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* Additional information on plugin configuration options * Better information on plugin installation * Update label printing docs * Rearrange plugin menu * More menu tweaks * Fix links to app images
67 lines
2.3 KiB
Markdown
67 lines
2.3 KiB
Markdown
---
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title: Label Mixin
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---
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## LabelPrintingMixin
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The `LabelPrintingMixin` class enables plugins to print labels directly to a connected printer. Custom plugins can be written to support any printer backend.
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An example of this is the [inventree-brother-plugin](https://github.com/inventree/inventree-brother-plugin) which provides native support for the Brother QL and PT series of networked label printers.
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### Web Integration
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If label printing plugins are enabled, they are able to be used directly from the InvenTree web interface:
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{% with id="label_print", url="plugin/print_label_select_plugin.png", description="Print label via plugin" %}
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{% include 'img.html' %}
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{% endwith %}
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### App Integration
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Label printing plugins also allow direct printing of labels via the [mobile app](../../app/stock.md#print-label)
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## Implementation
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Plugins which implement the `LabelPrintingMixin` mixin class must provide a `print_label` function:
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```python
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from dummy_printer import printer_backend
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class MyLabelPrinter(LabelPrintingMixin, InvenTreePlugin):
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"""
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A simple example plugin which provides support for a dummy printer.
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A more complex plugin would communicate with an actual printer!
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"""
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NAME = "MyLabelPrinter"
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SLUG = "mylabel"
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TITLE = "A dummy printer"
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def print_label(self, **kwargs):
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"""
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Send the label to the printer
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kwargs:
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pdf_data: An in-memory PDF file of the label
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png_file: An in-memory PIL (pillow) Image file of the label
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filename: The filename of the printed label (if applicable)
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label_instance: The Label model instance
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width: width of the label (in mm)
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height: height of the label (in mm)
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user: The user who printed this label
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"""
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width = kwargs['width']
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height = kwargs['height']
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# This dummy printer supports printing of raw image files
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printer_backend.print(png_file, w=width, h=height)
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```
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### Available Data
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The *label* data are supplied to the plugin in both `PDF` and `PNG` formats. This provides compatibility with a great range of label printers "out of the box". Conversion to other formats, if required, is left as an exercise for the plugin developer.
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Other arguments provided to the `print_label` function are documented in the code sample above.
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