developing a joomla 3.x component using rad/fof - joomladay uk 2014
DESCRIPTION
One of the new feature since Joomla 3.2 is Rapid Application Development (RAD) framework. A Joomla component is a PHP/MySQL web application that uses Joomla's framework. You can build your components on Joomla's framework and Joomla will take care of the database connection, the design (using templates), access levels, forms (JForms), etc. Using Joomla's framework saves you a lot of work and development time. However, it can be even faster! Most Joomla components include the same functionality: In the front-end a list of records from the database hyperlinked to pages with details of each record individually. In the back-end the component list records from the database, with a link to a form where you can change the data and save. Using the Rapid Application Development Framework (also known as FOF (Framework On Framework)) allows you to develop a component with common functionality with far fewer lines of code. In this presentation, Peter shows how you can use Joomla's RAD to build a simple Joomla component to manage locations and categories and present those on the front-end to visitors on a Google Map.TRANSCRIPT
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by Peter Martin www.db8.nl / @pe7er
Developing a Joomla Component using RAD/FOF
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>>> Sheets available: www.db8.nl <<<
>>> Component: https://github.com/pe7er/db8locate <<<
Overviewa)Introduction
b)Rapid Application Development (RAD) / FOF
c)Developing a Joomla component, back-end
d)Developing a Joomla component, front-end
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a) Introduction: Web Application● From scratch
– PHP/MySQL/HTML/CSS/JavaScript
● Joomla component: Joomla = Framework
– Database object
– Layout Template
– Access Control List (ACL)
– MVC → template overrides
– Plugins
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a) Functionality component back-end● Items - List
– Display list of items
– New / Edit an item
– Delete item(s)
– Publish/unpublish item(s)
● Category - List
– Display list of categories
– New / Edit a category
– Delete categories
– Publish/unpublish categories
● Category - Form
– Display form of a category
– Save a category
● Item - Form
– Display form of an item– Save an item
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a) Functionality component front-end● Items
– Display list of items
● Category
– Display list of categories
● Category
– Display category details
● Item
– Display item details
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b) Rapid Application Development (RAD)
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● Abstracting common code functionality● Conventions● Don’t Repeat Yourself (DRY)
● Nooku Framework ('Koowa') – Johan Janssens– Joomlatools extensies (DOCman), Anahita
● Framework on Framework – Nicholas Dionysopoulos– Basis of Akeeba Backup, Admin Tools etc
b) Software Development Framework
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Rapid Application Development (RAD)● RAD = Framework on Framework (since J 3.2)
– Extension of Joomla! Platform
– Backwards compatible
– Less code → faster development & less bugs
– Bootstrap
– Jquery
– JSON
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Rapid Application Development (RAD)● Convention over configuration ->
FOF convention:
● naming of functions● database field names
-> automatic (“automagic”) functionality
● How to use?
– XML → “configure” component using FOF
– PHP → more control over output
– Anything different? → Override / extend FOF code like models, controllers
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RAD/ FOF/ F0F ?● FOF (F O F)
– Akeeba etc
● RAD – FOF implementation– In Joomla core since 3.2
● F0F (F zero F) – Fork of FOF– Akeeba etc
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c) Joomla Component with FOF – back-end
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c) Joomla Component with FOF● Development Environment
– Local web environment (LAMP/XAMP/MAMP)
– phpMyAdmin
– Joomla 3.3.x installation
– Git (software version control) + github.com
– IDE for PHP:● Netbeans / PHPStorm / Eclipse / ”weapon of choice”
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“db8 locate” componentManage & display locations on a Google Map – Name: “db8 Locate”
– Component name: com_db8locate
– Database tabel name: #__db8locate_items
>>> Show example of back-end in browser
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1. basic component (back-end)
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1. basic component (back-end)1.Entry point
/administrator/components/com_db8locate/db8locate.php
2.Dispatcher configuration/administrator/components/com_db8locate/fof.xml
3.SQL definition of database table(s)/administrator/components/com_db8locate/sql/install/mysql/install.sql
4.XML installation manifest/administrator/components/com_db8locate/db8locate.xml
5.View: list/administrator/components/com_db8locate/views/items/tmpl/form.default.xml
