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test-fixed-layer.js
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/**
* Copyright 2016 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {AmpDocSingle, installDocService} from '../../src/service/ampdoc-impl';
import {FakeMutationObserver, FakeWindow} from '../../testing/fake-dom';
import {FixedLayer} from '../../src/service/fixed-layer';
import {Services} from '../../src/services';
import {endsWith} from '../../src/string';
import {installHiddenObserverForDoc} from '../../src/service/hidden-observer-impl';
import {installPlatformService} from '../../src/service/platform-impl';
import {installTimerService} from '../../src/service/timer-impl';
import {toggle} from '../../src/style';
import {toggleExperiment} from '../../src/experiments';
import {user} from '../../src/log';
describes.sandboxed('FixedLayer', {}, () => {
let documentApi;
let ampdoc;
let vsyncApi;
let vsyncTasks;
let docBody, docElem;
let element1;
let element2;
let element3;
let element4;
let element5;
let element6;
let allRules;
let timer;
beforeEach(() => {
documentApi = {};
allRules = {};
docBody = createElement('docBody');
docBody.id = 'doc-body-id';
docElem = createElement('docElem');
element1 = createElement('element1');
element2 = createElement('element2');
element3 = createElement('element3');
element4 = createElement('element4');
element5 = createElement('element5');
element6 = createElement('element6');
docBody.appendChild(element1);
docBody.appendChild(element2);
docBody.appendChild(element3);
docBody.appendChild(element4);
docBody.appendChild(element5);
docBody.appendChild(element6);
const invalidRule = createValidRule('#invalid', 'fixed', [
element1,
element3,
]);
Object.assign(documentApi, {
styleSheets: [
// Will be ignored due to being a link.
{
ownerNode: document.createElement('link'),
cssRules: [invalidRule],
},
// Will be ignored because it's disabled
{
ownerNode: createStyleNode(),
disabled: true,
cssRules: [invalidRule],
},
// Will be ignored because it's a boilerplate
{
ownerNode: createStyleNode('amp-boilerplate'),
cssRules: [invalidRule],
},
// Will be ignored because it's a runtime
{
ownerNode: createStyleNode('amp-runtime'),
cssRules: [invalidRule],
},
// Will be ignored because it's an extension
{
ownerNode: createStyleNode('amp-extension', 'amp-fit-text'),
cssRules: [invalidRule],
},
// Valid stylesheet with amp-custom
{
ownerNode: createStyleNode('amp-custom'),
cssRules: [
createValidRule('#amp-custom-rule1', 'fixed', [element1]),
createValidRule('#doc-body-id #amp-custom-rule1', 'fixed', [
element1,
]),
createValidRule('#amp-custom-rule2', 'fixed', [element1, element2]),
createUnrelatedRule('#amp-custom-rule3', [element3]),
createValidRule('#amp-custom-rule4', 'sticky', [
element2,
element4,
]),
createValidRule('#amp-custom-rule5', '-webkit-sticky', [element5]),
{
type: 4,
cssRules: [
createValidRule('#amp-custom-media-rule1', 'fixed', [element1]),
],
},
{
type: 12,
cssRules: [
createValidRule('#amp-custom-supports-rule1', 'fixed', [
element2,
]),
],
},
// Unknown rule.
