Updated way of handling selected items by using writable store and context

packages/materialdesign-components/src/Checkbox/Checkbox.svelte

@@ -18,18 +18,16 @@
 
   let instance = null
   let checkbox = null
-  let context = null
+  let context = _bb.getContext("BBMD:input:context")
 
   onMount(() => {
-    context = _bb.getContext("BBMD:input:context")
-
     if (!!checkbox) {
       instance = new MDCCheckbox(checkbox)
       instance.indeterminate = indeterminate
       if (context !== "list-item") {
         //TODO: Fix this connected to Formfield context issue
-        // let fieldStore = _bb.getContext("BBMD:field-element")
-        // fieldStore.setInput(instance)
+        let fieldStore = _bb.getContext("BBMD:field-element")
+        fieldStore.setInput(instance)
       }
     }
   })

packages/materialdesign-components/src/Common/ItemStore.js

@@ -0,0 +1,54 @@
+import { writable } from "svelte/store";
+
+function createItemsStore(componentOnSelect) {
+    const { subscribe, set, update } = writable([]);
+
+    function addItem(item) {
+        update(items => {
+            return [...items, item]                  
+        })
+        if (componentOnSelect) {
+            componentOnSelect();            
+        }
+    }
+
+    function addSingleItem(item) {
+        set([item])
+        if (componentOnSelect) {
+            componentOnSelect();            
+        }
+    }
+
+    function removeItem(itemId) {
+        update(items => {
+            let index = getItemIdx(items, itemId)
+            items.splice(index, 1);
+            return items;
+        })
+        if (componentOnSelect) {
+            componentOnSelect();            
+        }
+    }
+
+    function clearItems() {
+        set([]);
+        if (componentOnSelect) {
+            componentOnSelect();            
+        }
+    }
+
+    function getItemIdx(items, itemId) {
+        return items.findIndex(i => i._id === itemId);
+    }
+
+    return {
+        subscribe,
+        addItem,
+        addSingleItem,
+        removeItem,
+        clearItems,
+        getItemIdx
+    }
+}
+
+export default createItemsStore

packages/materialdesign-components/src/List/List.svelte

@@ -1,10 +1,13 @@
 <script>
-  import { onMount, getContext } from "svelte"
+  import { onMount, getContext, setContext } from "svelte"
   import { MDCList } from "@material/list"
+  import createItemsStore from "../Common/ItemStore.js"
   import { MDCRipple } from "@material/ripple"
   import ListItem from "./ListItem.svelte"
   import ClassBuilder from "../ClassBuilder.js"
 
+  let selectedItems
+
   export let _bb
   const cb = new ClassBuilder("list", ["one-line"])
 
@@ -17,34 +20,32 @@
   export let variant = "two-line"
   export let inputElement = null
 
-  let selectedItems = []
-
-  //TODO: Try managing selected list items with a store that is passed into context. This way can check within the component whether list item is selected to not selecteds instead of managing from internal state which is not feasible 
-  function handleSelected(item) {
-    let idx = selectedItems.findIndex(i => i._id === item._id)
-    if (idx > -1) {
-      selectedItems.splice(idx, 1)
-      selectedItems = selectedItems
-    } else {
-      if (singleSelection) {
-        selectedItems = [item]
-      } else {
-        selectedItems = [...selectedItems, item]
-      }
-    }
-  }
-
-  //See todo above
-  _bb.setContext("BBMD:list:selectItem", handleSelected)
+  let selectedItemsStore
 
   let role = "listbox"
 
+  function createOrAcceptItemStore() {
+    let store = _bb.getContext("BBMD:list:selectItemStore")
+    if (!!store) {
+      selectedItemsStore = store
+    } else {
+      selectedItemsStore = createItemsStore(() => onSelect($selectedItemsStore))
+      _bb.setContext("BBMD:list:selectItemStore", selectedItemsStore)
+    }
+  }
+
   onMount(() => {
-    _bb.setContext("BBMD:list:props", { inputElement, variant })
+    createOrAcceptItemStore()
+
+    _bb.setContext("BBMD:list:props", {
+      inputElement,
+      variant,
+      singleSelection,
+    })
     if (!!list) {
-      instance = new MDCList(list)
-      instance.singleSelection = singleSelection
       if (!inputElement) {
+        instance = new MDCList(list)
+        instance.singleSelection = singleSelection
         instance.listElements.map(element => new MDCRipple(element))
       }
     }

