/
preact.tsx
194 lines (158 loc) · 4.29 KB
/
preact.tsx
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import { h, render, Component, ComponentProps, FunctionalComponent, AnyComponent } from "../../src/preact";
interface DummyProps {
initialInput: string;
}
interface DummyState {
input: string;
}
class DummyComponent extends Component<DummyProps, DummyState> {
constructor(props: DummyProps) {
super(props);
this.state = {
input: `x${this.props}x`
}
}
private setRef = (el: AnyComponent<any>) => {
console.log(el);
}
render({ initialInput }: DummyProps, { input }: DummyState) {
return (
<div>
<DummerComponent initialInput={initialInput} input={input} />
{/* Can specify all Preact attributes on a typed FunctionalComponent */}
<ComponentWithChildren initialInput={initialInput} input={input} key="1" ref={this.setRef} />
</div>
);
}
}
interface DummerComponentProps extends DummyProps, DummyState {
}
function DummerComponent({ input, initialInput }: DummerComponentProps) {
return <div>Input: {input}, initial: {initialInput}</div>;
}
render(h('div', { title: "test", key: "1" }), document);
render(h(DummyComponent, { initialInput: "The input", key: "1" }), document);
render(h(DummerComponent, { initialInput: "The input", input: "New input", key: "1"}), document);
// Accessing children
const ComponentWithChildren: FunctionalComponent<DummerComponentProps> = (
{ input, initialInput, children }
) => {
return <div>
<span>{initialInput}</span>
<span>{input}</span>
<span>{children}</span>
</div>
}
const UseOfComponentWithChildren = () => {
return (
<ComponentWithChildren initialInput="initial" input="input">
<span>child 1</span>
<span>child 2</span>
</ComponentWithChildren>
);
}
// using ref and or jsx
class ComponentUsingRef extends Component<any, any> {
private array: string[];
private refs: Element[] = [];
constructor() {
super();
this.array = ["1", "2"];
}
render() {
this.refs = [];
return <div jsx>
{this.array.map(el =>
<span ref={this.setRef}>{el}</span>
)}
{/* Can specify Preact attributes on a component */}
<DummyComponent initialInput="1" key="1" ref={this.setRef} />
</div>
}
private setRef = (el: Element) => {
this.refs.push(el);
}
}
// using lifecycles
class ComponentWithLifecycle extends Component<DummyProps, DummyState> {
render() {
return <div>Hi</div>
}
componentWillMount() {
console.log("componentWillMount");
}
componentDidMount() {
console.log("componentDidMount");
}
componentWillUnmount() {
console.log("componentWillUnmount");
}
componentWillReceiveProps(nextProps: DummyProps, nextCtx: any) {
const { initialInput } = nextProps;
console.log("componentWillReceiveProps", initialInput, nextCtx);
}
shouldComponentUpdate(nextProps: DummyProps, nextState: DummyState, nextContext: any) {
return false;
}
componentWillUpdate(nextProps: DummyProps, nextState: DummyState, nextContext: any) {
console.log("componentWillUpdate", nextProps, nextState, nextContext);
}
componentDidUpdate(previousProps: DummyProps, previousState: DummyState, previousContext: any) {
console.log("componentDidUpdate", previousProps, previousState, previousContext);
}
}
// Default props: JSX.LibraryManagedAttributes
class DefaultProps extends Component<{text: string, bool: boolean}> {
static defaultProps = {
text: "hello"
};
render() {
return <div>{this.props.text}</div>;
}
}
const d1 = <DefaultProps bool={false} text="foo" />;
const d2 = <DefaultProps bool={false} />;
class DefaultPropsWithUnion extends Component<
{ default: boolean } & (
| {
type: "string";
str: string;
}
| {
type: "number";
num: number;
})
> {
static defaultProps = {
default: true
};
render() {
return <div />;
}
}
const d3 = <DefaultPropsWithUnion type="string" str={"foo"} />;
const d4 = <DefaultPropsWithUnion type="number" num={0xf00} />;
const d5 = <DefaultPropsWithUnion type="string" str={"foo"} default={false} />;
const d6 = <DefaultPropsWithUnion type="number" num={0xf00} default={false} />;
class DefaultUnion extends Component<
| {
type: "number";
num: number;
}
| {
type: "string";
str: string;
}
> {
static defaultProps = {
type: "number",
num: 1
};
render() {
return <div />;
}
}
const d7 = <DefaultUnion />;
const d8 = <DefaultUnion num={1} />;
const d9 = <DefaultUnion type="number" />;
const d10 = <DefaultUnion type="string" str="foo" />;