Applet programming

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hanoii
Posts: 7
Joined: Mon Nov 29, 2010 11:14 pm

Applet programming

Postby hanoii » Sun Dec 05, 2010 3:34 pm

Is there any docs or pointers into lxde applet programming?

I searched but couldn't find anything.

Also, what I am interested in doing is something rather simple. I liked the kde clock where I can choose other timezones to display on mouseover on the clock (I work with other countries and I find useful to quickly check the time on other places) and I was tempted on either writing a new clock applet myself or even contributing to the ones that's currently there.

Any suggestions on this will be as appreciated as well.

Thanks,
a.=

percival
Posts: 2
Joined: Sat Dec 18, 2010 6:42 pm

Re: Applet programming

Postby percival » Sat Dec 18, 2010 6:51 pm

LXDE uses the gtk applet framework, the same that gnome uses. This is why many gnome applets work in LXDE. There are some tutorials for this out there.

The clock applet is one of the core lxpanel applets, so it can be found in the lxpanel source. I believe the gnome clock has a similar feature to this, there's a location choice bar under the calendar that pops up when you click on it. You might want to check out the gnome-panel source for some inspiration.

Marty Jack
Posts: 381
Joined: Mon Mar 23, 2009 5:14 am

Re: Applet programming

Postby Marty Jack » Sat Dec 18, 2010 7:38 pm

percival wrote:LXDE uses the gtk applet framework, the same that gnome uses. This is why many gnome applets work in LXDE. There are some tutorials for this out there.

The clock applet is one of the core lxpanel applets, so it can be found in the lxpanel source. I believe the gnome clock has a similar feature to this, there's a location choice bar under the calendar that pops up when you click on it. You might want to check out the gnome-panel source for some inspiration.


So no one is confused, this answer is completely incorrect (beyond the fact that LXDE and GNOME are both built on the GTK toolkit). GNOME applets do not work in LXDE. LXDE has its own implementation of the applets that it offers.

percival
Posts: 2
Joined: Sat Dec 18, 2010 6:42 pm

Re: Applet programming

Postby percival » Mon Dec 20, 2010 8:45 pm

mm, sorry about that. I was thinking of systray icons.

jgillich
Posts: 3
Joined: Fri Dec 10, 2010 9:49 pm

Re: Applet programming

Postby jgillich » Sat Dec 25, 2010 6:17 am

systray icons: http://standards.freedesktop.org/system ... ec/latest/
lxpanel plugins: http://wiki.lxde.org/en/How_to_write_pl ... or_LXPanel

Hmm, seems to be not very helpful 8-)
But maybe should take a look at the lxpanel sources and then write this tutorial? ;)

nelsonlombardo
Posts: 2
Joined: Fri Jan 21, 2011 5:48 am

Re: Applet programming

Postby nelsonlombardo » Fri Jan 28, 2011 7:33 am

systray icons: http://standards.freedesktop.org/system ... ec/latest/
lxpanel plugins: http://wiki.lxde.org/en/How_to_write_pl ... or_LXPanel

Hmm, seems to be not very helpful 8-)
But maybe should take a look at the lxpanel sources and then write this tutorial? ;)

He is right. Maybe you think this is wasting time, but the better way to help to developers newbies is create documentation based in this type of situations. In my case I don't have experience making applets but if I read something about this...
Regards.

technosaurus
Posts: 7
Joined: Fri Apr 13, 2012 5:11 am

Re: Applet programming

Postby technosaurus » Fri Apr 13, 2012 5:30 am

I recently developed the simplest (but still full featured) tray applet program I could and released it to the public domain (or any license approved by the open source initiative for locales that do not recognize releasing copyright to the public domain)

The whole thing is designed for tray applet development and really simple - it simply displays whatever icon(s) you tell and you can specify the refresh interval, tooltip (mouse-over text) and output for right and left mouse clicks for each icon (this can be used to pull up a controlling program like Xdialog, gtkdialog, zenity, yad, etc ... ).

