ToDos

Shows two array controllers, one to manage the contents of a table view, the other to manage a pop-up menu in a table column. Also shows two value transformers to alter the color of text.

Originally from “Cocoa Bindings Examples and Hints”, converted to PyObjC by u.fiedler.

Sources

Category.py

#
#  Category.py
#  ToDos
#
#  Converted by u.fiedler on 09.02.05.
#
#  The original version was written in Objective-C by Malcolm Crawford
#  at http://homepage.mac.com/mmalc/CocoaExamples/controllers.html

from Foundation import *
import objc


class Category(NSObject):
    title = objc.ivar('title')
    priority = objc.ivar('priority', 'i')

    @classmethod
    def allCategories(cls):
        """Predefined global list of categories"""
        return categories

    @classmethod
    def categoryForPriority_(cls, thePriority):
        for category in categories:
            if thePriority >= category.priority:
                return category
        return None

    @classmethod
    def categoryWithTitle_andPriority_(cls, aTitle, aValue):
        """Convenience constructor"""
        newCategory = Category.alloc().init()
        newCategory.title = aTitle
        newCategory.priority = aValue
        return newCategory


    # NSCoding methods
    # To encode, simply save 'priority'; on decode, replace self with
    # the existing instance from 'allCategories' with the same priority

    def encodeWithCoder_(self, encoder):
        if encoder.allowsKeyedCoding():
            encoder.encodeInt_forKey_(self.priority, u"priority")
        else:
            encoder.encodeObject_(self.priority)

    def initWithCoder_(self, decoder):
        if decoder.allowsKeyedCoding():
            thePriority = decoder.decodeIntForKey_(u"priority")
        else:
            thePriority = decoder.decodeObject()
        return Category.categoryForPriority_(thePriority)


categories = [
        Category.categoryWithTitle_andPriority_(u"Vital", 11),
        Category.categoryWithTitle_andPriority_(u"Very Important", 4),
        Category.categoryWithTitle_andPriority_(u"Important", 3),
        Category.categoryWithTitle_andPriority_(u"Not Important", 2),
        Category.categoryWithTitle_andPriority_(u"Whenever", 0)
]

OverdueTransformer.py

#
#  OverdueTransformer.py
#  ToDos
#
#  Converted by u.fiedler on 09.02.05.
#
#  The original version was written in Objective-C by Malcolm Crawford
#  at http://homepage.mac.com/mmalc/CocoaExamples/controllers.html

from Foundation import *
from AppKit import *

class OverdueTransformer(NSValueTransformer):

    @classmethod
    def transformedValueClass(cls):
        return NSColor

    @classmethod
    def allowsReverseTransformation(cls):
        return False

    def transformedValue_(self, aDate):
        if aDate is None:
            return None
        if aDate.timeIntervalSinceNow() < 0:
            return NSColor.redColor()
        return NSColor.blackColor()

PriorityToColourTransformer.py

#
#  PriorityToColourTransformer.py
#  ToDos
#
#  Converted by u.fiedler on 09.02.05.
#
#  The original version was written in Objective-C by Malcolm Crawford
#  at http://homepage.mac.com/mmalc/CocoaExamples/controllers.html

from Foundation import NSValueTransformer
from AppKit import NSColor

class PriorityToColourTransformer(NSValueTransformer):

    @classmethod
    def transformedValueClass(cls):
        return NSColor

    @classmethod
    def allowsReverseTransformation(cls):
        return False

    def transformedValue_(self, priority):
        if priority > 4:
            return NSColor.redColor()
        elif priority > 3:
            return NSColor.orangeColor()
        elif priority > 2:
            return NSColor.blueColor()
        elif priority > 1:
            return NSColor.greenColor()
        elif priority > 0:
            return NSColor.brownColor()
        else:
            return NSColor.blackColor()

ToDos.py

import ToDosDocument

if __name__ == '__main__':
    from PyObjCTools import AppHelper
    AppHelper.runEventLoop()

ToDosDocument.py

#
#  ToDosDocument.py
#  ToDos
#
#  Converted by u.fiedler on 09.02.05.
#
#  The original version was written in Objective-C by Malcolm Crawford
#  at http://homepage.mac.com/mmalc/CocoaExamples/controllers.html

from AppKit import *

from Category import Category
from PriorityToColourTransformer import PriorityToColourTransformer
from OverdueTransformer import OverdueTransformer

class ToDosDocument(NSDocument):
    nix = objc.IBOutlet()
    toDos = objc.ivar()

    def init(self):
        self = super(ToDosDocument, self).init()
        if self is None:
            return None
        self.toDos = NSMutableArray.array()
        return self # if this line is missing you will get the
                    # simple message: "Can't create new document"

    def categories(self):
        return Category.allCategories()

    def windowNibName(self):
        return u"ToDosDocument"

    def dataRepresentationOfType_(self, aType):
        return NSKeyedArchiver.archivedDataWithRootObject_(self.toDos)

    def loadDataRepresentation_ofType_(self, data, aType):
        self.toDos = NSKeyedUnarchiver.unarchiveObjectWithData_(data)
        return True

priorityTransformer = PriorityToColourTransformer.alloc().init()
NSValueTransformer.setValueTransformer_forName_(
    priorityTransformer, u"PriorityToColourTransformer")

overdueTransformer = OverdueTransformer.alloc().init()
NSValueTransformer.setValueTransformer_forName_(
    overdueTransformer, u"OverdueTransformer")

setup.py

"""
Script for building the example:

Usage:
    python setup.py py2app
"""
from distutils.core import setup
import py2app

plist = dict(
    CFBundleDocumentTypes = [
        dict(
            CFBundleTypeExtensions=[u'ToDos', u'*'],
            CFBundleTypeName=u'ToDos File',
            CFBundleTypeRole=u'Editor',
            NSDocumentClass=u'ToDosDocument',
        ),
    ],
)

setup(
    name='ToDos',
    app=["ToDos.py"],
    data_files=["English.lproj"],
    options=dict(py2app=dict(
        plist=plist,
    )),
)

Resources

• Download example