feat: add undo stack of object resize/move [#358]

src/index.js

@@ -22,5 +22,6 @@ import './js/command/resizeCanvasDimension';
 import './js/command/rotate';
 import './js/command/setObjectProperties';
 import './js/command/setObjectPosition';
+import './js/command/changeSelection';
 
 module.exports = ImageEditor;

src/js/command/changeSelection.js

@@ -0,0 +1,30 @@
+/**
+ * @author NHN Ent. FE Development Team <dl_javascript@nhn.com>
+ * @fileoverview change selection
+ */
+import commandFactory from '../factory/command';
+import {Promise} from '../util';
+import {commandNames} from '../consts';
+
+const command = {
+    name: commandNames.CHANGE_SELECTION,
+
+    execute(graphics, props) {
+        props.forEach(prop => {
+            graphics.setObjectProperties(prop.id, prop);
+        });
+
+        return Promise.resolve();
+    },
+    undo(graphics) {
+        this.undoData.forEach(datum => {
+            graphics.setObjectProperties(datum.id, datum);
+        });
+
+        return Promise.resolve();
+    }
+};
+
+commandFactory.register(command);
+
+export default command;

src/js/consts.js

@@ -99,7 +99,8 @@ export const commandNames = {
     'ADD_IMAGE_OBJECT': 'addImageObject',
     'RESIZE_CANVAS_DIMENSION': 'resizeCanvasDimension',
     'SET_OBJECT_PROPERTIES': 'setObjectProperties',
-    'SET_OBJECT_POSITION': 'setObjectPosition'
+    'SET_OBJECT_POSITION': 'setObjectPosition',
+    'CHANGE_SELECTION': 'changeSelection'
 };
 
 /**
@@ -113,6 +114,7 @@ export const eventNames = {
     OBJECT_CREATED: 'objectCreated',
     OBJECT_ROTATED: 'objectRotated',
     OBJECT_ADDED: 'objectAdded',
+    OBJECT_MODIFIED: 'objectModified',
     TEXT_EDITING: 'textEditing',
     TEXT_CHANGED: 'textChanged',
     ICON_CREATE_RESIZE: 'iconCreateResize',

src/js/graphics.js

@@ -21,6 +21,11 @@ import ShapeDrawingMode from './drawingMode/shape';
 import TextDrawingMode from './drawingMode/text';
 import {getProperties, includes, isShape, Promise} from './util';
 import {componentNames as components, eventNames as events, drawingModes, fObjectOptions} from './consts';
+import {
+    makeSelectionUndoData,
+    makeSelectionUndoDatum,
+    setCachedUndoDataForDimension
+} from './helper/selectionModifyHelper';
 
 const {extend, stamp, isArray, isString, forEachArray, forEachOwnProperties, CustomEvents} = snippet;
 const DEFAULT_CSS_MAX_WIDTH = 1000;
@@ -987,6 +992,15 @@ class Graphics {
      */
     _onMouseDown(fEvent) {
         const originPointer = this._canvas.getPointer(fEvent.e);
+        const targetObject = fEvent.target;
+
+        if (targetObject) {
+            const undoData = makeSelectionUndoData(targetObject,
+                item => makeSelectionUndoDatum(this.getObjectId(item), item));
+
+            setCachedUndoDataForDimension(undoData);
+        }
+
         this.fire(events.MOUSE_DOWN, fEvent.e, originPointer);
     }
 
@@ -1045,6 +1059,8 @@ class Graphics {
 
             items.forEach(item => item.fire('modifiedInGroup', target));
         }
+
+        this.fire(events.OBJECT_MODIFIED, target, this.createObjectProperties(target).id);
     }
 
