SHAIKH TAUSEEF HUSSAIN
12 years ago
Uwid code below creates a layout and displays some text in the layout. Next
the layout is displayed on the console screen using raw display module from
urwid library. (More info on my complete project can be gleaned from
questions at [widget advice for a console project](
http://stackoverflow.com/questions/17846930/required-widgets-for-displaying-a-1d-console-application)
and [urwid for a console project](
http://stackoverflow.com/questions/17381319/using-urwid-to-create-a-2d-console-application).
My skype help request being [here](
http://stackoverflow.com/questions/17846113/widget-to-choose-for-1d-urwid-application).)
However running the code fails as an AttributeError is raised as described
below. On looking at source code for urwid at
/usr/lib64/python2.7/site-packages/urwid I see that both main_loop.py and
curses_display.py have a draw_screen function with different arguments :
main_loop.py -> def draw_screen(self):
curses_display.py > def draw_screen(self, (cols, rows), r ):
Do I have to specify which one to use by something like **import
draw_screen from specificFile** command ? Or is there anything
fundamentally wrong I am looking at the canvas concept ? I can also see
that the frame class (**class Frame(BoxWidget):** ) in the file
/usr/lib64/python2.7/site-packages/urwid/**container.py** has a render
function (**def render(self, size, focus=False):**)
Error on running code is :
`
Traceback (most recent call last):
File "./yamlUrwidUIPhase6.py", line 104, in <module>
main()
File "./yamlUrwidUIPhase6.py", line 98, in main
form.main()
File "./yamlUrwidUIPhase6.py", line 51, in main
self.loop.run()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line
274, in run
self.screen.run_wrapper(self._run)
File "/usr/lib64/python2.7/site-packages/urwid/raw_display.py", line
237, in run_wrapper
return fn()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line
285, in _run
self.draw_screen()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line
508, in draw_screen
canvas = self._topmost_widget.render(self.screen_size, focus=True)
AttributeError: 'NoneType' object has no attribute 'render'
`
The code :
import sys
sys.path.append('./lib')
import os
from pprint import pprint
import random
import urwid
ui=urwid.raw_display.Screen()
class FormDisplay(object):
def __init__(self):
global ui
self.ui = ui
self.palette = self.ui.register_palette([
('Field', 'dark green, bold', 'black'), # information
fields, Search: etc.
('Info', 'dark green', 'black'), # information in fields
('Bg', 'black', 'black'), # screen background
('InfoFooterText', 'white', 'dark blue'), # footer text
('InfoFooterHotkey', 'dark cyan, bold', 'dark blue'), #
hotkeys in footer text
('InfoFooter', 'black', 'dark blue'), # footer background
('InfoHeaderText', 'white, bold', 'dark blue'), # header
text
('InfoHeader', 'black', 'dark blue'), # header background
('BigText', RandomColor(), 'black'), # main menu banner text
('GeneralInfo', 'brown', 'black'), # main menu text
('LastModifiedField', 'dark cyan, bold', 'black'), # Last
modified:
('LastModifiedDate', 'dark cyan', 'black'), # info in Last
modified:
('PopupMessageText', 'black', 'dark cyan'), # popup message
text
('PopupMessageBg', 'black', 'dark cyan'), # popup message
background
('SearchBoxHeaderText', 'light gray, bold', 'dark cyan'), #
field names in the search box
('SearchBoxHeaderBg', 'black', 'dark cyan'), # field name
background in the search box
('OnFocusBg', 'white', 'dark magenta') # background when a
widget is focused
])
urwid.set_encoding('utf8')
def main(self):
global ui
#self.view = ui.run_wrapper(formLayout)
self.ui.start()
self.view = formLayout()
self.loop = urwid.MainLoop(self.view, self.palette,
unhandled_input=self.unhandled_input)
self.loop.run()
def unhandled_input(self, key):
if key == 'f8':
quit()
return
def formLayout():
global ui
text1 = urwid.Text("Urwid 3DS Application program - F8 exits.")
text2 = urwid.Text("One mission accomplished")
textH = urwid.Text("topmost Pile text")
cols = urwid.Columns([text1,text2])
pile = urwid.Pile([textH,cols])
fill = urwid.Filler(pile)
textT = urwid.Text("Display")
textSH = urwid.Text("Pile text in Frame")
textF = urwid.Text("Good progress !")
frame =
urwid.Frame(fill,header=urwid.Pile([textT,textSH]),footer=textF)
dim = ui.get_cols_rows()
#ui is treated as global handle for all functions, either belonging
#to any class or standalone functions such as formLayout
#need to check if screen has been started
if not ui._started:
print("Screen has not been started, so no use of rendering.Thus
return :-( ")
return
ui.draw_screen(dim, frame.render(dim, True))
return
def RandomColor():
'''Pick a random color for the main menu text'''
listOfColors = ['dark red', 'dark green', 'brown', 'dark blue',
'dark magenta', 'dark cyan', 'light gray',
'dark gray', 'light red', 'light green', 'yellow',
'light blue', 'light magenta', 'light cyan',
'default']
color = listOfColors[random.randint(0, 14)]
return color
def main():
form = FormDisplay()
form.main()
########################################
##### MAIN ENTRY POINT
########################################
if __name__ == '__main__':
main()
I don't want to change the function formLayout as I intend to add more to
this basic code framework, where in another function will be added that
repeatedly calls formLayout to keep updating the screen based on reading
values from a yml file. I already have a separate code that deals with
reading the yaml file and extracting ordered dictionaries out it. After
figuring out how to get basic urwid console working, I can move on to
integrating both to create my final application.
regards
Tauseef
the layout is displayed on the console screen using raw display module from
urwid library. (More info on my complete project can be gleaned from
questions at [widget advice for a console project](
http://stackoverflow.com/questions/17846930/required-widgets-for-displaying-a-1d-console-application)
and [urwid for a console project](
http://stackoverflow.com/questions/17381319/using-urwid-to-create-a-2d-console-application).
