Class ScoreRenderer

packages/alphatab/src/rendering/ScoreRenderer.ts:24–223

 * @public
 */
export class ScoreRenderer implements IScoreRenderer {
    private _currentLayoutMode: LayoutMode = LayoutMode.Page;
    private _currentRenderEngine: string | null = null;
    private _renderedTracks: Track[] | null = null;

    public canvas: ICanvas | null = null;
    public score: Score | null = null;
    public tracks: Track[] | null = null;
    /**
     * @internal
     */
    public layout: ScoreLayout | null = null;
    public settings: Settings;
    public boundsLookup: BoundsLookup | null = null;
    public width: number = 0;

    /**
     * Initializes a new instance of the {@link ScoreRenderer} class.
     * @param settings The settings to use for rendering.
     */
    public constructor(settings: Settings) {
        this.settings = settings;
        this._recreateCanvas();
        this._recreateLayout();
    }

    public destroy(): void {
        this.score = null;
        this.canvas?.destroy();
        this.canvas = null;
        this.layout = null;
        this.boundsLookup = null;
        this.tracks = null;
    }

    private _recreateCanvas(): boolean {
        if (this._currentRenderEngine !== this.settings.core.engine) {
            this.canvas?.destroy();
            this.canvas = Environment.getRenderEngineFactory(this.settings.core.engine).createCanvas();
            this._currentRenderEngine = this.settings.core.engine;
            return true;
        }
        return false;
    }

    private _recreateLayout(): boolean {
        if (!this.layout || this._currentLayoutMode !== this.settings.display.layoutMode) {
            this.layout = Environment.getLayoutEngineFactory(this.settings.display.layoutMode).createLayout(this);
            this._currentLayoutMode = this.settings.display.layoutMode;
            return true;
        }
        return false;
    }

    public renderScore(score: Score | null, trackIndexes: number[] | null, renderHints?: RenderHints): void {
        try {
            this.score = score;
            let tracks: Track[] | null = null;