89 lines
2.2 KiB
TypeScript
89 lines
2.2 KiB
TypeScript
import {
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BufferDrawing,
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BufferSize,
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CharBuffer,
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Color,
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PaletteMap,
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} from "./base.ts";
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import { Display } from "./display.ts";
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/**
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* Common abstraction for a textual UI
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*/
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export class TextUI {
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private screen = new CharBuffer({ w: 1, h: 1 });
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private palettemap: PaletteMap = [];
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constructor(private display: Display) {
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}
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get drawing(): BufferDrawing {
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return new BufferDrawing(this.screen, this.palettemap);
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}
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/**
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* Initializes the display
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*/
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async init(palette: UIPalette): Promise<void> {
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var size = await this.display.getSize();
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this.screen = new CharBuffer(size);
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this.palettemap = await this.getPaletteMapping(palette);
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await this.display.clear();
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}
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/**
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* Get the current display size
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*/
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getSize(): BufferSize {
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return this.screen.getSize();
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}
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/**
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* Flush the internal buffer to the display
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*/
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async flush(): Promise<void> {
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// TODO only dirty chars
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const { w, h } = this.screen.getSize();
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for (let y = 0; y < h; y++) {
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for (let x = 0; x < w; x++) {
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await this.display.setChar({ x, y }, this.screen.get({ x, y }));
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}
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}
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}
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/**
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* Start the event loop, waiting for input
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*/
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async loop(refresh = 1000): Promise<void> {
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while (true) {
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await this.flush();
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await new Promise((resolve) => setTimeout(resolve, refresh));
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}
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}
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private async getPaletteMapping(
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palette: UIPalette,
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): Promise<PaletteMap> {
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// get the colors supported by display
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const allcolors = palette
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.map((c): Color[] => Array.isArray(c) ? c : [c])
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.reduce((acc, val) => acc.concat(val), []);
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const supported = await this.display.setupPalette(allcolors);
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// TODO find the best color mapping for each source color
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return palette.map((_, idx) => idx);
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}
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}
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/**
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* Color palette requirements.
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*
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* The array represents the "ideal" colors desired by the application.
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* When drawing things, *bg* and *fg* color information should be an index
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* in this palette.
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*
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* For each palette index, a single color can be requested, or an
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* array of accepted alternatives, with decreasing priority.
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*/
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export type UIPalette = ReadonlyArray<Color | ReadonlyArray<Color>>;
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