Javascript 使用Mobx商店';React类组件中的s值?
我想访问React类组件中的钩子 Konva.tsx store/FrameItContext.tsxJavascript 使用Mobx商店';React类组件中的s值?,javascript,reactjs,react-hooks,mobx,mobx-react,Javascript,Reactjs,React Hooks,Mobx,Mobx React,我想访问React类组件中的钩子 Konva.tsx store/FrameItContext.tsx import*as React from“React”; 从“mobx react”导入{useLocalObservable}; 从“/index”导入{FrameItStore}; 从“./types/index”导入{IFrameItStore}; const FrameItContext=React.createContext(新FrameItStore()); //export co
import*as React from“React”;
从“mobx react”导入{useLocalObservable};
从“/index”导入{FrameItStore};
从“./types/index”导入{IFrameItStore};
const FrameItContext=React.createContext(新FrameItStore());
//export const FrameItProvider=({children}:{children:React.ReactChild})=>{
//const frameItStore=useLocalObservable(()=>new frameItStore())
//返回{children}
// }
export const useFrameItStore=()=>React.useContext(FrameItContext);
但是,我不能在类组件中使用挂钩。我做了一个完整的沙箱→
如何访问Konva.tsx
文件中的存储?您可以设置a以访问此.context
上的上下文值
导出类Konva.Component{
// ...
静态contextType=FrameItContext;
context!:React.ContextType;
render(){
const{win}=this.context;
// ...
}
}
为什么不将宽度和高度添加为可观察值的一部分,然后根据需要更改FrameItStore.tsx中的值。您的意思是作为getter?那么如何使用updateWin
函数?我仍然不能在类组件中使用钩子,对吗?
import * as React from "react";
import { Stage, Layer } from "react-konva";
import { useFrameItStore } from "../store/index";
import { BrowserWindow, SiteImage, TrafficSignal, URLBar } from "./index";
import { Window } from "../types/index";
import { Stage as StageType } from "konva/types/Stage";
export class Konva extends React.Component {
stageRef = React.createRef<StageType>();
handleExportClick = () => {
console.log(
this.stageRef
.current!.getStage()
.toDataURL({ mimeType: "image/jpeg", quality: 1 })
);
};
render() {
// const frameItStore = useFrameItStore();
const win: Window = { width: 800, height: 600 }; // frameItStore.win;
return (
<>
<Stage width={win.width} height={win.height} ref={this.stageRef}>
<Layer>
<BrowserWindow />
<URLBar />
<TrafficSignal />
<SiteImage />
</Layer>
</Stage>
<button
style={{ position: "absolute", top: "0" }}
onClick={this.handleExportClick}
>
Download Image
</button>
</>
);
}
}
import { makeObservable, observable, action, computed } from "mobx";
import { Point, TrafficSignalPosition, IFrameItStore } from "@/types/index";
export class FrameItStore implements IFrameItStore {
id = 0;
win = {
width: window.innerWidth,
height: window.innerHeight
};
box = {
width: 1024,
height: 600
};
trafficSignalColors = [
{
close: "#EF4444",
minimize: "#FBBE25",
maximize: "#49DE80"
},
{
close: "black",
minimize: "blue",
maximize: "orange"
}
];
constructor() {
makeObservable(this, {
win: observable,
updateWin: action,
box: observable,
boxCenter: computed,
trafficSignalPosition: computed,
trafficSignalColors: observable,
id: observable
});
window.addEventListener("resize", this.updateWin);
}
updateWin() {
if (typeof window === "object") {
console.log(this.win);
console.log(window.innerWidth);
console.log(window.innerHeight);
this.win.width = window.innerWidth;
this.win.height = window.innerHeight;
}
}
destroyWin() {
window.removeEventListener("resize", this.updateWin);
}
get boxCenter(): Point {
return {
x: (this.win.width - this.box.width) / 2,
y: (this.win.height - this.box.height) / 2
};
}
get trafficSignalPosition(): TrafficSignalPosition {
return {
close: { x: this.boxCenter.x + 20, y: this.boxCenter.y + 20 },
minimize: { x: this.boxCenter.x + 2 * 20, y: this.boxCenter.y + 20 },
maximize: { x: this.boxCenter.x + 3 * 20, y: this.boxCenter.y + 20 }
};
}
}
import * as React from "react";
import { useLocalObservable } from "mobx-react";
import { FrameItStore } from "./index";
import { IFrameItStore } from "../types/index";
const FrameItContext = React.createContext<IFrameItStore>(new FrameItStore());
// export const FrameItProvider = ({ children }: { children: React.ReactChild }) => {
// const frameItStore = useLocalObservable(() => new FrameItStore())
// return <FrameItContext.Provider value={frameItStore}>{children}</FrameItContext.Provider>
// }
export const useFrameItStore = () => React.useContext(FrameItContext);