6.View: form/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
7.Language files/administrator/components/com_db8locate/language/en-GB/en-GB.com_db8locate.sys.ini + en-GB.com_db8locate.ini
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1.1 basic component – entry point/administrator/components/com_db8locate/db8locate.php
<?phpdefined('_JEXEC') or die();
// Load FOFinclude_once JPATH_LIBRARIES.'/fof/include.php';
// Quit if FOF is not installedif(!defined('FOF_INCLUDED')) { JError::raiseError ('500', 'FOF is not installed');}
FOFDispatcher::getTmpInstance('com_db8locate')->dispatch();
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1.2 basic comp. – dispatcher config/administrator/components/com_db8locate/fof.xml
● <?xml version="1.0" encoding="UTF-8"?>● <fof>
● <backend>● <dispatcher>
● <option name="default_view">items</option></dispatcher>
● </backend>● </fof>
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1.3 basic component – SQL definition● Create SQL installation file:
/administrator/components/com_db8locate/sql/install/mysql/install.sql
install.sql contains:– CREATE TABLE, table name (plural):
#__db8locate_items
– ID field contains component- & fieldname (singular)db8locate_item_id (in Joomla: “id”)
– PRIMARY KEY (`db8locate_item_id`) = ID field
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1.3 basic component – SQL definition/administrator/components/com_db8locate/sql/install/mysql/install.sql
CREATE TABLE IF NOT EXISTS `#__db8locate_items` (● `db8locate_item_id` bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT,● `title` varchar(255) NOT NULL,● PRIMARY KEY (`db8locate_item_id`)● ) DEFAULT CHARSET=utf8;
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1.4 basic component – XML manifest 1/2/administrator/components/com_db8locate/db8locate.xml
<?xml version="1.0" encoding="utf-8"?><extension version="3.2" type="component" method="upgrade"> <name>db8 locate</name> <author>Peter Martin</author> <creationDate>12 September 2014</creationDate> <copyright>Copyright (C) 2014 Peter Martin / db8.nl</copyright> <license>GNU General Public License version 2</license> <authorEmail>[email protected]</authorEmail> <version>1.0.1</version> <description>Component to manage and display locations on a Google Map</description>
<!-- SQL query files to execute on installation --> <install>
● <sql>● <file driver="mysql" charset="utf8">sql/install/mysql/install.sql</file>● <file driver="mysql">sql/install/mysql/install.sql</file>●
● <file driver="mysqli" charset="utf8">sql/install/mysql/install.sql</file>● <file driver="mysqli">sql/install/mysql/install.sql</file>● </sql>● </install>
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1.4 basic component – XML manifest 2/2/administrator/components/com_db8locate/db8locate.xml
<!-- Administrator back-end section --> <administration> <!-- Administration menu --> <menu view="cpanel">COM_DB8LOCATE</menu>
<!-- Back-end files --> <files folder="backend"> <folder>sql</folder>
<filename>db8locate.php</filename> <filename>fof.xml</filename> </files>
</administration>
</extension>
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1.5 basic component – view list/administrator/components/com_db8locate/views/items/tmpl/form.default.xml
<?xml version="1.0" encoding="UTF-8"?>●
● <form type="browse"● show_header="1"● show_filters="1"● show_pagination="1"● norows_placeholder="COM_DB8LOCATE_COMMON_NORECORDS">● ● <headerset>● <header name="db8locate_item_id" type="rowselect" tdwidth="20" />● <header name="title" type="fieldsearchable" sortable="true"
buttons="yes" buttonclass="btn" />● </headerset>●
● <fieldset name="items">● <field name="db8locate_item_id" show_id="true" type="selectrow"/>● <field name="title" type="text" show_link="true" url="index.php?option=com_db8locate
&view=item&id=[ITEM:ID]" empty_replacement="(no title)" />● </fieldset>●
● </form>
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1.6 basic component – view form/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
<?xml version="1.0" encoding="UTF-8"?>●
● <form validate="true" serverside_validate="true">●
● <fieldset name="basic_configuration"● label="COM_DB8LOCATE_LOCATION_ITEM_EDIT"●
description="COM_DB8LOCATE_LOCATION_ITEM_EDIT_BASIC_DESC"● class="span4">● ● <field name="title" type="text"● class="inputbox"● label="JGLOBAL_TITLE"● required="true"● Size="50" />
● </fieldset>● </form>
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1. basic component – installation
Via Extensions > Extension Manager > Discover
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1. basic component (back-end)● List view
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1. basic component (back-end)● Form view
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1. basic component (back-end)● List view after couple of new & save
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2. language file
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2. language filesys.ini → For menu items etc.Put in /language/ map of db8locate component!
