feat(QTable): Binary state sort prop

Author: rstoenescu

dev/components/components/data-table.vue

@@ -22,6 +22,7 @@
         :columns="columns"
         :filter="filter"
         :title="title"
+        binary-state-sort
         :rows-per-page-options="[]"
         row-key="name"
       >

src/components/table/QTable.js

@@ -52,6 +52,7 @@ export default {
       default: 'horizontal',
       validator: v => ['horizontal', 'vertical', 'cell', 'none'].includes(v)
     },
+    binaryStateSort: Boolean,
     noDataLabel: String,
     noResultsLabel: String,
     loadingLabel: String,

src/components/table/table-sort.js

@@ -71,11 +71,18 @@ export default {
         sortBy = col
         descending = false
       }
-      else if (descending) {
-        sortBy = null
-      }
       else {
-        descending = true
+        if (this.binaryStateSort) {
+          descending = !descending
+        }
+        else {
+          if (descending) {
+            sortBy = null
+          }
+          else {
+            descending = true
+          }
+        }
       }
 
       this.setPagination({ sortBy, descending, page: 1 })