johnf wrote:
> On Tuesday 04 November 2008 11:38:25 am Paul McNett wrote:
>> johnf wrote:
>>> It took a long time to figure out find the root cause. Even now I'm
>>> unsure that we are going about this correctly. But this function is
>>> required - somehow we need to be able to change the screen view from
>>> pounds to kilos.
>> In my app the user can choose millimeters or inches for unit_of_measure.
>> They make the choice from a dropdown list, and immediately all length/width
>> fields recalculate and update. I don't recall this being difficult, so if
>> you are still struggling getting this updating to happen, perhaps you
>> should post some code to show us what you've tried?
>>
>> The biggest issue for me is the rounding errors that occur when converting
>> from 1-31/32 to millimeters, when they only want millimeters to the tenth
>> place. Converting back to inches can make it round to 2 or 1-15/16. But I
>> don't have any screen update issues like you seem to be struggling with.
>>
>> Paul
>
> The math is not even an issue. That is always right. It's the display that
> is causing us grief. Could you post your code that changes the screen. Our
> code is this long winded thing. I should tell you that our code actually
> does three things.
>
> 1. displays pounds and oz in two text boxes one for pounds and one for oz
> 2. displays kilos if greater than 1000g
> 3. displays grams if not a kilo.
>
> Maybe not the code but the approach?
Here's the relevant code:
{{{
62 class DrpUOM(dabo.ui.dDropdownList):
63 def initProperties(self):
64 self.ValueMode = "Key"
65 self.Choices = ['Inches', 'Millimeters']
66 self.Keys = {"inches":0, "millimeters":1}
67
68 def onHit(self, evt):
69 biz = self.Form.Bizobj
70 uom_opening = biz.Record.unit_of_measure
71 if self.Value == uom_opening:
72 return
73
74 def okay(first, second):
75 return dabo.ui.areYouSure("You need to review the opening
carefully
after converting the unit "
76 "of measure. Are you sure you want to convert this opening
from %s
to %s at this time?"
77 % (first, second), cancelButton=False)
78
79 if self.Value == "inches" and uom_opening == "millimeters":
80 convert_from, convert_to = "millimeters", "inches"
81 elif self.Value == "millimeters" and uom_opening in ("inches", ""):
82 convert_from, convert_to = "inches", "millimeters"
83
84 if okay(convert_from, convert_to):
85 biz.convert_uom(convert_to)
86 self.Form.update_sizes()
87 self.Form.setUnitOfMeasure()
477 def update_sizes(self):
478 biz = self.Bizobj
479 if not getattr(self, "txtWidth", None) or not biz or biz.RowCount
< 1:
480 return
481
482 self.txtWidth.update()
483 self.txtHeight.update()
484
485 biz.updateNetSize()
486 self.update_calculator()
Paul
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