Re: [tauruslib-devel] [Sardana-users] Validate input of TaurusLabelEditRW

[Grzegorz K. <g.k...@uj...>]

Hi Carlos,
Thank you very much!
Your solution works flawlessly.
I have created a ticket:
https://sourceforge.net/p/tauruslib/tickets/331/

Again, thank you for help!

On 07/28/2016 12:24 PM, Carlos Manuel Falcon Torres wrote:
> Hi Grzegorz,
> The actual TaurusLabelEditRW can not allow this "feature", the method
> setValidator is there because it comes from Qt widgets.
> TaurusLabelEditRW uses the TaurusLineEdit as writewidget and it 
> overwrites the used validator in each event.
> TaurusLineEdit creates the validator each time attending the attribute
> range, that is the reason because your solution does not work.
> 
> That I propose you is an ugly workaround :
> 
> The workaround consists in create your own TaurusLineEdit widget and
> overwrite the "_updateValidator" method.
> 
> Unfortunately these classes are not documented so I hope  this example
> can help you.
> 
>     import sys
> 
>     from taurus.external.qt import QtGui
> 
>     from taurus.qt.qtgui.application import TaurusApplication
>     from taurus.qt.qtgui.input import TaurusValueLineEdit
>     from taurus.qt.qtgui.compact import TaurusLabelEditRW
> 
> 
>     class MyTaurusValueLineEdit(TaurusValueLineEdit):
>         # Reimplement _updateValidator method
>         def _updateValidator(self, attrinfo):
>             pass
> 
> 
>     app = TaurusApplication()
> 
>     f = TaurusLabelEditRW(writeWClass=MyTaurusValueLineEdit)
>     f.model = 'sys/tg_test/1/double_scalar_w'
>     validator = QtGui.QDoubleValidator(10, 20, 5)
>     f.writeWidget.setValidator(validator)
> 
>     f.show()
>     sys.exit(app.exec_())
> 
> 
> The other option is somehow in your widget update dynamically the range
> of your attribute.
> 
> 
> Could you create a ticket in taurus [1] to discuss a proper solution for
> taurus?
> 
> [1] https://sourceforge.net/p/tauruslib/tickets/
> 
> 
> Best,
> Carlos
> 
> 
> On 07/27/2016 07:36 PM, Grzegorz Kowalski wrote:
>> Hello,
>> I have a problem with TaurusLabelEditRW, I need to validate its input to
>> only set values inside certain range, but I don't know how to stop it
>> from setting an attribute value when it's invalid.
>>
>> My first try was to use QDoubleValidator with TaurusValueLineEdit that
>> is a part of RW widget, but it seems to ignore validator despite it's
>> based on QLineEdit.
>>
>> code:
>> rw = TaurusLabelEditRW()
>> validator = QDoubleValidator(100, 300, 5)
>> for c in rw.children():
>> 	if c.__class__.__name__ == "TaurusValueLineEdit":
>> 		c.setValidator(self.validator)
>>
>> Second try was to connect to returnPressed signal of the line edit, and
>> check the value, but I have no idea on how to prevent setting invalid
>> value to the attribute.
>>
>> The range can't be just Tango attribute's max and min values because it
>> is dependent on other parameters.
>> I'm using Taurus 3.7.0.
>>
>> Thank you for any help!
> 

-- 
Pozdrawiam / Kind regards,
Grzegorz Kowalski

Control systems engineer
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