1 | import {createFullOverrideContext, updateOverrideContexts, updateOverrideContext, indexOf} from './repeat-utilities';
|
2 | import {mergeSplice} from 'aurelia-binding';
|
3 | import { Repeat } from './repeat';
|
4 |
|
5 |
|
6 |
|
7 |
|
8 | export class ArrayRepeatStrategy {
|
9 | |
10 |
|
11 |
|
12 |
|
13 |
|
14 | getCollectionObserver(observerLocator, items) {
|
15 | return observerLocator.getArrayObserver(items);
|
16 | }
|
17 |
|
18 | |
19 |
|
20 |
|
21 |
|
22 |
|
23 | instanceChanged(repeat, items) {
|
24 | const $repeat = repeat as Repeat;
|
25 | const itemsLength = items.length;
|
26 |
|
27 |
|
28 |
|
29 | if (!items || itemsLength === 0) {
|
30 | $repeat.removeAllViews(true, !$repeat.viewsRequireLifecycle);
|
31 | return;
|
32 | }
|
33 |
|
34 | const children = $repeat.views();
|
35 | const viewsLength = children.length;
|
36 |
|
37 |
|
38 |
|
39 | if (viewsLength === 0) {
|
40 | this._standardProcessInstanceChanged($repeat, items);
|
41 | return;
|
42 | }
|
43 |
|
44 | if ($repeat.viewsRequireLifecycle) {
|
45 | const childrenSnapshot = children.slice(0);
|
46 | const itemNameInBindingContext = $repeat.local;
|
47 | const matcher = $repeat.matcher();
|
48 |
|
49 |
|
50 | let itemsPreviouslyInViews = [];
|
51 | const viewsToRemove = [];
|
52 |
|
53 | for (let index = 0; index < viewsLength; index++) {
|
54 | const view = childrenSnapshot[index];
|
55 | const oldItem = view.bindingContext[itemNameInBindingContext];
|
56 |
|
57 | if (indexOf(items, oldItem, matcher) === -1) {
|
58 |
|
59 | viewsToRemove.push(view);
|
60 | } else {
|
61 |
|
62 | itemsPreviouslyInViews.push(oldItem);
|
63 | }
|
64 | }
|
65 |
|
66 | let updateViews;
|
67 | let removePromise;
|
68 |
|
69 | if (itemsPreviouslyInViews.length > 0) {
|
70 | removePromise = $repeat.removeViews(viewsToRemove, true, !$repeat.viewsRequireLifecycle);
|
71 | updateViews = () => {
|
72 |
|
73 | for (let index = 0; index < itemsLength; index++) {
|
74 | const item = items[index];
|
75 | const indexOfView = indexOf(itemsPreviouslyInViews, item, matcher, index);
|
76 | let view;
|
77 |
|
78 | if (indexOfView === -1) {
|
79 | const overrideContext = createFullOverrideContext($repeat, items[index], index, itemsLength);
|
80 | $repeat.insertView(index, overrideContext.bindingContext, overrideContext);
|
81 |
|
82 | itemsPreviouslyInViews.splice(index, 0, undefined);
|
83 | } else if (indexOfView === index) {
|
84 | view = children[indexOfView];
|
85 | itemsPreviouslyInViews[indexOfView] = undefined;
|
86 | } else {
|
87 | view = children[indexOfView];
|
88 | $repeat.moveView(indexOfView, index);
|
89 | itemsPreviouslyInViews.splice(indexOfView, 1);
|
90 | itemsPreviouslyInViews.splice(index, 0, undefined);
|
91 | }
|
92 |
|
93 | if (view) {
|
94 | updateOverrideContext(view.overrideContext, index, itemsLength);
|
95 | }
|
96 | }
|
97 |
|
98 |
|
99 |
|
100 | this._inPlaceProcessItems($repeat, items);
|
101 | };
|
102 | } else {
|
103 |
|
104 | removePromise = $repeat.removeAllViews(true, !$repeat.viewsRequireLifecycle);
|
105 | updateViews = () => this._standardProcessInstanceChanged($repeat, items);
|
106 | }
|
107 |
|
108 | if (removePromise instanceof Promise) {
|
109 | removePromise.then(updateViews);
|
110 | } else {
|
111 | updateViews();
|
112 | }
|
113 | } else {
|
114 |
|
115 | this._inPlaceProcessItems($repeat, items);
|
116 | }
|
117 | }
|
118 |
|
119 | |
120 |
|
121 |
|
122 | _standardProcessInstanceChanged(repeat, items) {
|
123 | for (let i = 0, ii = items.length; i < ii; i++) {
|
124 | let overrideContext = createFullOverrideContext(repeat, items[i], i, ii);
|
125 | repeat.addView(overrideContext.bindingContext, overrideContext);
|
126 | }
|
127 | }
|
128 |
|
129 | |
130 |
|
131 |
|
132 | _inPlaceProcessItems(repeat, items) {
|
133 | let itemsLength = items.length;
|
134 | let viewsLength = repeat.viewCount();
|
135 |
|
136 | while (viewsLength > itemsLength) {
|
137 | viewsLength--;
|
138 | repeat.removeView(viewsLength, true, !repeat.viewsRequireLifecycle);
|
139 | }
|
140 |
|
