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#4358 pydoc strings for activity.py

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Pascal Scheffers 17 years ago
parent 91c97ba018
commit 4d26d30710
2 changed files with 234 additions and 12 deletions
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NEWS
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@ -1,3 +1,5 @@
* #4358: pydoc strings for sugar.activity.Activity
Snapshot 176262f2e9
* Added morgs NotifyAlert (timed one button alert) to the alert api (erikos)

244
lib/sugar/activity/activity.py
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@ -1,7 +1,31 @@
"""Base class for Python-coded activities
"""Base class for activities written in Python
This is currently the only reference for what an
This is currently the only definitive reference for what an
activity must do to participate in the Sugar desktop.
A Basic Activity
All activities must implement a class derived from 'Activity' in this class.
The convention is to call it ActivitynameActivity, but this is not required as
the activity.info file associated with your activity will tell the sugar-shell
which class to start.
For example the most minimal Activity:
from sugar.activity import activity
class ReadActivity(activity.Activity):
pass
To get a real, working activity, you will at least have to implement:
__init__(), read_file() and write_file()
Aditionally, you will probably need a at least a Toolbar so you can have some
interesting buttons for the user, like for example 'exit activity'
See the methods of the Activity class below for more information on what you
will need for a real activity.
"""
# Copyright (C) 2006-2007 Red Hat, Inc.
#
@ -49,6 +73,11 @@ SCOPE_INVITE_ONLY = "invite" # shouldn't be shown in UI, it's implicit when you
SCOPE_NEIGHBORHOOD = "public"
class ActivityToolbar(gtk.Toolbar):
"""The Activity toolbar with the Journal entry title, sharing, Keep and Stop buttons
All activities should have this toolbar. It is easiest to add it to your
Activity by using the ActivityToolbox.
"""
def __init__(self, activity):
gtk.Toolbar.__init__(self)
@ -169,6 +198,38 @@ class ActivityToolbar(gtk.Toolbar):
self._update_share()
class EditToolbar(gtk.Toolbar):
"""Provides the standard edit toolbar for Activities.
Members:
undo -- the undo button
redo -- the redo button
copy -- the copy button
paste -- the paste button
separator -- A separator between undo/redo and copy/paste
This class only provides the 'edit' buttons in a standard layout, your activity
will need to either hide buttons which make no sense for your Activity, or you
need to connect the button events to your own callbacks:
## Example from Read.activity:
# Create the edit toolbar:
self._edit_toolbar = EditToolbar(self._view)
# Hide undo and redo, they're not needed
self._edit_toolbar.undo.props.visible = False
self._edit_toolbar.redo.props.visible = False
# Hide the separator too:
self._edit_toolbar.separator.props.visible = False
# As long as nothing is selected, copy needs to be insensitive:
self._edit_toolbar.copy.set_sensitive(False)
# When the user clicks the button, call _edit_toolbar_copy_cb()
self._edit_toolbar.copy.connect('clicked', self._edit_toolbar_copy_cb)
# Add the edit toolbar:
toolbox.add_toolbar(_('Edit'), self._edit_toolbar)
# And make it visible:
self._edit_toolbar.show()
"""
def __init__(self):
gtk.Toolbar.__init__(self)
@ -198,6 +259,23 @@ class EditToolbar(gtk.Toolbar):
self.paste.show()
class ActivityToolbox(Toolbox):
"""Creates the Toolbox for the Activity
By default, the toolbox contains only the ActivityToolbar. After creating the
toolbox, you can add your activity specific toolbars, for example the
EditToolbar.
To add the ActivityToolbox to your Activity in MyActivity.__init__() do:
# Create the Toolbar with the ActivityToolbar:
toolbox = activity.ActivityToolbox(self)
... your code, inserting all other toolbars you need, like EditToolbar ...
# Add the toolbox to the activity frame:
self.set_toolbox(toolbox)
# And make it visible:
toolbox.show()
"""
def __init__(self, activity):
Toolbox.__init__(self)
@ -209,7 +287,71 @@ class ActivityToolbox(Toolbox):
return self._activity_toolbar
class Activity(Window, gtk.Container):
"""Base Activity class that all other Activities derive from."""