/administrator/components/com_db8locate/language/en-GB/en-GB.com_db8locate.sys.ini
●
COM_DB8LOCATE="db8 Locate"COM_DB8LOCATE_XML_DESCRIPTION="Component to manage and display locations on a Google Map"
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2. language file.ini → large file for all language lables com_db8locate
/administrator/components/com_db8locate/language/en-GB/en-GB.com_db8locate.ini
TIP: “Debug Language” & collect all “lables to translate”
COM_DB8LOCATE="db8 Locate"COM_DB8LOCATE_TITLE_ITEMS="Location Items"COM_DB8LOCATE_COMMON_NORECORDS="No Location Items"COM_DB8LOCATE_TITLE_ITEMS_EDIT="Edit Location Items"COM_DB8LOCATE_LOCATION_ITEM_EDIT="Location Items"COM_DB8LOCATE_LBL_ITEM_SAVED="Location Item saved"COM_DB8LOCATE_CONFIRM_DELETE="Delete Location Item?"
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2. language file
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3. switch on/off
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3. switch on/off – database fieldNew field “enabled” to store publication status
ALTER TABLE `#__db8locate_items` ADD `enabled` TINYINT( 3 ) NOT NULL DEFAULT '1';
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3. switch on/off – database field/administrator/components/com_db8locate/views/items/tmpl/form.default.xml
Add to <headerset>●
<header name="enabled" type="published" sortable="true" tdwidth="8%" />
●
● Add to <fieldset name="items">
● <field name="enabled" type="published"/>●
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3. switch on/off
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3. switch on/off – form/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
Add to <fieldset>●
<field name="enabled" type="list" label="JSTATUS"
● labelclass="todo-label"● class="inputbox"● filter="intval" size="1" default="1" >● <option value="1">JPUBLISHED</option>● <option value="0">JUNPUBLISHED</option>● </field>●
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3. switch on/off – form
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4. order
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4. order – database fieldNew database field “ordering”
ALTER TABLE `#__db8locate_items` ADD `ordering` INT( 11 ) NOT NULL DEFAULT '0';
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4. order – list/administrator/components/com_db8locate/views/items/tmpl/form.default.xml
Add to <headerset>●
<header name="ordering" type="ordering" sortable="true" tdwidth="10%" />
●
● Add to <fieldset name="items">
●
<field name="ordering" type="ordering" labelclass="order"/>●
●
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4. order
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5. categories
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5. categories – database fieldAdd new database field “catid” to store category_id
ALTER TABLE `#__db8locate_items` ADD `catid` INT( 10 ) UNSIGNED NOT NULL DEFAULT '0';
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5. categories – list/administrator/components/com_db8locate/views/items/tmpl/form.default.xml
Note: xml has hardcoded SQL for MySQL → should be model instead
Add to <headerset>●
<header name="category" type="category" sortable="true" tdwidth="10%" />
●
● Add to <fieldset name="items">
<field name="catid" type="sql" translate="false"query="SELECT * FROM #__categories" key_field="id" value_field="title" />
●
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5. categories – list
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5. categories – form/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
Add to <fieldset>●
<field name="catid" type="category"
● extension="com_db8locate"● class="inputbox"● label="JCATEGORY"● required="true"● size="1" /> ●
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5. categories – form
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5. categories – toolbar/administrator/components/com_db8locate/toolbar.php
● <?phpdefined('_JEXEC') or die();
class Db8locateToolbar extends FOFToolbar {
public function Db8locateHelperRenderSubmenu($vName) { return $this->renderSubmenu($vName); }
public function renderSubmenu($vName = null) { if (is_null($vName)) { $vName = $this->input->getCmd('view', 'cpanel'); } $this->input->set('view', $vName);
parent::renderSubmenu(); $toolbar = FOFToolbar::getAnInstance($this->input->getCmd('option',
'com_db8locate'), $this->config); $toolbar->appendLink(Jtext::_('COM_DB8LOCATE_SUBMENU_CATEGORIES'),
'index.php?option=com_categories&extension=com_db8locate', $vName == 'categories');
}}
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5. categories – toolbar
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5. categories – toolbar in Category ManagerCreate button in Category Manager to navigate back to “Items”:/administrator/components/com_db8locate/helpers/db8locate.php
● <?php● defined('_JEXEC') or die();●
● /**● * Helper to display db8 locate component submenus in com_categories● */● abstract class Db8locateHelper {●
● public static function addSubmenu($submenu) {JsubMenuHelper::addEntry(JText::_(
'COM_DB8LOCATE_TITLE_ITEMS'), 'index.php?option=com_db8locate', $submenu == 'locations');
JsubMenuHelper::addEntry(JText::_('COM_DB8LOCATE_SUBMENU_CATEGORIES'), 'index.php?option=com_categories&view=categories&extension=com_db8locate', $submenu == 'categories');
