you need your images also as @2 @3 @4 sizes

compared with Icon sizes provided by Google these are equal:
per ex. /action/ic_alarm_add

24dp:
/action/ios/ic_alarm_add.imageset/
ic_alarm_add.png
ic_alarm_add_2x.png --> rename into ic_alarm_...@2.png
ic_alarm_add_3x.png --> rename into ic_alarm_...@3.png
I also need @4 for high density devices, but Google only provides up to0
@3 under /ios
You can take it from here:
/action/ios/ic_alarm_48pt.imageset/
ic_alarm_48pt_2x.png --> rename into ic_alarm_...@4.png

if you also need 18dp, 36dp... do it similar

be aware that there are black and white Images - depends on dark or
light theme what's recommended

>
> p.s. by the way, thank you for your excellent blog posts about
> creating apps with Qt Quick. This is the best that I found on
> Internet. They are real life and it is invaluable for novice like
> me.
thx
I also just started this yxear with Qt 5.7 / Qt Quick Controls 2 - did
4+ years BlackBerry10 mobile App Development

take a look at my example apps there are already many Images from Google
renamed and provided
it's some work but I like all these Icons for Google Material and
renaming is less work as designing my own
>
>> Am 25.09.16 um 22:21 schrieb Артур Истомин:
>>> I want to use images for icons from google's icons set. 
>>> For example https://design.google.com/icons/#ic_search
>>>
>>> So I have options: 18dp, 24dp, 36dp, 48dp PNGs or SVGs. Moreover
>>> if I choose PNG format, there are 5 different images for different
>>> screens: hdpi, mdpi, xhdpi, xxhdpi, xxxhdpi.
>>>
>>> My software targets Android and Windows (desktop) devices with different
>>> screens and resolution and will have Material and Universal UI 
>>> respectively. 
>>> The app is writen with Qt Quick.
>>>
>>> What should I use? 
>>>
>>> Thank you!
>>> ___
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>>>
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international development native mobile business apps
BlackBerry 10 | Qt Mobile (Android, iOS)
workshops - trainings - bootcamps

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max-josefs-platz 30, D-83022 rosenheim, germany
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Re: [Interest] What image format and size should I use in my QML app?

2016-09-26 Thread Артур Истомин 
On Mon, Sep 26, 2016 at 12:45:13AM +0200, ekke wrote:
> You're talking about Material and Universal -
> are you using QtQuickControls2 with Material / Universal ?

Yes, exactly

p.s. by the way, thank you for your excellent blog posts about
creating apps with Qt Quick. This is the best that I found on
Internet. They are real life and it is invaluable for novice like
me.

> 
> Am 25.09.16 um 22:21 schrieb Артур Истомин:
> > I want to use images for icons from google's icons set. 
> > For example https://design.google.com/icons/#ic_search
> >
> > So I have options: 18dp, 24dp, 36dp, 48dp PNGs or SVGs. Moreover
> > if I choose PNG format, there are 5 different images for different
> > screens: hdpi, mdpi, xhdpi, xxhdpi, xxxhdpi.
> >
> > My software targets Android and Windows (desktop) devices with different
> > screens and resolution and will have Material and Universal UI 
> > respectively. 
> > The app is writen with Qt Quick.
> >
> > What should I use? 
> >
> > Thank you!
> > ___
> > Interest mailing list
> > Interest@qt-project.org
> > http://lists.qt-project.org/mailman/listinfo/interest
> >
> 
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