feat(eventing): Emit new annotations_staged_change event

src/@types/events.ts

@@ -1,6 +1,7 @@
 enum Event {
     ACTIVE_CHANGE = 'annotations_active_change',
     ACTIVE_SET = 'annotations_active_set',
+    CREATOR_STAGED_CHANGE = 'creator_staged_change',
     ANNOTATION_CREATE = 'annotations_create',
     ANNOTATION_FETCH_ERROR = 'annotations_fetch_error',
     ANNOTATION_REMOVE = 'annotations_remove',

src/store/eventing/__tests__/staged-test.ts

@@ -0,0 +1,117 @@
+import eventManager from '../../../common/EventManager';
+import { AppState } from '../../types';
+import { getStatus, getType, handleSetStagedAction, handleResetCreatorAction } from '../staged';
+import { createStore } from '../..';
+import { CreatorItemHighlight, CreatorItemRegion, CreatorState } from '../../creator';
+import { Event } from '../../../@types';
+
+jest.mock('../../../common/EventManager');
+
+describe('store/eventing/staged', () => {
+    const getStagedHighlight = (): CreatorItemHighlight => ({
+        location: 1,
+        shapes: [
+            {
+                type: 'rect',
+                height: 50,
+                width: 50,
+                x: 10,
+                y: 10,
+            },
+        ],
+    });
+
+    const getStagedRegion = (): CreatorItemRegion => ({
+        location: 1,
+        shape: {
+            type: 'rect',
+            height: 50,
+            width: 50,
+            x: 10,
+            y: 10,
+        },
+    });
+
+    const getCreatorHighlight = (): CreatorState =>
+        ({
+            staged: getStagedHighlight(),
+        } as CreatorState);
+
+    const getCreatorRegion = (): CreatorState =>
+        ({
+            staged: getStagedRegion(),
+        } as CreatorState);
+
+    const getCreatorState = (isHighlight = true): AppState => {
+        const creator = isHighlight ? getCreatorHighlight() : getCreatorRegion();
+        return createStore({ creator }).getState();
+    };
+
+    describe('getStatus()', () => {
+        test.each`
+            prev         | next         | expectedStatus
+            ${null}      | ${null}      | ${null}
+            ${null}      | ${'notnull'} | ${'create'}
+            ${'notnull'} | ${null}      | ${null}
+            ${'notnull'} | ${'notnull'} | ${'update'}
+        `(
+            'should return $expectedStatus if prevStaged=$prev and nextStaged=$next',
+            ({ prev, next, expectedStatus }) => {
+                expect(getStatus(prev, next)).toBe(expectedStatus);
+            },
+        );
+    });
+
+    describe('getType()', () => {
+        test.each`
+            staged                  | expectedType
+            ${null}                 | ${null}
+            ${getStagedHighlight()} | ${'highlight'}
+            ${getStagedRegion()}    | ${'region'}
+        `('should returned $expectedType if staged=$staged', ({ staged, expectedType }) => {
+            expect(getType(staged)).toBe(expectedType);
+        });
+    });
+
+    describe('handleSetStagedAction()', () => {
+        test.each`
+            prev                        | next
+            ${createStore().getState()} | ${createStore().getState()}
+            ${getCreatorState()}        | ${createStore().getState()}
+        `('should not emit event if status or type is null', ({ prev, next }) => {
+            handleSetStagedAction(prev, next);
+
+            expect(eventManager.emit).not.toHaveBeenCalled();
+        });
+
+        test.each`
+            prev                        | next                      | type           | status
+            ${createStore().getState()} | ${getCreatorState()}      | ${'highlight'} | ${'create'}
+            ${createStore().getState()} | ${getCreatorState(false)} | ${'region'}    | ${'create'}
+            ${getCreatorState(false)}   | ${getCreatorState(false)} | ${'region'}    | ${'update'}
+        `('should emit event with type=$type and status=$status', ({ prev, next, type, status }) => {
+            handleSetStagedAction(prev, next);
+
+            expect(eventManager.emit).toHaveBeenCalledWith(Event.CREATOR_STAGED_CHANGE, { type, status });
+        });
+    });
+
+    describe('handleResetCreatorAction()', () => {
+        test('should not emit event if type is null', () => {
+            const prevState = createStore().getState();
+            handleResetCreatorAction(prevState);
+
+            expect(eventManager.emit).not.toHaveBeenCalled();
+        });
+
+        test.each`
+            prev                      | type
+            ${getCreatorState()}      | ${'highlight'}
+            ${getCreatorState(false)} | ${'region'}
+        `('should emit cancel event if with type=$type', ({ prev, type }) => {
+            handleResetCreatorAction(prev);
+
+            expect(eventManager.emit).toHaveBeenCalledWith(Event.CREATOR_STAGED_CHANGE, { type, status: 'cancel' });
+        });
+    });
+});

