public function add_block_at_end_of_default_region($blockname)
 {
     $defaulregion = $this->get_default_region();
     $lastcurrentblock = end($this->birecordsbyregion[$defaulregion]);
     if ($lastcurrentblock) {
         $weight = $lastcurrentblock->weight + 1;
     } else {
         $weight = 0;
     }
     if ($this->page->subpage) {
         $subpage = $this->page->subpage;
     } else {
         $subpage = null;
     }
     // Special case. Course view page type include the course format, but we
     // want to add the block non-format-specifically.
     $pagetypepattern = $this->page->pagetype;
     if (strpos($pagetypepattern, 'course-view') === 0) {
         $pagetypepattern = 'course-view-*';
     }
     // We should end using this for ALL the blocks, making always the 1st option
     // the default one to be used. Until then, this is one hack to avoid the
     // 'pagetypewarning' message on blocks initial edition (MDL-27829) caused by
     // non-existing $pagetypepattern set. This way at least we guarantee one "valid"
     // (the FIRST $pagetypepattern will be set)
     // We are applying it to all blocks created in mod pages for now and only if the
     // default pagetype is not one of the available options
     if (preg_match('/^mod-.*-/', $pagetypepattern)) {
         $pagetypelist = generate_page_type_patterns($this->page->pagetype, null, $this->page->context);
         // Only go for the first if the pagetype is not a valid option
         if (is_array($pagetypelist) && !array_key_exists($pagetypepattern, $pagetypelist)) {
             $pagetypepattern = key($pagetypelist);
         }
     }
     // Surely other pages like course-report will need this too, they just are not important
     // enough now. This will be decided in the coming days. (MDL-27829, MDL-28150)
     $this->add_block($blockname, $defaulregion, $weight, false, $pagetypepattern, $subpage);
 }

 /**
  * Handle deleting a block.
  * @return boolean true if anything was done. False if not.
  */
 public function process_url_delete()
 {
     global $CFG, $PAGE, $OUTPUT;
     $blockid = optional_param('bui_deleteid', null, PARAM_INT);
     $confirmdelete = optional_param('bui_confirm', null, PARAM_INT);
     if (!$blockid) {
         return false;
     }
     require_sesskey();
     $block = $this->page->blocks->find_instance($blockid);
     if (!$this->user_can_delete_block($block)) {
         throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('deleteablock'));
     }
     if (!$confirmdelete) {
         $deletepage = new moodle_page();
         $deletepage->set_pagelayout('admin');
         $deletepage->set_course($this->page->course);
         $deletepage->set_context($this->page->context);
         if ($this->page->cm) {
             $deletepage->set_cm($this->page->cm);
         }
         $deleteurlbase = str_replace($CFG->wwwroot . '/', '/', $this->page->url->out_omit_querystring());
         $deleteurlparams = $this->page->url->params();
         $deletepage->set_url($deleteurlbase, $deleteurlparams);
         $deletepage->set_block_actions_done();
         // At this point we are either going to redirect, or display the form, so
         // overwrite global $PAGE ready for this. (Formslib refers to it.)
         $PAGE = $deletepage;
         //some functions like MoodleQuickForm::addHelpButton use $OUTPUT so we need to replace that too
         $output = $deletepage->get_renderer('core');
         $OUTPUT = $output;
         $site = get_site();
         $blocktitle = $block->get_title();
         $strdeletecheck = get_string('deletecheck', 'block', $blocktitle);
         $message = get_string('deleteblockcheck', 'block', $blocktitle);
         // If the block is being shown in sub contexts display a warning.
         if ($block->instance->showinsubcontexts == 1) {
             $parentcontext = context::instance_by_id($block->instance->parentcontextid);
             $systemcontext = context_system::instance();
             $messagestring = new stdClass();
             $messagestring->location = $parentcontext->get_context_name();
             // Checking for blocks that may have visibility on the front page and pages added on that.
