{{{
(function($) {
$.fn.dragsort = function(options) {
if (options == "destroy") {
$(this.selector).trigger("dragsort-uninit");
return;
}
var opts = $.extend({}, $.fn.dragsort.defaults, options);
var lists = [];
var list = null, lastPos = null;
this.each(function(i, cont) {
//if list container is table, the browser automatically wraps rows in tbody if not specified so change list container to tbody so that children returns rows as user expected
if ($(cont).is("table") && $(cont).children().size() == 1 && $(cont).children().is("tbody"))
cont = $(cont).children().get(0);
var newList = {
draggedItem: null,
placeHolderItem: null,
pos: null,
offset: null,
offsetLimit: null,
scroll: null,
container: cont,
init: function() {
//set options to default values if not set
var tagName = $(this.container).children().size() == 0 ? "li" : $(this.container).children(":first").get(0).tagName.toLowerCase();
if (opts.itemSelector == "")
opts.itemSelector = tagName;
if (opts.dragSelector == "")
opts.dragSelector = tagName;
if (opts.placeHolderTemplate == "")
opts.placeHolderTemplate = "<" + tagName + "> </" + tagName + ">";
//listidx allows reference back to correct list variable instance
$(this.container).attr("data-listidx", i).mousedown(this.grabItem).bind("dragsort-uninit", this.uninit);
this.styleDragHandlers(true);
},
uninit: function() {
var list = lists[$(this).attr("data-listidx")];
$(list.container).unbind("mousedown", list.grabItem).unbind("dragsort-uninit");
list.styleDragHandlers(false);
},
getItems: function() {
return $(this.container).children(opts.itemSelector);
},
styleDragHandlers: function(cursor) {
this.getItems().map(function() { return $(this).is(opts.dragSelector) ? this : $(this).find(opts.dragSelector).get(); }).css("cursor", cursor ? "pointer" : "");
},
grabItem: function(e) {
//if not left click or if clicked on excluded element (e.g. text box) or not a moveable list item return
if (e.which != 1 || $(e.target).is(opts.dragSelectorExclude) || $(e.target).closest(opts.dragSelectorExclude).size() > 0 || $(e.target).closest(opts.itemSelector).size() == 0)
return;
//prevents selection, stops issue on Fx where dragging hyperlink doesn't work and on IE where it triggers mousemove even though mouse hasn't moved,
//does also stop being able to click text boxes hence dragging on text boxes by default is disabled in dragSelectorExclude
e.preventDefault();
//change cursor to move while dragging
var dragHandle = e.target;
while (!$(dragHandle).is(opts.dragSelector)) {
if (dragHandle == this) return;
dragHandle = dragHandle.parentNode;
}
$(dragHandle).attr("data-cursor", $(dragHandle).css("cursor"));
$(dragHandle).css("cursor", "move");
//on mousedown wait for movement of mouse before triggering dragsort script (dragStart) to allow clicking of hyperlinks to work
var list = lists[$(this).attr("data-listidx")];
var item = this;
var trigger = function() {
list.dragStart.call(item, e);
$(list.container).unbind("mousemove", trigger);
};
$(list.container).mousemove(trigger).mouseup(function() { $(list.container).unbind("mousemove", trigger); $(dragHandle).css("cursor", $(dragHandle).attr("data-cursor")); });
},
dragStart: function(e) {
if (list != null && list.draggedItem != null)
list.dropItem();
list = lists[$(this).attr("data-listidx")];
list.draggedItem = $(e.target).closest(opts.itemSelector);
//record current position so on dragend we know if the dragged item changed position or not
list.draggedItem.attr("data-origpos", $(this).attr("data-listidx") + "-" + list.getItems().index(list.draggedItem));
//calculate mouse offset relative to draggedItem
var mt = parseInt(list.draggedItem.css("marginTop"));
var ml = parseInt(list.draggedItem.css("marginLeft"));
list.offset = list.draggedItem.offset();
list.offset.top = e.pageY - list.offset.top + (isNaN(mt) ? 0 : mt) - 1;
list.offset.left = e.pageX - list.offset.left + (isNaN(ml) ? 0 : ml) - 1;
//calculate box the dragged item can't be dragged outside of
if (!opts.dragBetween) {
var containerHeight = $(list.container).outerHeight() == 0 ? Math.max(1, Math.round(0.5 + list.getItems().size() * list.draggedItem.outerWidth() / $(list.container).outerWidth())) * list.draggedItem.outerHeight() : $(list.container).outerHeight();
list.offsetLimit = $(list.container).offset();
list.offsetLimit.right = list.offsetLimit.left + $(list.container).outerWidth() - list.draggedItem.outerWidth();
list.offsetLimit.bottom = list.offsetLimit.top + containerHeight - list.draggedItem.outerHeight();
}
//create placeholder item
var h = list.draggedItem.height();
