feat(measurements): Provide for the Load (SR) measurements button to optionally clear existing measurements prior to loading the SR. (#4586)

extensions/measurement-tracking/src/contexts/TrackedMeasurementsContext/TrackedMeasurementsContext.tsx

@@ -272,6 +272,14 @@ function TrackedMeasurementsContextProvider(
     viewports,
   ]);
 
+  useEffect(() => {
+    // The command needs to be bound to the context's sendTrackedMeasurementsEvent
+    // so the command has to be registered in a React component.
+    commandsManager.registerCommand('DEFAULT', 'loadTrackedSRMeasurements', {
+      commandFn: props => sendTrackedMeasurementsEvent('HYDRATE_SR', props),
+    });
+  }, [commandsManager, sendTrackedMeasurementsEvent]);
+
   return (
     <TrackedMeasurementsContext.Provider
       value={[trackedMeasurements, sendTrackedMeasurementsEvent]}

extensions/measurement-tracking/src/index.tsx

@@ -1,7 +1,11 @@
+import React from 'react';
+
 import getContextModule from './getContextModule';
 import getPanelModule from './getPanelModule';
 import getViewportModule from './getViewportModule';
 import { id } from './id.js';
+import { ViewportActionButton } from '@ohif/ui';
+import i18n from '@ohif/i18n';
 
 const measurementTrackingExtension = {
   /**
@@ -12,6 +16,28 @@ const measurementTrackingExtension = {
   getContextModule,
   getPanelModule,
   getViewportModule,
+
+  onModeEnter({ servicesManager }) {
+    const { toolbarService } = servicesManager.services;
+
+    toolbarService.addButtons(
+      [
+        {
+          // A button for loading tracked, SR measurements.
+          // Note that the command run is registered in TrackedMeasurementsContext
+          // because it must be bound to a React context's data.
+          id: 'loadSRMeasurements',
+          component: props => (
+            <ViewportActionButton {...props}>{i18n.t('Common:LOAD')}</ViewportActionButton>
+          ),
+          props: {
+            commands: ['loadTrackedSRMeasurements'],
+          },
+        },
+      ],
+      true // replace the button if it is already defined
+    );
+  },
 };
 
 export default measurementTrackingExtension;