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sidepanel.py
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'''
Side panel: a panel widget that attach to a side of the screen
'''
__all__ = ('SidePanel', )
from kivy.animation import Animation
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.clock import Clock
from functools import partial
class SidePanel(Widget):
'''A panel widget that attach to a side of the screen
(similar to gnome-panel for linux user).
:Parameters:
`align` : str, default to 'center'
Alignement on the side. Can be one of
'left', 'right', 'top', 'bottom', 'center', 'middle'.
For information, left-bottom, center-middle, right-top have the
same meaning.
`corner` : Widget object, default to None
Corner object to use for pulling in/out the layout. If None
is provided, the default will be a Button() with appropriate
text label (depend of side)
`corner_size` : int, default to 30
Size of the corner, can be the width or height, it depend of side.
`duration` : float, default to 0.5
Animation duration for pull in/out
`hide` : bool, default to True
If true, the widget will be hide by default, otherwise,
the panel is showed
`layout` : AbstractLayout object, default to None
Layout to use inside corner widget. If None is provided,
the default will be a BoxLayout() with default parameters
`side` : str, default to 'left'
Side to attach the widget. Can be one of
'left', 'right', 'top', 'bottom'.
'''
def __init__(self, **kwargs):
kwargs.setdefault('hide', True)
super(SidePanel, self).__init__(**kwargs)
self.side = kwargs.get('side', 'left')
self.align = kwargs.get('align', 'center')
self.corner_size = kwargs.get('corner_size', 30)
self.duration = kwargs.get('duration', .5)
self.relIndex = kwargs.get('relative', 0)
layout = kwargs.get('layout', None)
corner = kwargs.get('corner', None)
assert(self.side in ('bottom', 'top', 'left', 'right'))
assert(self.align in ('bottom', 'top', 'left', 'right', 'middle', 'center'))
if layout is None:
from kivy.uix.boxlayout import BoxLayout
layout = BoxLayout()
self.layout = layout
super(SidePanel, self).add_widget(layout)
if corner is None:
if self.side == 'right':
label = '<'
elif self.side == 'left':
label = '>'
elif self.side == 'top':
label = 'v'
elif self.side == 'bottom':
label = '^'
self.corner = Button(text=label)
else:
self.corner = Button()
self.corner.texture = corner.texture
self.corner.texture_size = corner.texture_size
self.corner.size = corner.texture_size[0]+6, corner.texture_size[1]+6
self.corner_size = None
if corner:
super(SidePanel, self).add_widget(self.corner)
self.corner.bind(on_press = self._corner_on_press)
self.initial_pos = self.pos
self.need_reposition = True
if kwargs.get('hide'):
self.visible = False
self.hide()
Clock.schedule_once(self.update, .1)
def add_widget(self, widget):
self.layout.add_widget(widget)
self.update()
def remove_widget(self, widget):
self.layout.remove_widget(widget)
self.update()
def _corner_on_press(self, *largs):
if self.visible:
self.hide()
else:
self.show()
return True
def _get_position_for(self, visible):
# get position for a specific state (visible or not visible)
w = self.get_parent_window()
if not w:
return
side = self.side
x = self.layout.x
y = self.layout.y
if visible:
if side == 'right':
x = w.width - self.layout.width
elif side == 'top':
y = w.height - self.layout.height
elif side == 'left':
x = 0
elif side == 'bottom':
y = 0
else:
if side == 'left':
x, y = (-self.layout.width, y)
elif side == 'right':
x, y = (w.width, y)
elif side == 'top':
x, y = (x, w.height)
elif side == 'bottom':
x, y = (x, -self.layout.height)
return x, y
def _get_corner_position_for(self, visible):
# adjust size + configure position
w = self.get_parent_window()
if not w:
return
side = self.side
align = self.align
cw, ch = self.corner.size
dx, dy = self._get_position_for(visible)
if side in ('left', 'right'):
if self.corner_size is not None:
self.corner.size = (self.corner_size, self.layout.height)
if align in ('bottom', 'left'):
cy = ly = 0
elif align in ('top', 'right'):
ly = w.height - self.layout.height
cy = w.height - ch
elif align in ('center', 'middle'):
ly = w.center[1] - self.layout.height / 2.
cy = w.center[1] - ch / 2.
self.layout.y = ly
elif side in ('top', 'bottom'):
if self.corner_size is not None:
self.corner.size = (self.layout.width, self.corner_size)
if align in ('bottom', 'left'):
cx = lx = 0
elif align in ('top', 'right'):
lx = w.width - self.layout.width
cx = w.width - cw
elif align in ('center', 'middle'):
lx = w.center[0] - self.layout.width / 2.
cx = w.center[0] - cw / 2.
self.layout.x = lx
if side == 'left':
cx = dx + self.layout.width
cy = cy + self.corner.height * self.relIndex
elif side == 'right':
cx = dx - self.corner.width
cy = cy + self.corner.height * self.relIndex
elif side == 'top':
cy = dy - self.corner.height
elif side == 'bottom':
cy = dy + self.layout.height
return cx,cy
def show(self, *largs):
dpos = self._get_position_for(visible=True)
cpos = self._get_corner_position_for(visible=True)
# bring to front on activation
parent = self.parent
parent.remove_widget(self)
parent.add_widget(self)
self.visible = True
Animation(d=self.duration, t='out_cubic', pos=dpos).start(self.layout)
Animation(d=self.duration, t='out_cubic', pos=cpos).start(self.corner)
def _on_animation_complete_hide(self, *largs):
self.visible = False
def hide(self, *largs):
dpos = self._get_position_for(visible=False)
cpos = self._get_corner_position_for(visible=False)
if dpos is None:
return
anim = Animation(d=self.duration, t='out_cubic', pos=dpos)
anim.bind(on_complete=self._on_animation_complete_hide)
anim.start(self.layout)
Animation(d=self.duration, t='out_cubic', pos=cpos).start(self.corner)
def place(self, noop=None):
self.need_reposition = True
self.update(noop)
def update(self, noop=None):
w = self.get_parent_window()
side = self.side
align = self.align
# first execution, need to place layout in the good size
if self.need_reposition:
dpos = self._get_position_for(self.visible)
if dpos is not None:
self.layout.pos = dpos
self.corner.pos = self._get_corner_position_for(self.visible)
self.need_reposition = False
if self.visible:
self.show()
else:
self.hide()
else:
return
def on_move(self, x, y):
self.initial_pos = x, y
self.layout.pos = x, y
def on_touch_down(self, touch):
if self.corner.on_touch_down(touch):
return True
return super(SidePanel, self).on_touch_down(touch)
def on_touch_move(self, touch):
if self.corner.on_touch_move(touch):
return True
return super(SidePanel, self).on_touch_move(touch)
def on_touch_up(self, touch):
if self.corner.on_touch_up(touch):
return True
return super(SidePanel, self).on_touch_up(touch)