var w = list.draggedItem.width();
if (opts.itemSelector == "tr") {
list.draggedItem.children().each(function() { $(this).width($(this).width()); });
list.placeHolderItem = list.draggedItem.clone().attr("data-placeholder", true);
list.draggedItem.after(list.placeHolderItem);
list.placeHolderItem.children().each(function() { $(this).css({ borderWidth:0, width: $(this).width() + 1, height: $(this).height() + 1 }).html(" "); });
} else {
list.draggedItem.after(opts.placeHolderTemplate);
list.placeHolderItem = list.draggedItem.next().css({ height: h, width: w }).attr("data-placeholder", true);
}
if (opts.itemSelector == "td") {
var listTable = list.draggedItem.closest("table").get(0);
$("<table id='" + listTable.id + "' style='border-width: 0px;' class='dragSortItem " + listTable.className + "'><tr></tr></table>").appendTo("body").children().append(list.draggedItem);
}
//style draggedItem while dragging
var orig = list.draggedItem.attr("style");
list.draggedItem.attr("data-origstyle", orig ? orig : "");
list.draggedItem.css({ position: "absolute", opacity: 0.8, "z-index": 999, height: h, width: w });
//auto-scroll setup
list.scroll = { moveX: 0, moveY: 0, maxX: $(document).width() - $(window).width(), maxY: $(document).height() - $(window).height() };
list.scroll.scrollY = window.setInterval(function() {
if (opts.scrollContainer != window) {
$(opts.scrollContainer).scrollTop($(opts.scrollContainer).scrollTop() + list.scroll.moveY);
return;
}
var t = $(opts.scrollContainer).scrollTop();
if (list.scroll.moveY > 0 && t < list.scroll.maxY || list.scroll.moveY < 0 && t > 0) {
$(opts.scrollContainer).scrollTop(t + list.scroll.moveY);
list.draggedItem.css("top", list.draggedItem.offset().top + list.scroll.moveY + 1);
}
}, 10);
list.scroll.scrollX = window.setInterval(function() {
if (opts.scrollContainer != window) {
$(opts.scrollContainer).scrollLeft($(opts.scrollContainer).scrollLeft() + list.scroll.moveX);
return;
}
var l = $(opts.scrollContainer).scrollLeft();
if (list.scroll.moveX > 0 && l < list.scroll.maxX || list.scroll.moveX < 0 && l > 0) {
$(opts.scrollContainer).scrollLeft(l + list.scroll.moveX);
list.draggedItem.css("left", list.draggedItem.offset().left + list.scroll.moveX + 1);
}
}, 10);
//misc
$(lists).each(function(i, l) { l.createDropTargets(); l.buildPositionTable(); });
list.setPos(e.pageX, e.pageY);
$(document).bind("mousemove", list.swapItems);
$(document).bind("mouseup", list.dropItem);
if (opts.scrollContainer != window)
$(window).bind("DOMMouseScroll mousewheel", list.wheel);
},
//set position of draggedItem
setPos: function(x, y) {
//remove mouse offset so mouse cursor remains in same place on draggedItem instead of top left corner
var top = y - this.offset.top;
var left = x - this.offset.left;
//limit top, left to within box draggedItem can't be dragged outside of
if (!opts.dragBetween) {
top = Math.min(this.offsetLimit.bottom, Math.max(top, this.offsetLimit.top));
left = Math.min(this.offsetLimit.right, Math.max(left, this.offsetLimit.left));
}
//adjust top, left calculations to parent element instead of window if it's relative or absolute
this.draggedItem.parents().each(function() {
if ($(this).css("position") != "static" && (!$.browser.mozilla || $(this).css("display") != "table")) {
var offset = $(this).offset();
top -= offset.top;
left -= offset.left;
return false;
}
});
//set x or y auto-scroll amount
if (opts.scrollContainer == window) {
y -= $(window).scrollTop();
x -= $(window).scrollLeft();
y = Math.max(0, y - $(window).height() + 5) + Math.min(0, y - 5);
x = Math.max(0, x - $(window).width() + 5) + Math.min(0, x - 5);
} else {
var cont = $(opts.scrollContainer);
var offset = cont.offset();
y = Math.max(0, y - cont.height() - offset.top) + Math.min(0, y - offset.top);
x = Math.max(0, x - cont.width() - offset.left) + Math.min(0, x - offset.left);
}
list.scroll.moveX = x == 0 ? 0 : x * opts.scrollSpeed / Math.abs(x);
list.scroll.moveY = y == 0 ? 0 : y * opts.scrollSpeed / Math.abs(y);
//move draggedItem to new mouse cursor location
this.draggedItem.css({ top: top, left: left });
},
//if scroll container is a div allow mouse wheel to scroll div instead of window when mouse is hovering over
wheel: function(e) {
if (($.browser.safari || $.browser.mozilla) && list && opts.scrollContainer != window) {
var cont = $(opts.scrollContainer);
var offset = cont.offset();
if (e.pageX > offset.left && e.pageX < offset.left + cont.width() && e.pageY > offset.top && e.pageY < offset.top + cont.height()) {
var delta = e.detail ? e.detail * 5 : e.wheelDelta / -2;
