problem with key binding for touch devices

[ddaemen]

Hello, i have following code:

import e32
import key_codes
import appuifw
import graphics
import sysinfo

def cb_quit():
	app_lock.signal()

def key_handler(i):
	print("Key: EKey" + unicode(i))

appuifw.app.screen = 'full'
appuifw.app.exit_key_handler = cb_quit

canvas = appuifw.Canvas()
appuifw.app.body = canvas

if appuifw.touch_enabled():
	res_x, res_y = sysinfo.display_pixels()
	res_x = res_x / 3
	res_y = res_y / 3
	canvas.rectangle((0, 0, res_x-1, res_y-1), 0x000000, fill = 0x000000)
	canvas.bind(key_codes.EButton1Down, lambda: key_handler(1), ((0,0), (res_x-1,res_y-1)))

canvas.bind(key_codes.EKey1, lambda: key_handler(1))

app_lock = e32.Ao_lock()
app_lock.wait()

When i press key 1, it does print "Key: EKey1".
When i touch the screen, i get following error:

TypeError: <lambda>() takes no arguments (1 given)

do i something wrong?

[JOM]

Hello, i have following code:

	canvas.bind(key_codes.EButton1Down, lambda: key_handler(1), ((0,0), (res_x-1,res_y-1)))

When i press key 1, it does print "Key: EKey1".
When i touch the screen, i get following error:

TypeError: <lambda>() takes no arguments (1 given)

do i something wrong?

Your code is wrong, just like error note said. Check parentheses and try to fix it... Sorry cannot propose any fix, since I don't quite understand what you're doing (late evening here)

Cheers,

--jouni

[ddaemen]

Your code is wrong, just like error note said. Check parentheses and try to fix it... Sorry cannot propose any fix, since I don't quite understand what you're doing (late evening here)

Cheers,

--jouni

is the code wrong? i have this piece of code from this site:

http://wiki.forum.nokia.com/index.ph...nts_with_PyS60

and i just looked @ it again. and it seems that my code is correct?

[ashwinurao]

Hello, i have following code:

def key_handler(i):
	print("Key: EKey" + unicode(i))


canvas.bind(key_codes.EButton1Down, lambda: key_handler(1), ((0,0), (res_x-1,res_y-1)))

canvas.bind(key_codes.EKey1, lambda: key_handler(1))

When i press key 1, it does print "Key: EKey1".
When i touch the screen, i get following error:

TypeError: <lambda>() takes no arguments (1 given)

do i something wrong?

For Pointer events the callback function will receive a tuple of x, y co-ordinates indicating where the touch event occurred. This is not the case with Key events, so it is better not to handle the two types of events in a single callback function.

Passing arguments to the callback functions registered for touch events is not possible right now because the callback function receives the co-ordinates.

[ddaemen]

well i solved my problem with following code:

import e32
import key_codes
import appuifw
import graphics
import sysinfo

def cb_quit():
	app_lock.signal()

def key_handler1(pos=(0,0)):
	print("Key: EKey1")

def key_handler2(pos=(0,0)):
	print("Key: EKey2")

def key_handler3(pos=(0,0)):
	print("Key: EKey3")
#and more till 8 buttons

appuifw.app.screen = 'full'
appuifw.app.exit_key_handler = cb_quit

canvas = appuifw.Canvas()
appuifw.app.body = canvas

if appuifw.touch_enabled():
	res_x, res_y = sysinfo.display_pixels()
	res_x = res_x / 3
	res_y = res_y / 3
	canvas.rectangle((0, 0, res_x-1, res_y-1), 0x000000, fill = 0x000000)
	canvas.bind(key_codes.EButton1Down, key_handler1, ((0,0), (res_x-1,res_y-1)))
	canvas.bind(key_codes.EButton1Down, key_handler2, ((res_x,0), (res_x*2-1,res_y-1)))
	canvas.bind(key_codes.EButton1Down, key_handler3, ((res_x*2,0), (res_x*3,res_y-1)))
	#and more till 8 buttons

canvas.bind(key_codes.EKey1, lambda: key_handler1)
canvas.bind(key_codes.EKey2, lambda: key_handler2)
canvas.bind(key_codes.EKey3, lambda: key_handler3)
#and more till 8 buttons

app_lock = e32.Ao_lock()
app_lock.wait()

[marcelobarrosalmeida]

Hi

A little bit later but ... How about to use a parameter in lambda function to put your first version to work (if you still want, course):

def handler(pos=(0,0),id=-1):
    if id == 0:
        print "event 0"
    elif id == 1:
        print "event 1"
    ...
    else:
        pass # invalid id here, treat it

# change id below
# id = 1
canvas.bind(key_codes.EButton1Down, lambda x: key_handler(x,1), ((0,0), (res_x-1,res_y-1)))

But, take care, "it is better not to handle the two types of events in a single callback function." (ashwinurao)