             if ($parentcontext->id != $systemcontext->id && is_inside_frontpage($parentcontext)) {
                 $messagestring->pagetype = get_string('showonfrontpageandsubs', 'block');
             } else {
                 $pagetypes = generate_page_type_patterns($this->page->pagetype, $parentcontext);
                 $messagestring->pagetype = $block->instance->pagetypepattern;
                 if (isset($pagetypes[$block->instance->pagetypepattern])) {
                     $messagestring->pagetype = $pagetypes[$block->instance->pagetypepattern];
                 }
             }
             $message = get_string('deleteblockwarning', 'block', $messagestring);
         }
         $PAGE->navbar->add($strdeletecheck);
         $PAGE->set_title($blocktitle . ': ' . $strdeletecheck);
         $PAGE->set_heading($site->fullname);
         echo $OUTPUT->header();
         $confirmurl = new moodle_url($deletepage->url, array('sesskey' => sesskey(), 'bui_deleteid' => $block->instance->id, 'bui_confirm' => 1));
         $cancelurl = new moodle_url($deletepage->url);
         $yesbutton = new single_button($confirmurl, get_string('yes'));
         $nobutton = new single_button($cancelurl, get_string('no'));
         echo $OUTPUT->confirm($message, $yesbutton, $nobutton);
         echo $OUTPUT->footer();
         // Make sure that nothing else happens after we have displayed this form.
         exit;
     } else {
         blocks_delete_instance($block->instance);
         // bui_deleteid and bui_confirm should not be in the PAGE url.
         $this->page->ensure_param_not_in_url('bui_deleteid');
         $this->page->ensure_param_not_in_url('bui_confirm');
         return true;
     }
 }

 function definition()
 {
     $mform =& $this->_form;
     // First show fields specific to this type of block.
     $this->specific_definition($mform);
     // Then show the fields about where this block appears.
     $mform->addElement('header', 'whereheader', get_string('wherethisblockappears', 'block'));
     // If the current weight of the block is out-of-range, add that option in.
     $blockweight = $this->block->instance->weight;
     $weightoptions = array();
     if ($blockweight < -block_manager::MAX_WEIGHT) {
         $weightoptions[$blockweight] = $blockweight;
     }
     for ($i = -block_manager::MAX_WEIGHT; $i <= block_manager::MAX_WEIGHT; $i++) {
         $weightoptions[$i] = $i;
     }
     if ($blockweight > block_manager::MAX_WEIGHT) {
         $weightoptions[$blockweight] = $blockweight;
     }
     $first = reset($weightoptions);
     $weightoptions[$first] = get_string('bracketfirst', 'block', $first);
     $last = end($weightoptions);
     $weightoptions[$last] = get_string('bracketlast', 'block', $last);
     $regionoptions = $this->page->theme->get_all_block_regions();
     foreach ($this->page->blocks->get_regions() as $region) {
         // Make sure to add all custom regions of this particular page too.
         if (!isset($regionoptions[$region])) {
             $regionoptions[$region] = $region;
         }
     }
     $parentcontext = context::instance_by_id($this->block->instance->parentcontextid);
     $mform->addElement('hidden', 'bui_parentcontextid', $parentcontext->id);
     $mform->setType('bui_parentcontextid', PARAM_INT);
     $mform->addElement('static', 'bui_homecontext', get_string('createdat', 'block'), $parentcontext->get_context_name());
     $mform->addHelpButton('bui_homecontext', 'createdat', 'block');
     // For pre-calculated (fixed) pagetype lists
     $pagetypelist = array();
     // parse pagetype patterns
     $bits = explode('-', $this->page->pagetype);
     // First of all, check if we are editing blocks @ front-page or no and
     // make some dark magic if so (MDL-30340) because each page context
     // implies one (and only one) harcoded page-type that will be set later
     // when processing the form data at {@link block_manager::process_url_edit()}
     // There are some conditions to check related to contexts
     $ctxconditions = $this->page->context->contextlevel == CONTEXT_COURSE && $this->page->context->instanceid == get_site()->id;
     // And also some pagetype conditions