cont.scrollTop(cont.scrollTop() + delta);
e.preventDefault();
}
}
},
//build a table recording all the positions of the moveable list items
buildPositionTable: function() {
var pos = [];
this.getItems().not([list.draggedItem[0], list.placeHolderItem[0]]).each(function(i) {
var loc = $(this).offset();
loc.right = loc.left + $(this).outerWidth();
loc.bottom = loc.top + $(this).outerHeight();
loc.elm = this;
pos[i] = loc;
});
this.pos = pos;
},
dropItem: function() {
if (list.draggedItem == null)
return;
//list.draggedItem.attr("style", "") doesn't work on IE8 and jQuery 1.5 or lower
//list.draggedItem.removeAttr("style") doesn't work on chrome and jQuery 1.6 (works jQuery 1.5 or lower)
var orig = list.draggedItem.attr("data-origstyle");
list.draggedItem.attr("style", orig);
if (orig == "")
list.draggedItem.removeAttr("style");
list.draggedItem.removeAttr("data-origstyle");
list.styleDragHandlers(true);
list.placeHolderItem.before(list.draggedItem);
list.placeHolderItem.remove();
$("[data-droptarget], .dragSortItem").remove();
window.clearInterval(list.scroll.scrollY);
window.clearInterval(list.scroll.scrollX);
//if position changed call dragEnd
if (list.draggedItem.attr("data-origpos") != $(lists).index(list) + "-" + list.getItems().index(list.draggedItem))
opts.dragEnd.apply(list.draggedItem);
list.draggedItem.removeAttr("data-origpos");
list.draggedItem = null;
$(document).unbind("mousemove", list.swapItems);
$(document).unbind("mouseup", list.dropItem);
if (opts.scrollContainer != window)
$(window).unbind("DOMMouseScroll mousewheel", list.wheel);
return false;
},
//swap the draggedItem (represented visually by placeholder) with the list item the it has been dragged on top of
swapItems: function(e) {
if (list.draggedItem == null)
return false;
//move draggedItem to mouse location
list.setPos(e.pageX, e.pageY);
//retrieve list and item position mouse cursor is over
var ei = list.findPos(e.pageX, e.pageY);
var nlist = list;
for (var i = 0; ei == -1 && opts.dragBetween && i < lists.length; i++) {
ei = lists[i].findPos(e.pageX, e.pageY);
nlist = lists[i];
}
//if not over another moveable list item return
if (ei == -1)
return false;
//save fixed items locations
var children = function() { return $(nlist.container).children().not(nlist.draggedItem); };
var fixed = children().not(opts.itemSelector).each(function(i) { this.idx = children().index(this); });
//if moving draggedItem up or left place placeHolder before list item the dragged item is hovering over otherwise place it after
if (lastPos == null || lastPos.top > list.draggedItem.offset().top || lastPos.left > list.draggedItem.offset().left)
$(nlist.pos[ei].elm).before(list.placeHolderItem);
else
$(nlist.pos[ei].elm).after(list.placeHolderItem);
//restore fixed items location
fixed.each(function() {
var elm = children().eq(this.idx).get(0);
if (this != elm && children().index(this) < this.idx)
$(this).insertAfter(elm);
else if (this != elm)
$(this).insertBefore(elm);
});
//misc
$(lists).each(function(i, l) { l.createDropTargets(); l.buildPositionTable(); });
lastPos = list.draggedItem.offset();
return false;
},
//returns the index of the list item the mouse is over
findPos: function(x, y) {
for (var i = 0; i < this.pos.length; i++) {
if (this.pos[i].left < x && this.pos[i].right > x && this.pos[i].top < y && this.pos[i].bottom > y)
return i;
}
return -1;
},
//create drop targets which are placeholders at the end of other lists to allow dragging straight to the last position
createDropTargets: function() {
if (!opts.dragBetween)
return;
$(lists).each(function() {
var ph = $(this.container).find("[data-placeholder]");
var dt = $(this.container).find("[data-droptarget]");
if (ph.size() > 0 && dt.size() > 0)
dt.remove();
else if (ph.size() == 0 && dt.size() == 0) {
if (opts.itemSelector == "td")
$(opts.placeHolderTemplate).attr("data-droptarget", true).appendTo(this.container);
else
//list.placeHolderItem.clone().removeAttr("data-placeholder") crashes in IE7 and jquery 1.5.1 (doesn't in jquery 1.4.2 or IE8)
$(this.container).append(list.placeHolderItem.removeAttr("data-placeholder").clone().attr("data-droptarget", true));
list.placeHolderItem.attr("data-placeholder", true);
}
});
}
};
newList.init();
lists.push(newList);
});
return this;
};
$.fn.dragsort.defaults = {
itemSelector: "",
dragSelector: "",
dragSelectorExclude: "input, textarea",
dragEnd: function() { },
dragBetween: false,
placeHolderTemplate: "",
scrollContainer: window,
scrollSpeed: 5
}; })(jQuery);
大纲视图：
webstorm的就可以：
}}}
0 个回复