{
type: 3,
},
],
},
// Valid stylesheet without amp-custom
{
ownerNode: createStyleNode(),
cssRules: [
createValidRule('#other-rule1', 'fixed', [element1]),
createValidRule('#other-rule2', 'fixed', [element2]),
createUnrelatedRule('#other-rule3', [element1, element3]),
],
},
],
querySelectorAll: selector => {
if (!allRules[selector]) {
return null;
}
return allRules[selector].elements;
},
contains: elem => {
return !!elem.parentElement;
},
defaultView: {
setTimeout: window.setTimeout,
clearTimeout: window.clearTimeout,
Promise: window.Promise,
MutationObserver: FakeMutationObserver,
getComputedStyle: elem => {
return elem.computedStyle;
},
navigator: window.navigator,
location: window.location,
cookie: '',
},
createElement: name => {
return createElement(name);
},
documentElement: docElem,
body: docBody,
});
documentApi.defaultView.document = documentApi;
installDocService(documentApi.defaultView, /* isSingleDoc */ true);
ampdoc = Services.ampdocServiceFor(documentApi.defaultView).getSingleDoc();
installHiddenObserverForDoc(ampdoc);
installPlatformService(documentApi.defaultView);
installTimerService(documentApi.defaultView);
timer = Services.timerFor(documentApi.defaultView);
vsyncTasks = [];
vsyncApi = {
runPromise: task => {
vsyncTasks.push(task);
return Promise.resolve();
},
mutate: mutator => {
vsyncTasks.push({mutate: mutator});
},
};
});
class FakeAttributes {
constructor() {
const attrs = [];
attrs.setNamedItem = function({name, value}) {
for (let i = 0; i < this.length; i++) {
if (this[i].name === name) {
this[i].value = value;
return;
}
}
this.push(new FakeAttr(name, value));
};
return attrs;
}
}
class FakeAttr {
constructor(name, value) {
this.name = name;
this.value = value;
}
cloneNode() {
return new FakeAttr(this.name, this.value);
}
}
function createElement(id) {
const children = [];
const elem = {
id,
nodeType: 1,
ownerDocument: documentApi,
autoTop: '',
tagName: id,
toString: () => {
return id;
},
style: {
_top: '15px',
_bottom: '',
_position: '',
_opacity: '0.9',
_visibility: 'visible',
_transition: '',
get top() {
return this._top;
},
set top(v) {
elem.style.setProperty('top', v);
},
get bottom() {
return this._bottom;
},
set bottom(v) {
elem.style.setProperty('bottom', v);
},
get position() {
return this._position;
},
set position(v) {
elem.style.setProperty('position', v);
},
get opacity() {
return this._opacity;
},
set opacity(v) {
elem.style.setProperty('opacity', v);
},
get visibility() {
return this._visibility;
},
set visibility(v) {
elem.style.setProperty('visibility', v);
},
get transition() {
return this._transition;
},
set transition(v) {
elem.style.setProperty('transition', v);
},
setProperty(prop, value, priority) {
const privProp = '_' + prop;
// Override if important
if (priority === 'important') {
elem.style[privProp] = `${value} !${priority}`;
} else if (
elem.style[privProp] ||
!endsWith(elem.computedStyle[prop], '!important')
) {
if (
prop === 'transition' &&
!value &&
endsWith(elem.style[privProp] || '', '!important')
) {
// Emulate a stupid Safari bug.
// noop.
} else {
// If element style is already set, we can override
// Or, if computed style is not important priority
elem.style[privProp] = value;
}
}
},
},
computedStyle: {
opacity: '0.9',
visibility: 'visible',
_top: '',
get top() {
if (
elem.computedStyle.transition &&
elem.style.transition !== '' &&
elem.style.transition !== 'none !important'
) {
return this._oldTop;
}
if (elem.style.bottom) {
return elem.autoTop || this._top;
}
return this._top;
},
set top(val) {
this._oldTop = this._top;
this._top = val;
},
bottom: '',
zIndex: '',
transform: '',
position: '',
transition: '',
},
matches: () => true,
compareDocumentPosition: other => {
if (other.id > id) {
return Node.DOCUMENT_POSITION_FOLLOWING;
}
return Node.DOCUMENT_POSITION_PRECEDING;
},
contains(elem) {
let el = elem;
while (el) {
if (el === this) {
return true;
}
el = el.parentElement;
}
return false;
},
hasAttribute(name) {
for (let i = 0; i < this.attributes.length; i++) {
if (this.attributes[i].name === name) {
return true;
}
}
return false;
},
getAttribute(name) {
for (let i = 0; i < this.attributes.length; i++) {
if (this.attributes[i].name === name) {
return this.attributes[i].value;
}
}
return null;
},
setAttribute(name, value) {
if (name.includes('[')) {
throw new Error('invalid characters');
}
for (let i = 0; i < this.attributes.length; i++) {
if (this.attributes[i].name === name) {
this.attributes[i].value = value;
return;
}
}
this.attributes.push(new FakeAttr(name, value));
},
removeAttribute(name) {
for (let i = 0; i < this.attributes.length; i++) {
if (this.attributes[i].name === name) {
this.attributes.splice(i, 1);
return;
}
}
},
attributes: new FakeAttributes(),
appendChild: child => {
child.parentElement = elem;
children.push(child);
},
removeChild: child => {
const index = children.indexOf(child);
if (index != -1) {
children.splice(index, 1);
}
child.parentElement = null;
},
replaceChild: (newChild, oldChild) => {
oldChild.parentElement = null;
if (children.indexOf(oldChild) != -1) {
children.splice(children.indexOf(oldChild), 1);
}
newChild.parentElement = elem;
children.push(newChild);
},
cloneNode() {
return createElement(this.id);
},
get offsetTop() {
return parseFloat(elem.computedStyle.top);
},
set innerHTML(html) {
if (html === '') {
this.firstElementChild = null;
return;
}
// Updating the placeholder means we have to update the tests.