     $pageconditions = isset($bits[0]) && isset($bits[1]) && $bits[0] == 'site' && $bits[1] == 'index';
     // So now we can be 100% sure if edition is happening at frontpage
     $editingatfrontpage = $ctxconditions && $pageconditions;
     // Let the form to know about that, can be useful later
     $mform->addElement('hidden', 'bui_editingatfrontpage', (int) $editingatfrontpage);
     $mform->setType('bui_editingatfrontpage', PARAM_INT);
     // Front page, show the page-contexts element and set $pagetypelist to 'any page' (*)
     // as unique option. Processign the form will do any change if needed
     if ($editingatfrontpage) {
         $contextoptions = array();
         $contextoptions[BUI_CONTEXTS_FRONTPAGE_ONLY] = get_string('showonfrontpageonly', 'block');
         $contextoptions[BUI_CONTEXTS_FRONTPAGE_SUBS] = get_string('showonfrontpageandsubs', 'block');
         $contextoptions[BUI_CONTEXTS_ENTIRE_SITE] = get_string('showonentiresite', 'block');
         $mform->addElement('select', 'bui_contexts', get_string('contexts', 'block'), $contextoptions);
         $mform->addHelpButton('bui_contexts', 'contexts', 'block');
         $pagetypelist['*'] = '*';
         // This is not going to be shown ever, it's an unique option
         // Any other system context block, hide the page-contexts element,
         // it's always system-wide BUI_CONTEXTS_ENTIRE_SITE
     } else {
         if ($parentcontext->contextlevel == CONTEXT_SYSTEM) {
             $mform->addElement('hidden', 'bui_contexts', BUI_CONTEXTS_ENTIRE_SITE);
         } else {
             if ($parentcontext->contextlevel == CONTEXT_COURSE) {
                 // 0 means display on current context only, not child contexts
                 // but if course managers select mod-* as pagetype patterns, block system will overwrite this option
                 // to 1 (display on current context and child contexts)
                 $mform->addElement('hidden', 'bui_contexts', BUI_CONTEXTS_CURRENT);
             } else {
                 if ($parentcontext->contextlevel == CONTEXT_MODULE or $parentcontext->contextlevel == CONTEXT_USER) {
                     // module context doesn't have child contexts, so display in current context only
                     $mform->addElement('hidden', 'bui_contexts', BUI_CONTEXTS_CURRENT);
                 } else {
                     $parentcontextname = $parentcontext->get_context_name();
                     $contextoptions[BUI_CONTEXTS_CURRENT] = get_string('showoncontextonly', 'block', $parentcontextname);
                     $contextoptions[BUI_CONTEXTS_CURRENT_SUBS] = get_string('showoncontextandsubs', 'block', $parentcontextname);
                     $mform->addElement('select', 'bui_contexts', get_string('contexts', 'block'), $contextoptions);
                 }
             }
         }
     }
     $mform->setType('bui_contexts', PARAM_INT);
     // Generate pagetype patterns by callbacks if necessary (has not been set specifically)
     if (empty($pagetypelist)) {
         $pagetypelist = generate_page_type_patterns($this->page->pagetype, $parentcontext, $this->page->context);
         $displaypagetypewarning = false;
         if (!array_key_exists($this->block->instance->pagetypepattern, $pagetypelist)) {
             // Pushing block's existing page type pattern
             $pagetypestringname = 'page-' . str_replace('*', 'x', $this->block->instance->pagetypepattern);
             if (get_string_manager()->string_exists($pagetypestringname, 'pagetype')) {
                 $pagetypelist[$this->block->instance->pagetypepattern] = get_string($pagetypestringname, 'pagetype');
             } else {
                 //as a last resort we could put the page type pattern in the select box
                 //however this causes mod-data-view to be added if the only option available is mod-data-*
//.........这里部分代码省略.........

 function definition()
 {
     $mform =& $this->_form;
     // First show fields specific to this type of block.
     $this->specific_definition($mform);
     // Then show the fields about where this block appears.
     $mform->addElement('header', 'whereheader', get_string('wherethisblockappears', 'block'));
     // If the current weight of the block is out-of-range, add that option in.
