/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/PositionEntry.py is in lightdm-gtk-greeter-settings 1.2.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# LightDM GTK Greeter Settings
# Copyright (C) 2014 Andrew P. <pan.pav.7c5@gmail.com>
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3, as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
# PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
from itertools import product
from gi.repository import (
Gdk,
Gtk)
from lightdm_gtk_greeter_settings.helpers import WidgetsWrapper
from lightdm_gtk_greeter_settings.OptionEntry import BaseEntry
__all__ = ['PositionEntry']
class PositionEntry(BaseEntry):
class Dimension:
def __init__(self, widgets, on_changed):
self._entry = widgets['entry']
self._percents = widgets['percents']
self._mirror = widgets['mirror']
self._adjustment = widgets['adjustment']
self._on_changed = on_changed
self._anchor = None
self._on_percents_id = self._percents.connect('toggled', self._on_percents_toggled)
self._on_mirror_id = self._mirror.connect('toggled', self._on_mirror_toggled)
self._on_value_id = self._adjustment.connect('value-changed', self._on_value_changed)
@property
def value(self):
return '%s%d%s,%s' % ('-' if self._mirror.props.active else '',
int(self._entry.props.value),
'%' if self._percents.props.active else '',
self._anchor)
@value.setter
def value(self, s):
if isinstance(s, tuple):
p, percents, negative, anchor = s
else:
value, __, anchor = s.partition(',')
percents = value and value[-1] == '%'
if percents:
value = value[:-1]
try:
p = int(value)
except ValueError:
p = 0
negative = (p < 0) or (p == 0 and value and value[0] == '-')
if not anchor or anchor not in ('start', 'center', 'end'):
if negative:
anchor = 'end'
else:
anchor = 'start'
self._anchor = anchor
with self._percents.handler_block(self._on_percents_id):
self._percents.props.active = percents
self._adjustment.props.upper = 100 if self._percents.props.active else 10000
with self._mirror.handler_block(self._on_mirror_id):
self._mirror.props.active = negative
with self._adjustment.handler_block(self._on_value_id):
self._adjustment.props.value = -p if negative else p
@property
def anchor(self):
return self._anchor
@anchor.setter
def anchor(self, value):
self._anchor = value
@property
def negative(self):
return self._mirror.props.active
@negative.setter
def negative(self, value):
self._mirror.props.active = value
def get_value_for_screen(self, screen: int):
p = int(self._adjustment.props.value)
if self._percents.props.active:
p = screen * p / 100
if self._mirror.props.active:
p = screen - p
return int(p)
def _on_percents_toggled(self, toggle):
self._adjustment.props.upper = 100 if toggle.props.active else 10000
self._on_changed(self)
def _on_mirror_toggled(self, toggle):
self._on_changed(self)
def _on_value_changed(self, widget):
self._on_changed(self)
AssumedWindowSize = 430, 240
def __init__(self, widgets):
super().__init__(widgets)
self._screen_size = None
self._last_overlay_size = None
self._last_window_allocation = None
self._screen_frame = widgets['screen_frame']
self._screen_overlay = widgets['screen_overlay']
window_box = widgets['window_box']
grid = widgets['window_grid']
self._motion = False
window_box.connect('motion-notify-event', self._on_window_motion)
window_box.connect('button-press-event', self._on_window_button_press)
window_box.connect('button-release-event', self._on_window_button_release)
# Creating points grid
anchors_align = (Gtk.Align.START, Gtk.Align.CENTER, Gtk.Align.END)
anchors = [(x, y, Gtk.RadioButton())
for x, y in product(enumerate(('start', 'center', 'end')), repeat=2)]
self._anchors = {}
self._anchors_handlers = {}
for (left, x_anchor), (top, y_anchor), w in anchors:
w.props.halign = anchors_align[left]
w.props.valign = anchors_align[top]
if w != anchors[0][-1]:
w.props.group = anchors[0][-1]
grid.attach(w, left, top, 1, 1)
self._anchors[x_anchor, y_anchor] = w
self._anchors_handlers[w] = w.connect('toggled', self._on_anchor_toggled,
x_anchor, y_anchor)
grid.show_all()
self._x = PositionEntry.Dimension(WidgetsWrapper(widgets, 'x'), self._on_dimension_changed)
self._y = PositionEntry.Dimension(WidgetsWrapper(widgets, 'y'), self._on_dimension_changed)
self._on_gdk_screen_changed()
self._screen_overlay.connect('get-child-position',
self._on_screen_overlay_get_child_position)
self._screen_overlay.connect('screen-changed', self._on_gdk_screen_changed)
def _get_value(self):
x = self._x.value
y = self._y.value
return x + ' ' + y if x != y else x
def _set_value(self, value):
self._last_window_allocation = None
if value:
x, __, y = value.partition(' ')
self._x.value = x
self._y.value = y or x
anchor = self._anchors[self._x.anchor, self._y.anchor]
with anchor.handler_block(self._anchors_handlers[anchor]):
anchor.props.active = True
self._screen_overlay.queue_resize()
self._emit_changed()
def _get_corrected_position(self, p, screen, window, anchor):
if anchor == 'center':
p -= window / 2
elif anchor == 'end':
p -= window
if p + window > screen:
p = screen - window
if p < 0:
p = 0
return int(p)
def _on_dimension_changed(self, dimension):
self._last_window_allocation = None
self._screen_overlay.queue_resize()
self._emit_changed()
def _on_screen_overlay_get_child_position(self, overlay, child, allocation):
screen = overlay.get_allocation()
if self._last_window_allocation and \
self._last_overlay_size == (screen.width, screen.height):
(allocation.x, allocation.y,
allocation.width, allocation.height) = self._last_window_allocation
return True
self._last_overlay_size = screen.width, screen.height
scale = screen.width / self._screen_size[0]
width = int(self.AssumedWindowSize[0] * scale)
height = int(self.AssumedWindowSize[1] * scale)
# Set desired size
child.set_size_request(width, height)
# And check what actually we have now
width, height = child.size_request().width, child.size_request().height
x = int(self._x.get_value_for_screen(self._screen_size[0]) * scale)
y = int(self._y.get_value_for_screen(self._screen_size[1]) * scale)
x = self._get_corrected_position(x, screen.width, width, self._x.anchor)
y = self._get_corrected_position(y, screen.height, height, self._y.anchor)
self._last_window_allocation = x, y, width, height
allocation.x, allocation.y, allocation.width, allocation.height = x, y, width, height
return True
def _on_anchor_toggled(self, toggle, x, y):
if not toggle.props.active:
return
self._x.anchor = x
self._y.anchor = y
self._last_window_allocation = None
self._screen_overlay.queue_resize()
self._emit_changed()
def _on_gdk_screen_changed(self, widget=None, prev_screen=None):
screen = self._screen_overlay.get_toplevel().get_screen()
geometry = screen.get_monitor_geometry(screen.get_primary_monitor())
self._screen_size = geometry.width, geometry.height
self._screen_frame.props.ratio = geometry.width / geometry.height
def _on_window_motion(self, widget, event):
if not event.state & Gdk.ModifierType.BUTTON1_MASK:
return False
screen = self._screen_overlay.get_allocation()
x, y = widget.translate_coordinates(self._screen_overlay, event.x, event.y)
for d, p in ((self._x, int(100 * x / screen.width)),
(self._y, int(100 * y / screen.height))):
if p < 0:
p = 0
elif p > 100:
p = 100
if d.negative:
d.value = p - 100, True, True, d.anchor
else:
d.value = p, True, False, d.anchor
self._motion = True
self._last_window_allocation = None
self._screen_overlay.queue_resize()
return True
def _on_window_button_press(self, widget, event):
if event.button == 1:
self._motion = False
def _on_window_button_release(self, widget, event):
if self._motion and event.button == 1:
self._motion = False
self._emit_changed()
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