From 4d26d307109c4db2bfcf1fa43ecb475f1ab37c27 Mon Sep 17 00:00:00 2001 From: Pascal Scheffers Date: Sun, 28 Oct 2007 15:56:05 +0000 Subject: #4358 pydoc strings for activity.py --- (limited to 'lib') diff --git a/lib/sugar/activity/activity.py b/lib/sugar/activity/activity.py index 731a88a..14cadd7 100644 --- a/lib/sugar/activity/activity.py +++ b/lib/sugar/activity/activity.py @@ -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'] -- cgit v0.9.1