     $blockweight = $this->block->instance->weight;
     $weightoptions = array();
     if ($blockweight < -block_manager::MAX_WEIGHT) {
         $weightoptions[$blockweight] = $blockweight;
     }
     for ($i = -block_manager::MAX_WEIGHT; $i <= block_manager::MAX_WEIGHT; $i++) {
         $weightoptions[$i] = $i;
     }
     if ($blockweight > block_manager::MAX_WEIGHT) {
         $weightoptions[$blockweight] = $blockweight;
     }
     $first = reset($weightoptions);
     $weightoptions[$first] = get_string('bracketfirst', 'block', $first);
     $last = end($weightoptions);
     $weightoptions[$last] = get_string('bracketlast', 'block', $last);
     $regionoptions = $this->page->theme->get_all_block_regions();
     $parentcontext = get_context_instance_by_id($this->block->instance->parentcontextid);
     $mform->addElement('hidden', 'bui_parentcontextid', $parentcontext->id);
     $mform->addElement('static', 'bui_homecontext', get_string('createdat', 'block'), print_context_name($parentcontext));
     $mform->addHelpButton('bui_homecontext', 'createdat', 'block');
     // parse pagetype patterns
     $bits = explode('-', $this->page->pagetype);
     $contextoptions = array();
     if ($parentcontext->contextlevel == CONTEXT_COURSE && $parentcontext->instanceid == SITEID || $parentcontext->contextlevel == CONTEXT_SYSTEM) {
         // Home page
         if ($bits[0] == 'tag' || $bits[0] == 'admin') {
             // tag and admin pages always use system context
             // the contexts options don't make differences, so we use
             // page type patterns only
             $mform->addElement('hidden', 'bui_contexts', BUI_CONTEXTS_ENTIRE_SITE);
         } else {
             $contextoptions[BUI_CONTEXTS_FRONTPAGE_ONLY] = get_string('showonfrontpageonly', 'block');
             $contextoptions[BUI_CONTEXTS_FRONTPAGE_SUBS] = get_string('showonfrontpageandsubs', 'block');
             $contextoptions[BUI_CONTEXTS_ENTIRE_SITE] = get_string('showonentiresite', 'block');
             $mform->addElement('select', 'bui_contexts', get_string('contexts', 'block'), $contextoptions);
             $mform->addHelpButton('bui_contexts', 'contexts', 'block');
         }
     } else {
         if ($parentcontext->contextlevel == CONTEXT_COURSE) {
             // 0 means display on current context only, not child contexts
             // but if course managers select mod-* as pagetype patterns, block system will overwrite this option
             // to 1 (display on current context and child contexts)
             $mform->addElement('hidden', 'bui_contexts', BUI_CONTEXTS_CURRENT);
         } else {
             if ($parentcontext->contextlevel == CONTEXT_MODULE or $parentcontext->contextlevel == CONTEXT_USER) {
                 // module context doesn't have child contexts, so display in current context only
                 $mform->addElement('hidden', 'bui_contexts', BUI_CONTEXTS_CURRENT);
             } else {
                 $parentcontextname = print_context_name($parentcontext);
                 $contextoptions[BUI_CONTEXTS_CURRENT] = get_string('showoncontextonly', 'block', $parentcontextname);
                 $contextoptions[BUI_CONTEXTS_CURRENT_SUBS] = get_string('showoncontextandsubs', 'block', $parentcontextname);
                 $mform->addElement('select', 'bui_contexts', get_string('contexts', 'block'), $contextoptions);
             }
         }
     }
     $displaypagetypewarning = false;
     if ($this->page->pagetype == 'site-index') {
         // No need for pagetype list on home page
         $pagetypelist = array('*' => get_string('page-x', 'pagetype'));
     } else {
         // Generate pagetype patterns by callbacks
         $pagetypelist = generate_page_type_patterns($this->page->pagetype, $parentcontext, $this->page->context);
         if (!array_key_exists($this->block->instance->pagetypepattern, $pagetypelist)) {
             // Pushing block's existing page type pattern
             $pagetypestringname = 'page-' . str_replace('*', 'x', $this->block->instance->pagetypepattern);
             if (get_string_manager()->string_exists($pagetypestringname, 'pagetype')) {
                 $pagetypelist[$this->block->instance->pagetypepattern] = get_string($pagetypestringname, 'pagetype');
             } else {
                 //as a last resort we could put the page type pattern in the select box
                 //however this causes mod-data-view to be added if the only option available is mod-data-*
                 // so we are just showing a warning to users about their prev setting being reset
                 $displaypagetypewarning = true;
             }
         }
     }
     // hide page type pattern select box if there is only one choice
     if (count($pagetypelist) > 1) {
         if ($displaypagetypewarning) {
             $mform->addElement('static', 'pagetypewarning', '', get_string('pagetypewarning', 'block'));
         }
         $mform->addElement('select', 'bui_pagetypepattern', get_string('restrictpagetypes', 'block'), $pagetypelist);
     } else {
         $value = array_pop(array_keys($pagetypelist));
         $mform->addElement('hidden', 'bui_pagetypepattern', $value);
     }
     if ($this->page->subpage) {
         if ($parentcontext->contextlevel == CONTEXT_USER) {
             $mform->addElement('hidden', 'bui_subpagepattern', '%@NULL@%');
         } else {
             $subpageoptions = array('%@NULL@%' => get_string('anypagematchingtheabove', 'block'), $this->page->subpage => get_string('thisspecificpage', 'block', $this->page->subpage));
             $mform->addElement('select', 'bui_subpagepattern', get_string('subpages', 'block'), $subpageoptions);
         }
//.........这里部分代码省略.........