91 lines
2.5 KiB
JavaScript
91 lines
2.5 KiB
JavaScript
'use strict'
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const { createDesktopCapturer } = process.electronBinding('desktop_capturer')
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const deepEqual = (a, b) => JSON.stringify(a) === JSON.stringify(b)
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let currentlyRunning = []
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exports.getSources = (event, captureWindow, captureScreen, thumbnailSize, fetchWindowIcons) => {
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const options = {
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captureWindow,
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captureScreen,
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thumbnailSize,
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fetchWindowIcons
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}
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for (const running of currentlyRunning) {
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if (deepEqual(running.options, options)) {
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// If a request is currently running for the same options
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// return that promise
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return running.getSources
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}
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}
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const getSources = new Promise((resolve, reject) => {
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const stopRunning = () => {
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// Remove from currentlyRunning once we resolve or reject
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currentlyRunning = currentlyRunning.filter(running => running.options !== options)
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}
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const request = {
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options,
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resolve: (value) => {
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stopRunning()
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resolve(value)
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},
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reject: (err) => {
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stopRunning()
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reject(err)
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},
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capturer: createDesktopCapturer()
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}
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request.capturer.emit = createCapturerEmitHandler(request.capturer, request)
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request.capturer.startHandling(captureWindow, captureScreen, thumbnailSize, fetchWindowIcons)
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// If the WebContents is destroyed before receiving result, just remove the
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// reference to resolve, emit and the capturer itself so that it never dispatches
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// back to the renderer
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event.sender.once('destroyed', () => {
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request.resolve = null
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delete request.capturer.emit
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delete request.capturer
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stopRunning()
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})
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})
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currentlyRunning.push({
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options,
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getSources
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})
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return getSources
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}
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const createCapturerEmitHandler = (capturer, request) => {
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return function handlEmitOnCapturer (event, name, sources, fetchWindowIcons) {
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// Ensure that this capturer instance can only ever receive a single event
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// if we get more than one it is a bug but will also cause strange behavior
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// if we still try to handle it
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delete capturer.emit
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if (name === 'error') {
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const error = sources
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request.reject(error)
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return
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}
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const result = sources.map(source => {
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return {
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id: source.id,
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name: source.name,
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thumbnail: source.thumbnail.toDataURL(),
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display_id: source.display_id,
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appIcon: (fetchWindowIcons && source.appIcon) ? source.appIcon.toDataURL() : null
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}
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})
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if (request.resolve) {
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request.resolve(result)
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}
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}
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}
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