/**

* Standard init function, sets block title and version number

*

* @return void

*/

public function init() {

$this->title = get_string('ajaxmarking', 'block_ajax_marking');

}

/**

* Standard specialization function

*

* @return void

*/

public function specialization() {

$this->title = get_string('marking', 'block_ajax_marking');

}

/**

* Standard get content function returns $this->content containing the block HTML etc

*

* @return bool|\stdClass

*/

public function get_content() {

global $CFG, $PAGE;

if (!isloggedin()) {

// Save all the DB stuff for the non-logged in front page.

return false;

}

$modclasses = block_ajax_marking_get_module_classes();

// If the user has switched role, we want to hide the block if the role would not normally

// see the block. Normally, we don't check at this level so that we can have overrides

// at module level.

if (!empty($PAGE->course->id) && is_role_switched($PAGE->course->id)) {

$canseeblock = false;

foreach ($modclasses as $mod) {

if (has_capability($mod->get_capability(), $PAGE->context)) {

$canseeblock = true;

}

if (!$canseeblock) {

return false;

}

}

}

if ($this->content !== null) {

return $this->content;

}

require_once($CFG->dirroot.'/blocks/ajax_marking/lib.php');

$courses = block_ajax_marking_get_my_teacher_courses();

if (count($courses) > 0) { // Grading permissions exist in at least one course, so display.

$this->content = new stdClass();

// Start building content output.

$this->content->footer = '';

$this->content->text = '<div id="block_ajax_marking">';

// Add a style to hide the HTML list and prevent flicker.

$this->content->text .= $this->anti_flicker_js();

// Add the basic HTML for the rest of the stuff to fit into.

$divs = '

<div id="block_ajax_marking_hidden">

<div id="dynamicicons">';

$divs .= $this->get_dynamic_icons_html();

$divs .= '

</div>

</div>

<div id="treetabs"></div>

<div id="block_ajax_marking_error"></div>';

$this->content->text .= $divs;

// Don't warn about javascript if the screenreader option is set - it was deliberate.

$noscript = '<noscript>

<p>'.

get_string('nojavascript', 'block_ajax_marking').

'</p>

</noscript>';

$this->content->text .= $noscript;

$this->content->text .= ' <div class="block_ajax_marking_spacer"></div>'.

'</div>'; // End of #block_ajax_marking container.

// Set things going.

$PAGE->requires->js_init_call('M.block_ajax_marking.initialise', array(), true,

$this->js_module());

// We need to append all of the plugin specific javascript. This file will be

// requested as part of a separate http request after the PHP has all been finished

// with, so we do this cheaply to keep overheads low by not using setup.php and

// having the js in static functions.

foreach (array_keys($modclasses) as $modname) {

$filename = '/blocks/ajax_marking/modules/'.$modname.'/'.$modname.'.js';

if (file_exists($CFG->dirroot.$filename)) {

$PAGE->requires->js($filename);

}

}

} else {

// No grading permissions in any courses - don't display the block (student). Exception.

// for when the block is just installed and the user can edit. Might look broken

// otherwise.

if (has_capability('moodle/course:manageactivities', $PAGE->context)) {

$this->content = new stdClass();

$this->content->text .= get_string('nogradedassessments', 'block_ajax_marking');

} else {

// This will stop the other functions like has_content() from running all the way

// through this again.

$this->content = false;

}

}

return $this->content;

}

/**

* Standard function - does the block allow configuration for specific instances of itself

* rather than site-wide?

*

* @return bool false

*/

public function instance_allow_config() {

return false;

}

/**

*

* We need a rendered icon for each node type. We can't rely on CSS to do this

* as there is no mechanism for generating it dynamically, i.e. having an arbitrary

* number of CSS rules generated, one for each module plugin. These icons are

* transplanted using JS to the nodes as needed.

