Add stage 4

Author: jonathanrocher

setup.py

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+from setuptools import setup, find_packages
+
+
+setup(
+    name="ets_tutorial",
+    version="0.0.1",
+    description='Common utilities and tools for all applications in the '
+                'tutorial',
+    packages=find_packages(),
+)

stage4_first_application/README.md

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+# Hello world in ETS pyface!

stage4_first_application/pycasa/__init__.py

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+
+__version__ = "0.0.1"

stage4_first_application/pycasa/app/__init__.py

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+# coding=utf-8
+""" TaskApplication object for the Pycasa app.
+"""
+import logging
+
+from pyface.tasks.api import TasksApplication, TaskFactory
+from ..ui.tasks.pycasa_task import PycasaTask
+
+logger = logging.getLogger(__name__)
+
+
+class PycasaApplication(TasksApplication):
+    """ An application to say hello.
+    """
+    id = "pycasa_application"
+
+    name = "Pycasa"
+
+    description = "An example Tasks application that explores image files."
+
+    def _task_factories_default(self):
+        return [
+            TaskFactory(
+                id='pycasa.hello_world_task',
+                name="Hellow World Editor",
+                factory=PycasaTask
+            )
+        ]

stage4_first_application/pycasa/app/app.py

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+
+from pycasa.app.app import PycasaApplication
+
+
+def main():
+    app = PycasaApplication()
+    app.run()
+
+
+if __name__ == '__main__':
+    main()

stage4_first_application/pycasa/app/main.py

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+from os.path import expanduser
+from traits.api import Directory, Event, HasStrictTraits
+
+
+class FileBrowser(HasStrictTraits):
+    root = Directory(expanduser("~"))
+
+    #: Item last double-clicked on in the tree view
+    requested_item = Event

stage4_first_application/pycasa/model/__init__.py

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+import PIL.Image
+from PIL.ExifTags import TAGS
+
+from traits.api import Dict, File, HasStrictTraits, observe, Property
+
+
+class ImageFile(HasStrictTraits):
+    """ Model to hold an image file.
+    """
+    filepath = File
+
+    metadata = Dict
+
+    @observe("filepath")
+    def load_metadata(self, event):
+        img = PIL.Image.open(self.filepath)
+        exif = img._getexif()
+        if exif:
+            self.metadata = {TAGS[k]: v for k, v in exif.items()
+                             if k in TAGS}