     /**

src/js/helper/selectionModifyHelper.js

@@ -0,0 +1,81 @@
+/**
+ * @author NHN. FE Development Team <dl_javascript@nhn.com>
+ * @fileoverview Selection modify helper
+ */
+
+/**
+ * Cached selection's info
+ * @type {Array}
+ * @private
+ */
+let cachedUndoDataForChangeDimension = null;
+
+/**
+ * Set cached undo data
+ * @param {Array} undoData - selection object
+ * @private
+ */
+export function setCachedUndoDataForDimension(undoData) {
+    cachedUndoDataForChangeDimension = undoData;
+}
+
+/**
+ * Get cached undo data
+ * @returns {Object} cached undo data
+ * @private
+ */
+export function getCachedUndoDataForDimension() {
+    return cachedUndoDataForChangeDimension;
+}
+
+/**
+ * Make undo data
+ * @param {fabric.Object} obj - selection object
+ * @param {Function} undoDatumMaker - make undo datum
+ * @returns {Array} undoData
+ * @private
+ */
+export function makeSelectionUndoData(obj, undoDatumMaker) {
+    let undoData;
+
+    if (obj.type === 'activeSelection') {
+        undoData = obj.getObjects().map(item => {
+            const {angle, left, top} = item;
+
+            obj.realizeTransform(item);
+            const result = undoDatumMaker(item);
+
+            item.set({
+                angle,
+                left,
+                top
+            });
+
+            return result;
+        });
+    } else {
+        undoData = [undoDatumMaker(obj)];
+    }
+
+    return undoData;
+}
+
+/**
+ * Make undo datum
+ * @param {number} id - object id
+ * @param {fabric.Object} obj - selection object
+ * @returns {Object} undo datum
+ * @private
+ */
+export function makeSelectionUndoDatum(id, obj) {
+    return {
+        id,
+        width: obj.width,
+        height: obj.height,
+        top: obj.top,
+        left: obj.left,
+        angle: obj.angle,
+        scaleX: obj.scaleX,
+        scaleY: obj.scaleY
+    };
+}

src/js/imageEditor.js

@@ -9,7 +9,12 @@ import action from './action';
 import commandFactory from './factory/command';
 import Graphics from './graphics';
 import {sendHostName, Promise} from './util';
-import {eventNames as events, commandNames as commands, keyCodes, rejectMessages} from './consts';
+import {eventNames as events, commandNames as commands, keyCodes, rejectMessages, commandNames} from './consts';
+import {
+    getCachedUndoDataForDimension,
+    makeSelectionUndoData,
+    makeSelectionUndoDatum
+} from './helper/selectionModifyHelper';
 
 const {isUndefined, forEach, CustomEvents} = snippet;
 
@@ -20,6 +25,7 @@ const {
     OBJECT_ACTIVATED,
     OBJECT_ROTATED,
     OBJECT_ADDED,
+    OBJECT_MODIFIED,
     ADD_TEXT,
     ADD_OBJECT,
     TEXT_EDITING,
@@ -208,6 +214,7 @@ class ImageEditor {
             objectScaled: this._onObjectScaled.bind(this),
             objectRotated: this._onObjectRotated.bind(this),
             objectAdded: this._onObjectAdded.bind(this),
+            objectModified: this._onObjectModified.bind(this),
             createdPath: this._onCreatedPath,
             addText: this._onAddText.bind(this),
             addObject: this._onAddObject.bind(this),
@@ -308,6 +315,7 @@ class ImageEditor {
             [OBJECT_ROTATED]: this._handlers.objectRotated,
             [OBJECT_ACTIVATED]: this._handlers.objectActivated,
             [OBJECT_ADDED]: this._handlers.objectAdded,
+            [OBJECT_MODIFIED]: this._handlers.objectModified,
             [ADD_TEXT]: this._handlers.addText,
             [ADD_OBJECT]: this._handlers.addObject,
             [TEXT_EDITING]: this._handlers.textEditing,
@@ -384,8 +392,8 @@ class ImageEditor {
 
     /**
      * mouse down event handler
-     * @param {Event} event mouse down event
-     * @param {Object} originPointer origin pointer
+     * @param {Event} event - mouse down event
+     * @param {Object} originPointer - origin pointer
      *  @param {Number} originPointer.x x position
      *  @param {Number} originPointer.y y position
      * @private
@@ -410,6 +418,7 @@ class ImageEditor {
          *     }
          * });
          */
+
         this.fire(events.MOUSE_DOWN, event, originPointer);
     }
 