● }● }
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5. categories – Category Manager
Click on “Location Categories”, Result:
Warning: Invalid argument supplied for foreach() in /var/www/rad/libraries/cms/helper/content.php on line 121
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6. access levels
1. Access to application
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6. access levels application 1/2/administrator/components/com_db8locate/access.xml
● <?xml version="1.0" encoding="utf-8"?>● <access component="com_db8locate">● ● <section name="component">
● <action name="core.admin" title="JACTION_ADMIN"description="JACTION_ADMIN_COMPONENT_DESC" />
<action name="core.manage" title="JACTION_MANAGE" description="JACTION_MANAGE_COMPONENT_DESC" />
● <action name="core.create" title="JACTION_CREATE" description="JACTION_CREATE_COMPONENT_DESC" />
● <action name="core.delete" title="JACTION_DELETE" description="JACTION_DELETE_COMPONENT_DESC" />
● <action name="core.edit" title="JACTION_EDIT" description="JACTION_EDIT_COMPONENT_DESC" />
● <action name="core.edit.state" title="JACTION_EDITSTATE"
description="JACTION_EDITSTATE_COMPONENT_DESC" />● </section>
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6. access levels application 2/2/administrator/components/com_db8locate/access.xml
● <section name="category">● <action name="core.manage" title="JACTION_MANAGE"
description="JACTION_MANAGE_COMPONENT_DESC" />● <action name="core.create" title="JACTION_CREATE"
description="COM_CATEGORIES_ACCESS_CREATE_DESC" />● <action name="core.delete" title="JACTION_DELETE"
description="COM_CATEGORIES_ACCESS_DELETE_DESC" />● <action name="core.edit" title="JACTION_EDIT"
description="COM_CATEGORIES_ACCESS_EDIT_DESC" />● <action name="core.edit.state" title="JACTION_EDITSTATE"
description="COM_CATEGORIES_ ACCESS_EDITSTATE_DESC" />
● </section>●
● </access>
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6. access levels
2. (Front-end) access to database items
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6. access levels – list
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7. parameters
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7. parameters/administrator/components/com_db8locate/config.xmlvia Components > db8 locate > categories > [options]
● <?xml version="1.0" encoding="UTF-8"?>● <config>●
● <fieldset name="permissions"● label="JCONFIG_PERMISSIONS_LABEL"● description="JCONFIG_PERMISSIONS_DESC" >●
● <field name="rules"● type="rules"● label="JCONFIG_PERMISSIONS_LABEL"● class="inputbox"● filter="rules"● component="com_db8locate"● section="component" />●
● </fieldset>●
● </config>
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8. multilingual
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8. multilingual – database fieldAdd new field “language” to store language code
ALTER TABLE `#__db8locate_items` ADD `language` CHAR( 7 ) NOT NULL DEFAULT '*';
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8. multilingual – list/administrator/components/com_db8locate/views/items/tmpl/form.default.xml
Add to <headerset>●
<header name="language" type="language" sortable="true" tdwidth="10%" />
●
●
● Add to <fieldset name="items">
<field name="language" type="text" tdwidth="10%" />●
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8. multilingual – form/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
Add to <fieldset>●
<field name="language" type="contentlanguage"
label="JFIELD_LANGUAGE_LABEL" >● <option value="*">JALL</option>● </field> ● ●
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8. multilingual – form/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
Add to <fieldset>●
<field name="language" type="contentlanguage"
label="JFIELD_LANGUAGE_LABEL" >● <option value="*">JALL</option>● </field> ● ●
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8. multilingual – list
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9. “magic fields”
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9. “magic fields”● Present in component:
enabled (“state”), ordering,
● Also add to database table: created_by, created_on(“created”), modified_by, modified_on(“modified”), locked_by(“checked_out”), locked_on(“checked_out_time”), hits
● In list view: created_by & created_on● In form view: all fields
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10. tags
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10. tags
#__tags tabel stores tags:
id title4 Joomla5 Linux
#__contentitem_tag_map links content items and tags:
type_alias core_content_id content_item_id tag_id type_idcom_content.article 1 1 2 1com_content.article 1 1 3 1com_content.article 3 2 4 1com_content.article 3 2 5 1com_weblinks.weblink 2 1 4 2com_weblinks.weblink 2 1 5 2
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10. tags – form/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
Add to <fieldset>●
<field name="tags" type="tag" label="JTAG" description="JTAG_DESC" class="inputbox span12" multiple="true" >
</field>
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10. tags
Unfortunately ... not working... bug in Joomla to versie 3.2.3: Use of com_tags only possible if JTable is used in component.
