Revisions for ansel/xrequest.php

let xrequests pass urls around so various pages can know where to return
to when finished.

Rename AnselXRequest.php and to XRequest.php to be in line with the rest of
Ansel's libraries.

Some refactoring. Move ajax request stuff to Ansel_XRequest classes,
similar to Imples.  Still needs some work with the stuff related to
tags, but I plan on refactoring the various widgets anyway...

Enforce naming convention for slugs and add explanatory text.

Add ajax check for slug uniqueness.  I wanted to enable/disable the
submit button based on the validity of the slug, but I can't seem to
get the submit button to disable...

Another go at Ticket: 4350, still needs tweaks but wanted to get the previous
attempt out asap :)

prune some uneccessary code now that we don't do Ajax requests for
these things anymore.

Be more diligent about passing the available style information around
so we can check the existence of a particular view without having to
read image data from the database and instantiate an Ansel_Image object
each time

Bug: 6222
Submitted by: Duck

Statically cache Ansel_Storage::getImage() calls since they can often
be called multiple times per page load and from different scopes. Also
have to add reference operators now to be sure that only a single copy of
the image object is ever operated on per page load in PHP4.

Bug: 6219
Submitted by: Duck

The mother of all Ansel commits.  This removes all the gallery attributes
from the datatree, leaving only permissions and hierarchical information in
datatree.

To upgrade, first run the 2008_01_07_add_galleries.sql script to create
the gallery table and then run the sql_galleries.php script.  The script
does *NOT* delete any data from the datatree - it only creates the new
structure. Another (upcoming) upgrade script will remove the data from
the datatree once this is more thoroughly tested.

Bug: 6101

Happy New Year

Fix singular.

Standardize on using 'photos' instead of 'images'.

Try the best we can to get at least 5 related images. First try to match
all the same tags, then keep removing one tag from the search until we
get to either 5 images, or no tags.

Add a useful title to the image links

Add links to the "Similar Images" widget.

Initial attempt at a "similar images" widget for the image view.
This is bare-bones, currently just showing up to 5 mini-thumbs
of images containging the same tags as the current image.  Still
need to extend it to show both cuurent user and all users, add links
to the images, pretty up the layout etc...

Some more sanity checking, just in case.

- Show the number of images tagged with each tag in the list (for image view only right now, the rest to come)
- Add comment in Ansel_View_Image since I always forget we get some content from xrequest.php when we have js.

stray newline

Check for permissions from within Ansel_*::getTags() and Ansel_*::setTags()

Consolidate some logic, better permission checking

On second thought, only call Ansel_Tags::listTagInfo() where we need it, the rest of the time, just return the tag_id

Update exif data during image/slideshow view.
Probably needs some cleaning up, but this gets it working.
Bug: 5353

- Don't send an AJAX request if the tag field is empty
- Fix problem that caused images to be linked to a non-existant tag_id
- Protect against empty arrays being passed to Ansel_Galleries::getImages()

else if -> elseif

Guess we should also check perms here again in case someone tries to pass info directly to the xrequest.php script.

Make sure the current user has PERMS_EDIT before showing the add tags/remove tags links on the image and gallery views.

- Allow adding and removing tags directly from the tag display on the image and gallery views.
- use an <ul> for the tag list, since that's what it is...
- tweak css a bit

- Initially view only resources owned by the same owner as the image that the initial tag was choosen from.  Include a link to view all results.
- Put back the pager on the bottom of the page as well...can't remember why I commented that one out...hmmm.

- Add a title attribute to the remove tag link
- Tweak title text

This wasn't supposed to make it into the source tree.  I (along with my wife, who is a usability person) found the idea of 'related tags' confusing when viewing single images...

Add stub-file for the browse/search page and some phpdoc

- Add a "tag-trail" to the results page with ability to remove individual tags to widen the search...and add a "Related Tags" element to the results page to allow narrowing down of the images.

- Don't get the tags for the image in Ansel_Image since it is displayed again by the slideshow code in Ansel_View_Image

- Various code cleanup and tweaks

The UI elements probably still need to be tweaked, but this gets the general idea into HEAD.

Start fleshing out the UI for navigating tags.
This commit adds:
1) A tag display to the image view with clickable tags that will open in a..
2) Results view that displays all matching galleries and images similar to a gallery view.
3) Choosing an image to view from this page, and then clicking on one of it's tags will further narrow the search to include that tag
For now, the 'tag cache' is automatically cleared when navigating to either an image or gallery view from anywhere other than a tag link.

Still to come -

1) Display of 'related tags' for both single resources and the results view
2) Display of tags for galleries - the support for it is present, just need the UI elements
3) Breadcrumb-style navigation for tag search/browsing
4) Dedicated search (browse?) page to allow text searching and possibly a tag-cloud.

Also - renamed the comments.php file that served AJAX requests to xrequest.php since it also now serves tag requests...