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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| "use strict" | ||
|
|
||
| // 控制 dom 元素的拖动 | ||
| // dataset 包含设备的宽高和控制的 dom 的宽高 | ||
| var handleTouchMove = function(e) { | ||
| var left = e.touches[0].pageX; | ||
| var top = e.touches[0].pageY; | ||
| var obj = e.instance.getState(); | ||
| // 使用单例对象，减少逻辑层和视图层之间的通信 | ||
| if(!obj.windowHeightSubHalfHeight || !obj.windowWidthSubHalfWidth) { | ||
| if(!obj.windowHeight || !obj.windowWidth || !obj.height || !obj.width) { | ||
| var dom = e.instance.getDataset(); | ||
| obj.windowHeight = dom.windowHeight; | ||
| obj.windowWidth = dom.windowWidth; | ||
| obj.height = dom.height; | ||
| obj.width = dom.width; | ||
| } | ||
| obj.windowHeightSubHalfHeight = obj.windowHeight - obj.height / 2; | ||
| obj.windowWidthSubHalfWidth = obj.windowWidth - obj.width / 2; | ||
| } | ||
| e.instance.setStyle({ | ||
| 'right': obj.windowWidthSubHalfWidth - left + 'px', | ||
| 'bottom': obj.windowHeightSubHalfHeight - top + 'px' | ||
| }) | ||
| return false; | ||
| } | ||
|
|
||
| // 执行 dom 元素拖拽前做的事情 | ||
| var handleTouchStart = function(e) { | ||
| // | ||
| } | ||
|
|
||
| // 执行 dom 元素拖拽之后的事情 | ||
| var handleTouchEnd = function(e) { | ||
| // dom 元素拖拽结束后，将 dom 元素在一定时间内移至最短的安全区域内 | ||
| // 这里默认是屏幕右侧，且 top 和 bottom 不低于 100px， left 或 right 为 50px | ||
| var domStyle = e.instance.getBoundingClientRect(), obj = e.instance.getState(); | ||
| var left = domStyle.left, top = domStyle.top; | ||
| var leftAdd, topAdd, leftRes, topRes; | ||
| if(left > (obj.windowWidth - obj.width) / 2) { | ||
| leftRes = obj.windowWidth - 50 - obj.width; | ||
| if(left > obj.windowWidth - obj.width - 50) | ||
| leftAdd = -8; | ||
| else leftAdd = 8; | ||
| } | ||
| else { | ||
| leftRes = 50; | ||
| if(left < 50) | ||
| leftAdd = 8; | ||
| else leftAdd = -8; | ||
| } | ||
| if(top > obj.windowHeight - obj.height - 100) { | ||
| topRes = obj.windowHeight - 100 - obj.height; | ||
| topAdd = -8; | ||
| } | ||
| else if(top < 100) { | ||
| topRes = 100; | ||
| topAdd = 8; | ||
| } | ||
| else topRes = top; | ||
| var flag = false; | ||
| var render = function() { | ||
| if((leftAdd > 0 && left < leftRes) || (leftAdd < 0 && left > leftRes)) { | ||
| left += leftAdd; | ||
| flag = true; | ||
| } | ||
| if((topAdd > 0 && top < topRes) || (topAdd < 0 && top > topRes)) { | ||
| top += topAdd; | ||
| flag = true; | ||
| } | ||
| if(flag) { | ||
| e.instance.setStyle({ | ||
| left: left + 'px', | ||
| top: top + 'px' | ||
| }) | ||
| flag = false; | ||
| e.instance.requestAnimationFrame(render); | ||
| } | ||
| } | ||
| e.instance.requestAnimationFrame(render); | ||
| } | ||
|
|
||
| module.exports = { | ||
| handleTouchMove: handleTouchMove, | ||
| handleTouchStart: handleTouchStart, | ||
| handleTouchEnd: handleTouchEnd | ||
| } |
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