expect(html.trim()).to.equal(
'<i-amphtml-fpa style="display: none"></i-amphtml-fpa>'
);
this.firstElementChild = createElement('i-amphtml-fpa');
toggle(this.firstElementChild, false);
},
getRootNode() {
return documentApi;
},
dispatchEvent() {},
};
return elem;
}
function createStyleNode(attr, value) {
const node = document.createElement('style');
if (attr) {
node.setAttribute(attr, value || '');
}
return node;
}
function createValidRule(selector, position, elements) {
const rule = {
type: 1,
selectorText: selector,
style: {position},
elements,
};
if (allRules[selector]) {
throw new Error('dup selector');
}
allRules[selector] = rule;
return rule;
}
function createUnrelatedRule(selector, elements) {
const rule = {
type: 1,
selectorText: selector,
style: {},
elements,
};
if (allRules[selector]) {
throw new Error('dup selector');
}
allRules[selector] = rule;
return rule;
}
// TODO(jridgewell, #11827): Make this test work on Safari.
describe
.configure()
.skipSafari()
.run('no-transfer', () => {
let fixedLayer;
beforeEach(() => {
fixedLayer = new FixedLayer(
ampdoc,
vsyncApi,
/* borderTop */ 0,
/* paddingTop */ 11,
/* transfer */ false
);
fixedLayer.setup();
});
it('should initialize fixed layer to null', () => {
expect(fixedLayer.transferLayer_).to.be.null;
});
it('should discover all potentials', () => {
function expectFe(actual, expected) {
expect(actual.id).to.equal(expected.id, `${expected.id} wrong`);
expect(actual.element).to.equal(
expected.element,
`${expected.id}: wrong element`
);
expect(actual.position).to.equal(
expected.position,
`${expected.id}: wrong position`
);
expect(JSON.stringify(actual.selectors)).to.equal(
JSON.stringify(expected.selectors),
`${expected.id}: wrong selectors`
);
}
expect(fixedLayer.elements_).to.have.length(5);
expectFe(fixedLayer.elements_[0], {
id: 'F0',
element: element1,
position: 'fixed',
selectors: [
'#amp-custom-rule1',
'#doc-body-id #amp-custom-rule1',
'#amp-custom-rule2',
'#amp-custom-media-rule1',
'#other-rule1',
],
});
expectFe(fixedLayer.elements_[1], {
id: 'F1',
element: element2,
position: 'fixed',
selectors: [
'#amp-custom-rule2',
'#amp-custom-supports-rule1',
'#other-rule2',
],
});
expectFe(fixedLayer.elements_[2], {
id: 'F2',
element: element2,
position: 'sticky',
selectors: ['#amp-custom-rule4'],
});
expectFe(fixedLayer.elements_[3], {
id: 'F3',
element: element4,
position: 'sticky',
selectors: ['#amp-custom-rule4'],
});
expectFe(fixedLayer.elements_[4], {
id: 'F4',
element: element5,
position: 'sticky',
selectors: ['#amp-custom-rule5'],
});
expect(fixedLayer.isDeclaredFixed(element1)).to.be.true;
expect(fixedLayer.isDeclaredSticky(element1)).to.be.false;
expect(fixedLayer.isDeclaredFixed(element2)).to.be.true;
expect(fixedLayer.isDeclaredSticky(element2)).to.be.true;
expect(fixedLayer.isDeclaredFixed(element3)).to.be.false;
expect(fixedLayer.isDeclaredSticky(element3)).to.be.false;
expect(fixedLayer.isDeclaredSticky(element4)).to.be.true;
expect(fixedLayer.isDeclaredSticky(element5)).to.be.true;
});
it('should add and remove element directly', () => {
const updateStub = sandbox.stub(fixedLayer, 'update');
expect(fixedLayer.elements_).to.have.length(5);
// Add.
fixedLayer.addElement(element6);
expect(updateStub).to.be.calledOnce;
expect(fixedLayer.elements_).to.have.length(6);
const fe = fixedLayer.elements_[5];
expect(fe.id).to.equal('F5');
expect(fe.element).to.equal(element6);
expect(fe.selectors).to.deep.equal(['*']);
expect(fe.forceTransfer).to.be.undefined;
// Remove.
fixedLayer.removeElement(element6);
expect(fixedLayer.elements_).to.have.length(5);
// Add with forceTransfer=true.
fixedLayer.addElement(element6, true);
expect(updateStub).to.have.callCount(2);
expect(fixedLayer.elements_).to.have.length(6);
const fe1 = fixedLayer.elements_[5];
expect(fe1.id).to.equal('F6');
expect(fe1.element).to.equal(element6);
expect(fe1.selectors).to.deep.equal(['*']);
expect(fe1.forceTransfer).to.be.true;
// Remove.
