Function selectDashProps

dash/dash-renderer/src/wrapper/selectors.ts:84–107

(componentPath: DashLayoutPath)

export const selectDashProps =
    (componentPath: DashLayoutPath) =>
    (state: any): SelectDashProps => {
        const c = getComponentLayout(componentPath, state);
        // Layout hashes records the number of times a path has been updated.
        // sum with the parents hash (match without the last ']') to get the real hash
        // Then it can be easily compared without having to compare the props.
        const strPath = stringifyPath(componentPath);

        let hash;
        if (checkDashChildrenUpdate(c)) {
            hash = determineChangedProps(state, strPath);
        } else {
            hash = state.layoutHashes[strPath];
        }
        let h = 0;
        let changedProps: object = {};
        let renderType = '';
        if (hash) {
            h = hash['hash'];
            changedProps = hash['changedProps'];
            renderType = hash['renderType'];
        }
        return [c, c?.props, h, changedProps, renderType];
    };

export function selectDashPropsEqualityFn(
    [_, __, hash]: SelectDashProps,