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react_class.go
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// Copyright 2018-20 PJ Engineering and Business Solutions Pty. Ltd. All rights reserved.
package react
import (
"github.com/gopherjs/gopherjs/js"
)
// Map is a convenience method that can be used to access fields in a
// js object.
type Map func(key string) *js.Object
// UpdaterFunc is the first argument for SetState function.
//
// See: https://reactjs.org/docs/react-component.html#setstate
type UpdaterFunc func(props, state Map) interface{}
// SetState is used to asynchronously update the state.
// If the new state is dependent on the current props or state,
// updater must be of type UpdaterFunc.
//
// See: https://reactjs.org/docs/react-component.html#setstate
type SetState func(updater interface{}, callback ...func())
// ForceUpdate will force a rerender of the component.
//
// See: https://reactjs.org/docs/react-component.html#forceupdate
func ForceUpdate(this *js.Object, callback ...func()) {
if len(callback) > 0 && callback[0] != nil {
this.Call("forceUpdate", callback[0])
} else {
this.Call("forceUpdate")
}
}
// ClassDef is used to create custom React components.
type ClassDef map[string]interface{}
// NewClassDef will create an empty class definition which can immediately be used
// to create a React component. displayName is the text that is shown in Chrome's
// React Developer Tools.
//
// Example:
//
// // Create PureComponent
// pureDef := react.NewClassDef("Pure", react.PureComponentMixin)
//
// // Create Component
// appDef := react.NewClassDef("App")
//
// See: https://reactjs.org/docs/react-api.html#reactpurecomponent
// and https://reactjs.org/docs/react-component.html
//
func NewClassDef(displayName string, mixins ...interface{}) ClassDef {
def := ClassDef{
render: js.MakeFunc(func(this *js.Object, arguments []*js.Object) interface{} {
return nil
}),
}
def["displayName"] = displayName
// Mixin support
if len(mixins) > 0 {
def["mixins"] = mixins
}
return def
}
func (def ClassDef) setMethod(static bool, name string, f func(this *js.Object, props, state Map, setState SetState, arguments []*js.Object) interface{}) {
const statics = "statics"
const mixins = "mixins"
if f == nil {
// Clear method
if static {
if _, exists := def[statics]; exists {
switch s := def[statics].(type) {
case (map[string]interface{}):
delete(s, name)
default:
}
}
} else {
delete(def, name)
}
return
}
if !static && name == statics {
panic("can't have function name called 'statics'")
}
if name == mixins {
panic("can't have function name called 'mixins'")
}
x := func(this *js.Object, arguments []*js.Object) interface{} {
props := func(key string) *js.Object {
return this.Get("props").Get(key)
}
state := func(key string) *js.Object {
return this.Get("state").Get(key)
}
setState := func(updater interface{}, callback ...func()) {
if updater == nil {
return
}
if len(callback) > 0 && callback[0] != nil {
switch updater := updater.(type) {
case func(props, state Map) interface{}:
this.Call("setState", func(state *js.Object, props *js.Object) interface{} {
return SToMap(updater(func(key string) *js.Object {
return props.Get(key)
}, func(key string) *js.Object {
return state.Get(key)
}))
}, callback[0])
case UpdaterFunc:
this.Call("setState", func(state *js.Object, props *js.Object) interface{} {
return SToMap(updater(func(key string) *js.Object {
return props.Get(key)
}, func(key string) *js.Object {
return state.Get(key)
}))
}, callback[0])
default:
this.Call("setState", SToMap(updater), callback[0])
}
} else {
switch updater := updater.(type) {
case func(props, state Map) interface{}:
this.Call("setState", func(state *js.Object, props *js.Object) interface{} {
return SToMap(updater(func(key string) *js.Object {
return props.Get(key)
}, func(key string) *js.Object {
return state.Get(key)
}))
})
case UpdaterFunc:
this.Call("setState", func(state *js.Object, props *js.Object) interface{} {
return SToMap(updater(func(key string) *js.Object {
return props.Get(key)
}, func(key string) *js.Object {
return state.Get(key)
}))
})
default:
this.Call("setState", SToMap(updater))
}
}
}
return f(this, props, state, setState, arguments)
}
if static {
if _, exists := def[statics]; exists {
(def[statics].(map[string]interface{}))[name] = js.MakeFunc(x)
} else {
def[statics] = map[string]interface{}{
name: js.MakeFunc(x),
}
}
} else {
def[name] = js.MakeFunc(x)
}
}
// SetMethod allows a custom method to be attached.
// By passing nil for f, the method can also be detached (cleared).
func (def ClassDef) SetMethod(name string, f func(this *js.Object, props, state Map, setState SetState, arguments []*js.Object) interface{}) {
def.setMethod(false, name, f)
}
// CreateClass is used to create a react component.
//
// See: https://reactjs.org/docs/react-without-es6.html
func CreateClass(def ClassDef) *js.Object {
return CreateReactClass.Invoke(def)
}