This page lists the technical changes that may be useful for plugin and theme developpers to make their extension compatible with Piwigo 2.2.

If the adminstration main page of your plugin is plugins/plugin_directory/admin.php, then you can simplify the URL of your plugin in the main.inc.php from this:

add_event_handler('get_admin_plugin_menu_links', 'localfiles_admin_menu');
function localfiles_admin_menu($menu)
{
  array_push(
    $menu,
    array(
      'NAME' => 'LocalFiles Editor',
      'URL' => get_admin_plugin_menu_link(LOCALEDIT_PATH . 'admin.php')
      )
    );
 
  return $menu;
}

into this:

add_event_handler('get_admin_plugin_menu_links', 'localfiles_admin_menu');
function localfiles_admin_menu($menu)
{
  array_push(
    $menu,
    array(
      'NAME' => 'LocalFiles Editor',
      'URL' => get_root_url().'admin.php?page=plugin-'.basename(dirname(__FILE__))
      )
    );
 
  return $menu;
}

• admin.php?page=plugin&section=LocalFilesEditor%2Fadmin.php (ugly) in Piwigo 2.1
• admin.php?page=plugin-LocalFilesEditor (nice) in Piwigo 2.2

Even better, if you have several tabs on your plugin administration screen, you can append -tabName in the “page” URL parameter.

• admin.php?page=plugin&section=LocalFilesEditor%2Fadmin.php&tab=css (ugly) in Piwigo 2.1
• admin.php?page=plugin-LocalFilesEditor-css (nice) in Piwigo 2.2

Starting from Piwigo 2.2, it is possible to run several photo galleries with the same installation of Piwigo, this is a basic multisite feature and each site has its own $conf['local_dir']

If you use the ./local directory to store your theme/plugin configuration, I suggest to move configuration to the “config” table which does a very good job. If you want to keep configuration in a separate file, don't hard code the “local” directory, use the PWG_LOCAL_DIR constant instead.

Piwigo 2.1:

include(PHPWG_ROOT_PATH.'local/config/my_plugin.inc.php');

Piwigo 2.2:

include(PHPWG_ROOT_PATH.PWG_LOCAL_DIR.'config/my_plugin.inc.php');

Because it was not that useful and had impact on many files, we've decided to remove the Adviser mode. In your PHP files, remove the:

if (is_adviser())

and in the TPL files, remove the:

{$TAG_INPUT_ENABLED}

The function is_adviser() is deprecated but not removed : it will always return false.

In your register.tpl file, add:

<input type="hidden" name="key" value="{$F_KEY}" >

See themes/default/template/register.tpl for details

To reduce the number of HTTP requests from the visitor web browser to the web server, we use the new “combine_css” method, which merge several CSS files into a single one, minified.

Piwigo 2.1

{html_head}<link rel="stylesheet" type="text/css" href="{$LOCALEDIT_PATH}locfiledit.css">{/html_head}

Piwigo 2.2

{combine_css path="plugins/LocalFilesEditor/locfiledit.css"}

For coding steps, before releasing your theme/plugin, you can deactivate the combine_css feature :

$conf['template_combine_files'] = false;

If you have a specific header.tpl in your theme, add get_combined_css.

Piwigo 2.1

{foreach from=$themes item=theme}
  {if $theme.load_css}
<link rel="stylesheet" type="text/css" href="{$ROOT_URL}themes/{$theme.id}/theme.css">
  {/if}
  {if !empty($theme.local_head)}{include file=$theme.local_head}{/if}
{/foreach}

Piwigo 2.2

{get_combined_css}
{combine_css path="themes/simple/content.css" order="-10"}
{foreach from=$themes item=theme}
  {if $theme.load_css}
{combine_css path="themes/`$theme.id`/theme.css" order=-10}
  {/if}
  {if !empty($theme.local_head)}{include file=$theme.local_head load_css=$theme.load_css}{/if}
{/foreach}

If you have a specific header.tpl, in the HTML head, add:

{get_combined_scripts load='header'}

If you have a specific footer.tpl, before the end of HTML body, add:

{get_combined_scripts load='footer'}

To reduce the number of HTTP requests from the visitor web browser to the web server, we use the new “combine script” method, which merge several javascript files into a single one, minified.

{combine_script id='core.scripts' load='async' path='themes/default/js/scripts.js'}
{combine_script id='rating' load='async' require='core.scripts' path='themes/default/js/rating.js'}
{combine_script id='jquery' path='themes/default/js/jquery.min.js'}
{combine_script id='jquery.cluetip' load='async' require='jquery' path='themes/default/js/plugins/jquery.cluetip.js'}
 
{combine_script id="jquery" load="async"}
{combine_script id="jquery.ui" load="async"}
{combine_script id="jquery.ui.draggable" load="async"}

• id : a string that makes the javascript file unique
• load : header/footer/async. header and footer values means the javascript file need to be loaded by the web browser to display the page. Try to use “async” if possible, to speed up page display. For example Google Analytics javascript could be “async”.
• require : the id of the parent javascript file. You can define several ids, separated by commas : “jquery, jquery.ui,my_script”
• path : relative to the “root url” of your gallery

Note: the “require” argument is optionnal for jquery, jquery.ui, jquery.effects all jquery plugins jquery.ui.xxxx or jquery.effects.xxxx. The “path” is optionnal is the javascript file can be found under themes/default/js/ui.