141 | let local = repeat.local;
|
142 |
|
143 | for (let i = 0; i < viewsLength; i++) {
|
144 | let view = repeat.view(i);
|
145 | let last = i === itemsLength - 1;
|
146 | let middle = i !== 0 && !last;
|
147 | let bindingContext = view.bindingContext;
|
148 | let overrideContext = view.overrideContext;
|
149 |
|
150 | if (bindingContext[local] === items[i]
|
151 | && overrideContext.$middle === middle
|
152 | && overrideContext.$last === last) {
|
153 |
|
154 | continue;
|
155 | }
|
156 |
|
157 | bindingContext[local] = items[i];
|
158 | overrideContext.$middle = middle;
|
159 | overrideContext.$last = last;
|
160 | repeat.updateBindings(view);
|
161 | }
|
162 |
|
163 | for (let i = viewsLength; i < itemsLength; i++) {
|
164 | let overrideContext = createFullOverrideContext(repeat, items[i], i, itemsLength);
|
165 | repeat.addView(overrideContext.bindingContext, overrideContext);
|
166 | }
|
167 | }
|
168 |
|
169 | |
170 |
|
171 |
|
172 |
|
173 |
|
174 |
|
175 | instanceMutated(repeat, array, splices) {
|
176 | if (repeat.__queuedSplices) {
|
177 | for (let i = 0, ii = splices.length; i < ii; ++i) {
|
178 | let {index, removed, addedCount} = splices[i];
|
179 | mergeSplice(repeat.__queuedSplices, index, removed, addedCount);
|
180 | }
|
181 |
|
182 | repeat.__array = array.slice(0);
|
183 | return;
|
184 | }
|
185 |
|
186 |
|
187 | let maybePromise = this._runSplices(repeat, array.slice(0), splices);
|
188 | if (maybePromise instanceof Promise) {
|
189 | let queuedSplices = repeat.__queuedSplices = [];
|
190 |
|
191 | let runQueuedSplices = () => {
|
192 | if (!queuedSplices.length) {
|
193 | repeat.__queuedSplices = undefined;
|
194 | repeat.__array = undefined;
|
195 | return;
|
196 | }
|
197 |
|
198 | let nextPromise = this._runSplices(repeat, repeat.__array, queuedSplices) || Promise.resolve();
|
199 | queuedSplices = repeat.__queuedSplices = [];
|
200 | nextPromise.then(runQueuedSplices);
|
201 | };
|
202 |
|
203 | maybePromise.then(runQueuedSplices);
|
204 | }
|
205 | }
|
206 |
|
207 | |
208 |
|
209 |
|
210 |
|
211 |
|
212 |
|
213 |
|
214 |
|
215 |
|
216 |
|
217 |
|
218 | _runSplices(repeat, array, splices) {
|
219 | let removeDelta = 0;
|
220 | let rmPromises = [];
|
221 |
|
222 | for (let i = 0, ii = splices.length; i < ii; ++i) {
|
223 | let splice = splices[i];
|
224 | let removed = splice.removed;
|
225 |
|
226 | for (let j = 0, jj = removed.length; j < jj; ++j) {
|
227 |
|
228 | let viewOrPromise = repeat.removeView(splice.index + removeDelta + rmPromises.length, true);
|
229 | if (viewOrPromise instanceof Promise) {
|
230 | rmPromises.push(viewOrPromise);
|
231 | }
|
232 | }
|
233 | removeDelta -= splice.addedCount;
|
234 | }
|
235 |
|
236 | if (rmPromises.length > 0) {
|
237 | return Promise.all(rmPromises).then(() => {
|
238 | let spliceIndexLow = this._handleAddedSplices(repeat, array, splices);
|
239 | updateOverrideContexts(repeat.views(), spliceIndexLow);
|
240 | });
|
241 | }
|
242 |
|
243 | let spliceIndexLow = this._handleAddedSplices(repeat, array, splices);
|
244 | updateOverrideContexts(repeat.views(), spliceIndexLow);
|
245 |
|
246 | return undefined;
|
247 | }
|
248 |
|
249 | |
250 |
|
251 |
|
252 | _handleAddedSplices(repeat, array, splices) {
|
253 | let spliceIndex: number;
|
254 | let spliceIndexLow: number;
|
255 | let arrayLength = array.length;
|
256 | for (let i = 0, ii = splices.length; i < ii; ++i) {
|
257 | let splice = splices[i];
|
258 | let addIndex = spliceIndex = splice.index;
|
259 | let end = splice.index + splice.addedCount;
|
260 |
|
261 | if (typeof spliceIndexLow === 'undefined' || spliceIndexLow === null || spliceIndexLow > splice.index) {
|
262 | spliceIndexLow = spliceIndex;
|
263 | }
|
264 |
|
265 | for (; addIndex < end; ++addIndex) {
|
266 | let overrideContext = createFullOverrideContext(repeat, array[addIndex], addIndex, arrayLength);
|
267 | repeat.insertView(addIndex, overrideContext.bindingContext, overrideContext);
|
268 | }
|
269 | }
|
270 |
|
271 | return spliceIndexLow;
|
272 | }
|
273 | }
|