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11. my own fields...
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11. db8locate – database fieldAdd your own fields to database
ALTER TABLE `jos_db8locate_items` ● ADD `location` VARCHAR( 60 ) NOT NULL ,● ADD `address` VARCHAR( 50 ) NOT NULL ,● ADD `postcode` VARCHAR( 12 ) NOT NULL ,● ADD `city` VARCHAR( 50 ) NOT NULL ,● ADD `region` VARCHAR( 50 ) NOT NULL ,● ADD `country` VARCHAR( 50 ) NOT NULL ,● ADD `latitude` VARCHAR( 10 ) NOT NULL ,● ADD `longitude` VARCHAR( 10 ) NOT NULL ,● ADD `website` VARCHAR( 100 ) NOT NULL
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11. db8locate – list
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11. db8locate – further improvements● Update your SQL installation script:
/administrator/components/com_db8locate/sql/install/mysql/install.sql
● If "required fields" are not completed, then "save" results in emptying the fields...
/administrator/components/com_db8locate/models/items.php●
class Db8directoryModelItems extends F0Fmodel {● protected $_savestate = 1;● protected function loadFormData() {● Jfactory::getApplication()->● setUserState('com_db8locate.add.item.data', '');●
●
● if (empty($this->_formData)) {● return array();● } else {● return $this->_formData;● }● }● }
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11. db8locate – further improvements● Edit form too long → divide into columns
/administrator/components/com_db8locate/views/item/tmpl/form.form.xml
/administrator/components/com_db8locate/views/item/tmpl/form.form.xml●
<fieldset name="basic_configuration" label="COM_DB8LOCATE_ITEM_LOCATION" class="span4"> fields in column 1 </fieldset>
●
● <fieldset name="address" label="COM_DB8LOCATE_ITEM_ADDRESS" class="span4"> fields in column 2 </fieldset>
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11. db8locate – further improvements● Lookup Coordinates of each Address at Google Maps API
– Add lookup code for Google Map API in Model
– Add button in Toolbar
– Add handling in Controller
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d) Joomla Component with FOF – front-end
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12. basic component (front-end)1.Entry point
/components/com_db8locate/db8locate.php
2.View: list/components/com_db8locate/views/items/tmpl/form.default.xml/components/com_db8locate/views/items/metadata.xml –> for menu
3.View: single item/components/com_db8locate/views/item/tmpl/form.item.xml/components/com_db8locate/views/item/metadata.xml –> for menu
4.Language files/components/com_db8locate/language/en-GB/en-GB.com_db8locate.ini
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12.1 front-end – entry point/administrator/components/com_db8locate/db8locate.php
<?phpdefined('_JEXEC') or die();
// Load FOFinclude_once JPATH_LIBRARIES.'/fof/include.php';
// Quit if FOF is not installedif(!defined('FOF_INCLUDED')) { JError::raiseError ('500', 'FOF is not installed');}
FOFDispatcher::getTmpInstance('com_db8locate')->dispatch();
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12.2 front-end – view list/components/com_db8locate/views/items/tmpl/form.default.xml
<?xml version="1.0" encoding="UTF-8"?><form type="browse" show_header="1" show_filters="0" show_pagination="1" show_enabled="1" norows_placeholder="COM_DB8LOCATE_COMMON_NORECORDS" > <headerset> <header name="title" type="fieldsearchable" sortable="true"buttons="true" /> <header name="city" type="fieldsearchable" sortable="true"buttons="false" /> <header name="region" sortable="true"buttons="false" /> <header name="country" sortable="true"buttons="false" tdwidth="20%" /> <header name="category" sortable="false"buttons="false" /> </headerset>
<fieldset name="items"> <field name="title" type="text" show_link="true" url="index.php?option=com_db8locate&view=item&id=[ITEM:ID]" class="todoitem" empty_replacement="(no title)" />
<field name="city" type="text" /> <field name="region" type="text" /> <field name="country" type="text" /> <field name="catid" type="sql" translate="false" query="SELECT * FROM #__categories" key_field="id" value_field="title"/> </fieldset></form>
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12.2 front-end – view list
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12.3 front-end – view details/components/com_db8locate/views/item/tmpl/form.item.xml
