Add empty state node to role editor

packages/builder/src/components/backend/RoleEditor/Controls.svelte

@@ -7,10 +7,13 @@
 
   const { nodes, edges, createRole } = getContext("flow")
   const flow = useSvelteFlow()
+  const autoFit = () =>
+    flow.fitView({ maxZoom: MaxAutoZoom, duration: ZoomDuration })
 
   const addRole = async () => {
     await createRole()
     doAutoLayout()
+    autoFit()
   }
 
   const doAutoLayout = () => {
@@ -33,13 +36,7 @@
       on:click={() => flow.zoomOut({ duration: ZoomDuration })}
     />
   </div>
-  <Button
-    secondary
-    on:click={() =>
-      flow.fitView({ maxZoom: MaxAutoZoom, duration: ZoomDuration })}
-  >
-    Zoom to fit
-  </Button>
+  <Button secondary on:click={autoFit}>Zoom to fit</Button>
   <Button secondary on:click={doAutoLayout}>Auto layout</Button>
 </div>
 <div class="control bottom-right">

packages/builder/src/components/backend/RoleEditor/EmptyStateNode.svelte

@@ -0,0 +1,24 @@
+<script>
+  import { NodeWidth, NodeHeight } from "./constants"
+</script>
+
+<div class="node" style={`--width:${NodeWidth}px; --height:${NodeHeight}px;`}>
+  Add custom roles for more granular control over permissions
+</div>
+
+<style>
+  .node {
+    border-radius: 4px;
+    width: var(--width);
+    height: var(--height);
+    display: grid;
+    place-items: center;
+    font-size: 16px;
+    text-align: center;
+    color: var(--spectrum-global-color-gray-800);
+    text-shadow: 4px 4px 10px var(--background-color),
+      4px -4px 10px var(--background-color),
+      -4px 4px 10px var(--background-color),
+      -4px -4px 10px var(--background-color);
+  }
+</style>

packages/builder/src/components/backend/RoleEditor/RoleFlow.svelte

@@ -10,6 +10,7 @@
   } from "@xyflow/svelte"
   import "@xyflow/svelte/dist/style.css"
   import RoleNode from "./RoleNode.svelte"
+  import EmptyStateNode from "./EmptyStateNode.svelte"
   import RoleEdge from "./RoleEdge.svelte"
   import BracketEdge from "./BracketEdge.svelte"
   import {
@@ -18,6 +19,7 @@
     getBasicPosition,
     rolesToLayout,
     nodeToRole,
+    getBounds,
   } from "./utils"
   import { setContext, tick } from "svelte"
   import Controls from "./Controls.svelte"
@@ -38,9 +40,7 @@
   })
 
   // Derive the bounds of all custom role nodes
-  const bounds = derivedMemo(nodes, $nodes => {
-    return getNodesBounds($nodes.filter(node => node.data.custom))
-  })
+  const bounds = derivedMemo(nodes, getBounds)
 
   $: handleExternalRoleChanges($roles)
   $: updateBuiltins($bounds)
@@ -159,7 +159,7 @@
     {nodes}
     {edges}
     snapGrid={[GridResolution, GridResolution]}
-    nodeTypes={{ role: RoleNode }}
+    nodeTypes={{ role: RoleNode, empty: EmptyStateNode }}
     edgeTypes={{ role: RoleEdge, bracket: BracketEdge }}
     proOptions={{ hideAttribution: true }}
     fitViewOptions={{ maxZoom: MaxAutoZoom }}

packages/builder/src/components/backend/RoleEditor/utils.js

@@ -11,6 +11,22 @@ import { Roles } from "constants/backend"
 import { roles } from "stores/builder"
 import { get } from "svelte/store"
 
+// Calculates the bounds of all custom nodes
+export const getBounds = nodes => {
+  const customNodes = nodes.filter(node => node.data.custom)
+
+  // Empty state bounds which line up with bounds after adding first node
+  if (!customNodes.length) {
+    return {
+      x: 0,
+      y: 6.5 * GridResolution,
+      width: 12 * GridResolution,
+      height: 10 * GridResolution,
+    }
+  }
+  return getNodesBounds(customNodes)
+}
+
 // Gets the position of the basic role
 export const getBasicPosition = bounds => ({
   x: bounds.x - NodeHSpacing - NodeWidth,
@@ -33,6 +49,10 @@ const preProcessLayout = ({ nodes, edges }) => {
       if (ignoredRoles.includes(node.id)) {
         return false
       }
+      // Filter out empty state
+      if (node.id === "empty") {
+        return false
+      }
       return true
     }),
     edges: edges.filter(edge => {
@@ -82,7 +102,7 @@ export const dagreLayout = ({ nodes, edges }) => {
 
 const postProcessLayout = ({ nodes, edges }) => {
   // Reposition basic and admin to bound the custom nodes
-  const bounds = getNodesBounds(nodes.filter(node => node.data.custom))
+  const bounds = getBounds(nodes)
   nodes.find(x => x.id === Roles.BASIC).position = getBasicPosition(bounds)
   nodes.find(x => x.id === Roles.ADMIN).position = getAdminPosition(bounds)
 
@@ -99,6 +119,28 @@ const postProcessLayout = ({ nodes, edges }) => {
     target: Roles.BASIC,
     type: "bracket",
   })
+
+  // Add empty state node if required
+  if (!nodes.filter(node => node.data.custom).length) {
+    nodes.push({
+      id: "empty",
+      type: "empty",
+      position: {
+        x: bounds.x + bounds.width / 2 - NodeWidth / 2,
+        y: bounds.y + bounds.height / 2 - NodeHeight / 2,
+      },
+      data: {},
+      measured: {
+        width: NodeWidth,
+        height: NodeHeight,
+      },
+      deletable: false,
+      draggable: false,
+      connectable: false,
+      selectable: false,
+    })
+  }
+
   return { nodes, edges }
 }