We have seen the many questions and the concerns raised about our commitment to C++ and QWidget in Qt 5. I thought now would be a good time to address some of these concerns in this post.
The post on the Qt 5 alpha was focused on the new things we enable and add with Qt 5.
Let me just state it very clearly here:
You can continue writing your application in exactly the same way as you have been doing with Qt 4.x.
We have promised to try to keep as much source compatibility with Qt 4.x as we can. And of course this includes QWidget and your application written in C++. This is not going away. Yes, the Qt Widgets module we have in Qt 5 is right now marked as 'done', which means we don't have anybody actively working on new features for the module at this point in time. But this can change any day if someone has some interest or need to do more active development in this area.
What we did with Qt 5 is to add a new way to do applications with QML. I personally believe that over time we will see more and more apps being written that way, as I believe it is the better solution in the long term.
New user interfaces such as the Windows 8 Metro UI are not things we could simply add to our existing QWidget infrastructure. Adding support for the kind of animations used in these user interfaces is extremely difficult using QWidgets, as they were designed for the mostly static user interfaces that predominated until a couple of years ago.
The fluid animated user interfaces that are already there on Devices such as smartphones and tablets are now also starting to appear also on desktops. And they are simply not implementable using the QWidget infrastructure.
This implies that we needed to do something new here. And QML/Qt Quick was the answer we came up with to solve this problem. That's why we're investing in that area.
It really is up to everybody what they make out of the options being given by Qt 5, and how they best like to use them.
We have done significant work for Qt 5 adding many new C++ APIs. We have added support for C++11 in many places. And we'll continue to do so, because larger scale applications written with Qt will be mostly written in C++ for a long time to come. And there's nothing bad about this.
With Qt 5, if you want to use Qt as you have always used it, please go ahead. It's a fully supported way of doing things.
But I do believe that we will need more then what we have in Qt 4 for the longer term future. The expectations towards application UIs are changing drastically, especially when creating consumer-facing apps.
We need to have solutions available if we want Qt to stay relevant. That's what Qt 5 is all about.
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Qt 5.12 was developed with a strong focus on quality and is a long-term-supported (LTS) release that will be supported for 3 years.
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