Method constructor

packages/dockview-core/src/splitview/splitview.ts:226–277

(
        private readonly container: HTMLElement,
        options: SplitViewOptions
    )

    }

    constructor(
        private readonly container: HTMLElement,
        options: SplitViewOptions
    ) {
        this._orientation = options.orientation ?? Orientation.VERTICAL;
        this.element = this.createContainer();

        this.margin = options.margin ?? 0;

        this.proportionalLayout =
            options.proportionalLayout === undefined
                ? true
                : !!options.proportionalLayout;

        this.viewContainer = this.createViewContainer();
        this.sashContainer = this.createSashContainer();

        this.element.appendChild(this.sashContainer);
        this.element.appendChild(this.viewContainer);

        this.container.appendChild(this.element);

        this.style(options.styles);

        // We have an existing set of view, add them now
        if (options.descriptor) {
            this._size = options.descriptor.size;
            options.descriptor.views.forEach((viewDescriptor, index) => {
                const sizing =
                    viewDescriptor.visible === undefined ||
                    viewDescriptor.visible
                        ? viewDescriptor.size
                        : ({
                              type: 'invisible',
                              cachedVisibleSize: viewDescriptor.size,
                          } as InvisibleSizing);

                const view = viewDescriptor.view;
                this.addView(
                    view,
                    sizing,
                    index,
                    true
                    // true skip layout
                );
            });

            // Initialize content size and proportions for first layout
            this._contentSize = this.viewItems.reduce((r, i) => r + i.size, 0);
            this.saveProportions();
        }
    }

    style(styles?: ISplitviewStyles): void {
        if (styles?.separatorBorder === 'transparent') {