User:Walter/favoriteslayout.py
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Revision as of 23:50, 9 September 2008 by Walter (talk | contribs) (User:Walter/favoritelayout.py moved to User:Walter/favoriteslayout.py)
# Copyright (C) 2008 One Laptop Per Child
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import logging
import math
import hashlib
import gobject
import gtk
import hippo
from sugar.graphics import style
from sugar import activity
from view.home.grid import Grid
_logger = logging.getLogger('FavoritesLayout')
_CELL_SIZE = 4
_BASE_SCALE = 1000
class FavoritesLayout(gobject.GObject, hippo.CanvasLayout):
__gtype_name__ = 'FavoritesLayout'
def __init__(self):
gobject.GObject.__init__(self)
self.box = None
self.fixed_positions = {}
def do_set_box(self, box):
self.box = box
def do_get_height_request(self, for_width):
return 0, gtk.gdk.screen_height() - style.GRID_CELL_SIZE
def do_get_width_request(self):
return 0, gtk.gdk.screen_width()
def compare_activities(self, icon_a, icon_b):
return 0
def append(self, icon, locked=False):
self.box.insert_sorted(icon, 0, self.compare_activities)
if hasattr(icon, 'fixed_position'):
relative_x, relative_y = icon.fixed_position
if relative_x >= 0 and relative_y >= 0:
min_width_, width = self.box.get_width_request()
min_height_, height = self.box.get_height_request(width)
self.fixed_positions[icon] = \
(int(relative_x * _BASE_SCALE / float(width)),
int(relative_y * _BASE_SCALE / float(height)))
def remove(self, icon):
if icon in self.fixed_positions:
del self.fixed_positions[icon]
self.box.remove(icon)
def move_icon(self, icon, x, y, locked=False):
if icon not in self.box.get_children():
raise ValueError('Child not in box.')
if hasattr(icon, 'get_bundle_id') and hasattr(icon, 'get_version'):
min_width_, width = self.box.get_width_request()
min_height_, height = self.box.get_height_request(width)
registry = activity.get_registry()
registry.set_activity_position(
icon.get_bundle_id(), icon.get_version(),
x * width / float(_BASE_SCALE),
y * height / float(_BASE_SCALE))
self.fixed_positions[icon] = (x, y)
def do_allocate(self, x, y, width, height, req_width, req_height,
origin_changed):
raise NotImplementedError()
def allow_dnd(self):
return False
class RandomLayout(FavoritesLayout):
__gtype_name__ = 'RandomLayout'
def __init__(self):
FavoritesLayout.__init__(self)
min_width_, width = self.do_get_width_request()
min_height_, height = self.do_get_height_request(width)
self._grid = Grid(width / _CELL_SIZE, height / _CELL_SIZE)
self._grid.connect('child-changed', self.__grid_child_changed_cb)
def __grid_child_changed_cb(self, grid, child):
child.emit_request_changed()
def append(self, icon, locked=False):
FavoritesLayout.append(self, icon, locked)
min_width_, child_width = icon.get_width_request()
min_height_, child_height = icon.get_height_request(child_width)
min_width_, width = self.box.get_width_request()
min_height_, height = self.box.get_height_request(width)
if icon in self.fixed_positions:
x, y = self.fixed_positions[icon]
x = min(x, width - child_width)
y = min(y, height - child_height)
elif hasattr(icon, 'get_bundle_id'):
name_hash = hashlib.md5(icon.get_bundle_id())
x = int(name_hash.hexdigest()[:5], 16) % (width - child_width)
y = int(name_hash.hexdigest()[-5:], 16) % (height - child_height)
else:
x = None
y = None
if x is None or y is None:
self._grid.add(icon,
child_width / _CELL_SIZE, child_height / _CELL_SIZE)
else:
self._grid.add(icon,
child_width / _CELL_SIZE, child_height / _CELL_SIZE,
x / _CELL_SIZE, y / _CELL_SIZE)
def remove(self, icon):
self._grid.remove(icon)
FavoritesLayout.remove(self, icon)
def move_icon(self, icon, x, y, locked=False):
self._grid.move(icon, x / _CELL_SIZE, y / _CELL_SIZE, locked)
FavoritesLayout.move_icon(self, icon, x, y, locked)
def do_allocate(self, x, y, width, height, req_width, req_height,
origin_changed):
for child in self.box.get_layout_children():
# We need to always get requests to not confuse hippo
min_w_, child_width = child.get_width_request()
min_h_, child_height = child.get_height_request(child_width)
