prepare.js
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import {
getDevice
} from './utils/helper'
const {
windowWidth
} = getDevice()
export default function prepare () {
const self = this
// v1.4.0 版本中将不再自动绑定we-cropper实例
self.attachPage = () => {
const pages = getCurrentPages()
// 获取到当前page上下文
const pageContext = pages[pages.length - 1]
// 把this依附在Page上下文的wecropper属性上，便于在page钩子函数中访问
Object.defineProperty(pageContext, 'wecropper', {
get () {
console.warn(
'Instance will not be automatically bound to the page after v1.4.0\n\n' +
'Please use a custom instance name instead\n\n' +
'Example: \n' +
'this.mycropper = new WeCropper(options)\n\n' +
'// ...\n' +
'this.mycropper.getCropperImage()'
)
return self
}
})
}
self.createCtx = () => {
const {
id,
targetId
} = self
if (id) {
self.ctx = self.ctx || wx.createCanvasContext(id)
self.targetCtx = self.targetCtx || wx.createCanvasContext(targetId)
} else {
console.error(`constructor: create canvas context failed, 'id' must be valuable`)
}
}
self.deviceRadio = windowWidth / 750
}