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AndroidSlider.py
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AndroidSlider.py
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'''
Created by Willie Lawrence - cptx032 arroba gmail dot com
https://github.com/cptx032/kivy-widgets
'''
from kivy.uix.widget import Widget
from kivy.uix.behaviors import ButtonBehavior
from kivy.graphics import Rectangle, Color, Ellipse
def lerp(a, b, x):
'''linear interpolation'''
return a + ((b-a)*x)
class FilledCircle(Ellipse):
def __init__(self, *args, **kws):
x = kws.pop('x', 0)
y = kws.pop('y', 0)
radius = kws.pop('radius', 0)
Ellipse.__init__(self, *args, **kws)
self.x = x
self.y = y
self.radius = radius
def update(self):
pass
@property
def radius(self):
# supposing the size is a square
# the first (0) element is equals
# to second element
return self.size[0] / 2.0
@radius.setter
def radius(self, value):
# preserving old position
x, y = self.x, self.y
# the anchor of square is the 'sw'
# point, so we we need reposition
# the square
self.size = [value*2, value*2]
# reposition:
self.x, self.y = x, y
self.update()
@property
def x(self):
return self.pos[0] + self.radius
@x.setter
def x(self, value):
pos = list(self.pos)
pos[0] = value - self.radius
self.pos = pos
self.update()
@property
def y(self):
return self.pos[1] + self.radius
@y.setter
def y(self, value):
pos = list(self.pos)
pos[1] = value - self.radius
self.pos = pos
self.update()
class AndroidSliderCenter(FilledCircle):
def __init__(self, *args, **kws):
self.outer_circle = FilledCircle(
x=kws.get('x',0),
y=kws.get('y',0),
radius=15
)
FilledCircle.__init__(self, *args, **kws)
def update(self):
self.outer_circle.x = self.x
self.outer_circle.y = self.y
class AndroidSlider(Widget, ButtonBehavior):
def __init__(self, _min=0, _max=100, value=50):
self.__min = _min
self.__max = _max
self.__value = value
# used here only to save current pos and size
self.widget_area = Rectangle()
self.circle = AndroidSliderCenter(radius=5)
self.bg_line = Rectangle()
self.bg_line_color = Color(0.109,0.109,0.109,1.0)
self.progress_line = Rectangle()
self.bg_height = 3
Widget.__init__(self)
self.canvas.add(self.bg_line_color)
self.canvas.add(self.bg_line)
self.canvas.add(Color(0.18,0.7,0.89,1.0))
self.canvas.add(self.progress_line)
self.canvas.add(Color(0.18,0.7,0.89,1.0))
self.canvas.add(self.circle)
self.canvas.add(Color(0.18,0.7,0.89,0.5))
self.canvas.add(self.circle.outer_circle)
self.min = self.__min
self.max = self.__max
self.value = self.__value
ButtonBehavior.__init__(self)
def mouse_is_over(self, event):
x, y = event.pos
in_x = (x >= self.widget_area.pos[0]) and (x <= self.widget_area.pos[0]+self.widget_area.size[0])
in_y = (y >= self.widget_area.pos[1]) and (y <= self.widget_area.pos[1]+self.widget_area.size[1])
return in_x and in_y
def set_value_by_event(self, event):
x, y = event.pos
self.value = lerp(self.min, self.max, (x - self.widget_area.pos[0]) / self.widget_area.size[0])
def on_touch_move(self, event):
if self.mouse_is_over(event):
self.set_value_by_event(event)
def on_touch_down(self, event):
if self.mouse_is_over(event):
self.set_value_by_event(event)
def on_pos(self, parent, pos):
self.widget_area.pos = pos
self.update_slider()
def on_size(self, parent, size):
self.widget_area.size = size
self.update_slider()
def update_slider(self):
self.bg_line.size = [self.widget_area.size[0], self.bg_height]
self.bg_line.pos = [
self.widget_area.pos[0],
self.widget_area.pos[1]+(self.widget_area.size[1]/2.0)-(self.bg_height/2.0)
]
self.circle.x = lerp(
self.widget_area.pos[0],
self.widget_area.pos[0] + self.widget_area.size[0],
(self.value-self.min) / (self.max-self.min)
)
size = [self.circle.x - self.widget_area.pos[0], self.bg_height]
self.progress_line.size = size
self.circle.y = self.bg_line.pos[1] + self.bg_height/2.0
self.circle.update()
self.progress_line.pos = self.bg_line.pos
@property
def min(self):
return self.__min
@min.setter
def min(self, value):
self.__min = float(value)
self.update_slider()
@property
def max(self):
return self.__max
@max.setter
def max(self, value):
self.__max = float(value)
self.update_slider()
@property
def value(self):
return self.__value
@value.setter
def value(self, value):
# fixme> verify bounds
self.__value = float(value)
self.update_slider()
@property
def bg_height(self):
return self.bg_line.size[1]
@bg_height.setter
def bg_height(self, value):
size = list(self.bg_line.size)
size[1] = value
self.bg_line.size = size
self.update_slider()
if __name__ == '__main__':
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
class SliderApp(App):
def build(self):
grid = GridLayout(rows=1, cols=1, padding=55)
grid.add_widget(AndroidSlider(_min=0, _max=100, value=50))
return grid
SliderApp().run()