rect = self._grid.get_child_rect(child.item)
child.allocate(rect.x * _CELL_SIZE,
rect.y * _CELL_SIZE,
child_width,
child_height,
origin_changed)
def allow_dnd(self):
return True
_MINIMUM_RADIUS = style.XLARGE_ICON_SIZE / 2 + style.DEFAULT_SPACING + \
style.STANDARD_ICON_SIZE * 2
_MAXIMUM_RADIUS = (gtk.gdk.screen_height() - style.GRID_CELL_SIZE) / 2 - \
style.STANDARD_ICON_SIZE - style.DEFAULT_SPACING
class RingLayout(FavoritesLayout):
__gtype_name__ = 'RingLayout'
def __init__(self):
FavoritesLayout.__init__(self)
self._locked_children = {}
def append(self, icon, locked=False):
FavoritesLayout.append(self, icon, locked)
if locked:
child = self.box.find_box_child(icon)
self._locked_children[child] = (0, 0)
def remove(self, icon):
child = self.box.find_box_child(icon)
if child in self._locked_children:
del self._locked_children[child]
FavoritesLayout.remove(self, icon)
def move_icon(self, icon, x, y, locked=False):
FavoritesLayout.move_icon(self, icon, x, y, locked)
if locked:
child = self.box.find_box_child(icon)
self._locked_children[child] = (x, y)
def _calculate_radius_and_icon_size(self, children_count):
angle = 2 * math.pi / children_count
# what's the radius required without downscaling?
distance = style.STANDARD_ICON_SIZE + style.DEFAULT_SPACING
icon_size = style.STANDARD_ICON_SIZE
if children_count == 1:
radius = 0
else:
radius = math.sqrt(distance ** 2 /
(math.sin(angle) ** 2 + (math.cos(angle) - 1) ** 2))
if radius < _MINIMUM_RADIUS:
# we can upscale, if we want
icon_size += style.STANDARD_ICON_SIZE * \
(0.5 * (_MINIMUM_RADIUS - radius) / _MINIMUM_RADIUS)
radius = _MINIMUM_RADIUS
elif radius > _MAXIMUM_RADIUS:
radius = _MAXIMUM_RADIUS
# need to downscale. what's the icon size required?
distance = math.sqrt((radius * math.sin(angle)) ** 2 + \
(radius * (math.cos(angle) - 1)) ** 2)
icon_size = distance - style.DEFAULT_SPACING
return radius, icon_size
def _calculate_position(self, radius, icon_size, index, children_count):
width, height = self.box.get_allocation()
# angle decreases as the radius increases
inc = 12.0 + index / 6.0
angle = index * (2 * math.pi / inc) - math.pi / 2
# radius is proportional to index/children_count
myminimum = _MINIMUM_RADIUS * .667
newradius = ((radius - myminimum) * (index * 1.1) / children_count) +
myminimum
x = newradius * math.cos(angle) + (width - icon_size) / 2
y = newradius * math.sin(angle) + (height - icon_size -
style.GRID_CELL_SIZE) / 2
return x, y
def _get_children_in_ring(self):
children_in_ring = [child for child in self.box.get_layout_children() \
if child not in self._locked_children]
return children_in_ring
def _update_icon_sizes(self):
children_in_ring = self._get_children_in_ring()
radius_, icon_size = \
self._calculate_radius_and_icon_size(len(children_in_ring))
for child in children_in_ring:
child.item.props.size = icon_size
def do_allocate(self, x, y, width, height, req_width, req_height,
origin_changed):
children_in_ring = self._get_children_in_ring()
if children_in_ring:
radius, icon_size = \
self._calculate_radius_and_icon_size(len(children_in_ring))
for n in range(len(children_in_ring)):
child = children_in_ring[n]
x, y = self._calculate_position(radius, icon_size, n,
len(children_in_ring))
# We need to always get requests to not confuse hippo
min_w_, child_width = child.get_width_request()
min_h_, child_height = child.get_height_request(child_width)
child.allocate(int(x), int(y), child_width, child_height,
origin_changed)
# decrease the radius slightly with each icon
radius -= 6;
for child in self._locked_children.keys():
x, y = self._locked_children[child]
# We need to always get requests to not confuse hippo
min_w_, child_width = child.get_width_request()
min_h_, child_height = child.get_height_request(child_width)
child.allocate(int(x), int(y), child_width, child_height,
origin_changed)
def compare_activities(self, icon_a, icon_b):
if hasattr(icon_a, 'installation_time') and \
hasattr(icon_b, 'installation_time'):
return icon_b.installation_time - icon_a.installation_time
else:
return 0