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preload.ts
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preload.ts
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import { contextBridge, ipcRenderer } from 'electron'
// --------- Expose some API to the Renderer process ---------
contextBridge.exposeInMainWorld('ipcRenderer', withPrototype(ipcRenderer))
// `exposeInMainWorld` can't detect attributes and methods of `prototype`, manually patching it.
function withPrototype(obj: Record<string, any>) {
const protos = Object.getPrototypeOf(obj)
for (const [key, value] of Object.entries(protos)) {
if (Object.prototype.hasOwnProperty.call(obj, key)) continue
if (typeof value === 'function') {
// Some native APIs, like `NodeJS.EventEmitter['on']`, don't work in the Renderer process. Wrapping them into a function.
obj[key] = function (...args: any) {
return value.call(obj, ...args)
}
} else {
obj[key] = value
}
}
return obj
}
// --------- Preload scripts loading ---------
function domReady(condition: DocumentReadyState[] = ['complete', 'interactive']) {
return new Promise(resolve => {
if (condition.includes(document.readyState)) {
resolve(true)
} else {
document.addEventListener('readystatechange', () => {
if (condition.includes(document.readyState)) {
resolve(true)
}
})
}
})
}
const safeDOM = {
append(parent: HTMLElement, child: HTMLElement) {
if (!Array.from(parent.children).find(e => e === child)) {
parent.appendChild(child)
}
},
remove(parent: HTMLElement, child: HTMLElement) {
if (Array.from(parent.children).find(e => e === child)) {
parent.removeChild(child)
}
},
}
/**
* https://tobiasahlin.com/spinkit
* https://connoratherton.com/loaders
* https://projects.lukehaas.me/css-loaders
* https://matejkustec.github.io/SpinThatShit
*/
function useLoading() {
const className = `loaders-css__square-spin`
const styleContent = `
@keyframes square-spin {
25% { transform: perspective(100px) rotateX(180deg) rotateY(0); }
50% { transform: perspective(100px) rotateX(180deg) rotateY(180deg); }
75% { transform: perspective(100px) rotateX(0) rotateY(180deg); }
100% { transform: perspective(100px) rotateX(0) rotateY(0); }
}
.${className} > div {
animation-fill-mode: both;
width: 50px;
height: 50px;
background: #fff;
animation: square-spin 3s 0s cubic-bezier(0.09, 0.57, 0.49, 0.9) infinite;
}
.app-loading-wrap {
position: fixed;
top: 0;
left: 0;
width: 100vw;
height: 100vh;
display: flex;
align-items: center;
justify-content: center;
background: #282c34;
z-index: 9;
}
`
const oStyle = document.createElement('style')
const oDiv = document.createElement('div')
oStyle.id = 'app-loading-style'
oStyle.innerHTML = styleContent
oDiv.className = 'app-loading-wrap'
oDiv.innerHTML = `<div class="${className}"><div></div></div>`
return {
appendLoading() {
safeDOM.append(document.head, oStyle)
safeDOM.append(document.body, oDiv)
},
removeLoading() {
safeDOM.remove(document.head, oStyle)
safeDOM.remove(document.body, oDiv)
},
}
}
// ----------------------------------------------------------------------
const { appendLoading, removeLoading } = useLoading()
domReady().then(appendLoading)
window.onmessage = ev => {
ev.data.payload === 'removeLoading' && removeLoading()
}
setTimeout(removeLoading, 4999)