sugar-toolkit-gtk3/examples/scrollingdetector.py

import os
import time

from gi.repository import Gtk

from sugar3.graphics import style
from sugar3.graphics.icon import CellRendererIcon
from sugar3.graphics.xocolor import XoColor
from sugar3.graphics.scrollingdetector import ScrollingDetector
from sugar3.graphics.palettewindow import TreeViewInvoker
import common


def _scroll_start_cb(event, treeview, invoker):
    print "Scroll starts"
    invoker.detach()

def _scroll_end_cb(event, treeview, invoker):
    print "Scroll ends"
    invoker.attach_treeview(treeview)

test = common.Test()
test.show()

model = Gtk.ListStore(str)

data_dir = os.getenv('GTK_DATA_PREFIX', '/usr/')

iconlist = os.listdir(os.path.join(data_dir,
                      'share/icons/sugar/scalable/actions/'))
print "Displaying %s icons" % len(iconlist)
for icon in iconlist:
    icon = os.path.basename(icon)
    icon = icon[:icon.find('.')]
    model.append([icon])

scrolled = Gtk.ScrolledWindow()
scrolled.set_size_request(800, 800)
treeview = Gtk.TreeView()

treeview.set_model(model)
scrolled.add(treeview)
test.pack_start(scrolled, True, True, 0)
test.show_all()

col = Gtk.TreeViewColumn()
treeview.append_column(col)

xo_color = XoColor('#FF0000,#00FF00')
cell_icon = CellRendererIcon()
cell_icon.props.width = style.GRID_CELL_SIZE
cell_icon.props.height = style.GRID_CELL_SIZE
cell_icon.props.size = style.STANDARD_ICON_SIZE
cell_icon.props.xo_color = xo_color

col.pack_start(cell_icon, expand=False)
col.add_attribute(cell_icon, 'icon-name', 0)
cell_text = Gtk.CellRendererText()
col.pack_start(cell_text, expand=True)
col.add_attribute(cell_text, 'text', 0)

invoker = TreeViewInvoker()
invoker.attach_treeview(treeview)

detector = ScrollingDetector(scrolled)
detector.connect('scroll-start', _scroll_start_cb, treeview, invoker)
detector.connect('scroll-end', _scroll_end_cb, treeview, invoker)

if __name__ == '__main__':
    time_ini = time.time()
    common.main(test)