fix: Exit MPR mode if Layout is changed (#984)

platform/viewer/src/connectedComponents/ConnectedLayoutButton.js

@@ -13,15 +13,23 @@ const mapStateToProps = state => {
 const mapDispatchToProps = dispatch => {
   return {
     // TODO: Change if layout switched becomes more complex
-    onChange: selectedCell => {
+    onChange: (selectedCell, currentLayout) => {
       let viewports = [];
       const rows = selectedCell.row + 1;
       const columns = selectedCell.col + 1;
       const numViewports = rows * columns;
       for (let i = 0; i < numViewports; i++) {
+        // Hacky way to allow users to exit MPR "mode"
+        const viewport = currentLayout.viewports[i];
+        let plugin = viewport && viewport.plugin;
+        if (viewport && viewport.vtk) {
+          plugin = 'cornerstone';
+        }
+
         viewports.push({
           height: `${100 / rows}%`,
           width: `${100 / columns}%`,
+          plugin,
         });
       }
       const layout = {
@@ -33,9 +41,19 @@ const mapDispatchToProps = dispatch => {
   };
 };
 
+const mergeProps = (propsFromState, propsFromDispatch) => {
+  const onChangeFromDispatch = propsFromDispatch.onChange;
+  const { currentLayout } = propsFromState;
+
+  return {
+    onChange: (selectedCell) => onChangeFromDispatch(selectedCell, currentLayout)
+  };
+}
+
 const ConnectedLayoutButton = connect(
   mapStateToProps,
-  mapDispatchToProps
+  mapDispatchToProps,
+  mergeProps
 )(LayoutButton);
 
 export default ConnectedLayoutButton;