Tag Archives: kirigami

QtQuickControls2 and Desktop apps

GraphicsSoftware

In the screenshot below, the desktop/Breeze-looking scrollbar it’s actually a control coming from QtQuickControls2.
spectacle-c13179

Since one of the goals of Kirigami is to support also desktop applications, while working on Kirigami 2 (that is mostly porting it to be based on top of QtQuickControls2) I had the need for it to continue to integrate with desktop applications as well.
Unfortunately, desktops are not the primary target for QtQuickcontrls2, and while in Qt 5.9 some much needed desktop-related features, such as mouseover effects are getting back in, being as unrecognizable as possible with QWidget-based applications is definitely not in the roadmap.

Luckily, theming QQC2 is easy, so I’ve started a QtQuickControls2 style that integrates with desktop QStyle-based widgets (actually, based upon the QtQuickControls1 QStyle painter machinery).

If we are serious in using QtQuickControls2 in applications shipped together Plasma, we also must make sure they integrate well with the Plasma desktop’s Breeze look and feel.

I started by theming the scrollbar because I felt it was one of the hardest controls to do.
in QtQuickControls2 the scrollbars are supposed to be an attached property of flickables..
This is pretty simple for the mobile use case, turns out it’s a nightmare to create scrollbars that behave like we are used to in the desktop (unless you’re on mac, which insists to look more and more like iOS), which need to be

  • always visible
  • have optional little arrow buttons for increment/decrenent
  • be besides the flickable, not overlapping the contents, because again, they’re always visible
  • use the global desktop theme

I’ve been able to do all of the following, tough it’s necessary to reintroduce the QtQuickcontrols1 component called ScrollView (which imo was a mistake to remove in QtQuickControls2) which can correctly lay out and size the Flickable relative to its ScrollBar.
Hopefully, you’ll be soon able to build an application with QtQuickcontrols2 and Kirigami2 that feels right at home in a Plasma desktop.
What about Plasma-themed QQC2 controls for plasmoids? that will come too, of course!

Kirigami 1.1

Software

Today the first feature update of Kirigami has been released.
We have a lot of bug fixes and some cool new features:

The Menu class features some changes and fixes which give greater control over the action triggered by submenus and leaf nodes in the menu tree. Submenus now know which entry is their parent, and allow the submenu’s view to be reset when the application needs it to.
The OverlaySheet now allows to embed ListView and GridView instances in it as well.
The Drawer width now is standardized so all applications look coherent from one another and the title now elides if it doesn’t fit. We also introduced the GlobalDrawer.bannerClicked signal to let applications react to banner interaction.
SwipeListItem has been polished to make sure its contents can fit to the space they have and we introduced the Separator component.
Desktop Kirigami applications support the “quit” shortcut (such as Ctrl+Q) now.

Plasma 5.8 will depend from Kirigami 1.1, so if you are planning to write a Kirigami-based application, it will work by default and nicely integrate in the Plasma 5.8 desktop.

Plasma 5.8 also has a new big user for Kirigami 1.1, that is Discover: the application to search and install for new software, has a brand new user interface, based upon Kirigami.

plasma-5-8-discover

This is problably the last feature release based upon QtQuickControls 1, QtQuickControls 2 version is on the way at an experimental stage. The port will have way simpler code (and smaller memory footprint) but this is an entry for another day πŸ™‚

Little Plasma things at CERN

BlaBlaSoftware

Over the second week of March I’ve been at the sprint at CERN.
It has been an amazing experience seeing those very big toys, where the cutting edge research is done (noted with satisfaction the presence of Plasma desktops in the CMS control room)
On my side, some interesting little things happened:

All new systemtray finished and merged

During the sprint I’ve merged a thing i was working since a while: the system tray of Plasma was one of the most complicated plasmoids out there due to the very peculiar things it does.
Its code was really showing its age (it surviced at least 3 portings across different technologies) and even tough the old Xembed-based systray icon protocol was dropped, its architecture was still decidedly all
It has now been completely rewritten, its code is now way simpler, using less layers of proxymodels and went from ~2000 locs of C++ to ~300
While completely new, the users shouldn’t even notice any UI change, the only noticeable change should be less bugs and working better πŸ˜‰

Kirigami

kirigami
During the sprint, a new repository was born.
What was Plasma Mobile components is now residing in a separate git repository:
https://quickgit.kde.org/?p=kirigami.git
Kirigami (The names comes from a Japanese paper folding craft similar to Origami, but unlike Origami cutting the paper is allowed) is a set of QtQuick components at the moment targeted for mobile use (in the future desktop as well) targeting both Plasma Mobile and Android. It’s not a whole set of components, all the “Primitive” ones like buttons and textboxes are a job for QtQuickControls (soon QtQuickContrls2) but it’s a set of high level components to make as easy as possible making applications that look gorgeous on mobile devices that follow the Visual Design Group UI guidelines.
The target of those components is anybody that wants to do an application using QtQuick as its main UI, especially if targeting a mobile platform, without adding many dependencies. They work both in Plasma Mobile and Android.
It will eventually become a Tier-1 KDE Framework.

Subsurface

While I was refining the components, it turns out a piece of desktop software just has its first release of its Android port, it is already using a tech preview of the Kirigami components: it’s Subsurface a dive log software started some years ago by Linus Torvalds (in GTK+) and recently ported over Qt (here a talk by one of its main developers Dirk Hohndel about the porting process https://www.youtube.com/watch?v=ON0A1dsQOV0)
It’s awesome having already an early adopter (which has been a pleasure to work with) for the components and also means we are getting a ton of feedback on it.