手机端触屏手指滑动方向及拖动层
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | <! DOCTYPE HTML> < html > < head > < meta charset="utf-8"> < title >手机端触屏手指滑动方向及拖动层</ title > < meta content="width=device-width,initial-scale=1.0,minimum-scale=1.0,user-scalable=no,maximum-scale=1.0" id="viewport" name="viewport"> < script type="text/javascript"> var touch_screen = { //方向 direction: { _clientX: 0, _clientY: 0, _moveX: 0, _moveY: 0, _startX: 0, _startY: 0, _object: null, _direction: "no", _controller: true, //开始滑动、拖动 start: function() { var self = this, obj = self._object; obj.addEventListener('touchstart', function(e) { self._startX = e.touches[0].pageX; self._startY = e.touches[0].pageY; self._clientX = e.touches[0].clientX - parseInt(this.offsetLeft); self._clientY = e.touches[0].clientY - parseInt(this.offsetTop); self.move(); }, false); obj.addEventListener('touchend', function(e) { self._controller = true; }, false); }, //拖动滑动时 move: function() { var self = this; self._object.addEventListener('touchmove', function(e) { if(self._controller) { var endX, endY; endX = e.changedTouches[0].pageX; endY = e.changedTouches[0].pageY; var direction = self.get_slide_direction(self._startX, self._startY, endX, endY); switch(direction) { case 0: self._direction = "no"; break; case 1: self._direction = "right"; break; case 2: self._direction = "left"; break; case 3: self._direction = "down"; break; case 4: self._direction = "up"; break; default: } self._controller = false; } e.preventDefault(); self._moveX = e.touches[0].clientX - self._clientX; self._moveY = e.touches[0].clientY - self._clientY; this.style.left = self._moveX + 'px'; this.style.top = self._moveY + 'px'; this.innerHTML = self._moveX + "|" + self._moveY + "|" + self._direction }, false); }, //计算滑动角度 get_slide_angle: function(a, b) { return Math.atan2(a, b) * 180 / Math.PI; }, //根据角度给出方向 get_slide_direction: function(a, b, c, d) { var dy = b - d; var dx = c - a; var result = 0; if(Math.abs(dx) < 2 && Math.abs(dy) < 2) { return result } var angle = this.get_slide_angle(dx, dy); if(angle >= -45 && angle < 45 ) { result = 4; } else if(angle >= 45 && angle < 135 ) { result = 1; } else if(angle >= -135 && angle < -45) { result = 2; } else if((angle >= 135 && angle <= 180) || (angle >= -180 && angle < -135)) { result = 3; } return result; }, //通过一个dom对象进行初始化 init: function(a) { var class_clone = function(source) { var result = {}; for(var key in source) { result[key] = typeof source[key] === "object" ? class_clone(source[key]) : source[key]; } return result; } var self = class_clone(touch_screen.direction); self._object = document.getElementById(a); if(!self._object) { alert('bind_object is not an object'); return false; } self.start(); } } } //页面加载完成 window.onload = function() { touch_screen.direction.init("test_div"); touch_screen.direction.init("test_div2"); } </ script > < style type="text/css"> #test_div, #test_div2 { width: 100px; height: 100px; line-height: 100px; text-align: center; background: #999; position: absolute; left: 0; top: 0; } </ style > </ head > < body > < div id="test_div"></ div > < div id="test_div2"></ div > </ body > </ html > |
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