My skype help request being [here](
http://stackoverflow.com/questions/17846113/widget-to-choose-for-1d-urwid-application).)
However running the code fails as an AttributeError is raised as described
below. On looking at source code for urwid at
/usr/lib64/python2.7/site-packages/urwid I see that both main_loop.py and
curses_display.py have a draw_screen function with different arguments :
main_loop.py -> def draw_screen(self):
curses_display.py > def draw_screen(self, (cols, rows), r ):
Do I have to specify which one to use by something like **import
draw_screen from specificFile** command ? Or is there anything
fundamentally wrong I am looking at the canvas concept ? I can also see
that the frame class (**class Frame(BoxWidget):** ) in the file
/usr/lib64/python2.7/site-packages/urwid/**container.py** has a render
function (**def render(self, size, focus=False):**)
Error on running code is :
`
Traceback (most recent call last):
File "./yamlUrwidUIPhase6.py", line 104, in <module>
main()
File "./yamlUrwidUIPhase6.py", line 98, in main
form.main()
File "./yamlUrwidUIPhase6.py", line 51, in main
self.loop.run()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line
274, in run
self.screen.run_wrapper(self._run)
File "/usr/lib64/python2.7/site-packages/urwid/raw_display.py", line
237, in run_wrapper
return fn()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line
285, in _run
self.draw_screen()
File "/usr/lib64/python2.7/site-packages/urwid/main_loop.py", line
508, in draw_screen
canvas = self._topmost_widget.render(self.screen_size, focus=True)
AttributeError: 'NoneType' object has no attribute 'render'
`
The code :
import sys
sys.path.append('./lib')
import os
from pprint import pprint
import random
import urwid
ui=urwid.raw_display.Screen()
class FormDisplay(object):
def __init__(self):
global ui
self.ui = ui
self.palette = self.ui.register_palette([
('Field', 'dark green, bold', 'black'), # information
fields, Search: etc.
('Info', 'dark green', 'black'), # information in fields
('Bg', 'black', 'black'), # screen background
('InfoFooterText', 'white', 'dark blue'), # footer text
('InfoFooterHotkey', 'dark cyan, bold', 'dark blue'), #
hotkeys in footer text
('InfoFooter', 'black', 'dark blue'), # footer background
('InfoHeaderText', 'white, bold', 'dark blue'), # header
text
('InfoHeader', 'black', 'dark blue'), # header background
('BigText', RandomColor(), 'black'), # main menu banner text
('GeneralInfo', 'brown', 'black'), # main menu text
('LastModifiedField', 'dark cyan, bold', 'black'), # Last
modified:
('LastModifiedDate', 'dark cyan', 'black'), # info in Last
modified:
('PopupMessageText', 'black', 'dark cyan'), # popup message
text
('PopupMessageBg', 'black', 'dark cyan'), # popup message
background
('SearchBoxHeaderText', 'light gray, bold', 'dark cyan'), #
field names in the search box
('SearchBoxHeaderBg', 'black', 'dark cyan'), # field name
background in the search box
('OnFocusBg', 'white', 'dark magenta') # background when a
widget is focused
])
urwid.set_encoding('utf8')
def main(self):
global ui
#self.view = ui.run_wrapper(formLayout)
self.ui.start()
self.view = formLayout()
self.loop = urwid.MainLoop(self.view, self.palette,
unhandled_input=self.unhandled_input)
self.loop.run()
def unhandled_input(self, key):
if key == 'f8':
quit()
return
def formLayout():
global ui
text1 = urwid.Text("Urwid 3DS Application program - F8 exits.")
text2 = urwid.Text("One mission accomplished")
textH = urwid.Text("topmost Pile text")
cols = urwid.Columns([text1,text2])
pile = urwid.Pile([textH,cols])
fill = urwid.Filler(pile)
textT = urwid.Text("Display")
textSH = urwid.Text("Pile text in Frame")
textF = urwid.Text("Good progress !")
frame =
urwid.Frame(fill,header=urwid.Pile([textT,textSH]),footer=textF)
dim = ui.get_cols_rows()
#ui is treated as global handle for all functions, either belonging
#to any class or standalone functions such as formLayout
#need to check if screen has been started
if not ui._started:
print("Screen has not been started, so no use of rendering.Thus
return :-( ")
return
ui.draw_screen(dim, frame.render(dim, True))
return
def RandomColor():
'''Pick a random color for the main menu text'''
listOfColors = ['dark red', 'dark green', 'brown', 'dark blue',
'dark magenta', 'dark cyan', 'light gray',
'dark gray', 'light red', 'light green', 'yellow',
'light blue', 'light magenta', 'light cyan',
'default']
color = listOfColors[random.randint(0, 14)]
return color
def main():
form = FormDisplay()
form.main()
########################################
##### MAIN ENTRY POINT
########################################
if __name__ == '__main__':
main()
I don't want to change the function formLayout as I intend to add more to
this basic code framework, where in another function will be added that
repeatedly calls formLayout to keep updating the screen based on reading
values from a yml file. I already have a separate code that deals with
reading the yaml file and extracting ordered dictionaries out it. After
figuring out how to get basic urwid console working, I can move on to
integrating both to create my final application.
regards
Tauseef
...
--
Kind Regards
Tauseef Hussain
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Kind Regards
Tauseef Hussain
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