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Users don't have to configure their scanner. As stated in the docs/planner,
either wait 50ms between 2 scans or use a suffix.
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Make all common form operations doable through barcode scanning
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Since the method must return a deferred, resolve it with true to proceed with onchange
and with false to prevent the onchange. Deferred failure is not an option.
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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.
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Export a list of barcodes prefixes used for software functionss
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A button can be triggered when a barcode corresponding to its attribute
'barcode_trigger' is scanned
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Only the barcode handlers in the front view should listen to barcode events.
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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.
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TIL: The $(callback) function passes the jquery object to the callback
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This avoids breaking shortcuts on Firefox, which rely on keypress
events instead of keydown / keyup. The tradeoff is that a barcode
cannot be scanned and interpreted if ctrl, alt or cmd is pressed.
Also don't catch function keys.
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BarcodeEvents uses the fact that a barcode usually ends with \n, \r or
\t - and never contains it - to stop buffing keys as soon as such a
character is inputted instead of waiting x milliseconds.
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This functionality was an attemps to fix the chair-to-keyboard
interface in the PoS. Since it is not a standard behaviour, it
must be explicitly requested.
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In order to remove an eventhandler, removeEventListener must receive
the same function reference that was passed to addEventListener. So
the handlers references are kept as attributes of the class.
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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.
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must call web.DataModel.
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Causes issues with the card reader device.
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guessing it from a value encoding barcode
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anywhere in barcode)
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The module system needs to know the dependencies of a given module
before executing the function. This is why the dependencies were
defined once in an array, and then were described one more times in the
call to require.
But a trick can simplify this: the boot function can parse the string
representation of the module and extract the calls to require from it.
It is more work for the processor, but it leads to simpler module
definitions.
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- Added support for UPC-A Barcodes
- Add a way to automatically convert UPC-A to and from EAN13. This
is usefull if you wish to standardise your product barcode encoding
in one standard but have a mix of the two in your merchandise.
- Various bugfixes.
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pattern and barcodes may now contain special characters \ { and ., special character * replaced by .
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a match
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module barcodes, BarcodeParser
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