With the new views, the barcode mechanisms were completely broken,
because the view and widget JS code was totally changed.
This commit update and refactor all that code to make it work with the
new design philosophy. Also, it update the coding style.
Barcodes are detected by catching keypresses. When a keypress is not
part of a barcode, it is 'released' by forging a keypress event.
For security reasons, a non-native keypress doesn't trigger the native
input mechanism. So in order to make both barcode-scanning and manual
keypresses work in a field, it is necessary to have a handler listen
to the 'false' keypresses and simulate the native input behaviour.
For a model to use it, it must :
- Inherit barcodes.barcode_events_mixin and override on_barcode_scanned(self, barcode)
- Add <field name=barcode_scanned widget=barcode_handler/> to each form view that
should listen to barcode events and trigger on_barcode_scanned.
The method on_barcode_scanned works just like an onchange.
If the module barcodes is installed, a BarcodeEvents singleton is
automatically instanciated. It listens to keypresses and, when a
sequence of keys represents a barcode, it broadcasts a 'barcode_scanned'
event on core.bus containing the barcode string.
Christophe Matthieu