腾挪手机APP滑动手指切换图片特效_.NET相关

移动手机APP滑动手指切换图片特效

这是一款效果非常炫酷的移动手机APP滑动手指切换图片特效。该APP特效在移动手机中用户可以通过手指的左右滑动来切换图片，在桌面设备中通过鼠标也可达到同样的效果。

使用方法

HTML结构

这个移动手机APP切换图片特效的HTML结构采用嵌套<div>的HTML结构，每一张图片卡片都包裹在div.demo__card中，里面放置了图片，描述信息和一些额外的图层。

<div class="demo__card">
  <div class="demo__card__top brown">
    <div class="demo__card__img"></div>
    <p class="demo__card__name">Hungry cat</p>
  </div>
  <div class="demo__card__btm">
    <p class="demo__card__we">Whatever</p>
  </div>
  <div class="demo__card__choice m--reject"></div>
  <div class="demo__card__choice m--like"></div>
  <div class="demo__card__drag"></div>
</div>              

m--reject是向左移动图片时的图层，m--like是向右移动图片时的图层，demo__card__drag是拖动层。

JavaScript

在jQuery代码中，pullChange()函数用于设置向左和向右两个滑动层的旋转角度和透明度。release()函数用于判断用户是向左还是向右滑动手指，并为这些动作在DOM元素上添加相应的class。

function pullChange() {
    animating = true;
    deg = pullDeltaX / 10;
    $card.css('transform', 'translateX(' + pullDeltaX + 'px) rotate(' + deg + 'deg)');
    var opacity = pullDeltaX / 100;
    var rejectOpacity = opacity >= 0 ? 0 : Math.abs(opacity);
    var likeOpacity = opacity <= 0 ? 0 : opacity;
    $cardReject.css('opacity', rejectOpacity);
    $cardLike.css('opacity', likeOpacity);
}
;
function release() {
    if (pullDeltaX >= decisionVal) {
        $card.addClass('to-right');
    } else if (pullDeltaX <= -decisionVal) {
        $card.addClass('to-left');
    }
    if (Math.abs(pullDeltaX) >= decisionVal) {
        $card.addClass('inactive');
        setTimeout(function () {
            $card.addClass('below').removeClass('inactive to-left to-right');
            cardsCounter++;
            if (cardsCounter === numOfCards) {
                cardsCounter = 0;
                $('.demo__card').removeClass('below');
            }
        }, 300);
    }
    if (Math.abs(pullDeltaX) < decisionVal) {
        $card.addClass('reset');
    }
    setTimeout(function () {
        $card.attr('style', '').removeClass('reset').find('.demo__card__choice').attr('style', '');
        pullDeltaX = 0;
        animating = false;
    }, 300);
};                  

最后监听mousedown和touchstart事件，并对非.inactive的卡片元素执行卡片切换操作。

$(document).on('mousedown touchstart', '.demo__card:not(.inactive)', function (e) {
    if (animating)
        return;
    $card = $(this);
    $cardReject = $('.demo__card__choice.m--reject', $card);
    $cardLike = $('.demo__card__choice.m--like', $card);
    var startX = e.pageX || e.originalEvent.touches[0].pageX;
    $(document).on('mousemove touchmove', function (e) {
        var x = e.pageX || e.originalEvent.touches[0].pageX;
        pullDeltaX = x - startX;
        if (!pullDeltaX)
            return;
        pullChange();
    });
    $(document).on('mouseup touchend', function () {
        $(document).off('mousemove touchmove mouseup touchend');
        if (!pullDeltaX)
            return;
        release();
    });
});                  