feat(annotations): Add region comment button in toolbar

src/i18n/en-US.properties

@@ -10,6 +10,8 @@ zoom_out=Zoom out
 enter_fullscreen=Enter fullscreen
 # Button tooltip for exiting a full screen preview
 exit_fullscreen=Exit fullscreen
+# Button tooltip for annotation region comment
+region_comment=Comment on Region
 # Button tooltip for going to the previous page in a preview
 previous_page=Previous page
 # Input tooltip for navigating to a specific page in a preview

src/lib/AnnotationControls.scss

@@ -0,0 +1,22 @@
+.bp-AnnotationControls-group {
+    padding: 0 4px 0 8px;
+    border-left: 1px solid $twos;
+
+    .bp-AnnotationControls-regionBtn {
+        width: $controls-button-width;
+        height: $controls-button-width;
+        border-radius: 4px;
+
+        svg {
+            fill: $white;
+        }
+
+        &.is-active {
+            background-color: $white;
+
+            svg {
+                fill: $black;
+            }
+        }
+    }
+}

src/lib/AnnotationControls.ts

@@ -0,0 +1,74 @@
+import noop from 'lodash/noop';
+import { ICON_REGION_COMMENT } from './icons/icons';
+import Controls, { CLASS_BOX_CONTROLS_GROUP_BUTTON } from './Controls';
+
+export const CLASS_ANNOTATIONS_GROUP = 'bp-AnnotationControls-group';
+export const CLASS_REGION_BUTTON = 'bp-AnnotationControls-regionBtn';
+export const CLASS_BUTTON_ACTIVE = 'is-active';
+
+export type RegionHandlerType = ({ isRegionActive, event }: { isRegionActive: boolean; event: MouseEvent }) => void;
+export type Options = {
+    onRegionClick?: RegionHandlerType;
+};
+
+declare const __: (key: string) => string;
+
+export default class AnnotationControls {
+    /** @property {Controls} - Controls object */
+    private controls: Controls;
+
+    /** @property {boolean} - Region comment mode active state */
+    private isRegionActive = false;
+
+    /**
+     * [constructor]
+     *
+     * @param {Controls} controls - Viewer controls
+     * @return {AnnotationControls} Instance of AnnotationControls
+     */
+    constructor(controls: Controls) {
+        if (!controls || !(controls instanceof Controls)) {
+            throw Error('controls must be an instance of Controls');
+        }
+
+        this.controls = controls;
+    }
+
+    /**
+     * Region comment button click handler
+     *
+     * @param {RegionHandlerType} onRegionClick - region click handler in options
+     * @param {MouseEvent} event - mouse event
+     * @return {void}
+     */
+    private handleRegionClick = (onRegionClick: RegionHandlerType) => (event: MouseEvent): void => {
+        const regionButtonElement = event.target as HTMLButtonElement;
+
+        this.isRegionActive = !this.isRegionActive;
+        if (this.isRegionActive) {
+            regionButtonElement.classList.add(CLASS_BUTTON_ACTIVE);
+        } else {
+            regionButtonElement.classList.remove(CLASS_BUTTON_ACTIVE);
+        }
+
+        onRegionClick({ isRegionActive: this.isRegionActive, event });
+    };
+
+    /**
+     * Initialize the annotation controls with options.
+     *
+     * @param {RegionHandlerType} [options.onRegionClick] - Callback when region comment button is clicked
+     * @return {void}
+     */
+    public init({ onRegionClick = noop }: Options = {}): void {
+        const groupElement = this.controls.addGroup(CLASS_ANNOTATIONS_GROUP);
+        this.controls.add(
+            __('region_comment'),
+            this.handleRegionClick(onRegionClick),
+            `${CLASS_BOX_CONTROLS_GROUP_BUTTON} ${CLASS_REGION_BUTTON}`,
+            ICON_REGION_COMMENT,
+            'button',
+            groupElement,
+        );
+    }
+}

src/lib/Controls.scss

@@ -1,3 +1,8 @@
+$controls-button-width: 32px;
+
+@import './AnnotationControls';
+@import './ZoomControls';
+
 .bp-controls-wrapper {
     position: absolute;
     bottom: 25px;
@@ -11,7 +16,7 @@
     position: relative;
     left: -50%;
     display: flex;
-    background: fade-out($twos, .05);
+    background: fade-out($black, .2);
     border-radius: 3px;
     opacity: 0;
     transition: opacity .5s;
@@ -159,21 +164,14 @@
     }
 }
 
-.bp-zoom-current-scale {
-    min-width: 48px;
-    color: $white;
-    font-size: 14px;
-    text-align: center;
-}
-
 .bp-controls-group {
     display: flex;
     align-items: center;
     margin-right: 4px;
     margin-left: 4px;
 
