71 lines
1.8 KiB
JavaScript
71 lines
1.8 KiB
JavaScript
$.drug = null;
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$.dragstart = function(e)
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{
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this.dragElement.deltaX = e.clientX - this.dragElement.offsetLeft;
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this.dragElement.deltaY = e.clientY - this.dragElement.offsetTop;
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// Save CSS
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this.dragElement.oldPos = $.css(this.dragElement, 'position');
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this.dragElement.oldCursor = $.css(this.dragElement, 'cursor');
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this.dragElement.oldUserSelect = $.css(this.dragElement, 'user-select');
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$(this.dragElement).css('position', 'absolute')
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.css('cursor', 'move')
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.css('user-select', 'none');
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$.drug = this.dragElement;
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};
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$.dragstop = function(e)
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{
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$.drug = null;
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// Restore CSS
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$(this).css('cursor', this.oldCursor)
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.css('user-select', this.oldUserSelect);
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}
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$.drag = function(e)
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{
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if ($.drug == null) {
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return;
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}
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// Update position
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var nx = (e.clientX - $.drug.deltaX);
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var ny = (e.clientY - $.drug.deltaY);
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// Bounds check
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// Left edge
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nx = (nx < 0) ? 0 : nx;
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// right edge
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nx = (nx + $.drug.offsetWidth) > document.width ? document.width - $.drug.offsetWidth : nx;
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// Top
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ny = (ny < window.scrollY) ? window.scrollY : ny;
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// Bottom
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ny = (ny + $.drug.offsetHeight) > window.innerHeight + window.scrollY ? window.innerHeight + window.scrollY - $.drug.offsetHeight: ny;
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$($.drug).css('left', nx + 'px')
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.css('top', ny + 'px');
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};
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$.draginit = false;
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$.fn.Draggable = function(handle)
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{
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// Don't add > 1 of these handlers
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if (!$.draginit) {
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$(document).bind('mousemove', $.drag);
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}
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return this.each(function()
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{
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var dhe = handle ? $(this).find(handle) : $(this);
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dhe.get(0).dragElement = this;
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dhe.bind('mousedown', $.dragstart)
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.bind('mouseup', $.dragstop);
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});
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};
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