[Shotwell] Enhansment to shotwell

[Bengt Thuree]

Perhaps consider checking how DigiKam is storing the tags.
DigiKam also have a hierarchy system of the tags (f-spot do not).
I think that digikam stores them in the embedded XMP aread as
/tag1/tag2/tag3 format.

/Bengt
Den Fr, 2010-04-23, 22:20 skrev Ruslan A. Bondar:
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> Hello, Adam.
>
> I think the code change will contain following steps:
> 1. Add field "ParentTagId" to TagTable
> 2. Change the TagTable class to handle this field.
> 3. Change the find_parent_marker and add_tag_page methods in LibraryWindow
> to provide recursive tree creation for tag tree.
> 4. Change drag'n'drop handler to allow moving tags between branches.
>
> And something more, such as listeners of tag tree alteration etc. I think
> these changes will not affect any other functionality. And no major
> changes in design are required.
>
> I think it would be better to store only photos "owned" by this tag, but
> on load build the full list, containing photos from this and all child
> tags. And for now I see several ways:
> 1. Create helper table to speedup loading, but this will slow down tag
> reassigning (Tag moving between branches). This table may contain only 2
> fields: TagId and AllTagPhotos.
> 2. Walk over the table recursively and build the list via concatenation,
> this will be slightly slower.
>
> These are the common thoughts. I'll dig the source deeper during the
> weekend.
>
> On Thu, 22 Apr 2010 19:25:51 -0700
> Adam Dingle <adam at yorba.org> wrote:
>
>> Ruslan,
>>
>> thanks for your email.  As you probably know, we're also interested
>> in hierarchical tagging.
>>
>> I think at this point we'd like to implement a single-parent system,
>> in which each tag can have multiple children but only one parent.
>> This is ticket 1401.  After that, we might consider extending the
>> system to support multiple parents in some way.
>>
>> A single-parent tag system in Shotwell would work like this.  In the
>> sidebar, the user should be able to drag any tag A onto any other tag
>> B; then A becomes a child of B.  If the user drags any tag onto the
>> Tags heading, then it becomes a top-level tag.
>>
>> If the user selects any tag, then Shotwell should display all photos
>> which belong to the tag or any of its children.  The set of photos is
>> sorted according to the View->Sort Photos settings.  If a photo
>> belongs to multiple child tags, it is displayed only once in the
>> sorted set.
>>
>> All tag names must be globally unique.  For example, I can't create a
>> tag named "washington" under a parent "states", and another tag also
>> named "washington" under a parent tag "cities".
>>
>> You said you might like to participate in coding this feature - that
>> would be great.  If the description above sounds reasonable to you,
>> as a next step maybe you could look at the Shotwell code and send a
>> brief design proposal to this mailing list.   In your proposal,
>> please describe the database schema changes you intend, plus any new
>> major classes introduced (if any) and any major changes to existing
>> classes. We'd be happy to comment on your implementation plan.
>> Thanks!
>>
>> adam
>>
>> Ruslan A. Bondar wrote:
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>> > Hello all.
>> >
>> > I have an idea, maybe similar to http://trac.yorba.org/ticket/1401,
>> > but I'll tell in more details.
>> >
>> > It would be great to allow organizing tags into graph.
>> > So one tag may have multiple parent and multiple children tags. And
>> > each of them may be assigned to the photo. It will be more flexible
>> > to organize your photos. As an owner of large, enough, photo album
>> > (~100 GB of photos) I can say - This feature is VERY useful.
>> >
>> > Also I'd like to participate in coding of this feature.
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>>
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-- 
Bengt Thuree   bengt at thuree.com