packages/materialdesign-components/src/List/ListItem.svelte

@@ -1,5 +1,5 @@
 <script>
-  import { onMount } from "svelte"
+  import { onMount, getContext } from "svelte"
   import { Radiobutton } from "../Radiobutton"
   import { Checkbox } from "../Checkbox"
   import ClassBuilder from "../ClassBuilder.js"
@@ -12,6 +12,8 @@
   let _id
   let listProps = null
 
+  let selectedItems
+
   export let _bb
 
   export let value = null
@@ -25,24 +27,11 @@
 
   let role = "option"
 
-  function handleClick() {
-    if (!disabled) {
-      const selectItem = _bb.getContext("BBMD:list:selectItem")
-      selected = !selected
-      selectItem({
-        _id,
-        value,
-        text,
-        secondaryText,
-        selected,
-        disabled,
-      })
-    }
-  }
-
   onMount(() => {
     _id = shortid.generate()
 
+    selectedItems = _bb.getContext("BBMD:list:selectItemStore")
+
     listProps = _bb.getContext("BBMD:list:props")
 
     let context = _bb.getContext("BBMD:list:context")
@@ -51,15 +40,41 @@
     }
   })
 
+  function handleClick() {
+    let item = {
+      _id,
+      value,
+      text,
+      secondaryText,
+      selected,
+      disabled,
+    }
+    if (!disabled) {
+      if (
+        listProps.singleSelection ||
+        listProps.inputElement === "radiobutton"
+      ) {
+        selectedItems.addSingleItem(item)
+      } else {
+        let idx = selectedItems.getItemIdx($selectedItems, _id)
+        if (idx > -1) {
+          selectedItems.removeItem(_id)
+        } else {
+          selectedItems.addItem(item)
+        }
+      }
+    }
+  }
+
   $: if (listProps && !!listProps.inputElement) {
     _bb.setContext("BBMD:input:context", "list-item")
   }
 
-  $: shouldSel = selected && !listProps
-  $: console.log("Should Select", selected)
+  $: isSelected =
+    $selectedItems && selectedItems.getItemIdx($selectedItems, _id) > -1
 
   $: modifiers = {
-    selected: selected && (!listProps || !listProps.inputElement),
+    selected: isSelected && (!listProps || !listProps.inputElement),
     disabled,
   }
   $: props = { modifiers }
@@ -84,9 +99,9 @@
 
   {#if listProps}
     {#if listProps.inputElement === 'radiobutton'}
-      <Radiobutton checked={selected} {disabled} {_bb} />
+      <Radiobutton checked={isSelected} {disabled} {_bb} />
     {:else if listProps.inputElement === 'checkbox'}
-      <Checkbox checked={selected} {disabled} {_bb} />
+      <Checkbox checked={isSelected} {disabled} {_bb} />
     {/if}
   {:else if trailingIcon}
     <!-- TODO: Adapt label to accept class prop to handle this. Context is insufficient -->

packages/materialdesign-components/src/Radiobutton/Radiobutton.svelte

@@ -23,9 +23,8 @@
     if (!!radiobtn) {
       instance = new MDCRadio(radiobtn)
       if (context !== "list-item") {
-        //TODO: Fix this connected to Formfield context issue, _bb not binding properly
-        // let fieldStore = _bb.getContext("BBMD:field-element")
-        // fieldStore.setInput(instance)
+        let fieldStore = _bb.getContext("BBMD:field-element")
+        fieldStore.setInput(instance)
       }
     }
   })

packages/materialdesign-components/src/Test/props.js

@@ -118,8 +118,7 @@ export const props = {
   List: {
     _component: "@budibase/materialdesign-components/List",
     variant: "two-line",
-    inputElement: "radiobutton",
-    singleSelection: true,
+    singleSelection: false,
     onSelect: selected => console.log(selected),
     _children: [
       {