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81 lines
1.6 KiB
81 lines
1.6 KiB
5 years ago
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(function($){
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var O = 'opacity',
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C = 'CursorMove',
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M = 'mousemove.drag',
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U = 'mouseup.drag',
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D = 'mousedown.drag',
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W = $(window),
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A = $(document),
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timer = null,
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E = function () {
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this.w.css(O, 1);
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A.unbind(M+' '+U);
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},
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G = function (e) {
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var m = this,
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p = m.w.offset(),
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t = p.top,
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l = p.left,
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r = W.width() - m.w.outerWidth(),
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b = W.height() - m.w.outerHeight(),
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X = e.pageX,
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Y = e.pageY,
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x = m.p.left + (X - m.x) - W.scrollLeft(),
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y = m.p.top + (Y - m.y) - W.scrollTop();
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//以下逻辑保证在可视范围内移动
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if (l <= 0 && X < m.x)
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{
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x = 0;
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m.x = Math.max(X, 0);
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m.p.left = 0;
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}
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if (t <= 0 && Y < m.y)
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{
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y = 0;
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m.y = Math.max(Y, 0);
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m.p.top = 0;
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}
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if (r <= l - A.scrollLeft() && X > m.x)
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{
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x = r;
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m.x = Math.min(X, r);
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m.p.left = r;
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}
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if (b <= t - A.scrollLeft() && Y > m.y)
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{
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y = b;
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m.y = Math.min(Y, b);
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m.p.top = b;
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}
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m.w.css({ left : x, top : y });
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return false;
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},
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S = function (e, m) {
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e.preventDefault();
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m = this;
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m.w.css(O, 0.8);
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m.p = m.w.offset();
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m.x = e.pageX;
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m.y = e.pageY;
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A.bind(M, $.proxy(G, m)).bind(U, $.proxy(E, m));
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};
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$.fn.Drag = function(o){
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return this.each(function () {
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var e = $(this),
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x = function () {
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this.h = o ? (typeof o === 'string' ? $(o, e[0]) : o) : e;
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this.w = e;
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return this;
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},
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X = new x();
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e.data('__h', X.h);
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X.h.addClass(C).unbind(D).bind(D, $.proxy(S, X));
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});
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};
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$.fn.unDrag = function () {
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return this.each(function(){
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($(this).data('__h') || $()).removeClass(C).unbind(D);
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});
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};
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})($);
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