feat: Add a new hanging protocol @ohif/mn (#3305)

* feat: Add a new hanging protocol @ohif/mn

* Add @ohif/seg example

* PR comments and a couple more fixes to make things cleaner

* PR comment

* Added an example to cause the PR checks to rerun

extensions/cornerstone-dicom-seg/src/getHangingProtocolModule.ts

@@ -0,0 +1,78 @@
+import { Types } from '@ohif/core';
+
+const segProtocol: Types.HangingProtocol.Protocol = {
+  id: '@ohif/seg',
+  // Don't store this hanging protocol as it applies to the currently active
+  // display set by default
+  // cacheId: null,
+  hasUpdatedPriorsInformation: false,
+  name: 'Segmentations',
+  // Just apply this one when specifically listed
+  protocolMatchingRules: [],
+  toolGroupIds: ['default'],
+  // -1 would be used to indicate active only, whereas other values are
+  // the number of required priors referenced - so 0 means active with
+  // 0 or more priors.
+  numberOfPriorsReferenced: 0,
+  // Default viewport is used to define the viewport when
+  // additional viewports are added using the layout tool
+  defaultViewport: {
+    viewportOptions: {
+      viewportType: 'stack',
+      toolGroupId: 'default',
+      allowUnmatchedView: true,
+    },
+    displaySets: [
+      {
+        id: 'segDisplaySetId',
+        matchedDisplaySetsIndex: -1,
+      },
+    ],
+  },
+  displaySetSelectors: {
+    segDisplaySetId: {
+      seriesMatchingRules: [
+        {
+          attribute: 'Modality',
+          constraint: {
+            equals: 'SEG',
+          },
+        },
+      ],
+    },
+  },
+  stages: [
+    {
+      name: 'Segmentations',
+      viewportStructure: {
+        layoutType: 'grid',
+        properties: {
+          rows: 1,
+          columns: 1,
+        },
+      },
+      viewports: [
+        {
+          viewportOptions: { allowUnmatchedView: true },
+          displaySets: [
+            {
+              id: 'segDisplaySetId',
+            },
+          ],
+        },
+      ],
+    },
+  ],
+};
+
+function getHangingProtocolModule() {
+  return [
+    {
+      name: segProtocol.id,
+      protocol: segProtocol,
+    },
+  ];
+}
+
+export default getHangingProtocolModule;
+export { segProtocol };