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Use the page context changes to display elements to properly set the next and previous buttons in an image display.

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The method 'display_context' returns the theme page values that depend on which context the item is being displayed.
This commit is contained in:
Tim Almdal 2011-08-13 22:54:18 -07:00
parent 53abda7602
commit ab4a8ea07e
3 changed files with 194 additions and 13 deletions
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33
3.0/modules/dynamic/controllers/dynamic.php
View File

@ -27,18 +27,25 @@ class Dynamic_Controller extends Controller {
private function _show($album) {
$page_size = module::get_var("gallery", "page_size", 9);
$page = Input::instance()->get("page", "1");
$album_defn = unserialize(module::get_var("dynamic", $album));
$display_limit = $album_defn->limit;
$children_count = ORM::factory("item")
->viewable()
->where("type", "!=", "album")
->count_all();
if (!empty($display_limit)) {
$children_count = min($children_count, $display_limit);
$input = Input::instance();
$show = $input->get("show");
if ($show) {
$child = ORM::factory("item", $show);
$index = dynamic::get_position($album_defn, $child);
if ($index) {
$page = ceil($index / $page_size);
url::redirect("dynamic/$album" . ($page == 1 ? "" : "?page=$page"));
}
} else {
$page = (int) $input->get("page", "1");
}
$children_count = dynamic::get_display_count($album_defn);
$offset = ($page - 1) * $page_size;
$max_pages = max(ceil($children_count / $page_size), 1);
@ -47,15 +54,15 @@ class Dynamic_Controller extends Controller {
throw new Kohana_404_Exception();
}
Display_Context::factory("dynamic")
->set(array("dynamic_type" => $album_defn, "path" => $album))
->save();
$template = new Theme_View("page.html", "collection", "dynamic");
$template->set_global("page", $page);
$template->set_global("page_size", $page_size);
$template->set_global("max_pages", $max_pages);
$template->set_global("children", ORM::factory("item")
->viewable()
->where("type", "!=", "album")
->order_by($album_defn->key_field, "DESC")
->find_all($page_size, $offset));
$template->set_global("children", dynamic::items($album_defn->key_field, $page_size, $offset));
$template->set_global("children_count", $children_count);
$template->content = new View("dynamic.html");
$template->content->title = t($album_defn->title);

118
3.0/modules/dynamic/helpers/dynamic.php Normal file
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@ -0,0 +1,118 @@
<?php defined("SYSPATH") or die("No direct script access.");/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2011 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
class dynamic_Core {
static function get_display_count($dynamic_type_definition) {
$display_limit = $dynamic_type_definition->limit;
$children_count = ORM::factory("item")
->viewable()
->where("type", "!=", "album")
->count_all();
if (!empty($display_limit)) {
$children_count = min($children_count, $display_limit);
}
return $children_count;
}
static function items($key_field, $limit=null, $offset=null) {
return ORM::factory("item")
->viewable()
->where("type", "!=", "album")
->order_by($key_field, "DESC")
->find_all($limit, $offset);
}
/**
* Find the position of the given item in the tag collection. The resulting
* value is 1-indexed, so the first child in the album is at position 1.
*
* @param Tag_Model $tag
* @param Item_Model $item
* @param array $where an array of arrays, each compatible with ORM::where()
*/
static function get_position($dynamic_type_definition, $item) {
$sort_column = $dynamic_type_definition->key_field;
$display_limit = self::get_display_count($dynamic_type_definition);
$query_model = ORM::factory("item");
// If the comparison column has NULLs in it, we can't use comparators on it
// and will have to deal with it the hard way.
$count = $query_model->viewable()
->where($sort_column, "IS", null)
->where("type", "!=", "album")
->count_all();
if (empty($count)) {
// There are no NULLs in the sort column, so we can just use it directly.
$position = $query_model->viewable()
->where($sort_column, ">", $item->$sort_column)
->where("type", "!=", "album")
->order_by(array($dynamic_type_definition->key_field => "DESC", "id" => "ASC"))
->count_all();
// We stopped short of our target value in the sort (notice that we're
// using a inequality comparator above) because it's possible that we have
// duplicate values in the sort column. An equality check would just
// arbitrarily pick one of those multiple possible equivalent columns,
// which would mean that if you choose a sort order that has duplicates,
// it'd pick any one of them as the child's "position".
//
// Fix this by doing a 2nd query where we iterate over the equivalent
// columns and add them to our position count.
foreach ($query_model->viewable()
->select("id")
->where($sort_column, "=", $item->$sort_column)
->where("type", "!=", "album")
->order_by(array("id" => "ASC"))
->find_all($display_limit) as $row) {
$position++;
if ($row->id == $item->id) {
break;
}
}
} else {
// There are NULLs in the sort column, so we can't use MySQL comparators.
// Fall back to iterating over every child row to get to the current one.
// This can be wildly inefficient for really large albums, but it should
// be a rare case that the user is sorting an album with null values in
// the sort column.
//
// Reproduce the children() functionality here using Database directly to
// avoid loading the whole ORM for each row.
$order_by = array($sort_column => "DESC", $order_by["id"] => "ASC");
$position = 0;
foreach ($query_model->viewable()
->select("id")
->where("parent_id", "=", $album->id)
->where("type", "!=", "album")
->order_by($order_by)
->find_all($display_limit) as $row) {
$position++;
if ($row->id == $item->id) {
break;
}
}
}
return $position;
}
}

56
3.0/modules/dynamic/libraries/Dynamic_Display_Context.php Normal file
View File

@ -0,0 +1,56 @@
<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2011 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
class Dynamic_Display_Context_Core extends Display_Context {
protected function __construct() {
parent::__construct("dynamic");
}
function display_context($item) {
$dynamic_type_definition = $this->get("dynamic_type");
$position = dynamic::get_position($dynamic_type_definition, $item);
if ($position > 1) {
list ($previous_item, $ignore, $next_item) = dynamic::items($dynamic_type_definition->key_field, 3, $position - 2);
} else {
$previous_item = null;
list ($next_item) = dynamic::items($dynamic_type_definition->key_field, 1, $position);
}
$root = item::root();
return array("position" =>$position,
"previous_item" => $previous_item,
"next_item" =>$next_item,
"sibling_count" => dynamic::get_display_count($dynamic_type_definition),
"breadcrumbs" => array(
Breadcrumb::instance($root->title, $root->url())->set_first(),
Breadcrumb::instance($dynamic_type_definition->title, $this->_url("show={$item->id}")),
Breadcrumb::instance($item->title, $item->url())->set_last()));
}
private function _url($query=null) {
$albumPath = $this->get("path");
$url = url::site("dynamic/$albumPath");
if ($query) {
$url .= "?$query";
}
return $url;
}
}