src/store/eventing/middleware.ts

@@ -11,7 +11,9 @@ import { handleActiveAnnotationEvents } from './active';
 import { handleAnnotationsInitialized } from './init';
 import { handleCreateErrorEvents, handleCreatePendingEvents, handleCreateSuccessEvents } from './create';
 import { handleFetchErrorEvents } from './fetch';
+import { handleResetCreatorAction, handleSetStagedAction } from './staged';
 import { handleToggleAnnotationModeAction } from './mode';
+import { resetCreatorAction, setStagedAction } from '../creator';
 import { toggleAnnotationModeAction } from '../common/actions';
 
 // Array of event handlers based on redux action. To add handling for new events add an entry keyed by action
@@ -20,8 +22,10 @@ const eventHandlers: EventHandlerMap = {
     [createAnnotationAction.pending.toString()]: handleCreatePendingEvents,
     [createAnnotationAction.rejected.toString()]: handleCreateErrorEvents,
     [fetchAnnotationsAction.rejected.toString()]: handleFetchErrorEvents,
+    [resetCreatorAction.toString()]: handleResetCreatorAction,
     [setActiveAnnotationIdAction.toString()]: handleActiveAnnotationEvents,
     [setIsInitialized.toString()]: handleAnnotationsInitialized,
+    [setStagedAction.toString()]: handleSetStagedAction,
     [toggleAnnotationModeAction.toString()]: handleToggleAnnotationModeAction,
 };
 

src/store/eventing/staged.ts

@@ -0,0 +1,60 @@
+import eventManager from '../../common/EventManager';
+import { AppState } from '../types';
+import { CreatorItem, getCreatorStaged, isCreatorStagedHighlight, isCreatorStagedRegion } from '../creator';
+import { Event } from '../../@types';
+
+type Status = 'create' | 'update' | 'cancel';
+
+type Type = 'highlight' | 'region';
+
+export const getStatus = (prevStaged: CreatorItem, nextStaged: CreatorItem): Status | null => {
+    let status: Status | null = null;
+
+    if (prevStaged === null && nextStaged !== null) {
+        status = 'create';
+    }
+
+    if (prevStaged !== null && nextStaged !== null) {
+        status = 'update';
+    }
+
+    return status;
+};
+
+export const getType = (staged: CreatorItem): Type | null => {
+    let type: Type | null = null;
+
+    if (isCreatorStagedRegion(staged)) {
+        type = 'region';
+    }
+
+    if (isCreatorStagedHighlight(staged)) {
+        type = 'highlight';
+    }
+
+    return type;
+};
+
+export const handleSetStagedAction = (prevState: AppState, nextState: AppState): void => {
+    const prevStaged = getCreatorStaged(prevState);
+    const nextStaged = getCreatorStaged(nextState);
+    const status = getStatus(prevStaged, nextStaged);
+    const type = getType(prevStaged) || getType(nextStaged);
+
+    if (!status || !type) {
+        return;
+    }
+
+    eventManager.emit(Event.CREATOR_STAGED_CHANGE, { type, status });
+};
+
+export const handleResetCreatorAction = (prevState: AppState): void => {
+    const prevStaged = getCreatorStaged(prevState);
+    const type = getType(prevStaged);
+
+    if (!type) {
+        return;
+    }
+
+    eventManager.emit(Event.CREATOR_STAGED_CHANGE, { type, status: 'cancel' });
+};