canvas.bind() doubt

[DionisioM]

Hi everybody

I wander if u guys could help me out, i have the following line of code:

canvas.bind(key_codes.EButton1Down,Movimento.mouse_down( down_y, up_y, left_x, right_x, source_novo_x, source_novo_y,bt,canvas, pos=(0, 0)))

where mouse_down is the function that is executed then a touch occurs but now i need for the function to return some parameters my problem now is how to access that parameters.

I did the following:

down= canvas.bind(key_codes.EButton1Down,Movimento.mouse_down( down_y, up_y, left_x, right_x, source_novo_x, source_novo_y,bt,canvas, pos=(0, 0)))

and got the following error: TypeError:callable expected

Can anybody help me out on how to acess the return parametes correctly

Thanks for ur attention !!

[bogdan.galiceanu]

Hi,

One way to do it is to have global variables in which your function will store the values it's supposed to return.

For example:

def f():
    return 5

a = f()

becomes

a = 0

def f():
    global a
    a = 5

[DionisioM]

Thank you for you replay

but my problem is that i have them in different .py files :S

i have the main.py where i have that line of code and from there i call the mousse_down that is on Movimento.py and i need to return one value to the main.py file.

my problem because of the nature of the bind() function i think :S

Hi,

One way to do it is to have global variables in which your function will store the values it's supposed to return.

For example:

def f():
    return 5

a = f()

becomes

a = 0

def f():
    global a
    a = 5

[bogdan.galiceanu]

Then perhaps you can do it like this: define another function in main.py that calls Movimento.mouse_down and gives the value returned by it to a global variable. Then you bind that function to the canvas.

#main.py

down = None

def my_callback():
    down = Movimento.mouse_down(down_y, up_y, left_x, right_x, source_novo_x, source_novo_y,bt,canvas, pos=(0, 0))
#Depending on how you use it, you may want to define it as my_callback(down_y, up_y, left_x, right_x, source_novo_x, source_novo_y,bt,canvas, pos=(0, 0)) so you can pass the arguments to mouse_down

canvas.bind(key_codes.EButton1Down, my_callback) #Again, you may want to use my_callback(down_y, up_y, left_x, right_x, source_novo_x, source_novo_y,bt,canvas, pos=(0, 0)), probably as a lambda function.

I hope I understood the situation.

[DionisioM]

ahh yes that a good ideia it should work thankss

Then perhaps you can do it like this: define another function in main.py that calls Movimento.mouse_down and gives the value returned by it to a global variable. Then you bind that function to the canvas.

#main.py

down = None

def my_callback():
    down = Movimento.mouse_down(down_y, up_y, left_x, right_x, source_novo_x, source_novo_y,bt,canvas, pos=(0, 0))
#Depending on how you use it, you may want to define it as my_callback(down_y, up_y, left_x, right_x, source_novo_x, source_novo_y,bt,canvas, pos=(0, 0)) so you can pass the arguments to mouse_down

canvas.bind(key_codes.EButton1Down, my_callback) #Again, you may want to use my_callback(down_y, up_y, left_x, right_x, source_novo_x, source_novo_y,bt,canvas, pos=(0, 0)), probably as a lambda function.

I hope I understood the situation.