I am working in the module stock_barcode

I try to edit the product_selector on case Confirm button

First I try this code to change the confirm button like this

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XML CODE 

            stock.move.line.product.selector.inherit

            stock.move.line

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and I add python code code 

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class StockMoveLine(models.Model):

    _inherit = 'stock.move.line'

   def write(self, vals):

        return super(StockMoveLine, self).write(vals)

    def custom_save_method(self):

        // Code here 

        return _self.write({})
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when I try to press confirm button It will going to the write function

before It going to the custom_save_method function

so I can't write my code in custom_save_method method because I want to make case to stop saving the data

and when I try to write code in "write" method , It will applied any where with the model 'stock.move.line'

how can I make the code know if the confirm order came from the product_selector view or not

Please any one help me in this issue