private _layout()

in src/component/timeline/SliderTimelineView.ts [168:266]
83 lines of code
30 McCabe index (conditional complexity)

    private _layout(timelineModel: SliderTimelineModel, api: ExtensionAPI): LayoutInfo {
        const labelPosOpt = timelineModel.get(['label', 'position']);
        const orient = timelineModel.get('orient');
        const viewRect = getViewRect(timelineModel, api);
        let parsedLabelPos: number | '+' | '-';
        // Auto label offset.
        if (labelPosOpt == null || labelPosOpt === 'auto') {
            parsedLabelPos = orient === 'horizontal'
                ? ((viewRect.y + viewRect.height / 2) < api.getHeight() / 2 ? '-' : '+')
                : ((viewRect.x + viewRect.width / 2) < api.getWidth() / 2 ? '+' : '-');
        }
        else if (isString(labelPosOpt)) {
            parsedLabelPos = ({
                horizontal: {top: '-', bottom: '+'},
                vertical: {left: '-', right: '+'}
            } as const)[orient][labelPosOpt];
        }
        else {
            // is number
            parsedLabelPos = labelPosOpt;
        }

        const labelAlignMap = {
            horizontal: 'center',
            vertical: (parsedLabelPos >= 0 || parsedLabelPos === '+') ? 'left' : 'right'
        };

        const labelBaselineMap = {
            horizontal: (parsedLabelPos >= 0 || parsedLabelPos === '+') ? 'top' : 'bottom',
            vertical: 'middle'
        };
        const rotationMap = {
            horizontal: 0,
            vertical: PI / 2
        };

        // Position
        const mainLength = orient === 'vertical' ? viewRect.height : viewRect.width;

        const controlModel = timelineModel.getModel('controlStyle');
        const showControl = controlModel.get('show', true);
        const controlSize = showControl ? controlModel.get('itemSize') : 0;
        const controlGap = showControl ? controlModel.get('itemGap') : 0;
        const sizePlusGap = controlSize + controlGap;

        // Special label rotate.
        let labelRotation = timelineModel.get(['label', 'rotate']) || 0;
        labelRotation = labelRotation * PI / 180; // To radian.

        let playPosition: number[];
        let prevBtnPosition: number[];
        let nextBtnPosition: number[];
        const controlPosition = controlModel.get('position', true);
        const showPlayBtn = showControl && controlModel.get('showPlayBtn', true);
        const showPrevBtn = showControl && controlModel.get('showPrevBtn', true);
        const showNextBtn = showControl && controlModel.get('showNextBtn', true);
        let xLeft = 0;
        let xRight = mainLength;

        // position[0] means left, position[1] means middle.
        if (controlPosition === 'left' || controlPosition === 'bottom') {
            showPlayBtn && (playPosition = [0, 0], xLeft += sizePlusGap);
            showPrevBtn && (prevBtnPosition = [xLeft, 0], xLeft += sizePlusGap);
            showNextBtn && (nextBtnPosition = [xRight - controlSize, 0], xRight -= sizePlusGap);
        }
        else { // 'top' 'right'
            showPlayBtn && (playPosition = [xRight - controlSize, 0], xRight -= sizePlusGap);
            showPrevBtn && (prevBtnPosition = [0, 0], xLeft += sizePlusGap);
            showNextBtn && (nextBtnPosition = [xRight - controlSize, 0], xRight -= sizePlusGap);
        }
        const axisExtent = [xLeft, xRight];

        if (timelineModel.get('inverse')) {
            axisExtent.reverse();
        }

        return {
            viewRect: viewRect,
            mainLength: mainLength,
            orient: orient,

            rotation: rotationMap[orient],
            labelRotation: labelRotation,
            labelPosOpt: parsedLabelPos,
            labelAlign: timelineModel.get(['label', 'align']) || labelAlignMap[orient] as ZRTextAlign,
            labelBaseline: timelineModel.get(['label', 'verticalAlign'])
                || timelineModel.get(['label', 'baseline'])
                || labelBaselineMap[orient] as ZRTextVerticalAlign,

            // Based on mainGroup.
            playPosition: playPosition,
            prevBtnPosition: prevBtnPosition,
            nextBtnPosition: nextBtnPosition,
            axisExtent: axisExtent,

            controlSize: controlSize,
            controlGap: controlGap
        };
    }