[Interest] Guide me through the Qt offerings for GUIs

Giuseppe D'Angelo giuseppe.dangelo at kdab.com
Mon Apr 19 14:36:13 CEST 2021

On 18/04/2021 14:50, Roland Hughes wrote:
> I guess QML is more present in embedded? Or maybe some entreprise stuff
> we don't know about...
> Just phones and John Deere. 

This is false, as a quick walk through the customer showcase on TQC's 
website will show.

> QML was a bad idea trying to get around a legacy problem without
> actually fixing the legacy problem. The legacy problem is the single
> thread-i-ness of Qt. Back when Intel was selling 486 chips with a
> manufacturing defect as SX

This is also false. SXs have never been defective CPUs.

> All of this is why I'm so excited to read about the Vulkan stuff going
> on with the CsPaint library and the Vulkan links I sent you earlier. On
> the surface it seems like someone talked to people who write software on
> big computers before work started. Need to dig deeper to be really
> certain, but you communicate with a "loader" that can support many revs
> of the API.

Are you aware that Qt has had Vulkan integration classes since 5.12 (?), 
and Vulkan can be used as a Qt Quick backend in Qt 6?

The ability of painting from multiple threads (or better, to build 
command buffers from multiple threads) doesn't magically solve the 
problem of manipulating data structures safely from multiple threads. 
The single threaded CPU-based _painting_ of the syntax highlighting has 
hardly ever been an issue; its _generation_ has, as it involves 
modifying a shared data structure (while also the user is modifying it) 
without races and without locking against the GUI thread. QTextDocument 
design is unlikely to fit the bill here; a different design sounds 
anything but easy, but the underlying graphics API has very little to do 
with this.

Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

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