@faceless-ui/slider/dist/SliderProvider/reducer.js

A React library for building every kind of slider

export const reducer = (state, action) => {
    const newState = Object.assign({}, state);
    const { currentSlideIndex, selectedSlideIndex, slides, } = state;
    const { type, payload, } = action;
    switch (type) {
        case 'UPDATE_SLIDE': {
            const { slide, } = payload;
            if (slide) {
                const { index: slideIndex, } = slide;
                newState.slides[slideIndex] = slide;
            }
            break;
        }
        case 'GO_TO_SLIDE_INDEX': {
            const { index, } = payload;
            if (typeof index === 'number') {
                newState.scrollIndex = index;
            }
            break;
        }
        case 'GO_TO_NEXT_SLIDE': {
            const { loop, isFullyScrolled } = payload;
            const currentIndex = selectedSlideIndex || currentSlideIndex;
            const nextIndex = currentIndex + 1;
            const hasNext = nextIndex < slides.length;
            let indexToUse = nextIndex;
            if (!hasNext || isFullyScrolled) {
                if (loop)
                    indexToUse = 0; // first slide
                else
                    indexToUse = slides.length - 1; // last slide
            }
            newState.scrollIndex = indexToUse;
            break;
        }
        case 'GO_TO_PREV_SLIDE': {
            const { loop, } = payload;
            const currentIndex = selectedSlideIndex || currentSlideIndex;
            const prevIndex = currentIndex - 1;
            const hasPrev = prevIndex >= 0;
            let indexToUse = prevIndex;
            if (!hasPrev) {
                if (loop)
                    indexToUse = slides.length - 1;
                else
                    indexToUse = 0;
            }
            newState.scrollIndex = indexToUse;
            break;
        }
        default: {
            break;
        }
    }
    const allIntersections = state === null || state === void 0 ? void 0 : state.slides.map(({ isIntersecting }) => isIntersecting);
    let newSlideIndex = allIntersections.indexOf(true); // first intersecting slide
    if (newSlideIndex === -1)
        newSlideIndex = 0; // if none intersection, use first slide
    newState.currentSlideIndex = newSlideIndex;
    return newState;
};
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