"""This is the base Activity class that all other Activities derive from. This is where your activity starts.
To get a working Activity:
0. Derive your Activity from this class:
class MyActivity(activity.Activity):
...
1. implement an __init__() method for your Activity class.
Use your init method to create your own ActivityToolbar which will
contain some standard buttons:
toolbox = activity.ActivityToolbox(self)
Add extra Toolbars to your toolbox.
You should setup Activity sharing here too.
Finaly, your Activity may need some resources which you can claim
here too.
The __init__() method is also used to make the distinction between
being resumed from the Journal, or starting with a blank document.
2. Implement read_file() and write_file()
Most activities revolve around creating and storing Journal entries.
For example, Write: You create a document, it is saved to the Journal
and then later you resume working on the document.
read_file() and write_file() will be called by sugar to tell your
Activity that it should load or save the document the user is working
on.
3. Implement our Activity Toolbars.
The Toolbars are added to your Activity in step 1 (the toolbox), but
you need to implement them somewhere. Now is a good time.
There are a number of standard Toolbars. The most basic one, the one
your almost absolutely MUST have is the ActivityToolbar. Without
this, you're not really making a proper Sugar Activity (which may be
okay, but you should really stop and think about why not!) You do
this with the ActivityToolbox(self) call in step 1.
Usually, you will also need the standard EditToolbar. This is the one
which has the standard copy and paste buttons. You need to derive
your own EditToolbar class from sugar.EditToolbar:
class EditToolbar(activity.EditToolbar):
...
See EditToolbar for the methods you should implement in your class.
Finaly, your Activity will very likely need some activity specific
buttons and options you can create your own toolbars by deriving a
class from gtk.Toolbar:
class MySpecialToolbar(gtk.Toolbar):
...
4. Use your creativity. Make your Activity something special and share
it with your friends!
Read through the methods of the Activity class below, to learn more about
how to make an Activity work.
Hint: A good and simple Activity to learn from is the Read activity. To
create your own activity, you may want to copy it and use it as a template.
"""
__gtype_name__ = 'SugarActivity'
__gsignals__ = {
@ -248,6 +390,11 @@ class Activity(Window, gtk.Container):
Creates an ActivityService (self._bus) servicing
this application.
Usage:
If your Activity implements __init__(), it should call
the base class __init()__ before doing Activity specific things.
"""
Window.__init__(self)
@ -360,12 +507,25 @@ class Activity(Window, gtk.Container):
return self._max_participants
def get_id(self):
"""Returns the activity id of the current instance of your activity.
The activity id is sort-of-like the unix process id (PID). However,
unlike PIDs it is only different for each new instance (with
create_jobject = True set) and stays the same everytime a user
resumes an activity. This is also the identity of your Activity to other
XOs for use when sharing.
"""
return self._activity_id
def get_bundle_id(self):
"""Returns the bundle_id from the activity.info file"""
return os.environ['SUGAR_BUNDLE_ID']
def set_canvas(self, canvas):
"""Sets the 'work area' of your activity with the canvas of your choice.
One commonly used canvas is gtk.ScrolledWindow
"""
Window.set_canvas(self, canvas)
canvas.connect('map', self.__canvas_map_cb)
@ -380,10 +540,17 @@ class Activity(Window, gtk.Container):
logging.debug("Error creating activity datastore object: %s" % err)
def get_activity_root(self):
"""
Return the appropriate location in the fs where to store activity related
data that doesn't pertain to the current execution of the activity and
thus cannot go into the DataStore.
"""Returns a path for saving Activity specific preferences, etc.
Returns a path to the location in the filesystem where the activity can
store activity related data that doesn't pertain to the current
execution of the activity and thus cannot go into the DataStore.
Currently, this will return something like ~/.sugar/default/MyActivityName/
Activities should ONLY save settings, user preferences and other data
which isn't specific to a journal item here. If (meta-)data is in anyway
specific to a journal entry, it MUST be stored in the DataStore.