@@ -423,6 +432,19 @@ class ImageEditor {
         this._invoker.pushUndoStack(command);
     }
 
+    /**
+     * Add a 'changeSelection' command
+     * @param {fabric.Object} obj - selection object
+     * @private
+     */
+    _pushModifyObjectCommand(obj) {
+        const command = commandFactory.create(commandNames.CHANGE_SELECTION, this._graphics,
+            makeSelectionUndoData(obj, item => makeSelectionUndoDatum(this._graphics.getObjectId(item), item)));
+        command.undoData = getCachedUndoDataForDimension();
+
+        this._invoker.pushUndoStack(command);
+    }
+
     /**
      * 'objectActivated' event handler
      * @param {ObjectProps} props - object properties
@@ -1213,7 +1235,6 @@ class ImageEditor {
      * @param {Object} objectProps added object properties
      * @private
      */
-
     _onObjectAdded(objectProps) {
         /**
          * The event when object added
@@ -1235,6 +1256,15 @@ class ImageEditor {
         this.fire(ADD_OBJECT_AFTER, objectProps);
     }
 
+    /**
+     * 'objectModified' event handler
+     * @param {fabric.Object} obj - selection object
+     * @private
+     */
+    _onObjectModified(obj) {
+        this._pushModifyObjectCommand(obj);
+    }
+
     /**
      * 'selectionCleared' event handler
      * @private

test/command.spec.js

@@ -9,6 +9,7 @@ import Invoker from '../src/js/invoker';
 import commandFactory from '../src/js/factory/command';
 import Graphics from '../src/js/graphics';
 import {commandNames as commands} from '../src/js/consts';
+import {getCachedUndoDataForDimension} from '../src/js/helper/selectionModifyHelper';
 
 describe('commandFactory', () => {
     let invoker, mockImage, canvas, graphics;
@@ -122,6 +123,65 @@ describe('commandFactory', () => {
             });
         });
     });
+    describe('changeSelectionCommand', () => {
+        let obj;
+
+        beforeEach(() => {
+            spyOn(canvas, 'getPointer');
+            obj = new fabric.Rect({
+                width: 10,
+                height: 10,
+                top: 10,
+                left: 10,
+                scaleX: 1,
+                scaleY: 1,
+                angle: 0
+            });
+            graphics._addFabricObject(obj);
+            graphics._onMouseDown({target: obj});
+
+            const makeCommand = commandFactory.create(commands.CHANGE_SELECTION, graphics, [{
+                id: graphics.getObjectId(obj),
+                width: 30,
+                height: 30,
+                top: 30,
+                left: 30,
+                scaleX: 0.5,
+                scaleY: 0.5,
+                angle: 10
+            }]);
+            makeCommand.undoData = getCachedUndoDataForDimension();
+            invoker.pushUndoStack(makeCommand);
+        });
+
+        it('should work undo command correctly', done => {
+            invoker.undo().then(() => {
+                expect(obj.width).toBe(10);
+                expect(obj.height).toBe(10);
+                expect(obj.left).toBe(10);
+                expect(obj.top).toBe(10);
+                expect(obj.scaleX).toBe(1);
+                expect(obj.scaleY).toBe(1);
+                expect(obj.angle).toBe(0);
+                done();
+            });
+        });
+
+        it('should work redo command correctly', done => {
+            invoker.undo().then(() => {
+                invoker.redo().then(() => {
+                    expect(obj.width).toBe(30);
+                    expect(obj.height).toBe(30);
+                    expect(obj.left).toBe(30);
+                    expect(obj.top).toBe(30);
+                    expect(obj.scaleX).toBe(0.5);
+                    expect(obj.scaleY).toBe(0.5);
+                    expect(obj.angle).toBe(10);
+                    done();
+                });
+            });
+        });
+    });
 
     describe('loadImageCommand', () => {
         const imageURL = 'base/test/fixtures/sampleImage.jpg';