微信小程序实现滑动删除效果

微信小程序实现滑动删除效果

最初打算使用scroll-view实现，效果好、流畅、有惯性滑动，但由于滚动条没法去掉、无法实现上下层的帧布局，最终放弃了。

还是自己写个吧，利用手势事件。遗憾的是小程序中目前没有像android中快速滑动事件，所以，要实现惯性滑动是不可能了。

item的布局：

推荐小程序优先使用flex布局，完全够用。这也是微信推荐的。

{{cardTeam.name}}

-

1

+

¥

99.80

确定

删除

主要是将删除按钮的设为绝对定位(position: absolute)：

.item .remove{

width: 60px;

height: 100%;

background-color: red;

position: absolute;

top: 0;

right: -60px;

display: flex;

justify-content: center;

align-items: center;

}

Page({

data: {

cardTeams:[{"id":"aaaaa", "name":"android教程", "url":"http://see-source.com", "right":0, "startRight":0},{"id":"bbbb", "name":"小程序教程", "url":"http://see-source.com", "right":0, "startRight":0}]

},

drawStart : function(e){

// console.log("drawStarthttp://");

var touch = e.touches[0];

startX = touch.clientX;

startY = touch.clientY;

var cardTeams = this.data.cardTeams;

for(var i in cardTeams){

var data = cardTeams[i];

data.startRight = data.right;

}

key = true;

},

drawEnd : function(e){

console.log("drawEnd");

var cardTeams = this.data.cardTeams;

for(var i in cardTeams){

var data = cardTeams[i];

if(data.right <= 100/2){

data.right = 0;

}else{

data.right = maxRight;

}

}

this.setData({

cardTeams:cardTeams

});

},

drawMove : function(e){

//console.log("drawMove");

var self = this;

var dataId = e.currentTarget.id;

var cardTeams = this.data.cardTeams;

if(key){

var touch = e.touches[0];

endX = touch.clientX;

endY = touch.clientY;

console.log("startX="+startX+" endX="+endX );

if(endX - startX == 0)

return ;

var res = cardTeams;

//从右往左

if((endX - startX) < 0){

for(var k in res){

var data = res[k];

if(res[k].id == dataId){

var startRight = res[k].startRight;

var change = startX - endX;

startRight += change;

if(startRight > maxRight)

startRight = maxRight;

res[k].right = startRight;

}

}

}else{//从左往右

for(var k in res){

var data = res[k];

if(res[k].id == dataId){

var startRight = res[k].startRight;

var change = endX http://- startX;

startRight -= change;

if(startRight < 0)

startRight = 0;

res[k].right = startRight ;

}

}

}

self.setData({

cardTeams:cardTeams

});

}

},

//删除item

delItem: function(e){

var dataId = e.target.dataset.id;

console.log("删除"+dataId);

var cardTeams = this.data.cardTeams;

var newCardTeams = [];

for(var i in cardTeams){

var item = cardTeams[i];

if(item.id != dataId){

newCardTeams.push(item);

}

}

this.setData({

cardTeams:newCardTeams

});

},

onLoad: function () {

console.log('onLoad:'+app.globalData.domain)

}

})

drawStart用于记录手指触碰时的位置，drawMove记录手指滑动的位置，两者的差值就是删除按钮的偏移量

drawEnd手指抬起时触发，用于设置弹回、摊开效果。目前我的是超过一半自动弹开，不足一半自动收回。

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