Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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# -*- coding: utf-8 -*-
from kivy.animation import Animation
from kivy.clock import Clock
from kivy.core.window import Window
from kivy.lang import Builder
from kivy.garden.recycleview import RecycleView
from kivy.metrics import dp
from kivy.properties import NumericProperty, ListProperty, OptionProperty, \
StringProperty
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.boxlayout import BoxLayout
import kivymd.material_resources as m_res
from kivymd.theming import ThemableBehavior
Builder.load_string('''
#:import STD_INC kivymd.material_resources.STANDARD_INCREMENT
<MDMenuItem>
size_hint_y: None
height: dp(48)
padding: dp(16), 0
on_release: root.parent.parent.parent.parent.dismiss() # Horrible, but hey it works
MDLabel:
text: root.text
theme_text_color: 'Primary'
<MDMenu>
size_hint: None, None
width: root.width_mult * STD_INC
key_viewclass: 'viewclass'
key_size: 'height'
<MDDropdownMenu>
FloatLayout:
id: fl
MDMenu:
id: md_menu
data: root.items
width_mult: root.width_mult
size_hint: None, None
size: 0,0
canvas.before:
Color:
rgba: root.theme_cls.bg_light
Rectangle:
size: self.size
pos: self.pos
''')
class MDMenuItem(ButtonBehavior, BoxLayout):
text = StringProperty()
class MDMenu(RecycleView):
width_mult = NumericProperty(1)
class MDDropdownMenu(ThemableBehavior, BoxLayout):
items = ListProperty()
'''See :attr:`~kivy.garden.recycleview.RecycleView.data`
'''
width_mult = NumericProperty(1)
'''This number multiplied by the standard increment (56dp on mobile,
64dp on desktop, determines the width of the menu items.
If the resulting number were to be too big for the application Window,
the multiplier will be adjusted for the biggest possible one.
'''
max_height = NumericProperty()
'''The menu will grow no bigger than this number.
Set to 0 for no limit. Defaults to 0.
'''
border_margin = NumericProperty(dp(4))
'''Margin between Window border and menu
'''
ver_growth = OptionProperty(None, allownone=True,
options=['up', 'down'])
'''Where the menu will grow vertically to when opening
Set to None to let the widget pick for you. Defaults to None.
'''
hor_growth = OptionProperty(None, allownone=True,
options=['left', 'right'])
'''Where the menu will grow horizontally to when opening
Set to None to let the widget pick for you. Defaults to None.
'''
def open(self, *largs):
Window.add_widget(self)
Clock.schedule_once(lambda x: self.display_menu(largs[0]), -1)
def display_menu(self, caller):
# We need to pick a starting point, see how big we need to be,
# and where to grow to.
c = caller.to_window(caller.center_x,
caller.center_y) # Starting coords
# ---ESTABLISH INITIAL TARGET SIZE ESTIMATE---
target_width = self.width_mult * m_res.STANDARD_INCREMENT
# If we're wider than the Window...
if target_width > Window.width:
# ...reduce our multiplier to max allowed.
target_width = int(
Window.width / m_res.STANDARD_INCREMENT) * m_res.STANDARD_INCREMENT
target_height = sum([dp(48) for i in self.items])
# If we're over max_height...
if 0 < self.max_height < target_height:
target_height = self.max_height
# ---ESTABLISH VERTICAL GROWTH DIRECTION---
if self.ver_growth is not None:
ver_growth = self.ver_growth
else:
# If there's enough space below us:
if target_height <= c[1] - self.border_margin:
ver_growth = 'down'
# if there's enough space above us:
elif target_height < Window.height - c[1] - self.border_margin:
ver_growth = 'up'
# otherwise, let's pick the one with more space and adjust ourselves
else:
# if there's more space below us:
if c[1] >= Window.height - c[1]:
ver_growth = 'down'
target_height = c[1] - self.border_margin
# if there's more space above us:
else:
ver_growth = 'up'
target_height = Window.height - c[1] - self.border_margin
if self.hor_growth is not None:
hor_growth = self.hor_growth
else:
# If there's enough space to the right:
if target_width <= Window.width - c[0] - self.border_margin:
hor_growth = 'right'
# if there's enough space to the left:
elif target_width < c[0] - self.border_margin:
hor_growth = 'left'
# otherwise, let's pick the one with more space and adjust ourselves
else:
# if there's more space to the right:
if Window.width - c[0] >= c[0]:
hor_growth = 'right'
target_width = Window.width - c[0] - self.border_margin
# if there's more space to the left:
else:
hor_growth = 'left'
target_width = c[0] - self.border_margin
if ver_growth == 'down':
tar_y = c[1] - target_height
else: # should always be 'up'
tar_y = c[1]
if hor_growth == 'right':
tar_x = c[0]
else: # should always be 'left'
tar_x = c[0] - target_width
anim = Animation(x=tar_x, y=tar_y,
width=target_width, height=target_height,
duration=.3, transition='out_quint')
menu = self.ids['md_menu']
menu.pos = c
anim.start(menu)
def on_touch_down(self, touch):
if not self.ids['md_menu'].collide_point(*touch.pos):
self.dismiss()
return True
super(MDDropdownMenu, self).on_touch_down(touch)
return True
def on_touch_move(self, touch):
super(MDDropdownMenu, self).on_touch_move(touch)
return True
def on_touch_up(self, touch):
super(MDDropdownMenu, self).on_touch_up(touch)
return True
def dismiss(self):
Window.remove_widget(self)