fixedLayer.removeElement(element6);
expect(fixedLayer.elements_).to.have.length(5);
// Add with forceTransfer=false.
fixedLayer.addElement(element6, false);
expect(updateStub).to.have.callCount(3);
expect(fixedLayer.elements_).to.have.length(6);
const fe2 = fixedLayer.elements_[5];
expect(fe2.id).to.equal('F7');
expect(fe2.element).to.equal(element6);
expect(fe2.selectors).to.deep.equal(['*']);
expect(fe2.forceTransfer).to.be.false;
// Remove.
fixedLayer.removeElement(element6);
expect(fixedLayer.elements_).to.have.length(5);
});
it('should remove node when disappeared from DOM', () => {
docBody.removeChild(element1);
expect(fixedLayer.elements_).to.have.length(5);
fixedLayer.update();
expect(fixedLayer.elements_).to.have.length(4);
});
it('should remove all candidates', () => {
// element2 is both fixed and sticky.
docBody.removeChild(element2);
expect(fixedLayer.elements_).to.have.length(5);
fixedLayer.update();
expect(fixedLayer.elements_).to.have.length(3);
});
it('should collect updates', () => {
element1.computedStyle['position'] = 'fixed';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
// F0: element1
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].sticky).to.be.false;
expect(state['F0'].top).to.equal('');
expect(state['F0'].zIndex).to.equal('');
// F1: element2
expect(state['F1'].fixed).to.equal(false);
expect(state['F1'].sticky).to.equal(false);
// F2: element3
expect(state['F2'].fixed).to.equal(false);
expect(state['F2'].sticky).to.equal(false);
// F3: element4
expect(state['F3'].fixed).to.be.false;
expect(state['F3'].sticky).to.be.false;
expect(state['F3'].top).to.equal('');
expect(state['F3'].zIndex).to.equal('');
// F4: element5
expect(state['F4'].fixed).to.be.false;
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('');
expect(state['F4'].zIndex).to.equal('');
});
it('should support vendor-based sticky', () => {
element5.computedStyle['position'] = '-webkit-sticky';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F4'].sticky).to.be.true;
});
it('should disregard non-fixed position', () => {
element1.computedStyle['position'] = 'static';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'static';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.false;
expect(state['F1'].fixed).to.be.false;
expect(state['F4'].fixed).to.be.false;
});
it('should disregard invisible element, but for fixed only', () => {
element1.computedStyle['position'] = 'fixed';
element1.offsetWidth = 0;
element1.offsetHeight = 0;
element5.computedStyle['position'] = 'sticky';
element5.offsetWidth = 0;
element5.offsetHeight = 0;
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.false;
expect(state['F1'].fixed).to.be.false;
expect(state['F4'].sticky).to.be.true;
});
it('should disregard display:none element', () => {
element1.computedStyle['position'] = 'fixed';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element1.computedStyle['display'] = 'none';
element5.computedStyle['position'] = 'sticky';
element5.offsetWidth = 10;
element5.offsetHeight = 10;
element5.computedStyle['display'] = 'none';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.false;
expect(state['F1'].fixed).to.be.false;
expect(state['F4'].sticky).to.be.false;
});
it('should tolerate getComputedStyle = null', () => {
// See #3096 and https://bugzilla.mozilla.org/show_bug.cgi?id=548397
documentApi.defaultView.getComputedStyle = () => null;
element1.computedStyle['position'] = 'fixed';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.false;
expect(state['F0'].sticky).to.be.false;
expect(state['F0'].transferrable).to.be.false;
expect(state['F0'].top).to.equal('');
expect(state['F0'].zIndex).to.equal('');
expect(state['F1'].fixed).to.be.false;
expect(state['F1'].sticky).to.be.false;
});
it('should collect for top != auto', () => {
element1.computedStyle['position'] = 'fixed';
element1.computedStyle['top'] = '11px';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = '11px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].sticky).to.be.false;
expect(state['F0'].top).to.equal('11px');
expect(state['F4'].fixed).to.be.false;
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('11px');
});
it('should collect for top = auto, but not update top', () => {
element1.computedStyle['position'] = 'fixed';
element1.computedStyle['top'] = 'auto';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = 'auto';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].sticky).to.be.false;
expect(state['F0'].top).to.equal('');
expect(state['F4'].fixed).to.be.false;
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('');
});
it('should work around top=0 for sticky', () => {
// See http://crbug.com/703816.
