bug:2820 & bug:2684

add $conf['maxRequests']
perf enhanced : declare once {combine_script}
add one loading gif, fixed at the bottom right of the page
display an icon for picture loading, and an error icon if ajax failed : might need to be integrated in sprite.png
ToDo picture page/clean up unused loader gif/sleep above all.


git-svn-id: http://piwigo.org/svn/trunk@20161 68402e56-0260-453c-a942-63ccdbb3a9ee

include/category_cats.inc.php

@@ -387,6 +387,7 @@ if (count($categories) > 0)
   $derivative_params = trigger_event('get_index_album_derivative_params', ImageStdParams::get_by_type(IMG_THUMB) );
   $tpl_thumbnails_var_selection = trigger_event('loc_end_index_category_thumbnails', $tpl_thumbnails_var_selection);
   $template->assign( array(
+    'maxRequests' =>$conf['maxRequests'],
     'category_thumbnails' => $tpl_thumbnails_var_selection,
     'derivative_params' => $derivative_params,
     ) );

include/category_default.inc.php

@@ -153,6 +153,7 @@ foreach ($pictures as $row)
 
 $template->assign( array(
   'derivative_params' => trigger_event('get_index_derivative_params', ImageStdParams::get_by_type( pwg_get_session_var('index_deriv', IMG_THUMB) ) ),
+  'maxRequests' =>$conf['maxRequests'],
   'SHOW_THUMBNAIL_CAPTION' =>$conf['show_thumbnail_caption'],
     ) );
 $tpl_thumbnails_var = trigger_event('loc_end_index_thumbnails', $tpl_thumbnails_var, $pictures);

include/config_default.inc.php

@@ -769,4 +769,7 @@ $conf['chmod_value']= substr_compare(PHP_SAPI, 'apa', 0, 3)==0 ? 0777 : 0755;
 
 // 'small', 'medium' or 'large'
 $conf['derivative_default_size'] = 'medium';
+
+//Maximum Ajax requests at once, for thumbnails on-the-fly generation
+$conf['maxRequests']=3;
 ?>