Python 3 ThreadPoolExecutor in Gtk 3
So I wanted to collect all the theme icons on my Linux machine so I wrote a little app. It is really fast using the ThreadPoolExecutor from futures. I’ve used this at work but never in a Gtk app. Here’s the result from the straight Python 3 code without a GUI. That’s a lot of images. I didn’t realize there are that many as Icon Browser displays nowhere near that amount.
Here’s the code.
from concurrent.futures import ThreadPoolExecutor
import os
import time
def get_icons():
filter = ['.png','.svg']
base_path = '/usr/share/icons'
for (dirpath, dirnames, filenames) in os.walk(base_path):
if not filenames: continue # If not files found just skip path.
# Filter by extension.
for img in filenames:
if os.path.splitext(img)[-1].strip().lower() not in filter:
continue
img_path = os.path.join(dirpath, img)
yield img_path
if __name__ in '__main__':
start = time.time()
with ThreadPoolExecutor(max_workers=25) as executor:
task = executor.submit(get_icons)
count=0
for img in task.result():
count += 1
print(img)
print('total items: {0} took: {1} seconds'.format(count, time.time() - start))Of course in Gtk you have added overhead but by limiting what I return it ran reasonably well. I might add a second list box to separate each theme, size, and type to reduce the overhead even more so we only load those small lists of icons on click. For this I just want ed to see if it would work as I have only used the thread library for Gtk in the past. Here’s the result.
I filter on 16px icons only. It’s still 5k worth of images. Here’s the code.
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk,GObject,GdkPixbuf
from concurrent.futures import ThreadPoolExecutor
import os
def get_icons():
filter = ['.png']#,'.svg']
base_path = '/usr/share/icons'
for (dirpath, dirnames, filenames) in os.walk(base_path):
if not filenames: continue # If not files found just skip path.
if '16x16' not in dirpath.lower():
continue # limit amount as there are too many to load up.
# Filter by extension.
for img in filenames:
if os.path.splitext(img)[-1].strip().lower() not in filter:
continue
img_path = os.path.join(dirpath, img)
yield img_path
class MyWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="PyCons")
self.set_title("PyCons")
self.set_default_size(800, 450)
self.button = Gtk.Button(label="Fetch Icons")
self.button.connect("clicked",self.fetch)
self.status = Gtk.Label()
self.status.set_text(' Idle')
self.status.set_halign(Gtk.Align.START)
self.vbox = Gtk.VBox()
self.scroller = Gtk.ScrolledWindow()
self.listbox = Gtk.ListBox()
self.imgIcon = Gtk.Image()
self.scroller.add(self.listbox)
self.vbox.pack_start(self.button,False,False,5)
self.vbox.pack_start(self.scroller,True,True,5)
self.vbox.pack_end(self.status,False,False,5)
self.add(self.vbox)
def fetch(self,button):
count=0
with ThreadPoolExecutor(max_workers=25) as executor:
task = executor.submit(get_icons)
for img_path in task.result():
count+=1
pixbuf = pixbuf = GdkPixbuf.Pixbuf.new_from_file_at_size(img_path,16,16)
icon = self.imgIcon.new_from_pixbuf(pixbuf)
name = Gtk.Label()
name.set_text(img_path.split('/')[-1].split('.')[0].strip())
path = Gtk.Label()
path.set_text(img_path)
row = Gtk.ListBoxRow()
hbox = Gtk.HBox()
hbox.pack_start(icon,False,False,10)
hbox.pack_start(name,False,True,10)
hbox.pack_end(path,False,True,1)
row.add(hbox)
self.listbox.insert(row,0)
self.listbox.show_all()
self.status.set_text(' Fetched %s items' % count)
win = MyWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()So there you have it. Two ways to list the theme and system icons and images on your Ubuntu/Debian based system. If you need to do something heavy in a Gtk application this might be a easy solution for you.