     .bp-controls-group-btn {
-        width: 32px;
+        width: $controls-button-width;
     }
 
     & + .bp-controls-cell {

src/lib/Preview.js

@@ -921,9 +921,12 @@ class Preview extends EventEmitter {
         // Whether download button should be shown
         this.options.showDownload = !!options.showDownload;
 
-        // Whether annotations and annotation controls should be shown
+        // Whether annotations v2 should be shown
         this.options.showAnnotations = !!options.showAnnotations;
 
+        // Whether annotations v4 buttons should be shown in toolbar
+        this.options.showAnnotationsControls = !!options.showAnnotationsControls;
+
         // Enable or disable hotkeys
         this.options.useHotkeys = options.useHotkeys !== false;
 

src/lib/ZoomControls.js

@@ -3,7 +3,7 @@ import noop from 'lodash/noop';
 import { ICON_ZOOM_IN, ICON_ZOOM_OUT } from './icons/icons';
 import Controls, { CLASS_BOX_CONTROLS_GROUP_BUTTON } from './Controls';
 
-const CLASS_ZOOM_CURRENT_SCALE = 'bp-zoom-current-scale';
+const CLASS_ZOOM_CURRENT_SCALE = 'bp-ZoomControls-currentScale';
 const CLASS_ZOOM_CURRENT_SCALE_VALUE = 'bp-zoom-current-scale-value';
 const CLASS_ZOOM_IN_BUTTON = 'bp-zoom-in-btn';
 const CLASS_ZOOM_OUT_BUTTON = 'bp-zoom-out-btn';

src/lib/ZoomControls.scss

@@ -0,0 +1,6 @@
+.bp-ZoomControls-currentScale {
+    min-width: 48px;
+    color: $white;
+    font-size: 14px;
+    text-align: center;
+}

src/lib/__tests__/AnnotationControls-test.html

@@ -0,0 +1 @@
+<div id="test-annotation-controls-container"></div>

src/lib/__tests__/AnnotationControls-test.js

@@ -0,0 +1,97 @@
+/* eslint-disable no-unused-expressions */
+import AnnotationControls, { CLASS_REGION_BUTTON, CLASS_BUTTON_ACTIVE } from '../AnnotationControls';
+import Controls, { CLASS_BOX_CONTROLS_GROUP_BUTTON } from '../Controls';
+import { ICON_REGION_COMMENT } from '../icons/icons';
+
+let annotationControls;
+let stubs = {};
+
+const sandbox = sinon.sandbox.create();
+
+describe('lib/AnnotationControls', () => {
+    before(() => {
+        fixture.setBase('src/lib');
+    });
+
+    beforeEach(() => {
+        fixture.load('__tests__/AnnotationControls-test.html');
+        const controls = new Controls(document.getElementById('test-annotation-controls-container'));
+        annotationControls = new AnnotationControls(controls);
+        stubs.onRegionClick = sandbox.stub();
+    });
+
+    afterEach(() => {
+        fixture.cleanup();
+        sandbox.verifyAndRestore();
+
+        annotationControls = null;
+        stubs = {};
+    });
+
+    describe('constructor()', () => {
+        it('should create the correct DOM structure', () => {
+            expect(annotationControls.controls).not.to.be.undefined;
+        });
+
+        it('should throw an exception if controls is not provided', () => {
+            expect(() => new AnnotationControls()).to.throw(Error, 'controls must be an instance of Controls');
+        });
+    });
+
+    describe('init()', () => {
+        beforeEach(() => {
+            stubs.add = sandbox.stub(annotationControls.controls, 'add');
+            stubs.regionHandler = sandbox.stub();
+            sandbox.stub(annotationControls, 'handleRegionClick').returns(stubs.regionHandler);
+        });
+
+        it('should add the controls', () => {
+            annotationControls.init({ onRegionClick: stubs.onRegionClick });
+
+            expect(stubs.add).to.be.calledWith(
+                __('region_comment'),
+                stubs.regionHandler,
+                `${CLASS_BOX_CONTROLS_GROUP_BUTTON} ${CLASS_REGION_BUTTON}`,
+                ICON_REGION_COMMENT,
+                'button',
+                sinon.match.any,
+            );
+        });
+    });
+
+    describe('handleRegionClick()', () => {
+        beforeEach(() => {
+            stubs.classListAdd = sandbox.stub();
+            stubs.classListRemove = sandbox.stub();
+            stubs.event = sandbox.stub({
+                target: {
+                    classList: {
+                        add: stubs.classListAdd,
+                        remove: stubs.classListRemove,
+                    },
+                },
+            });
+        });
+
+        it('should activate region button then deactivate', () => {
+            expect(annotationControls.isRegionActive).to.be.false;
+
+            annotationControls.handleRegionClick(stubs.onRegionClick)(stubs.event);
+            expect(annotationControls.isRegionActive).to.be.true;
+            expect(stubs.classListAdd).to.be.calledWith(CLASS_BUTTON_ACTIVE);
+
+            annotationControls.handleRegionClick(stubs.onRegionClick)(stubs.event);
+            expect(annotationControls.isRegionActive).to.be.false;
+            expect(stubs.classListRemove).to.be.calledWith(CLASS_BUTTON_ACTIVE);
+        });
+
+        it('should call onRegionClick', () => {
+            annotationControls.handleRegionClick(stubs.onRegionClick)(stubs.event);
+
+            expect(stubs.onRegionClick).to.be.calledWith({
+                isRegionActive: true,
+                event: stubs.event,
+            });
+        });
+    });
+});

