Issue #13 - Logic to override queries with specific className values

includes/query-loop.php

@@ -0,0 +1,133 @@
+<?php
+/**
+ * Overrides core/query-loop to implement multi part main query processing.
+ *
+ * The home page displays results in 3 blocks
+ *
+ * 1. Hero block
+ * 2. Thumbnail grid of up to 16 posts in full blocks of 4
+ * 3. Links
+ * followed by a pagination block which is handled separately
+ *
+ * This is a hack until a solution is delivered in Gutenberg.
+ * Note: Gutenberg's development team are probably unaware of the requirements.
+ *
+ * @param $attributes
+ * @param $content
+ * @param $block
+ * @return string
+ */
+function sb_render_block_core_query_loop( $attributes, $content, $block ) {
+    //bw_trace2();
+    $limit = null;
+    $className = isset( $attributes['className'] ) ? $attributes['className'] : null;
+    switch ( $className ) {
+        case 'sb hero':
+            $offset = 0;
+            $limit = 1;
+        break;
+        case 'sb thumbnail':
+            $offset = 1;
+            $limit = sb_featured_images( $offset );
+        break;
+        case 'sb links':
+            $offset = 1;
+            $limit = sb_featured_images( $offset );
+            $offset = $limit;
+            global $wp_query;
+
+            $limit = $wp_query->post_count;
+        break;
+        default:
+            // No special processing.
+    }
+
+    $html = '';
+    //$html .= "<p>Class name: $className</p>";
+    if ( $limit ) {
+        //$html .=  "<p>Processing: $limit from $offset</p>" . PHP_EOL;
+        //bw_trace2( $block->context, "block context", false  );
+        $attributes['offset'] = $offset;
+        $attributes['limit' ] = $limit;
+        $html .= sb_render_block_core_query_loop_main_query( $attributes, $content, $block );
+    } else {
+        $html .= gutenberg_render_block_core_query_loop($attributes, $content, $block);
+    }
+    return $html;
+}
+
+/**
+ * Renders the `core/query-loop` block for a main query on the server.
+ *
+ * @param array    $attributes Block attributes.
+ * @param string   $content    Block default content.
+ * @param WP_Block $block      Block instance.
+ *
+ * @return string Returns the output of the query, structured using the layout defined by the block's inner blocks.
+ */
+function sb_render_block_core_query_loop_main_query( $attributes, $content, $block ) {
+
+    global $wp_query;
+
+    $classnames = '';
+    if ( isset( $block->context['layout'] ) && isset( $block->context['query'] ) ) {
+        if ( isset( $block->context['layout']['type'] ) && 'flex' === $block->context['layout']['type'] ) {
+            $classnames = "is-flex-container columns-{$block->context['layout']['columns']}";
+        }
+    }
+
+    $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classnames ) );
+
+    $content = '';
+    foreach ( $wp_query->posts as $index => $post ) {
+        if ( $index >= $attributes['offset'] && $index < $attributes['limit']) {
+            $block_content = (
+            new WP_Block(
+                $block->parsed_block,
+                array(
+                    'postType' => $post->post_type,
+                    'postId' => $post->ID,
+                )
+            )
+            )->render(array('dynamic' => false));
+            $content .= "<li>{$block_content}</li>";
+        }
+    }
+
+    return sprintf(
+        '<ul %1$s>%2$s</ul>',
+        $wrapper_attributes,
+        $content
+    );
+}
+
+/**
+ * Returns the featured image count
+ *
+ * @param integer offset start offset - to allow for a big image at the start
+ * @return integer number of featured images
+ */
+function sb_featured_images( $offset ) {
+    $images = 0;
+    global $wp_query;
+    //bw_trace2( $wp_query, "wp_query", false );
+    if ( property_exists( $wp_query, "featured_images" ) ) {
+        $images = $wp_query->featured_images;
+    }
+    $images = sb_full_rows( $images, $offset );
+    return $images;
+}
+
+/**
+ * Returns the number of full rows
+ *
+ * @param integer $total total number of posts with featured images remaining
+ * @param integer $entries_per_row number of items in a rows
+ * @param integer $maximum_rows we support
+ * @return integer
+ */
+function sb_full_rows( $total, $offset=0, $entries_per_row=4, $maximum_rows=4 ) {
+    $rows = intdiv( $total-$offset, $entries_per_row );
+    $rows = min( $rows, $maximum_rows );
+    return ( $rows * $entries_per_row ) + $offset;
+}

includes/template-part.php

@@ -63,10 +63,13 @@ function sb_render_block_core_template_part( $attributes ) {
             $template_part_file_path = get_stylesheet_directory() . '/block-template-parts/' . $attributes['slug'] . '.html';
             if ( 0 === validate_file( $attributes['slug'] ) && file_exists( $template_part_file_path ) ) {
                 $content = file_get_contents( $template_part_file_path );
+
             }
         }
     }
 
+    // bw_trace2( $content, "template part content", false, BW_TRACE_VERBOSE );
+
     if ( is_null( $content ) && is_user_logged_in() ) {
         //print_r( $attributes );
         return sprintf(
@@ -126,5 +129,4 @@ function sb_render_block_core_template_part( $attributes ) {
     $wrapper_attributes = get_block_wrapper_attributes();
 
     return "<$html_tag $wrapper_attributes>" . str_replace( ']]>', ']]&gt;', $content ) . "</$html_tag>";
-}
-
+}