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = '0px';
element5.autoTop = '12px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('');
});
it('should work around top=0 for sticky when offset = 0', () => {
// See http://crbug.com/703816.
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = '0px';
element5.autoTop = '0px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('0px');
});
it('should NOT work around top=0 for sticky for non-implicit top', () => {
// See http://crbug.com/703816.
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = '0px';
element5.autoTop = '12px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('');
});
it('should collect for implicit top = auto, but not update top', () => {
element1.computedStyle['position'] = 'fixed';
element1.computedStyle['top'] = '0px';
element1.autoTop = '12px';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
element5.autoTop = '12px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].top).to.equal('');
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('');
});
it('should override implicit top = auto to 0 when equals padding', () => {
element1.computedStyle['position'] = 'fixed';
element1.computedStyle['top'] = '11px';
element1.autoTop = '0px';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = '11px';
element5.autoTop = '11px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].top).to.equal('0px');
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('11px');
});
it('should override implicit top = auto to 0 and padding + border', () => {
fixedLayer.borderTop_ = 1;
element1.computedStyle['position'] = 'fixed';
element1.computedStyle['top'] = '12px';
element1.autoTop = '0px';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = '12px';
element5.autoTop = '12px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].top).to.equal('0px');
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('12px');
});
it('should override implicit top = auto to 0 w/transient padding', () => {
element1.computedStyle['position'] = 'fixed';
element1.computedStyle['top'] = '11px';
element1.autoTop = '0px';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = '11px';
element5.autoTop = '11px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.equal(true);
expect(state['F0'].top).to.equal('0px');
// Update to transient padding.
sandbox.stub(fixedLayer, 'update').callsFake(() => {});
fixedLayer.updatePaddingTop(22, /* transient */ true);
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].top).to.equal('0px');
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('11px');
expect(fixedLayer.paddingTop_).to.equal(22);
expect(fixedLayer.committedPaddingTop_).to.equal(11);
// Update to non-transient padding.
fixedLayer.updatePaddingTop(22, /* transient */ false);
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].top).to.equal(''); // Reset completely.
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('11px');
expect(fixedLayer.paddingTop_).to.equal(22);
expect(fixedLayer.committedPaddingTop_).to.equal(22);
});
it('should always collect and update top = 0', () => {
element1.computedStyle['position'] = 'fixed';
element1.computedStyle['top'] = '0px';
element1.autoTop = '0px';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['top'] = '0px';
element5.autoTop = '0px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].top).to.equal('0px');
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('0px');
});
it('should handle transitions', () => {
element1.computedStyle['position'] = 'fixed';
element1.computedStyle['transition'] = 'all .4s ease';
element1.computedStyle['top'] = '0px';
element1.autoTop = '0px';
element1.offsetWidth = 10;
element1.offsetHeight = 10;
element5.computedStyle['position'] = 'sticky';
element5.computedStyle['transition'] = 'all .4s ease';
element5.computedStyle['top'] = '0px';
element5.autoTop = '0px';
expect(vsyncTasks).to.have.length(1);
const state = {};
vsyncTasks[0].measure(state);
expect(state['F0'].fixed).to.be.true;
expect(state['F0'].top).to.equal('0px');
expect(element1.style.transition).to.equal('none !important');
expect(state['F4'].sticky).to.be.true;
expect(state['F4'].top).to.equal('0px');
expect(element5.style.transition).to.equal('none !important');
vsyncTasks[0].mutate({});
expect(element1.style.transition).to.equal('');
expect(element5.style.transition).to.equal('');
});
it('should mutate element to fixed without top', () => {
const fe = fixedLayer.elements_[0];
fixedLayer.mutateElement_(fe, 1, {
fixed: true,
sticky: false,
top: '',
});
expect(fe.fixedNow).to.be.true;
expect(fe.stickyNow).to.be.false;
expect(fe.element.style.top).to.equal('15px');
expect(fixedLayer.transferLayer_).to.be.null;
});
it('should mutate element to sticky without top', () => {
const fe = fixedLayer.elements_[4];
fixedLayer.mutateElement_(fe, 1, {
fixed: false,
sticky: true,
top: '',
});
expect(fe.fixedNow).to.be.false;
expect(fe.stickyNow).to.be.true;
expect(fe.element.style.top).to.equal('15px');
expect(fixedLayer.transferLayer_).to.be.null;
});
it('should mutate element to fixed with top', () => {
const fe = fixedLayer.elements_[0];
element1.style.top = '';
fixedLayer.mutateElement_(fe, 1, {
fixed: true,
top: '17px',
});
expect(fe.fixedNow).to.be.true;