[Development] Updating community Qt4 port for OS/2 to Qt5

[Paul Smedley]

Hi Robin,

On 05/08/17 22:28, Robin Burchell wrote:
> On Sat, Aug 5, 2017, at 11:41 AM, Paul Smedley wrote:
>> Thanks for the reply. Any hints on the minimal files necessary for gui
>> apps to work. At this stage, I'm not fussed about clipboard, drag and
>> drop, etc, just the bare minimal to get gui apps working.
> 
> Hi Paul,
> 
> So the basic idea you've probably already gathered is that each platform
> needs to implement a "QPA" plugin:
> https://wiki.qt.io/Getting_Started_With_Lighthouse covers some of the
> basics here, but in a little more detail:
> 
> A QPA plugin provides the glue for things like windowing and input
> between Qt and a native windowing system. To start with, take a look at
> the 'minimal' QPA plugin (which just does software rendering, AFAIR
> directed to image files on disk), and look at how to fill in things from
> there -- the starting points you'll want are a QPlatformIntegration,
> QPlatformWindow, and QPlatformBackingStore. You want to look at
> QWindowSystemInterface to deliver events (like expose events saying
> "please start/stop rendering the window", and input events) from your
> QPA plugin to QtGui.
> 
> What you want past there is a bit more fuzzy and depends both on how
> complete you want your integration to be and what your platform
> provides, e.g. QPlatformClipboard and stuff like that, but I'd put most
> of that stuff in the "optional extras" basket.
> 
> As you've already figured out, the structure and code involved is quite
> different, so I doubt it'll be a 1:1 port - but the existing plugins
> provide pretty good guidance on how to lay things out, and your existing
> code would be adaptable without too much work I think.

Thanks - this is the kind of this I was looking for. Appreciate the tips!

Cheers,

Paul