(function($) {
var old = $.fn.drag;
function Drag(element, options) {
this.ver = '1.0';
this.$element = $(element);
this.options = $.extend({}, $.fn.drag.defaults, options);
this.init();
}
Drag.prototype = {
constructor: Drag,
init: function() {
var options = this.options;
var ifDrag;
this.$element.on('touchstart.drag.founder mousedown.drag.founder', function(e) {
ifDrag=true;
var ev = e.type == 'touchstart' ? e.originalEvent.touches[0] : e,
startPos = $(this).position(),
disX = ev.pageX - startPos.left,
disY = ev.pageY - startPos.top,
that = this;
//记录初始位置,以便复位使用
$(this).data('startPos', startPos);
if (options.before && $.isFunction(options.before)) {
options.before.call(that, ev);
}
$(document).on('touchmove.drag.founder mousemove.drag.founder', function(e) {
e.preventDefault();
var ev = e.type == 'touchmove' ? e.originalEvent.touches[0] : e,
$this = $(that),
$parent = $this.offsetParent(),
$parent=$parent.is(':root')?$(window):$parent,
pPos = $parent.offset(),
pPos=pPos?pPos:{left:0,top:0},
left = ev.pageX - disX - pPos.left,
top = ev.pageY - disY - pPos.top,
r = $parent.width() - $this.outerWidth(true),
d = $parent.height() - $this.outerHeight(true);
left = left < 0 ? 0 : left > r ? r : left;
top = top < 0 ? 0 : top > d ? d : top;
$(that).css({
left: left + 'px',
top: top + 'px'
});
if (options.process && $.isFunction(options.process)) {
options.process.call(that, ev);
}
e.preventDefault();
});
$(document).on('touchend.drag.founder mouseup.drag.founder',
function(e) {
/* if(isDrag){
$(this).css({"top": "calc(50% - 60px)","left":"calc(50% - 60px)"});
}*/
e.preventDefault();
var ev = e.type == 'touchend' ? e.originalEvent.changedTouches[0] : e;
if (options.end && $.isFunction(options.end)) {
options.end.call(that, ev);
}
$(document).off('.drag.founder');
}
);
e.preventDefault();
});
}
};
//jQ插件模式
$.fn.drag = function(options) {
return this.each(function() {
var $this = $(this),
instance = $this.data('drag');
if (!instance) {
instance = new Drag(this, options);
$this.data('drag', instance);
} else {
instance.init();
}
if (typeof options === 'string') {
//instance.options[options].call(this);
}
});
};
$.fn.drag.defaults = {
before: $.noop,
process: $.noop,
end: $.noop
};
$.fn.drag.noConflict = function() {
$.fn.drag = old;
return this;
};
})(jQuery); // JavaScript Document |
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