FadeInOutEditor.ts

// Copyright (c) John Nesky and contributing authors, distributed under the MIT license, see accompanying the LICENSE.md file.

import {Config} from "../synth/SynthConfig.js";
import {ColorConfig} from "./ColorConfig.js";
import {clamp, Instrument, Synth} from "../synth/synth.js";
import {SongDocument} from "./SongDocument.js";
import {HTML, SVG} from "imperative-html/dist/esm/elements-strict.js";
import {EasyPointers} from "./EasyPointers.js";
import {ChangeSequence, UndoableChange} from "./Change.js";
import {ChangeFadeInOut} from "./changes.js";

export class FadeInOutEditor {
	private readonly _editorWidth: number = 120;
	private readonly _editorHeight: number = 26;
	private readonly _fadeCurve: SVGPathElement = SVG.path({fill: ColorConfig.uiWidgetBackground, "pointer-events": "none"});
	private readonly _dottedLinePath: SVGPathElement = SVG.path({fill: "none", stroke: "currentColor", "stroke-width": 1, "stroke-dasharray": "3, 2", "pointer-events": "none"});
	private readonly _controlCurve: SVGPathElement = SVG.path({fill: "none", stroke: "currentColor", "stroke-width": 2, "pointer-events": "none"});
	private readonly _svg: SVGSVGElement = SVG.svg({style: `background-color: ${ColorConfig.editorBackground};`, width: "100%", height: "100%", viewBox: "0 0 "+this._editorWidth+" "+this._editorHeight, preserveAspectRatio: "none"},
		this._fadeCurve,
		this._dottedLinePath,
		this._controlCurve,
	);
	public readonly container: HTMLElement = HTML.div({class: "fadeInOut", style: "height: 100%; touch-action: pan-y; cursor: col-resize;"}, this._svg);
	
	private _mouseX: number = 0;
	private _mouseXStart: number = 0;
	private _mouseDown: boolean = false;
	private _mouseDragging: boolean = false;
	private _draggingFadeIn: boolean = false;
	private _dragChange: UndoableChange | null = null;
	private _renderedFadeIn: number = -1;
	private _renderedFadeOut: number = -1;
	
	constructor(private _doc: SongDocument) {
		const dottedLineX: number = this._fadeOutToX(Config.fadeOutNeutral);
		this._dottedLinePath.setAttribute("d", `M ${dottedLineX} 0 L ${dottedLineX} ${this._editorHeight}`);
		
		new EasyPointers(this.container);
		//this.container.addEventListener("pointerenter", this._onPointerMove);
		//this.container.addEventListener("pointerleave", this._onPointerLeave);
		this.container.addEventListener("pointerdown", this._onPointerDown);
		this.container.addEventListener("pointermove", this._onPointerMove);
		this.container.addEventListener("pointerup", this._onPointerUp);
		this.container.addEventListener("pointercancel", this._onPointerUp);
	}
	
	private _fadeInToX(fadeIn: number) {
		return 1.0 + (this._editorWidth - 2.0) * 0.4 * fadeIn / (Config.fadeInRange - 1);
	}
	private _xToFadeIn(x: number) {
		return clamp(0, Config.fadeInRange, Math.round((x - 1.0) * (Config.fadeInRange - 1) / (0.4 * this._editorWidth - 2.0)));
	}
	private _fadeOutToX(fadeOut: number) {
		return 1.0 + (this._editorWidth - 2.0) * (0.5 + 0.5 * fadeOut / (Config.fadeOutTicks.length - 1));
	}
	private _xToFadeOut(x: number) {
		return clamp(0, Config.fadeOutTicks.length, Math.round((Config.fadeOutTicks.length - 1) * ((x - 1.0) / (this._editorWidth - 2.0) - 0.5) / 0.5));
	}
	
