Re: [Interest] QNAM timeout is way too long
On 22 April 2014 03:12, Scott Aron Bloom scott.bl...@onshorecs.com wrote: Agreed.. but it would be even easier... if abort was a slot :) It is a slot in Qt 5. Besides, you can always connect to a custom slot which invokes abort()... -- Giuseppe D'Angelo ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QAbstractItemDelegate like interface for QHeaderView.
D. Brentjes schreef op 20-4-2014 09:40: Hello everybody, I'm using the ItemDelegate system to last minute convert all my custom object to a QString representative of the content. This works great, but yesterday I discovered that QHeaderView actually does not use the ItemDelegate facility. True. It has also been documented that way, even though the API suggests otherwise. Has this been done deliberately, That seems likely, yes. and would it still be possible to convert the data in a similar way for the QHeaderView. Sure. Just subclass QHeaderView and do your work there, or adapt your model (or use a proxy model) to provide the conversion instead of relying on the view to do the work. André ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Failed to fetch Nokia Map using QtLocation
Hi,
am trying to run places_map QtLocation example. However, am getting error
Failed to read nokia map version.
I set Map-plugin parameters with heremaps registered credentials like below:
PluginParameter { name: app_id; value: }
PluginParameter { name: token; value: }
PluginParameter { name: proxy; value: system }
Thanks and Regards,
Ramakanth
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Re: [Interest] Failed to fetch Nokia Map using QtLocation
Hi,
This message should only appear the first time you start Nokia based mapping
services. The second time around it is gone. I get the same message when I
remove the entire QtLocation cache (in my case ~/.config/QtLocation) directory.
My guess is that your problem is related to the missing app_id and token. Nokia
maps require them. You should also get another warning like:
Error message:Qt Location requires app_id and token parameters.
Please register at https://developer.here.com/ to get your personal
application credentials.
Or did you mean to say that you do set the values (but just left them out from
your mail) but still don't get any tiles? If so does dragging the map make a
difference?
--
Alex
From: interest-bounces+alexander.blasche=digia@qt-project.org
[interest-bounces+alexander.blasche=digia@qt-project.org] on behalf of
Ramakanthreddy Kesireddy [ramakanthreddy.kesire...@techmahindra.com]
Sent: Tuesday, April 22, 2014 16:10
To: interest@qt-project.org
Subject: [Interest] Failed to fetch Nokia Map using QtLocation
Hi,
am trying to run places_map QtLocation example. However, am getting error
Failed to read nokia map version.
I set Map-plugin parameters with heremaps registered credentials like below:
PluginParameter { name: app_id; value: }
PluginParameter { name: token; value: }
PluginParameter { name: proxy; value: system }
Thanks and Regards,
Ramakanth
DISCLAIMER:
This email (including any attachments) is intended for the sole use of the
intended recipient/s and may contain material that is CONFIDENTIAL AND PRIVATE
COMPANY INFORMATION. Any review or reliance by others or copying or
distribution or forwarding of any or all of the contents in this message is
STRICTLY PROHIBITED. If you are not the intended recipient, please contact the
sender by email and delete all copies; your cooperation in this regard is
appreciated.
Disclaimer: This message and the information contained herein is proprietary
and confidential and subject to the Tech Mahindra policy statement, you may
review the policy at http://www.techmahindra.com/Disclaimer.html externally
http://tim.techmahindra.com/tim/disclaimer.html internally within TechMahindra.
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Re: [Interest] Can a view somehow notify a model of which rows it is going to show on screen?
Mark Gaiser schreef op 20-4-2014 4:04: Hi, the title says it all... I can't find any signals that expose this information in the model. I would like to know this from the QML ListView component. What i can do is tell the model where the current y position is in the models content and the height of each row. That gives me enough information to calculate which rows are visible, but i'm hoping there is some way out there that i just haven't discovered yet. I'm asking because i have a big dataset and only want to sort the data that is visible for the user (partial_sort along with nth_element will do that). AFAIK, there are no facilities for that. The way to know what data is needed, is simply to respond to the data() calls in QAbstractItemModel. Only rows that are needed are (should be) fetched. But that information is not shared in advance. Are you sure that this is your performance bottleneck though? To me, it sounds like premature optimization to worry about this and to try to optimize this. André ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Can a view somehow notify a model of which rows it is going to show on screen?
On Tue, Apr 22, 2014 at 9:38 PM, Andre Somers an...@familiesomers.nl wrote: Mark Gaiser schreef op 20-4-2014 4:04: Hi, the title says it all... I can't find any signals that expose this information in the model. I would like to know this from the QML ListView component. What i can do is tell the model where the current y position is in the models content and the height of each row. That gives me enough information to calculate which rows are visible, but i'm hoping there is some way out there that i just haven't discovered yet. I'm asking because i have a big dataset and only want to sort the data that is visible for the user (partial_sort along with nth_element will do that). AFAIK, there are no facilities for that. The way to know what data is needed, is simply to respond to the data() calls in QAbstractItemModel. Only rows that are needed are (should be) fetched. But that information is not shared in advance. I figured out a way to do it fairly accurate. Each ListView has the the itemAt function [1]. That allows you to get your index from any position in the _content_ area. That alone isn't enough since you still need to figure out which part of your content area is shown. That information is luckily available (and is also used for creating a scrollbar). It's the contentY[2] property. Now, if you use itemAt with the contentY property we know the beginning pixel of our view and itemAt neatly shows us which index belongs on that position. Next, we still need to know the last item in the view. To figure that you we simply do: yBottomPos = contentY + height (height is the height of your listview itself) There we have it. All visible item indexes accurately known. :) I think i just answered myself, hehehe Are you sure that this is your performance bottleneck though? To me, it sounds like premature optimization to worry about this and to try to optimize this. You can see it both ways. Usecase: If you only look at small folders then this definitely is premature optimizations since the regular sorting will do just fine there. Bit if you look at insanely massive folders with 500.000 items. All stuffed in one ListView (where you only see ~50 or so). Sorting that by string in a natural way (using QCollator) is very slow. In my case ~6 seconds. I know that giving a ListView a task with that many items is insane and in most cases you're probably better of splitting the data in chunks. This however is a difficult thing to do with massive folders so i'm optimizing for that case. The assumption is that it's implementation will be fine for small folders, but absolutely necessary for massive folders. I already have it partly working, but it is very difficult to get it working right by sorting (partial_sort actually) as little items as possible. That requires a bit of complicated bookkeeping. In reality this will unlikely be an issue - ever. The only place where you can begin to see it's benefit is when browsing through large folders like /usr/bin and /usr/lib on linux. [1] http://qt-project.org/doc/qt-5/qml-qtquick-listview.html#indexAt-method [2] http://qt-project.org/doc/qt-5/qml-qtquick-flickable.html#contentY-prop ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
