Function setLabelLineStyle

src/label/labelGuideHelper.ts:589–662

(
    targetEl: Element,
    statesModels: Record<DisplayState, LabelLineModel>,
    defaultStyle?: Polyline['style']
)

 * Create a label line if necessary and set it's style.
 */
export function setLabelLineStyle(
    targetEl: Element,
    statesModels: Record<DisplayState, LabelLineModel>,
    defaultStyle?: Polyline['style']
) {
    let labelLine = targetEl.getTextGuideLine();
    const label = targetEl.getTextContent();
    if (!label) {
        // Not show label line if there is no label.
        if (labelLine) {
            targetEl.removeTextGuideLine();
        }
        return;
    }

    const normalModel = statesModels.normal;
    const showNormal = normalModel.get('show');
    const labelIgnoreNormal = label.ignore;

    for (let i = 0; i < DISPLAY_STATES.length; i++) {
        const stateName = DISPLAY_STATES[i];
        const stateModel = statesModels[stateName];
        const isNormal = stateName === 'normal';
        if (stateModel) {
            const stateShow = stateModel.get('show');
            const isLabelIgnored = isNormal
                ? labelIgnoreNormal
                : retrieve2(label.states[stateName] && label.states[stateName].ignore, labelIgnoreNormal);
            if (isLabelIgnored  // Not show when label is not shown in this state.
                || !retrieve2(stateShow, showNormal) // Use normal state by default if not set.
            ) {
                const stateObj = isNormal ? labelLine : (labelLine && labelLine.states[stateName]);
                if (stateObj) {
                    stateObj.ignore = true;
                }
                if (!!labelLine) {
                    setLabelLineState(labelLine, true, stateName, stateModel);
                }
                continue;
            }
            // Create labelLine if not exists
            if (!labelLine) {
                labelLine = new Polyline();
                targetEl.setTextGuideLine(labelLine);
                // Reset state of normal because it's new created.
                // NOTE: NORMAL should always been the first!
                if (!isNormal && (labelIgnoreNormal || !showNormal)) {
                    setLabelLineState(labelLine, true, 'normal', statesModels.normal);
                }

                // Use same state proxy.
                if (targetEl.stateProxy) {
                    labelLine.stateProxy = targetEl.stateProxy;
                }
            }

            setLabelLineState(labelLine, false, stateName, stateModel);
        }