1 IBM arunkumar.thondapu@in.ibm.com EclipseCon NA 2015 3/12/2015 - PowerPoint PPT Presentation

Arun Thondapu Eclipse SWT Project Co-Lead Equinox (Launcher) Committer 1 IBM arunkumar.thondapu@in.ibm.com EclipseCon NA 2015 3/12/2015

 Motivation  Evolution of GTK+  Porting SWT to GTK+ 3  Challenges  Solutions  Collaboration  WIP  What’s Next ??  Wayland support  Broadway, HTML 5  GTK+ 4 2 EclipseCon NA 2015 3/12/2015

 Linux vs Others  Significant changes in underlying windowing system (GTK+)  Separate API and ABI incompatible streams  How to be on the “bleeding edge”  Need parallel streams of development and maintenance  Open and diverse nature of Linux distributions = support for a large range of GTK+ versions 3 EclipseCon NA 2015 3/12/2015

"GTK+ software architecture" by Shmuel Csaba Otto Traian. Licensed under CC BY-SA 4.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:GTK%2B_software_architecture.svg#mediaviewer/File:GTK%2B_software_architecture.svg 4 EclipseCon NA 2015 3/12/2015

 Originally designed and used in the GNU Image Manipulation Program (GIMP) as a replacement of the Motif toolkit.  GTK+ 2.0  improved text rendering using Pango  a new theme engine  improved accessibility using ATK  complete transition to Unicode using UTF-8 strings  more flexible API and new widgets  usage of Cairo graphics library for rendering vector graphics (since version 2.8) 5 EclipseCon NA 2015 3/12/2015

 GTK+ 3  cairo drawing throughout, GDK no longer wraps the antiquated X11 drawing API  modern input device handling via XInput2  new theming API with CSS syntax for theme configuration and animations  multiple backend support for GDK (including experimental support for Wayland and HTML5)  integration of D-Bus support in GIO  use GIO for launching applications  new widgets, such as a switch and an application chooser  improved support for touch and gestures 6 EclipseCon NA 2015 3/12/2015

 Primary goal was a seamless user experience on a wide variety of Linux versions irrespective of underlying versions of GTK+ shipped by them.  to be as backward compatible as possible  in contrast to most native GTK+ apps including GNOME libswt-pi-gtk-****.so libswt-pi3-gtk-****.so libgtk-x11-2.0.so.0 libgtk-3.so.0 7 EclipseCon NA 2015 3/12/2015

 Do not include individual headers  Do not use deprecated symbols  Use accessor functions instead of direct access  Replace GDK_<keyname> with GDK_KEY_<keyname>  Use GIO for launching applications instead of the gdk_spawn family of functions  Use cairo for drawing  GdkGC and GdkImage are removed  gdk_draw family of functions are gone  GtkWidget “expose - event” signal has been replaced by a new “draw” signal 8 EclipseCon NA 2015 3/12/2015

 The modern GTK+ drawing model 9 EclipseCon NA 2015 3/12/2015

 Many great and diverse contributions from community (led by Red Hat team) towards the GTK+ 3 port  Much more stable and usable now  Please continue to test, report bugs and contribute patches! 10 EclipseCon NA 2015 3/12/2015

 Working on resolving most major outstanding problems before Mars  Bugzilla summary tags – GTK3, GTK 3.10  Lots more stuff being deprecated and replaced by GTK+  GdkColor is being replaced by GdkRGBA  Many enhancements as well but we may not be able to adopt right now, stability is the major concern  Lack of backwards-compatibility in major updates continues to be an issue  Can we aggressively drop support for older versions of GTK+ 2.x? 11 EclipseCon NA 2015 3/12/2015

 Mars drops support for GTK+ < 2.18  How to find out which version of GTK+ is being used by my Eclipse or SWT application?  Use the Java property org.eclipse.swt.internal.gtk.version  Prevent linking against GTK+ 2.x and GTK+ 3.x in the same process  Leads to unexpected hangs or hard-to-diagnose crashes 12 EclipseCon NA 2015 3/12/2015

 Eclipse Mars  GTK+ 3 always (assuming it is installed and available)  Eclipse Luna, SR1 & SR2  GTK+ < 3.10 => GTK3  GTK+ >= 3.10 => GTK2 13 EclipseCon NA 2015 3/12/2015

 Webkit is embedded by default on Linux but XULRunner is also supported  libwebkitgtk-1.0-0 vs. libwebkitgtk-3.0-0  libwebkitgtk-1.0-0 is not installed by default on some distros => Luna and earlier do not have an active browser in Eclipse!  libwebkit2gtk-3.0-25 vs. libwebkit2gtk-4.0-37  XULRunner does not have a GTK+ 3 port yet… 14 EclipseCon NA 2015 3/12/2015

 Wayland is intended as a simpler replacement for X, easier to develop and maintain.  Origins in initial effort towards X12.  Hardware and applications are constantly evolving, X11 extensions are unable to fill in the gaps anymore.  Design and build a new display server from scratch focusing on modern platforms. 15 EclipseCon NA 2015 3/12/2015

 Wayland is a display protocol for a compositor to talk to its clients as well as a C library implementation of that protocol.  Weston reference implementation is the only Wayland compositor as of now.  Eliminates needless complexity and improves performance compared to X11.  Smaller footprint.  Designed to work well with non-PC interfaces (embedded devices, tablets and phones).  Shipped on a number of embedded products, phones, and tablets.  For the desktop, GNOME and KDE ports to Wayland (and of course the protocol itself) are currently WIP. 16 EclipseCon NA 2015 3/12/2015

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Rudimentary support available at • this stage Google Summer of Code 2014 • project by Joshua Barkovic 20 EclipseCon NA 2015 3/12/2015

 GDK Broadway backend provides support for displaying GTK+ applications in a web browser, using HTML5 and web sockets.  GDK_BACKEND = broadway  http://127.0.0.1:8080  Works only with GTK3  Use multiple GTK+ applications in the same web browser window, by using the Broadway server, broadwayd , that ships with GTK+.  broadwayd :5  BROADWAY_DISPLAY - Specifies the Broadway display number.  BROADWAY_DISPLAY=:5 gedit 21 EclipseCon NA 2015 3/12/2015

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 Can SWT itself use web (HTML5) based elements to build the UI of the application instead of the OS's native widgets?  Eclipse running inside a web browser?  Allows CSS customization of UI.  Eclipse integration with Orion and Flux in a browser. 23 EclipseCon NA 2015 3/12/2015

 Animations  Scene graph  Effects  Improved CSS support  Transformations  Better cross-platform story  Event bubbling  Better support for application development  No more GDK windows  Touch and gesture support  Multimedia  Focus on HIG 24 EclipseCon NA 2015 3/12/2015

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“ GTK+ 4 shall be as rock-stable (and hence "boring") as GTK+ 2” 26 EclipseCon NA 2015 3/12/2015

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Evaluate the sessions Sign in: www.eclipsecon.org +1 0 -1 29 EclipseCon NA 2015 3/12/2015