src/lib/__tests__/ZoomControls-test.js

@@ -59,7 +59,7 @@ describe('lib/ZoomControls', () => {
             expect(stubs.add).to.be.calledWith(
                 __('zoom_current_scale'),
                 undefined,
-                'bp-zoom-current-scale',
+                'bp-ZoomControls-currentScale',
                 sinon.match.string,
                 'div',
                 sinon.match.any,
@@ -125,7 +125,7 @@ describe('lib/ZoomControls', () => {
             expect(stubs.add).to.be.calledWith(
                 __('zoom_current_scale'),
                 undefined,
-                'bp-zoom-current-scale',
+                'bp-ZoomControls-currentScale',
                 sinon.match.string,
                 'div',
                 sinon.match.any,

src/lib/icons/icons.js

@@ -6,6 +6,7 @@ import FULLSCREEN_OUT from './full_screen_out_24px.svg';
 import ROTATE_LEFT from './rotate_left_24px.svg';
 import ZOOM_IN from './zoom_in.svg';
 import ZOOM_OUT from './zoom_out.svg';
+import REGION_COMMENT from './region_comment.svg';
 import ARROW_LEFT from './arrow_left_24px.svg';
 import ARROW_RIGHT from './arrow_right_24px.svg';
 import CHECK_MARK from './checkmark_24px.svg';
@@ -55,6 +56,7 @@ export const ICON_FULLSCREEN_OUT = FULLSCREEN_OUT;
 export const ICON_ROTATE_LEFT = ROTATE_LEFT;
 export const ICON_ZOOM_IN = ZOOM_IN;
 export const ICON_ZOOM_OUT = ZOOM_OUT;
+export const ICON_REGION_COMMENT = REGION_COMMENT;
 export const ICON_ARROW_LEFT = ARROW_LEFT;
 export const ICON_ARROW_RIGHT = ARROW_RIGHT;
 export const ICON_CHECK_MARK = CHECK_MARK;

src/lib/viewers/doc/DocBaseViewer.js

@@ -1,4 +1,5 @@
 import throttle from 'lodash/throttle';
+import AnnotationControls from '../../AnnotationControls';
 import BaseViewer from '../BaseViewer';
 import Browser from '../../Browser';
 import Controls from '../../Controls';
@@ -96,6 +97,7 @@ class DocBaseViewer extends BaseViewer {
         this.pinchToZoomEndHandler = this.pinchToZoomEndHandler.bind(this);
         this.pinchToZoomStartHandler = this.pinchToZoomStartHandler.bind(this);
         this.print = this.print.bind(this);
+        this.regionClickHandler = this.regionClickHandler.bind(this);
         this.setPage = this.setPage.bind(this);
         this.throttledScrollHandler = this.getScrollHandler().bind(this);
         this.toggleThumbnails = this.toggleThumbnails.bind(this);
@@ -1009,6 +1011,9 @@ class DocBaseViewer extends BaseViewer {
         this.controls = new Controls(this.containerEl);
         this.pageControls = new PageControls(this.controls, this.docEl);
         this.zoomControls = new ZoomControls(this.controls);
+        if (this.options.showAnnotationsControls) {
+            this.annotationControls = new AnnotationControls(this.controls);
+        }
         this.pageControls.addListener('pagechange', this.setPage);
         this.bindControlListeners();
     }
@@ -1090,8 +1095,22 @@ class DocBaseViewer extends BaseViewer {
             ICON_FULLSCREEN_IN,
         );
         this.controls.add(__('exit_fullscreen'), this.toggleFullscreen, 'bp-exit-fullscreen-icon', ICON_FULLSCREEN_OUT);
+
+        if (this.options.showAnnotationsControls) {
+            this.annotationControls.init({
+                onRegionClick: this.regionClickHandler,
+            });
+        }
     }
 
+    /**
+     * Handler for annotation toolbar region comment button click event.
+     *
+     * @private
+     * @return {void}
+     */
+    regionClickHandler() {}
+
     /**
      * Handler for 'pagesinit' event.
      *