微信小程序-类似探探的卡片拖拽切换

比眉伴天荒 2022-12-28 11:27 234阅读 0赞

# 效果 #

用户可以通过拖拽卡片，来将其移除。除此之外还添加了大量的交互式动画。

效果图

# 实现 #

为了提升运行速度，采用了只生成两张卡片，并将其不断复用的方法。

当用户点击卡片式，记录此次的点击位置，并将这张卡片变小，产生按压的效果。

viewTouchInside: function (event) {
    
        var that = this
    
        var pointX = event.touches[0].clientX
        var pointY = event.touches[0].clientY
    
        that.setData({
          startX: pointX,
          startY: pointY
        })
    
        var animation = wx.createAnimation({
          duration: 100,
          timingFunction: 'ease-out',
        })
        animation.scale(0.9).step()
    
        if (that.data.isFirstCard == true) {
          that.setData({
            animation1: animation.export()
          })
        } else {
          that.setData({
            animation2: animation.export()
          })
        }
      }

当用户拖拽卡片时，卡片会随着手指移动，并旋转。下方的卡片也会逐渐从透明度为0的状态显现出来。

viewDidMove: function (event) {
        
        var that = this
    
        var pointX = event.touches[0].clientX
        var pointY = event.touches[0].clientY
    
        var widthCenter = that.data.windowWidth / 2
        var heightCenter = that.data.windowHeight / 2
    
        var perX = (pointX - that.data.startX) / widthCenter
        var perY = (pointY - that.data.startY) / heightCenter
        var maxPer = (Math.abs(perX) > Math.abs(perY)) ? Math.abs(perX) : Math.abs(perY)
    
    
        var animationOpacity = wx.createAnimation({
          duration: 100,
          timingFunction: 'ease-out',
        })
        animationOpacity.opacity(maxPer).step()
    
        var animationRotate = wx.createAnimation({
          duration: 100,
          timingFunction: 'ease-out',
        })
        animationRotate.scale(0.9).rotate(perX * 20).step()
    
        var x = marginHori + pointX - that.data.startX
        var y = marginVerti + pointY - that.data.startY
    
        if (that.data.isFirstCard == true) {
          that.setData({
            left1: x,
            top1: y
          })
          that.setData({
            animation1: animationRotate.export(),
            animation2: animationOpacity.export()
          })
        } else {
          that.setData({
            left2: x,
            top2: y
          })
          that.setData({
            animation1: animationOpacity.export(),
            animation2: animationRotate.export(),
          })
        }
      }

当用户手指离开卡片时，判断是否要进行移除卡片操作。如果需要，则根据卡片的方位移除该卡片，否则将卡片回归原位。

viewTouchUpDownInside: function (event) {
    
        var that = this
    
        var endX = event.changedTouches[0].clientX
        var endY = event.changedTouches[0].clientY
    
        var distanceX = endX - that.data.startX
        var distanceY = endY - that.data.startY
    
        if (distanceX > 93.75) {
          that.removeCard('right')
        } else if (distanceX < -93.75) {
          that.removeCard('left')
        } else if (distanceY < -100) {
          that.removeCard('up')
        } else if (distanceY > 100) {
          that.removeCard('down')
        }
    
        if (distanceX < 93.75 && distanceX > -93.75 && distanceY > -150 && distanceY < 150) {
          if (that.data.isFirstCard == true) {
            that.setData({
              top1: marginVerti,
              left1: marginHori
            })
          } else {
            that.setData({
              top2: marginVerti,
              left2: marginHori
            })
          }
        }
    
        var animation = wx.createAnimation({
          duration: 100,
          timingFunction: 'ease-out',
        })
        animation.scale(1).step()
    
        if (that.data.isFirstCard == true) {
          that.setData({
            animation1: animation.export()
          })
        } else {
          that.setData({
            animation2: animation.export()
          })
        }
    
        if (that.data.data.length - that.data.count < 5) {
          that.requestMenu()
        }
      }

以下是移除卡片操作，首先先将卡片移除屏幕，随后再将数据重新填充，回归原位，实现复用机制。

removeCard: function (direction) {
    
        var that = this
    
        var animation = wx.createAnimation({
          duration: 250,
          timingFunction: 'linear',
        })
    
        if (direction == 'right') {
          animation.translateX(400).rotate(45).opacity(0).step()
          animation.translateX(0).rotate(0).step()
        } else if (direction == 'left') {
          animation.translateX(-400).rotate(-45).opacity(0).step()
          animation.translateX(0).rotate(0).step()
        } else if (direction == 'up') {
          animation.translateY(-400).opacity(0).step()
          animation.translateY(0).step()
        } else if (direction == 'down') {
          animation.translateY(400).opacity(0).step()
          animation.translateY(0).step()
        }
        
        if (that.data.isFirstCard == true) {
          that.setData({
            animation1: animation.export(),
            count1: that.data.count1 + 2,
            count: that.data.count + 1,
            name1: that.data.data[that.data.count1 + 2]["name"],
            isLike1: that.data.data[that.data.count1 + 2]["is_like"],
            location1: that.data.data[that.data.count1 + 2]["location"],
            isFirstCard: false
          })
    
          setTimeout(function () {
            that.setData({
              top1: marginVerti,
              left1: marginHori
            })
          }.bind(that), 250)
        } else {
          that.setData({
            animation2: animation.export(),
            count2: that.data.count2 + 2,
            count: that.data.count + 1,
            name2: that.data.data[that.data.count2 + 2]["name"],
            isLike2: that.data.data[that.data.count2 + 2]["is_like"],
            location2: that.data.data[that.data.count2 + 2]["location"],
            isFirstCard: true
          })
    
          setTimeout(function () {
            that.setData({
              top2: marginVerti,
              left2: marginHori
            })
          }.bind(that), 100)
    
          that.setImgURL()
        }
      },

# 源码 #

*  [Github][]

## 作者 ##

*  [zxYin-Github][]
 *  [伽马星人-简书][-]

[Github]: https://links.jianshu.com/go?to=%255Bhttps%3A%2F%2Fgithub.com%2FzxYin%2FWechat-DraggedCard%255D%28https%3A%2F%2Fgithub.com%2FzxYin%2FWechat-DraggedCard%29
[zxYin-Github]: https://links.jianshu.com/go?to=https%3A%2F%2Fgithub.com%2FzxYin
[-]: https://www.jianshu.com/u/5a0751f83b30