Feel free to fork it for LXDE if you want, it does everything I wanted it to already (allow me to run all my tray applets with a single shell daemon) so I won't exactly be "maintaining" it except to make it build on later versions of gtk if it breaks.

HTH
http://www.murga-linux.com/puppy/viewtopic.php?t=76431

rockdoctor
Posts: 116
Joined: Tue Nov 11, 2008 4:51 pm

Re: Applet programming

Postby rockdoctor » Sat Apr 28, 2012 7:25 pm

For those who perfer Python over C, I offer the code below:

Code: Select all

#!/bin/env python

"""
sit.py - a translation of technosaurus's sit.c
translator: RockDoctor
"""

import sys
from gi.repository import Gtk


class SitApp:

  def __init__(self):
    if sys.argv[1][0]=='-' or len(sys.argv)!=6:
      self.write1("Usage:\n"
      "sit interval /pathto/image tooltip left-click-action right-click-action\n");
      sys.exit(1)
    this_prgm,t,si,tooltip,lca,rca = sys.argv
    si = Gtk.StatusIcon.new_from_file(si)
    t = int(t)
    si.set_tooltip_text(tooltip)
    si.connect("activate",self.leftClick,lca)
    si.connect("popup-menu",self.rightClick,rca)

    Gtk.main()

  def write1(self,s):
    print s

  def leftClick(self, status_icon, s):
    self.write1 (s)

  def rightClick(self, status_icon, button, activate_time, s):
    self.write1 (s)
    sys.exit() # temporary way to exit the program

  def refresh (self, si):
    Gtk.StatusIcon.get_from_file(si,Gtk.StatusIcon.get_title(si))

def main(data=None):
    app = SitApp()

if __name__ == '__main__':
    main()
Geology - It's not rocket science, it's rock science!

technosaurus
Posts: 7
Joined: Fri Apr 13, 2012 5:11 am

Re: Applet programming

Postby technosaurus » Wed Jun 13, 2012 9:24 pm

It now uses inotify (via a gdk_input) so that no refresh rate is needed and also executes the left and right click commands directly.
Just start her up and use any external program to modify the icons (SVG is the easiest). Your limit is your imagination

Code: Select all

#include <sys/inotify.h>
#include <gtk/gtk.h>
void leftclick(GtkStatusIcon *si, gpointer s){popen(s,"r");} /* exec s */
void rightclick(GtkStatusIcon *si, guint b,guint a_t, gpointer s){popen(s,"r");}
void refresh(gpointer si, gint fd, GdkInputCondition c){   char buffer[sizeof (struct inotify_event)];
   read( fd, buffer, sizeof(buffer) ); /* we are just clearing it & don't care what event type */
   gtk_status_icon_set_from_file(si,gtk_status_icon_get_title(si));} /* redraws */
int main(int argc, char *argv[]){   GtkStatusIcon *si; int i=1, watch, fd;
gtk_init (&argc, &argv); /* loop through icon, tooltip, click messages */
while (i<argc) {   fd = inotify_init(); /* get file descriptor to write on if image changes */
   si = gtk_status_icon_new_from_file(argv[i]); /* get a status icon widget */
   gtk_status_icon_set_title(si,argv[i]); /* hack to store the image path */
   watch = inotify_add_watch( fd, argv[i++], IN_MODIFY );
   gdk_input_add( fd, GDK_INPUT_READ, refresh, si ); /* inotify fd is ready for reading, refresh */
   gtk_status_icon_set_tooltip_text(si,argv[i++]);
   g_signal_connect(G_OBJECT(si), "activate", G_CALLBACK(leftclick),(gpointer) argv[i++]);
   g_signal_connect(G_OBJECT(si), "popup-menu", G_CALLBACK(rightclick), (gpointer) argv[i++]);}
gtk_main ();}


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