<?xml version="1.0" encoding="utf-8"?>● <form● type="read">● ● <fieldset name="a_single_item" class="item-container form-horizontal">● <field name="title" type="text"● label="COM_DB8LOCATE_TITLE"● class="db8locate-title-field"● size="50"/>●
● <field name="city" type="text"● label="COM_DB8LOCATE_CITY"● labelclass="db8locate-field"● size="20" />●
● <field name="website" type="text"● label="COM_DB8LOCATE_WEBSITE"● labelclass="db8locate-field"● size="40" />● ● </fieldset>● </form>
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12.3 front-end – view details
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12.4 language files
/components/com_db8locate/language/en-GB/en-GB.com_db8locate.ini
TIP: “Debug Language” & collect all “lables to translate”
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13. more views
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13. more viewsCombine XML & PHP/components/com_db8locate/views/items/tmpl/default.phpand load form.default.xml
E.g. mix with Google Maps
<?php$viewTemplate = $this->getRenderedForm();echo $viewTemplate;?>
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13. more views – mixed php & xml
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13. more viewsExtra (built-in) output options:
&format=csvadministrator/index.php?option=com_db8locate&format=csv
&format=jsonadministrator/index.php?option=com_db8locate&format=json
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d) tools
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Errors● IMHO Harder to detect than "regular" Joomla
component!● Cache!!● Debug
– E.g. back-end error: “An error has occurred. 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER BY node.lft' at line 4 SQL=SELECT node.id FROM jos_categories AS node, jos_categories AS parent WHERE node.lft BETWEEN parent.lft AND parent.rgt AND parent.id = ORDER BY node.lft”
can be caused by error in the front-end!Test: rename front-end com_db8locate temporary
– Front-end error:Notice: Undefined variable: form_class in /var/www/rad/libraries/fof/render/strapper.php on line 676
Test: rebuilt .xml files step-by-step
– print_r($object) / echo $query / die(“stop here!”)
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Sources● Documentation
https://www.akeebabackup.com/documentation/fof.html
● FOF Mailinglist: https://groups.google.com/forum/#!forum/frameworkonframework
● Source code Github: https://github.com/akeeba/fof
● Examples:https://github.com/akeeba/todo-fof-example/ https://github.com/akeeba/contactus Akeeba Backup, Akeeba Ticket Systemhttps://github.com/tuum/com_timesheet
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ContactPresentation available at:http://www.db8.nl
Component db8locate available at:https://github.com/pe7er/db8locate
Peter Martin
e-mail: info at db8.nl
website: www.db8.nl
twitter: @pe7er
Review this presentation: https://joind.in/talk/view/11625
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Used Photos 1/2● Speed Typing - Matthew Bowden http://www.sxc.hu/photo/275499
● Speedometer – Abdulhamid AlFadhly http://www.sxc.hu/photo/1390189
● LONDON SKYLINE CLIP ART http://www.clker.com/clipart-london-skyline-19.html
● Forjados 1 - Albert Lazcano http://www.sxc.hu/photo/626785
● Bengali Keyborad - Mohammad Jobaed Adnan http://www.sxc.hu/photo/676844
● Old Light Switches - Paul Cross http://www.sxc.hu/photo/1259922
● madera en pila 1 - jean froidevaux http://www.sxc.hu/photo/313864
● Books books books... - Brandon Blinkenberg http://www.sxc.hu/photo/424027
● Sign 3: forbidden access - Davide Guglielmo http://www.sxc.hu/photo/200982
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Used Photos 2/2● Communications Receiver - John Munsch http://www.sxc.hu/photo/260775
● Flags of the Baltic Sea countries - Johannes Raitio http://www.sxc.hu/photo/471547
● Lock - Robert Linder http://www.sxc.hu/photo/1395379
● Basho Collage 5 - Billy Alexander http://www.sxc.hu/photo/1330749
● Earth: Night Edition - Europe - Sigurd Decroos http://www.sxc.hu/photo/140879
● Retro/Vintage TV set - "meltingdog" http://www.sxc.hu/photo/1440150
● san sebastian views 1 - ibon san martin http://www.sxc.hu/photo/94018
● Tools - J Boontje http://www.sxc.hu/photo/805571
● The End Book, EWikist, 2010 http://commons.wikimedia.org/wiki/File:The_End_Book.png