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import Calendar from '../Calendar'
import View from '../View'
import Theme from '../theme/Theme'
import { DateEnv } from '../datelib/env'
let guid = 0
export interface ComponentContext {
options: any
dateEnv: DateEnv
theme: Theme
calendar: Calendar
view: View
}
export type EqualityFuncHash = { [propName: string]: (obj0, obj1) => boolean }
export default class Component<PropsType> {
equalityFuncs: EqualityFuncHash // can't initialize here. done below...
uid: string
props: PropsType | null
// context vars
context: ComponentContext
dateEnv: DateEnv
theme: Theme
view: View
calendar: Calendar
isRtl: boolean
constructor(context: ComponentContext, isView?: boolean) {
// HACK to populate view at top of component instantiation call chain
if (isView) {
context.view = this as any
}
this.uid = String(guid++)
this.context = context
this.dateEnv = context.dateEnv
this.theme = context.theme
this.view = context.view
this.calendar = context.calendar
this.isRtl = this.opt('dir') === 'rtl'
}
static addEqualityFuncs(newFuncs: EqualityFuncHash) {
this.prototype.equalityFuncs = {
...this.prototype.equalityFuncs,
...newFuncs
}
}
opt(name) {
return this.context.options[name]
}
receiveProps(props: PropsType) {
let { anyChanges, comboProps } = recycleProps(this.props || {}, props, this.equalityFuncs)
this.props = comboProps
if (anyChanges) {
this.render(comboProps)
}
}
protected render(props: PropsType) {
}
// after destroy is called, this component won't ever be used again
destroy() {
}
}
Component.prototype.equalityFuncs = {}
/*
Reuses old values when equal. If anything is unequal, returns newProps as-is.
Great for PureComponent, but won't be feasible with React, so just eliminate and use React's DOM diffing.
*/
function recycleProps(oldProps, newProps, equalityFuncs: EqualityFuncHash) {
let comboProps = {} as any // some old, some new
let anyChanges = false
for (let key in newProps) {
if (
key in oldProps && (
oldProps[key] === newProps[key] ||
(equalityFuncs[key] && equalityFuncs[key](oldProps[key], newProps[key]))
)
) {
// equal to old? use old prop
comboProps[key] = oldProps[key]
} else {
comboProps[key] = newProps[key]
anyChanges = true
}
}
for (let key in oldProps) {
if (!(key in newProps)) {
anyChanges = true
break
}
}
return { anyChanges, comboProps }
}