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Re: Run a GTK application without desktop environment

Yes,

That is because tookits tend to push "policy" on to the programmer.

But for a kiosk you don't need it. And the "functionality" of the
window-manager is sometimes nuicence for the application.

You have to give *one* example why a kiosk application *needs* a
window-manager.

/gh

Den 2016-03-18 kl. 06:11, skrev Jasper St. Pierre:

Except for all the functionality that is provided by the window manager:

http://www.x.org/releases/current/doc/xorg-docs/icccm/icccm.html#Client_to_Window_Manager_Communication
https://specifications.freedesktop.org/wm-spec/wm-spec-latest.html

I was the lead developer of the mutter window manager for a good 3-4
years, and I also worked on GTK+ a lot. Toolkits might appear to work
without a WM in place, but there will be lots of subtle behavior
differences.

The X11 protocol indeed has a design decision of "mechanism, not
policy", which means that since the policy *isn't* in the X server, it
must be somewhere else. That somewhere else is, in a lot of cases, the
window manager.

On Thu, Mar 17, 2016 at 10:07 PM, Göran Hasse <gorhas raditex nu> wrote:

Hello!

No not at all!

The window manager is just a "helper". Infact the W-window
system was written as a "policyfree" environment. It was a design idea *not to have*
the application dependent on the window - mangager". So this is *not* a strange
thing at all. *NO*! functionality is dependent on the window mangager!

Some programing toolkit are a little bit crippeled to handle itself in
respect with resize, fonts and sutch. Gtk have some issues without
window mangager - but not mutch. If you write a X-window application without
a toolkit you have compleet control. (This is *verry* akward though).

So if you want to write a kiosk there is *no need* to have a window manger.

/gh

Den 2016-03-18 kl. 06:00, skrev Jasper St. Pierre:

I highly recommend against this. A window manager should be around to
manage windows, since a lot of functionality to applications is
provided by the WM. Having it missing could cause strange bugs.

Please just use a lightweight window manager like Matchbox or metacity.

On Thu, Mar 17, 2016 at 9:33 PM, Göran Hasse <gorhas raditex nu> wrote:

This is quite simple.

You have to send in the geometry to the GTK application so that is self
can decide its geometry.

You don't need any window manager.

I run a lot of FreeBSD computers this way.

In rc.local you run something like

-------------------------------
#!/usr/local/bin/bash

/usr/sbin/ntpdate -s 0.ubuntu.pool.ntp.org

DISPLAY=:0.0
export DISPLAY

/usr/local/bin/X -ac &

# Let the x-server have time to start
sleep 20

# Connect from any IP
/usr/local/bin/xhost + &

# Remove the cursor from the screen, turn off screensaver
/usr/local/bin/unclutter -root -idle 1 &
/usr/local/bin/xset -dpms &
/usr/local/bin/xset s off &

# set background
# https://en.wikipedia.org/wiki/X11_color_names
/usr/local/bin/xsetroot -solid Grey &

# show local time
TZ=CEST
export TZ

# Startscript for infotable at LEV
DISPLAY=192.168.37.88:0.0 ./draw-text -x 0 -y 0 -X 896 -Y 307 -g logo -L "" -f 100 &
...

----------------------------------------------------

Note that the gtk-widget have to "resize" itself. So you must program it to
read its own "geometry". x , y , X  Y (and some other stuff).

/gh

Den 2016-03-18 kl. 01:30, skrev Anatol Pomozov:

Hi

I am trying to implement a simple Kiosk-like web application. The
application will run fullscreen all the time and show web pages. I my
case it will be project's build status. I want to use a simple
computer like a RaspberryPi. And I want to avoid starting heavy
environments like KDE or Gnome.

Is there any good example/tutorial on this topic?

In fact I already have a simple GTK application that uses WebKit
engine. I can run it both in Gnome and without it by using xinit. I
have a few questions about it:

- gtk_window_fullscreen() works fine with Gnome but with xinit it does
not expand the window. Does it mean that fullscreen is actually a DE
feature? What is the best way to make fullscreen app in XWindow? Right
now I use gdk_screen_get_width/height and then set default size.

- If I run webkit in XWindows it shows pages with horrible fonts. How
to make the browser fonts similar to what I see in my Gnome desktop?
Where to start reading about font handling in the modern Linux
graphical stack?

- It looks like Kodi player at RaspberryPi does not not use xinit at
all. It looks like RaspberryPi has a direct framebuffer feature. Is it
possible to do it with my webkit-centric application? I can't find any
details on this topic.

Did anybody make something similar? I would love to hear the
experience in making DE-less applications.
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--
Göran Hasse
Raditex Control AB
http://www.rscada.se
OrgNr: 556611-8773
email: gorhas raditex nu
tel: 019-450105
mob: 070-5530148
_______________________________________________
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gtk-list gnome org
https://mail.gnome.org/mailman/listinfo/gtk-list






--
Göran Hasse
Raditex Control AB
http://www.rscada.se
OrgNr: 556611-8773
email: gorhas raditex nu
tel: 019-450105
mob: 070-5530148






-- 
Göran Hasse
Raditex Control AB
http://www.rscada.se
OrgNr: 556611-8773
email: gorhas raditex nu
tel: 019-450105
mob: 070-5530148
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