Touch Input in Kivy - kivy

Question

I have a simple app with 2 buttons and their attached callback functions. When a button is pressed, I need to get and use the spos info. I'm using the following code
Python:
class HomeScreen(Screen):
print('Start')
port = "COM7"
bluetooth = serial.Serial(port, 9600)
print("Connected to HC-06")
def button_press_down(self, *args):
print("button pressed #location:")
self.bluetooth.write(b"2")
def button_press_up(self, *args):
print("button pressed #location:")
self.bluetooth.write(b"3")
def on_touch_down(self, touch):
print(touch)
def on_touch_move(self, touch):
pass
class SecondScreen(Screen):
pass
class WindowManager(ScreenManager):
pass
kv=Builder.load_file('touch.kv')
class MainApp(App):
def build(self):
return kv
if __name__ == "__main__":
TestApp = MainApp()
TestApp.run()
.kv file:
#:import utils kivy.utils
WindowManager:
HomeScreen:
SecondScreen:
<HomeScreen>:
name: "button press"
FloatLayout:
canvas.before:
Color:
rgb: utils.get_color_from_hex("#ffffff")
Rectangle:
size: self.size
pos: self.pos
GridLayout:
canvas.before:
Color:
rgb: utils.get_color_from_hex("#ffffff")
Rectangle:
size: self.size
pos: self.pos
rows: 1
cols: 2
padding:10
Button:
text: "Button_1"
id:send_data_bluettooh
on_press:
root.button_press_down()
Button:
text: "Button_2"
id:send_data_bluettooh_2
on_press:
root.button_press_up()
<SecondScreen>:
name: "SecondScreen"
I can get the spos by overwriting the "on_touch_down" fct. The problem there is that my fct button_press_down() is no longer called when I press button 1. Is there any way I can use the spos info and still keep the callback function button_press_down() of my button?

Answer 1

You can get the touch.spos by extending the Button class so that it remembers that information. Here is a modified version of your code that does that:
from kivy.app import App
from kivy.lang import Builder
from kivy.properties import ListProperty
from kivy.uix.button import Button
from kivy.uix.screenmanager import Screen, ScreenManager
class MyButt(Button):
last_touch_down = ListProperty([])
last_touch_up = ListProperty([])
def on_touch_down(self, touch):
if self.collide_point(*touch.pos):
self.last_touch_down = touch.spos
return super(MyButt, self).on_touch_down(touch)
def on_touch_up(self, touch):
if self.collide_point(*touch.pos):
self.last_touch_up = touch.spos
return super(MyButt, self).on_touch_up(touch)
class HomeScreen(Screen):
print('Start')
port = "COM7"
bluetooth = serial.Serial(port, 9600)
print("Connected to HC-06")
def button_press_down(self, button):
print("button pressed #location:", button.last_touch_down)
self.bluetooth.write(b"2")
def button_press_up(self, button):
print("button pressed #location:", button.last_touch_down)
self.bluetooth.write(b"3")
# def on_touch_down(self, touch):
# print(touch)
# return super(HomeScreen, self).on_touch_down(touch)
#
# def on_touch_move(self, touch):
# pass
class SecondScreen(Screen):
pass
class WindowManager(ScreenManager):
pass
kv=Builder.load_file('touch.kv')
class MainApp(App):
def build(self):
return kv
if __name__ == "__main__":
TestApp = MainApp()
TestApp.run()
And replacing Button with MyButt in the kv:
#:import utils kivy.utils
WindowManager:
HomeScreen:
SecondScreen:
<HomeScreen>:
name: "button press"
FloatLayout:
canvas.before:
Color:
rgb: utils.get_color_from_hex("#ffffff")
Rectangle:
size: self.size
pos: self.pos
GridLayout:
canvas.before:
Color:
rgb: utils.get_color_from_hex("#ffffff")
Rectangle:
size: self.size
pos: self.pos
rows: 1
cols: 2
padding:10
MyButt:
text: "Button_1"
id:send_data_bluettooh
on_press:
root.button_press_down(self)
MyButt:
text: "Button_2"
id:send_data_bluettooh_2
on_press:
root.button_press_up(self)
<SecondScreen>:
name: "SecondScreen"