"""
if os.environ.has_key('SUGAR_ACTIVITY_ROOT') and \
os.environ['SUGAR_ACTIVITY_ROOT']:
@ -395,6 +562,17 @@ class Activity(Window, gtk.Container):
"""
Subclasses implement this method if they support resuming objects from
the journal. 'file_path' is the file to read from.
You should immediately open the file from the file_path, because the
file_name will be deleted immediately after returning from read_file().
Once the file has been opened, you do not have to read it immediately:
After you have opened it, the file will only be really gone when you
close it.
Although not required, this is also a good time to read all meta-data:
the file itself cannot be changed externally, but the title, description
and other metadata['tags'] may change. So if it is important for you to
notice changes, this is the time to record the originals.
"""
raise NotImplementedError
@ -402,6 +580,17 @@ class Activity(Window, gtk.Container):
"""
Subclasses implement this method if they support saving data to objects
in the journal. 'file_path' is the file to write to.
If the user did make changes, you should create the file_path and save
all document data to it.
Additionally, you should also write any metadata needed to resume your
activity. For example, the Read activity saves the current page and zoom
level, so it can display the page.
Note: Currently, the file_path *WILL* be different from the one you
received in file_read(). Even if you kept the file_path from file_read()
open until now, you must still write the entire file to this file_path.
"""
raise NotImplementedError
@ -466,7 +655,13 @@ class Activity(Window, gtk.Container):
self._preview = self._get_preview()
def save(self):
"""Request that the activity is saved to the Journal."""
"""Request that the activity is saved to the Journal.
This method is called by the close() method below. In general,
activities should not override this method. This method is part of the
public API of an Acivity, and should behave in standard ways. Use your
own implementation of write_file() to save your Activity specific data.
"""
logging.debug('Activity.save: %r' % self._jobject.object_id)
@ -507,6 +702,11 @@ class Activity(Window, gtk.Container):
error_handler=self.__save_error_cb)
def copy(self):
"""Request that the activity 'Keep in Journal' the current state of the activity.
Activities should not override this method. Instead, like save() do any
copy work that needs to be done in write_file()
"""
logging.debug('Activity.copy: %r' % self._jobject.object_id)
self._preview = self._get_preview()
self.save()
@ -570,6 +770,12 @@ class Activity(Window, gtk.Container):
logging.error('Cannot invite %s, no such buddy.' % buddy_key)
def invite(self, buddy_key):
"""Invite a buddy to join this Activity.
Side Effects:
Calls self.share(True) to privately share the activity if it wasn't
shared before.
"""
self._invites_queue.append(buddy_key)
if (self._shared_activity is None
@ -598,6 +804,11 @@ class Activity(Window, gtk.Container):
self._pservice.share_activity(self, private=private)
def close(self):
"""Request that the activity be stopped and saved to the Journal
Activities should not override this method, but should implement write_file() to
do any state saving instead.
"""
self.save()
if self._shared_activity:
@ -617,6 +828,17 @@ class Activity(Window, gtk.Container):
return True
def get_metadata(self):
"""Returns the jobject metadata or None if there is no jobject.
Activities can set metadata in write_file() using:
self.metadata['MyKey'] = "Something"
and retrieve metadata in read_file() using:
self.metadata.get('MyKey', 'aDefaultValue')
Note: Make sure your activity works properly if one or more of the
metadata items is missing. Never assume they will all be present.
"""
if self._jobject:
return self._jobject.metadata
else:
@ -625,12 +847,10 @@ class Activity(Window, gtk.Container):
metadata = property(get_metadata, None)
def get_bundle_name():
"""Return the bundle name for the current process' bundle
"""
"""Return the bundle name for the current process' bundle"""
return os.environ['SUGAR_BUNDLE_NAME']
def get_bundle_path():
"""Return the bundle path for the current process' bundle
"""
"""Return the bundle path for the current process' bundle"""
return os.environ['SUGAR_BUNDLE_PATH']

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