	private _onPointerDown = (event: PointerEvent): void => {
		this._mouseX = event.pointer!.getPointIn(this._svg).x;
		this._mouseXStart = this._mouseX;
		this._mouseDown = true;
		this._mouseDragging = false;
		const instrument: Instrument = this._doc.song.channels[this._doc.channel].instruments[this._doc.getCurrentInstrument()];
		const fadeInX: number = this._fadeInToX(instrument.fadeIn);
		const fadeOutX: number = this._fadeOutToX(instrument.fadeOut);
		this._draggingFadeIn = this._mouseXStart < (fadeInX + fadeOutX) / 2.0;
		this._dragChange = new ChangeSequence();
		this._doc.setProspectiveChange(this._dragChange);
	}
	
	private _onPointerMove = (event: PointerEvent): void => {
		this._mouseX = event.pointer!.getPointIn(this._svg).x;
		if (this._dragChange != null && this._doc.lastChangeWas(this._dragChange)) {
			this._dragChange.undo();
		} else {
			this._mouseDown = false;
		}
		this._dragChange = null;
		
		if (this._mouseDown) {
			const sequence: ChangeSequence = new ChangeSequence();
			this._dragChange = sequence;
			this._doc.setProspectiveChange(this._dragChange);
			
			if (Math.abs(this._mouseX - this._mouseXStart) > 4.0) {
				this._mouseDragging = true;
			}
			
			if (this._mouseDragging) {
				const instrument: Instrument = this._doc.song.channels[this._doc.channel].instruments[this._doc.getCurrentInstrument()];
				if (this._draggingFadeIn) {
					sequence.append(new ChangeFadeInOut(this._doc, this._xToFadeIn(this._fadeInToX(instrument.fadeIn) + this._mouseX - this._mouseXStart), instrument.fadeOut));
				} else {
					sequence.append(new ChangeFadeInOut(this._doc, instrument.fadeIn, this._xToFadeOut(this._fadeOutToX(instrument.fadeOut) + this._mouseX - this._mouseXStart)));
				}
			}
		}
	}
	
	private _onPointerUp = (event: PointerEvent): void => {
		if (this._mouseDown && this._doc.lastChangeWas(this._dragChange) && this._dragChange != null) {
			if (!this._mouseDragging) {
				const instrument: Instrument = this._doc.song.channels[this._doc.channel].instruments[this._doc.getCurrentInstrument()];
				if (this._draggingFadeIn) {
					this._doc.record(new ChangeFadeInOut(this._doc, this._xToFadeIn(this._mouseX), instrument.fadeOut));
				} else {
					this._doc.record(new ChangeFadeInOut(this._doc, instrument.fadeIn, this._xToFadeOut(this._mouseX)));
				}
			} else {
				this._doc.record(this._dragChange);
			}
		}
		this._dragChange = null;
		this._mouseDragging = false;
		this._mouseDown = false;
	}
	
	public render(): void {
		const instrument: Instrument = this._doc.song.channels[this._doc.channel].instruments[this._doc.getCurrentInstrument()];
		
		if (this._renderedFadeIn == instrument.fadeIn && this._renderedFadeOut == instrument.fadeOut) {
			return;
		}
		
		const fadeInX: number = this._fadeInToX(instrument.fadeIn);
		const fadeOutX: number = this._fadeOutToX(instrument.fadeOut);
		this._controlCurve.setAttribute("d", `M ${fadeInX} 0 L ${fadeInX} ${this._editorHeight} M ${fadeOutX} 0 L ${fadeOutX} ${this._editorHeight}`);
		
		const dottedLineX: number = this._fadeOutToX(Config.fadeOutNeutral);
		let fadePath: string = "";
		fadePath += `M 0 ${this._editorHeight} `;
		fadePath += `L ${fadeInX} 0 `;
		if (Synth.fadeOutSettingToTicks(instrument.fadeOut) > 0) {
			fadePath += `L ${dottedLineX} 0 `;
			fadePath += `L ${fadeOutX} ${this._editorHeight} `;
		} else {
			fadePath += `L ${fadeOutX} 0 `;
			fadePath += `L ${dottedLineX} ${this._editorHeight} `;
		}
		fadePath += "z";
		this._fadeCurve.setAttribute("d", fadePath);
	}
}