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→Home View
self.my_orientation += 2 * math.pi / n
self.my_orientation += 2 * math.pi / n
self.my_radius += float(icon_size) / n
self.my_radius += float(icon_size) / n
</code>
This version inherits from RandomLayout and lets you rearrange the icons.
<code>
class MyLayout(RandomLayout):
"""Spiral layout based on Archimedean spiral: r = a + b*theta."""
__gtype_name__ = 'MyLayout'
icon_name = 'view-mylayout'
"""Name of icon used in home view dropdown palette."""
profile_key = 'my-layout'
"""String used in profile to represent this view."""
def __init__(self):
RandomLayout.__init__(self)
self.my_radius = _MINIMUM_RADIUS
self.my_orientation = math.pi
def _calculate_radius_and_icon_size(self, children_count):
"""Stub out this method; not used in `My Layout`."""
return _MINIMUM_RADIUS, style.STANDARD_ICON_SIZE
def _calculate_position(self, icon_size):
""" Increment the radius as you go """
x, y = self._calculate_xy()
# add some buffering around the icon
self._calculate_new_radius_orientation(icon_size + 10)
width, height = self.box.get_allocation()
return int(x) + (width - icon_size) / 2, \
int(y) + (height - icon_size - (style.GRID_CELL_SIZE / 2) ) / 2
def _calculate_xy(self):
""" Convert r, o to x, y """
return -math.sin(self.my_orientation) * self.my_radius, \
math.cos(self.my_orientation) * self.my_radius
def _calculate_new_radius_orientation(self, icon_size):
""" Based upon current radius, calculate new increments """
circumference = self.my_radius * 2 * math.pi
n = circumference / icon_size
self.my_orientation += 2 * math.pi / n
self.my_radius += float(icon_size) / n
def append(self, icon, locked=False):
""" Instead of assigning the position based on a hash, use spiral """
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)
else:
x, y = self._calculate_position(child_width)
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)
</code>
</code>