[Tkinter-discuss] Fwd: WxPython -> Tkinter

[Guilherme Polo]

On Sun, Nov 2, 2008 at 2:40 PM, Guilherme Polo <ggpolo at gmail.com> wrote:
> On Sun, Nov 2, 2008 at 12:34 PM, Olrik Lenstra <o.lenstra at gmail.com> wrote:
>> I would like to thank you already for all the help you've given me, it
>> is really appreciated :)
>
> You are welcome.
>
>> I decided to update to Python2.6 instead of using the tile pack. My
>> application now shows the GUI again.
>> So I added the code you gave me to prevent the window from hanging
>> once I execute my scan.
>> I get the following Traceback:
>>
>> D:\Documents\OLPrograms\TroubleShooting Olrik\sourcecode\TSO(source)>python TSO.
>> pyw
>> Exception in Tkinter callback
>> Traceback (most recent call last):
>>  File "D:\Python26\lib\lib-tk\Tkinter.py", line 1410, in __call__
>>    return self.func(*args)
>>  File "D:\Documents\OLPrograms\TroubleShooting Olrik\sourcecode\TSO(source)\TSO
>> main.pyw", line 29, in OnScan
>>    TSOscn.Scan(root, status)
>>  File "D:\Documents\OLPrograms\TroubleShooting Olrik\sourcecode\TSO(source)\TSO
>> scn.pyw", line 23, in Scan
>>    TSOex.safe_yield(Frame, True)
>>  File "D:\Documents\OLPrograms\TroubleShooting Olrik\sourcecode\TSO(source)\TSO
>> ex.pyw", line 75, in safe_yield
>>    window_disabler(window)
>>  File "D:\Documents\OLPrograms\TroubleShooting Olrik\sourcecode\TSO(source)\TSO
>> ex.pyw", line 90, in window_disabler
>>    if widget.instate(['!disabled']):
>> AttributeError: Button instance has no attribute 'instate'
>>
>
> That is because Button is not a ttk.Button, but a "normal"
> Tkinter.Button. I didn't know before you would be using windows, but
> since this is the case, you may try substituting the use of instate
> and state calls (that are available only for ttk widgets) by the use
> of widget.wm_attributes('-disabled', 1),
> widget.wm_attributes('-disabled', 0) and
> widget.wm_attributes('-disabled'). I will be able to test it here
> later since my new pc arrived with a windows vista.
>

I have changed it a bit now, please retry with this one:

import sys

inside_tkyield = False
disabled_wins = {}
platform_win = 'win' in sys.platform
if not platform_win:
    import ttk

def safe_yield(window, only_if_needed=False):
    window_disabler(window)
    try:
        return tk_yield(window, only_if_needed)
    finally:
        window_enabler(window)


def window_enabler(window):
    for widget, flags in disabled_wins.iteritems():
        if platform_win:
            window.wm_attributes('-disabled', 0)
        else:
            ttk.Widget.state(widget, flags)
    disabled_wins.clear()


def window_disabler(window):
    if platform_win and not int(window.wm_attributes('-disabled')):
        window.wm_attributes('-disabled', 1)
        disabled_wins[window] = 1
        return

    widgets = window.children.values()
    widgets.append(window)

    for widget in widgets:
        if widget.instate(['!disabled']):
            prev_flags = widget.state(['disabled'])
            disabled_wins[widget] = prev_flags


def tk_yield(window, only_if_needed=False):
    # wx implements this differently based on the backend it is using
    global inside_tkyield
    if inside_tkyield:
        if not only_if_needed:
            raise RuntimeError("safe_yield called recursively")

        return False

    inside_tkyield = True;

    window.update()
    window.update_idletasks()

    inside_tkyield = False;

    return True

It should work under windows, but it is not very nice elsewhere right
now unfortunately.

>> D:\Documents\OLPrograms\TroubleShooting Olrik\sourcecode\TSO(source)>
>>
>> I don't know if it makes a difference, But I think you should know
>> that I use different files that import other applications (made by me)
>> Example:
>>
>> TSO.pyw is the main script, this looks if the very first argument is
>> "TSO.pyw", if it is, run "TSOmain.TSO()"
>> TSOmain.pyw is the GUI and the GUI only, from there it calls other files etc.
>> I hope that wasn't too confusing.
>>
>> Thanks again, I really appreciate it.
>>
>> Regards,
>> Olrik
>>


-- 
-- Guilherme H. Polo Goncalves