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Implement basic element handles (puppeteer#248)
This patch implements basic element handles which a backed with remote objects. Fixes puppeteer#111
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /** | ||
| * Copyright 2017 Google Inc. 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. | ||
| */ | ||
| const helper = require('./helper'); | ||
|
|
||
| class ElementHandle { | ||
| /** | ||
| * @param {!Connection} client | ||
| * @param {!Object} remoteObject | ||
| * @param {!Mouse} mouse | ||
| */ | ||
| constructor(client, remoteObject, mouse) { | ||
| this._client = client; | ||
| this._remoteObject = remoteObject; | ||
| this._mouse = mouse; | ||
| this._released = false; | ||
| } | ||
|
|
||
| /** | ||
| * @return {!Promise} | ||
| */ | ||
| async release() { | ||
| if (this._released) | ||
| return; | ||
| this._released = true; | ||
| await helper.releaseObject(this._client, this._remoteObject); | ||
| } | ||
|
|
||
| /** | ||
| * @param {function()} pageFunction | ||
| * @param {!Array<*>} args | ||
| * @return {!Promise<(!Object|undefined)>} | ||
| */ | ||
| async evaluate(pageFunction, ...args) { | ||
| console.assert(!this._released, 'ElementHandle is released!'); | ||
| console.assert(typeof pageFunction === 'function', 'First argument to ElementHandle.evaluate must be a function!'); | ||
|
|
||
| let stringifiedArgs = ['this']; | ||
| stringifiedArgs.push(...args.map(x => JSON.stringify(x))); | ||
| let functionDeclaration = `function() { return (${pageFunction})(${stringifiedArgs.join(',')}) }`; | ||
| const objectId = this._remoteObject.objectId; | ||
| let { exceptionDetails, result: remoteObject } = await this._client.send('Runtime.callFunctionOn', { objectId, functionDeclaration, returnByValue: false}); | ||
| if (exceptionDetails) | ||
| throw new Error('Evaluation failed: ' + helper.getExceptionMessage(exceptionDetails)); | ||
| return await helper.serializeRemoteObject(this._client, remoteObject); | ||
| } | ||
|
|
||
| /** | ||
| * @return {!Promise<{x: number, y: number}>} | ||
| */ | ||
| async _visibleCenter() { | ||
| let center = await this.evaluate(element => { | ||
| if (!element.ownerDocument.contains(element)) | ||
| return null; | ||
| element.scrollIntoViewIfNeeded(); | ||
| let rect = element.getBoundingClientRect(); | ||
| return { | ||
| x: (Math.max(rect.left, 0) + Math.min(rect.right, window.innerWidth)) / 2, | ||
| y: (Math.max(rect.top, 0) + Math.min(rect.bottom, window.innerHeight)) / 2 | ||
| }; | ||
| }); | ||
| if (!center) | ||
| throw new Error('No node found for selector: ' + selector); | ||
| return center; | ||
| } | ||
|
|
||
| /** | ||
| * @return {!Promise} | ||
| */ | ||
| async hover() { | ||
| let {x, y} = await this._visibleCenter(); | ||
| await this._mouse.move(x, y); | ||
| } | ||
|
|
||
| /** | ||
| * @param {!Object=} options | ||
| * @return {!Promise} | ||
| */ | ||
| async click(options) { | ||
| let {x, y} = await this._visibleCenter(); | ||
| await this._mouse.click(x, y, options); | ||
| } | ||
| } | ||
|
|
||
| module.exports = ElementHandle; | ||
| helper.tracePublicAPI(ElementHandle); |
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