Get rid of Qt3Support Module

[dyollb]

In order to allow iSEG to switch to Qt5, we need to get rid of Qt3Support.
The main use of Qt3Support is the layout of widgets and possible in some legacy API functions, like isOn vs isChecked.

child of ITISFoundation/osparc-simcore#580

[matteomaspero]

Hi all,

I wonder how far is this issue right now? We would like to install on windows but on Debian 11 but qt4 or lower are not supported anymore. So any idea when porting to qt5 will be ultimate? Thanks a lot in advance,

Matteo

[dyollb]

I haven't had enough time to complete this. The remaining work is

• fixing function calls to qt3support api
• porting the image viewer widget & zoom functionality, because it uses Q3ScrollView:

  osparc-iseg/iSeg/MainWindow.h

  Line 267 in 6f38924

  Q3ScrollView* m_BmpScroller;

• changing dependency to qt5, fix stuff deprecated in qt5

I would be happy to review/merge any pull requests though.

[matteomaspero]

I'd love to port it, but without qt5, I do not get access to a working environment/version in our current OS. Hopefully, someone else may pick this up in the short term

[dyollb]

on ubuntu 18.04 there is still a qt4 package. see the github workflow here for building iseg: https://github.com/ITISFoundation/osparc-iseg/blob/master/.github/workflows/build.yml

on ubuntu 20.04 you need to add a thirdparty ppa, e.g. (untested)

sudo add-apt-repository ppa:rock-core/qt4

[dyollb]

@matteomaspero I reactivated my stale branch #126 and made a bit more progress. The last obstacle is the Q3ScrollView instances, which are synched for zooming/panning. I will continue in the next days on that issue, and then we should be able to move to qt5.