*

* @return string HTML

*/

private function get_dynamic_icons_html() {

global $OUTPUT;

$modclasses = block_ajax_marking_get_module_classes();

$html = '';

foreach (array_keys($modclasses) as $modname) {

$html .= '<img id="block_ajax_marking_'.$modname.'_icon"

class="dynamicicon"

src="'.$OUTPUT->pix_url('icon', $modname).'"

alt="'.$modname.'"

title="'.$modname.'" />';

}

$html .= '<img id="block_ajax_marking_course_icon" class="dynamicicon"

src="'.$OUTPUT->pix_url('c/course').'"

alt="'.get_string('course').'"

title="'.get_string('course').'" />';

$html .= '<img id="block_ajax_marking_group_icon" class="dynamicicon"

src="'.$OUTPUT->pix_url('c/group').'"

alt="'.get_string('group').'"

title="'.get_string('group').'" />';

$html .= '<img id="block_ajax_marking_cohort_icon" class="dynamicicon"

src="'.$OUTPUT->pix_url('c/group').'"

alt="'.get_string('cohort', 'cohort').'"

title="'.get_string('cohort', 'cohort').'" />';

$html .= '<img id="block_ajax_marking_hide_icon" class="dynamicicon"

src="'.$OUTPUT->pix_url('t/hide').'"

alt="'.get_string('hide').'"

title="'.get_string('hide').'" />';

$html .= '<img id="block_ajax_marking_show_icon" class="dynamicicon"

src="'.$OUTPUT->pix_url('t/show').'"

alt="'.get_string('show').'"

title="'.get_string('show').'" />';

$html .= '<img id="block_ajax_marking_showgroups_icon" class="dynamicicon"

src="'.$OUTPUT->pix_url('group-disabled', 'block_ajax_marking').'"

alt="'.get_string('showgroups', 'block_ajax_marking').'"

title="'.get_string('showgroups', 'block_ajax_marking').'" />';

$html .= '<img id="block_ajax_marking_hidegroups_icon" class="dynamicicon"

src="'.$OUTPUT->pix_url('group', 'block_ajax_marking').'"

alt="'.get_string('hidegroups', 'block_ajax_marking').'"

title="'.get_string('hidegroups', 'block_ajax_marking').'" />';

return $html;

}

/**

* Provides the inline javascript to hide stuff whilst the page is loading, preventing

* flicker.

*

* @return string Script tag

*/

private function anti_flicker_js() {

return '<script type="text/javascript" defer="defer">

/* <![CDATA[ */

var styleElement = document.createElement("style");

styleElement.type = "text/css";

var hidehtml = "#block_ajax_marking_html_list, "+

"#treetabs, "+

"#totalmessage {display: none;}";

if (styleElement.styleSheet) {

styleElement.styleSheet.cssText = hidehtml;

} else {

styleElement.appendChild(document.createTextNode(hidehtml));

}

document.getElementsByTagName("head")[0].appendChild(styleElement);

/* ]]> */</script>';

}

/**

* Provides the definition for the javascript module for the page to include

*

* @return array

*/

private function js_module() {

// Set up the javascript module, with any data that the JS will need.

return array(

'name' => 'block_ajax_marking',

'fullpath' => '/blocks/ajax_marking/module.js',

'requires' => array('yui2-treeview',

'yui2-button',

'yui2-connection',

'yui2-json',

'yui2-container',

'yui2-menu',

'tabview',

'moodle-block_ajax_marking-coursestree',

'moodle-block_ajax_marking-cohortstree',

'moodle-block_ajax_marking-configtree'

),

'strings' => array(

array('totaltomark',

'block_ajax_marking'),

array('nogradedassessments',

'block_ajax_marking'),

array('nothingtomark',

'block_ajax_marking'),

array('refresh',

'block_ajax_marking'),

array('configure',

'block_ajax_marking'),

array('connectfail',

'block_ajax_marking'),

array('connecttimeout',

'block_ajax_marking'),

array('nogroups',

'block_ajax_marking'),

array('showthisactivity',

'block_ajax_marking'),

array('showthiscourse',

'block_ajax_marking'),

array('showwithgroups',

'block_ajax_marking'),

array('hidethisactivity',

'block_ajax_marking'),

array('hidethiscourse',

'block_ajax_marking'),

array('hidethiscourse',

'block_ajax_marking'),

array('show',

'block_ajax_marking'),

array('showgroups',

'block_ajax_marking'),

array('choosegroups',

'block_ajax_marking'),

array('recentitems',

'block_ajax_marking'),

array('mediumitems',

'block_ajax_marking'),

array('overdueitems',

'block_ajax_marking'),

array('errorcontactadmin',

'block_ajax_marking'),

array('recentitem',

'block_ajax_marking'),

array('mediumitem',

'block_ajax_marking'),

array('overdueitem',

'block_ajax_marking')

)

);

}