To Collapse Right-side Blocks
10/31/2018


There are three things to do for this fix:
1) Add CSS to Boost's RAW SCSS dialog box
2) Make changes to moodle/theme/boost/classes/output/core_renderer.php
3) Make changes to moodle/theme/boost/templates/core/block.mustache
I prefer to make these changes to my MAMP Moodle, then copy these two
files to my ready-to-install Moodle.

1) -----------------------------------------------------------------------
In Boost's Raw SCSS dialog box, add the following code.
Note: Once added, you can leave this alone (CSS persists)

/* Needed to collapse right-side blocks.
Daniel Miericke, modified by Gareth Barnard */
.block {
    .block-action {
        @include fa-icon();
        cursor: pointer;
        float: right;
        margin: .2rem .6rem 0 0;
        &:before {
            content: $fa-var-compress;
        }
    }
    &.hidden {
        .block-action:before {
            content: $fa-var-expand;
        }
        .card-text {
            display: none;
        }
    }
}
/* Ricks modification */
.card-title {
    margin-bottom: .0rem;
}

2) -----------------------------------------------------------------------
In the file moodle/theme/boost/classes/output/core_renderer.php,
replace the existing public function block code with the following code

public function block(block_contents $bc, $region) {
        $bc = clone($bc); // Avoid messing up the object passed in.
        if (empty($bc->blockinstanceid) || !strip_tags($bc->title)) {
           $bc->collapsible = block_contents::NOT_HIDEABLE;
        }
        else {
            user_preference_allow_ajax_update('block'.$bc->blockinstanceid.'hidden', PARAM_INT);
        }
        $id = !empty($bc->attributes['id']) ? $bc->attributes['id'] : uniqid('block-');
        $context = new stdClass();
        $context->skipid = $bc->skipid;
        $context->blockinstanceid = $bc->blockinstanceid;
        $context->dockable = $bc->dockable;
        $context->collapsible = $bc->collapsible;
        $context->id = $id;
        $context->hidden = $bc->collapsible == block_contents::HIDDEN;
        $context->skiptitle = strip_tags($bc->title);
        $context->showskiplink = !empty($context->skiptitle);
        $context->arialabel = $bc->arialabel;
        $context->ariarole = !empty($bc->attributes['role']) ? $bc->attributes['role'] : 'complementary';
        $context->type = $bc->attributes['data-block'];
        $context->title = $bc->title;
        $context->content = $bc->content;
        $context->annotation = $bc->annotation;
        $context->footer = $bc->footer;
        $context->hascontrols = !empty($bc->controls);
        if ($context->hascontrols) {
            $context->controls = $this->block_controls($bc->controls, $id);
        }        return $this->render_from_template('core/block', $context);
    }

3) -----------------------------------------------------------------------
Replace all the contents in the file moodle/theme/boost/templates/core/block.mustache
 with the following:

{{!
    @template theme_boost/block    Example context (json):
    {
        "id": "block0",
        "showskiplink": true,
        "type": "html",
        "ariarole": "complementary",
        "title": "Test block",
        "blockinstanceid": 1,
        "content": "<p>Hello block world!</p>"
    }
}}
{{! Block Skip Link }}
{{#showskiplink}}
  <a href="#sb-{{skipid}}" class="sr-only sr-only-focusable">{{#str}}skipa, access, {{title}}{{/str}}</a>
{{/showskiplink}}
{{#collapsible}}
{{#js}}
$('#instance-{{blockinstanceid}}-action').click(function() {
$('#{{id}} .card-text').slideToggle('slow');
if( $('#{{id}}').hasClass('hidden')) {
        $('#{{id}}').removeClass('hidden');
        M.util.set_user_preference('block{{blockinstanceid}}hidden', 0);
    } else {
        $('#{{id}}').addClass('hidden');
        M.util.set_user_preference('block{{blockinstanceid}}hidden', 1);
    }
});
{{/js}}
{{/collapsible}}

{{! Start Block Container }}
<section id="{{id}}"
     class="{{#hidden}}hidden{{/hidden}} block block_{{type}} {{#hascontrols}}block_with_controls{{/hascontrols}} card mb-3"
     role="{{ariarole}}"
     data-block="{{type}}"
     {{#arialabel}}
        aria-label={{#quote}}{{{arialabel}}}{{/quote}}
     {{/arialabel}}
     {{^arialabel}}
        {{#title}}
          aria-labelledby="instance-{{blockinstanceid}}-header"
        {{/title}}
     {{/arialabel}}>    {{! Block contents }}
    <div class="card-body">
        {{#collapsible}}
            <div  id="instance-{{blockinstanceid}}-action" class="block-action"></div>
        {{/collapsible}}
        {{! Block header }}
        {{#title}}
            <h5 id="instance-{{blockinstanceid}}-header" class="card-title d-inline-block">{{{title}}}</h5>
        {{/title}}
        {{#hascontrols}}
            <div class="block-controls pull-right header">
                {{{controls}}}
            </div>
        {{/hascontrols}}
        <div class="card-text content mt-3">
            {{{content}}}
            <div class="footer">{{{footer}}}</div>
            {{{annotation}}}
        </div>
    </div>
{{! End Block Container }}
</section>
{{! Block Skip Link Target }}
{{#showskiplink}}
  <span id="sb-{{skipid}}"></span>
{{/showskiplink}}