ManualBindings
==============

* :download:`Download example <PyObjCExample-ManualBindings.zip>`

A PyObjC Example without documentation

.. rst-class:: tabber

Sources
-------

.. rst-class:: tabbertab

AppController.py
................

.. sourcecode:: python

    #
    #  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

.. rst-class:: tabbertab

ManualBindings.py
.................

.. sourcecode:: python

    # import classes required to start application
    import AppController  # noqa: F401
    from PyObjCTools import AppHelper
    
    # start the event loop
    AppHelper.runEventLoop()

.. rst-class:: tabbertab

setup.py
........

.. sourcecode:: python

    """
    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"],
    )

