Use a unique prop for allowing new windows to be created

__tests__/src/components/Workspace.test.js

@@ -123,13 +123,13 @@ describe('Workspace', () => {
       expect(addWindow).toHaveBeenCalledWith({ canvasId, manifest: manifestJson, manifestId });
     });
 
-    it('is a no-op if isWorkspaceControlPanelVisible is off', () => {
+    it('is a no-op if allowNewWindows is off', () => {
       const canvasId = 'canvasId';
       const manifestId = 'manifest.json';
       const manifestJson = { data: '123' };
 
       const addWindow = jest.fn();
-      const wrapper = createWrapper({ addWindow, isWorkspaceControlPanelVisible: false });
+      const wrapper = createWrapper({ addWindow, allowNewWindows: false });
       wrapper.find(IIIFDropTarget).simulate('drop', { canvasId, manifestId, manifestJson });
 
       expect(addWindow).not.toHaveBeenCalled();

src/components/Workspace.js

@@ -24,9 +24,9 @@ export class Workspace extends React.Component {
 
   /** */
   handleDrop({ canvasId, manifestId, manifestJson }, props, monitor) {
-    const { addWindow, isWorkspaceControlPanelVisible } = this.props;
+    const { addWindow, allowNewWindows } = this.props;
 
-    if (!isWorkspaceControlPanelVisible) return;
+    if (!allowNewWindows) return;
 
     addWindow({ canvasId, manifest: manifestJson, manifestId });
   }
@@ -131,6 +131,7 @@ export class Workspace extends React.Component {
 
 Workspace.propTypes = {
   addWindow: PropTypes.func,
+  allowNewWindows: PropTypes.bool,
   classes: PropTypes.objectOf(PropTypes.string).isRequired,
   isWorkspaceControlPanelVisible: PropTypes.bool.isRequired,
   maximizedWindowIds: PropTypes.arrayOf(PropTypes.string),
@@ -142,6 +143,7 @@ Workspace.propTypes = {
 
 Workspace.defaultProps = {
   addWindow: () => {},
+  allowNewWindows: true,
   maximizedWindowIds: [],
   windowIds: [],
 };

src/config/settings.js

@@ -295,6 +295,7 @@ export default {
   },
   workspace: {
     draggingEnabled: true,
+    allowNewWindows: true,
     id: uuid(),
     exposeModeOn: false, // unused?
     height: 5000, // height of the elastic mode's virtual canvas

src/containers/Workspace.js

@@ -14,6 +14,7 @@ import * as actions from '../state/actions';
  */
 const mapStateToProps = state => (
   {
+    allowNewWindows: state.config.workspace.allowNewWindows,
     isWorkspaceControlPanelVisible: state.config.workspaceControlPanel.enabled,
     maximizedWindowIds: getMaximizedWindowsIds(state),
     windowIds: getWindowIds(state),