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import { Constructor } from "@implab/core-amd/interfaces";
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import { HtmlRendition } from "./tsx/HtmlRendition";
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import { WidgetRendition } from "./tsx/WidgetRendition";
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import { isWidgetConstructor, Rendition } from "./tsx/traits";
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import { FunctionRendition } from "./tsx/FunctionRendition";
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import Stateful = require("dojo/Stateful");
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import _WidgetBase = require("dijit/_WidgetBase");
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import { DjxWidgetBase } from "./tsx/DjxWidgetBase";
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import { WatchRendition } from "./tsx/WatchRendition";
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import { observe } from "./observable";
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export function createElement<T extends Constructor | string | ((props: any) => Element)>(elementType: T, ...args: any[]): Rendition {
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if (typeof elementType === "string") {
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const ctx = new HtmlRendition(elementType);
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if (args)
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args.forEach(x => ctx.visitNext(x));
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return ctx;
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} else if (isWidgetConstructor(elementType)) {
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const ctx = new WidgetRendition(elementType);
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if (args)
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args.forEach(x => ctx.visitNext(x));
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return ctx;
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} else if (typeof elementType === "function") {
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const ctx = new FunctionRendition(elementType as (props: any) => Element);
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if (args)
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args.forEach(x => ctx.visitNext(x));
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return ctx;
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} else {
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throw new Error(`The element type '${elementType}' is unsupported`);
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}
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}
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export interface EventDetails<T = any> {
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detail: T;
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}
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export interface EventSelector {
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selectorTarget: HTMLElement;
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target: HTMLElement;
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}
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export type DojoMouseEvent<T = any> = MouseEvent & EventSelector & EventDetails<T>;
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type StatefulProps<T> = T extends Stateful<infer A> ? A : never;
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/**
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* Observers the property and calls render callback each change.
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*
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* @param target The target object which property will be observed.
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* @param prop The name of the property.
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* @param render The callback which will be called every time the value is changed
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* @returns Rendition which is created instantly
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*/
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export function watch<W extends _WidgetBase, K extends keyof W>(
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target: W,
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prop: K,
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render: (model: W[K]) => any
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): Rendition;
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/**
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* Observers the property and calls render callback each change.
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*
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* @param target The target object which property will be observed.
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* @param prop The name of the property.
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* @param render The callback which will be called every time the value is changed
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* @returns Rendition which is created instantly
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*/
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export function watch<T extends Stateful, K extends keyof StatefulProps<T>>(
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target: T,
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prop: K,
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render: (model: StatefulProps<T>[K]) => any
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): Rendition;
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export function watch<T extends Stateful, K extends keyof StatefulProps<T> & string>(
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target: T,
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prop: K,
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render: (model: StatefulProps<T>[K]) => any
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) {
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return new WatchRendition(
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render,
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observe(({next}) => {
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const h = target.watch(
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prop,
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(_prop, oldValue, newValue) => oldValue !== newValue && next(newValue)
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);
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return () => h.remove();
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})
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)
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}
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/** Decorates the method which will be registered as the handle for the specified event.
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* This decorator can be applied to DjxWidgetBase subclass methods.
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*
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* ```
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* @on("click")
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* _onClick(eventObj: MouseEvent) {
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* // ...
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* }
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* ```
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*/
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export const on = <E extends string>(...eventNames: E[]) =>
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<K extends string,
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T extends DjxWidgetBase<any, { [p in E]: EV }>,
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EV extends Event
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>(
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target: T,
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key: K,
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_descriptor: TypedPropertyDescriptor<(eventObj: EV) => void> | TypedPropertyDescriptor<() => void>
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): any => {
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const handlers = eventNames.map(eventName => ({ eventName, handlerMethod: key }));
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target._eventHandlers = target._eventHandlers ? target._eventHandlers.concat(handlers) : handlers;
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};
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