ManualBindings

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A PyObjC Example without documentation

Sources

AppController.py

#
#  AppController.py
#  ManualBindings
#
import objc
from Cocoa import (
    NSDecimal,
    NSError,
    NSLocalizedDescriptionKey,
    NSObject,
    NSValidatesImmediatelyBindingOption,
)


class AppController(NSObject):
    arrayController = objc.IBOutlet()
    selectedNameField = objc.IBOutlet()
    selectedPriceField = objc.IBOutlet()
    tableView = objc.IBOutlet()
    totalCountField = objc.IBOutlet()

    def awakeFromNib(self):
        self.totalCountField.bind_toObject_withKeyPath_options_(
            "value", self.arrayController, "arrangedObjects.@sum.price", None
        )
        bindingOptions = {}
        bindingOptions["NSNullPlaceholder"] = "No Name"
        self.selectedNameField.bind_toObject_withKeyPath_options_(
            "value", self.arrayController, "selection.name", bindingOptions
        )
        # binding for "name" column
        tableColumn = self.tableView.tableColumnWithIdentifier_("name")
        tableColumn.bind_toObject_withKeyPath_options_(
            "value", self.arrayController, "arrangedObjects.name", bindingOptions
        )

        # binding options for "price"
        del bindingOptions["NSNullPlaceholder"]
        bindingOptions[NSValidatesImmediatelyBindingOption] = True

        # binding for selected "price" field
        self.selectedPriceField.bind_toObject_withKeyPath_options_(
            "value", self.arrayController, "selection.price", bindingOptions
        )

        # binding for "price" column
        tableColumn = self.tableView.tableColumnWithIdentifier_("price")
        tableColumn.bind_toObject_withKeyPath_options_(
            "value", self.arrayController, "arrangedObjects.price", bindingOptions
        )

        # bind array controller to self's itemsArray
        # we use _k_itemsArray because Python does not have a separate
        # namespace for instance variables, and we are using accessors.
        self._k_itemsArray = []
        self.arrayController.bind_toObject_withKeyPath_options_(
            "contentArray", self, "self.itemsArray", None
        )

    @objc.accessor
    def countOfItemsArray(self):
        return len(self._k_itemsArray)

    @objc.accessor
    def objectInItemsArrayAtIndex_(self, index):
        return self._k_itemsArray[index]

    @objc.accessor
    def insertObject_inItemsArrayAtIndex_(self, obj, idx):
        self._k_itemsArray.insert(idx, obj)

    @objc.accessor
    def removeObjectFromItemsArrayAtIndex_(self, idx):
        del self._k_itemsArray[idx]

    @objc.accessor
    def replaceObjectInItemsArrayAtIndex_withObject_(self, idx, obj):
        self._k_itemsArray[idx] = obj


ITEM_ERROR_DOMAIN = "ITEM_ERROR_DOMAIN"
ITEM_NEGATIVE_PRICE = 10001


class Item(NSObject):
    def price(self):
        return getattr(self, "_k_price", NSDecimal("0.00"))

    def setPrice_(self, aPrice):
        self._k_price = aPrice

    def name(self):
        return getattr(self, "_k_name", None)

    def setName_(self, aName):
        self._k_name = aName

    @objc.accessor
    def validatePrice_error_(self, value, error):
        if value >= 0:
            return True, value, None

        errorString = "Price cannot be negative"
        userInfoDict = {NSLocalizedDescriptionKey: errorString}
        error = NSError.alloc().initWithDomain_code_userInfo_(
            ITEM_ERROR_DOMAIN, ITEM_NEGATIVE_PRICE, userInfoDict
        )

        return False, value, error

ManualBindings.py

# import classes required to start application
import AppController  # noqa: F401
from PyObjCTools import AppHelper

# start the event loop
AppHelper.runEventLoop()

setup.py

"""
Script for building the example:

Usage:
    python3 setup.py py2app
"""

from setuptools import setup

setup(
    name="ManualBindings",
    app=["ManualBindings.py"],
    data_files=["English.lproj"],
    setup_requires=["py2app", "pyobjc-framework-Cocoa"],
)