To write javascript code inside your template (with dependencies on one or several javascript files)

{footer_script require='jquery.ui.xxxx'}{literal}
jQuery(document).ready(function() {
  alert("This is a test");
});
{/literal}{/footer_script}

No need to have a “require” in your footer_script. You can have a piece of javascript code in your template file that you want to be executed at the end of the page, like this:

{footer_script}{literal}
alert("This is a test");
{/literal}{/footer_script}

Piwigo 2.1:

{known_script id="jquery.fcbkcomplete" src=$ROOT_URL|@cat:"themes/default/js/plugins/jquery.fcbkcomplete.js"}
{literal}
<script type="text/javascript">
  $(document).ready(function() {
    $("#tags").fcbkcomplete({
      json_url: "admin.php?fckb_tags=1",
      cache: false,
      filter_case: false,
      filter_hide: true,
      firstselected: true,
      filter_selected: true,
      maxitems: 100,
      newel: true
    });
  });
</script>
{/literal}

Piwigo 2.2:

{combine_script id='jquery.fcbkcomplete' load='footer' require='jquery' path='themes/default/js/plugins/jquery.fcbkcomplete.js'}
 
{footer_script require='jquery.fcbkcomplete'}{literal}
jQuery(document).ready(function() {
  jQuery("#tags").fcbkcomplete({
    json_url: "admin.php?fckb_tags=1",
    cache: false,
    filter_case: false,
    filter_hide: true,
    firstselected: true,
    filter_selected: true,
    maxitems: 100,
    newel: true
  });
});
{/literal}{/footer_script}

Piwigo 2.1:

{known_script id="jquery" src=$ROOT_URL|@cat:"themes/default/js/jquery.packed.js"}
{known_script id="jquery.ui" src=$ROOT_URL|@cat:"themes/default/js/ui/packed/ui.core.packed.js" }
{known_script id="jquery.ui.sortable" src=$ROOT_URL|@cat:"themes/default/js/ui/packed/ui.sortable.packed.js" }
 
{literal}
<script type="text/javascript">
jQuery().ready(function(){
  jQuery(".catPos").hide();
  jQuery(".drag_button").show();
  jQuery(".categoryLi").css("cursor","move");
  jQuery(".categoryUl").sortable({
    axis: "y",
    opacity: 0.8
  });
});
</script>
{/literal}

Piwigo 2.2:

{footer_script require='jquery.ui.sortable'}{literal}
jQuery(document).ready(function() {
  jQuery(".catPos").hide();
  jQuery(".drag_button").show();
  jQuery(".categoryLi").css("cursor","move");
  jQuery(".categoryUl").sortable({
    axis: "y",
    opacity: 0.8
  });
});
{/literal}{/footer_script}

No need to use combine_script, because Piwigo will automatically load jquery.ui.sortable, which automatically requires jquery.ui which automatically requires jquery. It works because jquery.ui.sortable is available in themes/default/js/ui

CSS sprites are a way to reduce the number of HTTP requests made for image resources referenced by your site. Images are combined into one larger image. Instead of performing an HTTP request for each icon of a page, the web browser only performs a single request to get all icons at once. Read more on CSS Sprites: Image Slicing’s Kiss of Death.

1) start the Gimp

2) open themes/default/s26/outline_ff3363.png (with the pink icons)

3) switch to RGB Mode : Image > Mode > RGB

4) in the Toolbox pane, make sure you have the “Rectangle Select Tool” active

5) create a new layer, on top of the background (which includes the icons) and select it

6) open your icon home.png, Select > All (Ctrl+a), Edit > Copy (Ctrl+c)

7) focus on the sprite window

8) Edit > Paste and move the floating selection with the mouse cursor, your home icon must be on top of the default home icon

9) click outside the current selection, the pasted icon will be merged into the “New Layer”

10) reproduce steps 6 to 9 for each icon of the sprite

11) select the “Background” layer in the “Layers” pane (but don't hide the “New Layer”)

12) in the image window, select each icon you have replaced and press “suppr” on your keyboard, this will delete the background, ie the default icon

13) save the file as themes/yourTheme/icon/icons_sprite.png (use option “Merge visible layers” when saving)

Now you have a sprite with all your icons, let's declare it in the theme.css of your theme. Open your theme.css and write:

.pwg-icon {
  background-image: url(icon/icons_sprite.png);
}
 
A:hover .pwg-icon {
  background-image: url(icon/icons_sprite.png);
}

Open your web browser and check the icons are correctly displayed. If you have problems like alignment, reopen icons_sprite.png, select the icon with the Rectangle Select Tool, Edit>Cut (Ctrl+x), Edit>Paste (Ctrl+v) and move it up/down/right/left with arrows on your keyboard, save file and check in your web browser.

One thing really nice with the new system to display icons is the ability to have a distinct icon for a:hover (when the mouse cursor is on the icon). For this example, I've decided to have my icons grey by default and colored when cursor is over it.

1) copy icons_sprite.png as icons_sprite_hover.png

2) modify your themes.css as follows

.pwg-icon {
  background-image: url(icon/icons_sprite.png);
}
 
A:hover .pwg-icon {
  background-image: url(icon/icons_sprite_hover.png);
}

3) open icons_sprite.png with the Gimp

4) Image > Mode > Grayscale

5) save and see the nice result in your web browser