Eclipse SWT Project Co-Lead Equinox (Launcher) Committer … to... · Eclipse SWT Project Co-Lead Equinox (Launcher) Committer IBM [email protected] ... Webkit is embedded

Arun Thondapu

Eclipse SWT Project Co-Lead

Equinox (Launcher) Committer

IBM

[email protected]

3/12/2015EclipseCon NA 2015

1

Motivation

Evolution of GTK+

Porting SWT to GTK+ 3

Challenges

Solutions

Collaboration

WIP

What’s Next ??

Wayland support

Broadway, HTML 5

GTK+ 4

3/12/2015EclipseCon NA 2015 2

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


3/12/2015EclipseCon NA 2015 4"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

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)


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


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


libgtk-x11-2.0.so.0

libswt-pi-gtk-****.so libswt-pi3-gtk-****.so

libgtk-3.so.0

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


The modern GTK+ drawing model


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!


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?


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


Eclipse Mars

GTK+ 3 always (assuming it is installed and available)

Eclipse Luna, SR1 & SR2

GTK+ < 3.10 => GTK3

GTK+ >= 3.10 => GTK2


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…


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.


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.





• Rudimentary support available at

this stage

• Google Summer of Code 2014

project by Joshua Barkovic


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


http://127.0.0.1:8080/


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.


Animations

Effects

Transformations

Event bubbling

No more GDK windows

Multimedia


Scene graph

Improved CSS support

Better cross-platform story

Better support for application development

Touch and gesture support

Focus on HIG


“GTK+ 4 shall be as

rock-stable (and

hence "boring") as

GTK+ 2”




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Eclipse SWT Project Co-Lead Equinox (Launcher) Committer … to... · Eclipse SWT Project Co-Lead Equinox (Launcher) Committer IBM [email protected] ... Webkit is embedded