czh的踩坑筆記 - 微信小程式 - 拖拽操作demo
拖拽功能簡介
一般稱拖拽是滑鼠（手指）單點點擊后執行移動（滑動）操作，程式主動計算滑動區域和位置，頁面及時回應操作的一個功能，重點一 - 需要影片回應及時 重點二 - 需要頁面展示 誰還不知道啊
原始碼自提
https://github.com/czhmisaka/wxDemo_drag.git
原始碼講解
使用了wxs，按照官方解釋，應該能為手機用戶提供更好的性能，（ios端可以有2~20倍提升，安卓端無差異） 控制觸摸穿透，避免組件在操作程序中對外的影響力，這邊用的是catch:touchmove系結中的一個特性，即引數（isMoving）中為空字串時,catch事件會失效， 影片效果模擬用的時 transform，這個主要時為了避免修改dom樹的排序，
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:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}</style>
<style>#mermaid-svg-tPzjWuHYhlK2qYVb {
color: rgba(0, 0, 0, 0.75);
font: ;
}</style>
touchEnd事件回傳移動距離
元素捕捉longtap事件
修改isMoving狀態
touch_move事件轉為可回應狀態
頁面回應影片
記錄觸摸修改距離
回呼函式通知父級頁面提供修改位置的依據
wxs檔案原始碼
var moveY = 0 ,
y = 0 ;
var lock = false
// 開始移動
function touch_start ( e, ownerInstance) {
moveY = e. changedTouches[ 0 ] . clientY
ownerInstance. callMethod ( 'changeMovingStatus' , true )
lock = true
}
// 移動中
function touch_move ( e) {
if ( ! lock) return
y = e. changedTouches[ 0 ] . clientY - moveY
e. instance. setStyle ( {
transform: 'translateY(' + y + 'px)' ,
'z-index' : 100
} )
}
// 移動位置結束
function touch_end ( e, ownerInstance) {
lock = false
e. instance. setStyle ( {
'z-index' : 1
} )
ownerInstance. callMethod ( 'touchEnd' , y)
}
module. exports = {
touch_start: touch_start,
touch_move: touch_move,
touch_end: touch_end
}
