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(function($) {
$.fn.connections = function(options) {
if (options === 'update') {
return processConnections(update, this);
} else if (options === 'remove') {
return processConnections(destroy, this);
} else {
options = $.extend(true, {
borderClasses: {},
'class': 'connection',
css: {},
from: this,
tag: 'connection',
to: this,
within: ':root'
}, options);
connect(options);
return this;
}
};
$.event.special.connections = {
teardown: function(namespaces) {
processConnections(destroy, $(this));
}
}
var connect = function(options) {
var borderClasses = options.borderClasses;
var tag = options.tag;
var end1 = $(options.from);
var end2 = $(options.to);
var within = $(options.within);
delete options.borderClasses;
delete options.tag;
delete options.from;
delete options.to;
delete options.within;
within.each(function() {
var container = this;
var done = new Array();
end1.each(function() {
var node = this;
done.push(this);
end2.not(done).each(function() {
createConnection(container, [node, this], tag, borderClasses, options);
});
});
});
};
var createConnection = function(container, nodes, tag, borderClasses, options) {
var css = $.extend({ position: 'absolute' }, options.css);
var connection = $('<' + tag + '/>', options).css(css);
connection.appendTo(container);
var border_w = (connection.outerWidth() - connection.innerWidth()) / 2;
var border_h = (connection.outerHeight() - connection.innerHeight()) / 2;
if (border_w <= 0 && border_h <= 0) {
border_w = border_h = 1;
}
var data = {
borderClasses: borderClasses,
border_h: border_h,
border_w: border_w,
node_from: $(nodes[0]),
node_to: $(nodes[1]),
nodes_dom: nodes,
css: css
}
if ('none' === connection.css('border-top-style')) {
data.css.borderStyle = 'solid';
}
$.data(connection.get(0), 'connection', data);
$.data(connection.get(0), 'connections', [connection.get(0)]);
for (var i = 0; i < 2; i++) {
var connections = connection.add($.data(nodes[i], 'connections')).get();
$.data(nodes[i], 'connections', connections);
if (connections.length == 1) {
$(nodes[i]).on('connections.connections', false);
}
}
update(connection.get(0));
};
var destroy = function(connection) {
var nodes = $.data(connection, 'connection').nodes_dom;
for (var i = 0; i < 2; i++) {
var connections = $($.data(nodes[i], 'connections')).not(connection).get();
$.data(nodes[i], 'connections', connections);
}
$(connection).remove();
};
var getState = function(data) {
data.rect_from = data.nodes_dom[0].getBoundingClientRect();
data.rect_to = data.nodes_dom[1].getBoundingClientRect();
var cached = data.cache;
data.cache = [
data.rect_from.top, data.rect_from.right, data.rect_from.bottom, data.rect_from.left,
data.rect_to.top, data.rect_to.right, data.rect_to.bottom, data.rect_to.left
];
data.hidden = (0 === (data.cache[0] | data.cache[1] | data.cache[2] | data.cache[3])) ||
(0 === (data.cache[4] | data.cache[5] | data.cache[6] | data.cache[7]));
data.unmodified = true;
if (cached === undefined) {
return data.unmodified = false;
}
for (var i = 0; i < 8; i++) {
if (cached[i] !== data.cache[i]) {
return data.unmodified = false;
}
}
}
var update = function(connection) {
var data = $.data(connection, 'connection');
getState(data);
if (data.unmodified) {
return;
}
var border_h = data.border_h;
var border_w = data.border_w;
var from_node = data.node_from;
var to_node = data.node_to;
var from = data.rect_from;
var to = data.rect_to;
var b = (from.bottom + from.top) / 2;
var r = (to.left + to.right) / 2;
var t = (to.bottom + to.top) / 2;
var l = (from.left + from.right) / 2;
var h = ['right', 'left'];
if (l > r) {
h = h.reverse();
var x = Math.max(r - border_w / 2, Math.min(from.right, to.right));
r = l + border_w / 2;
l = x;
} else {
l -= border_w / 2;
r = Math.min(r + border_w / 2, Math.max(from.left, to.left));
}
var v = ['bottom', 'top'];
if (t > b) {
v = v.reverse();
var x = Math.max(b - border_h / 2, Math.min(from.bottom, to.bottom));
b = t + border_h / 2;
t = x;
} else {
b = Math.min(b, Math.max(from.top, to.top));
t -= border_h / 2;
}
var width = r - l;
var height = b - t;
if (width < border_w) {
t = Math.max(t, Math.min(from.bottom, to.bottom));
b = Math.min(b, Math.max(from.top, to.top));
l = Math.max(from.left, to.left);
r = Math.min(from.right, to.right);
r = l = (l + r - border_w) / 2;
}
if (height < border_h) {
l = Math.max(l, Math.min(from.right, to.right));
r = Math.min(r, Math.max(from.left, to.left));
t = Math.max(from.top, to.top);
b = Math.min(from.bottom, to.bottom);
b = t = (t + b - border_h) / 2;
}
width = r - l;
height = b - t;
width <= 0 && (border_h = 0);
height <= 0 && (border_w = 0);
var style =
'border-' + v[0] + '-' + h[0] + '-radius: 0;' +
'border-' + v[0] + '-' + h[1] + '-radius: 0;' +
'border-' + v[1] + '-' + h[0] + '-radius: 0;';
(border_h <= 0 || border_w <= 0) && (style += 'border-' + v[1] + '-' + h[1] + '-radius: 0;');
if (data.hidden) {
style += 'display: none;';
} else {
data.css['border-' + v[0] + '-width'] = 0;
data.css['border-' + h[0] + '-width'] = 0;
data.css['border-' + v[1] + '-width'] = border_h;
data.css['border-' + h[1] + '-width'] = border_w;
var current_rect = connection.getBoundingClientRect();
data.css.left = connection.offsetLeft + l - current_rect.left;
data.css.top = connection.offsetTop + t - current_rect.top;
data.css.width = width - border_w;
data.css.height = height - border_h;
}
var bc = data.borderClasses;
$(connection).
removeClass(bc[v[0]]).removeClass(bc[h[0]]).
addClass(bc[v[1]]).addClass(bc[h[1]]).
attr('style', style).
css(data.css);
}
var processConnections = function(method, elements) {
return elements.each(function() {
var connections = $.data(this, 'connections');
if (connections instanceof Array) {
for (var i = 0, len = connections.length; i < len; i++) {
method(connections[i]);
}
}
});
};
})(jQuery);
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