[Sugar-devel] GSoC Update: SharedTextDemo-3

[Walter Bender]

For V4, it may be interesting to add some tuple exports to the Journal as
well... Let's discuss it next time we bump into each other on IRC.

-walter

On Mon, Jun 22, 2009 at 10:56 PM, Benjamin M. Schwartz <
bmschwar at fas.harvard.edu> wrote:

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> SharedTextDemo-3 is available at
> http://dev.laptop.org/~bemasc/SharedTextDemo-3.xo<http://dev.laptop.org/%7Ebemasc/SharedTextDemo-3.xo>
>
> This version introduces saving to and loading from the Journal.  The
> contents of the textbox are saved to the Journal, and loaded back in when
> you relaunch the program.  This may not sound like a very impressive
> feature, but consider the source code of the activity (in its entirety):
>
> """
> from groupthink import sugar_tools, gtk_tools
> import sugar
>
> class SharedTextDemoActivity(sugar_tools.GroupActivity):
>    def initialize_display(self):
>        self.cloud.textview = gtk_tools.SharedTextView()
>        return self.cloud.textview
> """
>
> The self.cloud object takes care not only of sharing the TextView over the
> network, live, but also of serializing it to disk on save, and
> deserializing it on load.  At 6 lines of code, this system is finally
> approaching a level of boilerplate I would consider acceptable for users
> to build their own activities.*
>
> In addition to working Journal persistence, this version also adds (very
> simple) wait screens.  With wait screens, the user is not left at the
> pulsing activity icon during slow actions, like loading a large journal
> entry or joining a shared session.  Instead, the activity displays a
> message informing the user of its current status as soon as possible after
> launch.  Naturally, both automatic load/save and wait screens are
> available to any activity using Groupthink, not just SharedTextDemo.
>
> - --Ben
>
> *: There is admittedly a tradeoff here between flexibility and magic.
> self.cloud, providing magic load/save and sharing, will only accept
> objects of appropriate type, drawn from the groupthink library.  This
> means that users must code with an understanding of the types of the
> objects they are using.
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-- 
Walter Bender
Sugar Labs
http://www.sugarlabs.org
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