instiki/public/javascripts/dragdrop.js

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// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//
// Element.Class part Copyright (c) 2005 by Rick Olson
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Element.Class = {
// Element.toggleClass(element, className) toggles the class being on/off
// Element.toggleClass(element, className1, className2) toggles between both classes,
// defaulting to className1 if neither exist
toggle: function(element, className) {
if(Element.Class.has(element, className)) {
Element.Class.remove(element, className);
if(arguments.length == 3) Element.Class.add(element, arguments[2]);
} else {
Element.Class.add(element, className);
if(arguments.length == 3) Element.Class.remove(element, arguments[2]);
}
},
// gets space-delimited classnames of an element as an array
get: function(element) {
element = $(element);
return element.className.split(' ');
},
// functions adapted from original functions by Gavin Kistner
remove: function(element) {
element = $(element);
var regEx;
for(var i = 1; i < arguments.length; i++) {
regEx = new RegExp("^" + arguments[i] + "\\b\\s*|\\s*\\b" + arguments[i] + "\\b", 'g');
element.className = element.className.replace(regEx, '')
}
},
add: function(element) {
element = $(element);
for(var i = 1; i < arguments.length; i++) {
Element.Class.remove(element, arguments[i]);
element.className += (element.className.length > 0 ? ' ' : '') + arguments[i];
}
},
// returns true if all given classes exist in said element
has: function(element) {
element = $(element);
if(!element || !element.className) return false;
var regEx;
for(var i = 1; i < arguments.length; i++) {
regEx = new RegExp("\\b" + arguments[i] + "\\b");
if(!regEx.test(element.className)) return false;
}
return true;
},
// expects arrays of strings and/or strings as optional paramters
// Element.Class.has_any(element, ['classA','classB','classC'], 'classD')
has_any: function(element) {
element = $(element);
if(!element || !element.className) return false;
var regEx;
for(var i = 1; i < arguments.length; i++) {
if((typeof arguments[i] == 'object') &&
(arguments[i].constructor == Array)) {
for(var j = 0; j < arguments[i].length; j++) {
regEx = new RegExp("\\b" + arguments[i][j] + "\\b");
if(regEx.test(element.className)) return true;
}
} else {
regEx = new RegExp("\\b" + arguments[i] + "\\b");
if(regEx.test(element.className)) return true;
}
}
return false;
},
childrenWith: function(element, className) {
var children = $(element).getElementsByTagName('*');
var elements = new Array();
for (var i = 0; i < children.length; i++) {
if (Element.Class.has(children[i], className)) {
elements.push(children[i]);
break;
}
}
return elements;
}
}
/*--------------------------------------------------------------------------*/
var Droppables = {
drops: false,
remove: function(element) {
for(var i = 0; i < this.drops.length; i++)
if(this.drops[i].element == element)
this.drops.splice(i,1);
},
add: function(element) {
var element = $(element);
var options = Object.extend({
greedy: true,
hoverclass: null
}, arguments[1] || {});
// cache containers
if(options.containment) {
options._containers = new Array();
var containment = options.containment;
if((typeof containment == 'object') &&
(containment.constructor == Array)) {
for(var i=0; i<containment.length; i++)
options._containers.push($(containment[i]));
} else {
options._containers.push($(containment));
}
options._containers_length =
options._containers.length-1;
}
Element.makePositioned(element); // fix IE
options.element = element;
// activate the droppable
if(!this.drops) this.drops = [];
this.drops.push(options);
},
is_contained: function(element, drop) {
var containers = drop._containers;
var parentNode = element.parentNode;
var i = drop._containers_length;
do { if(parentNode==containers[i]) return true; } while (i--);
return false;
},
is_affected: function(pX, pY, element, drop) {
return (
(drop.element!=element) &&
((!drop._containers) ||
this.is_contained(element, drop)) &&
((!drop.accept) ||
(Element.Class.has_any(element, drop.accept))) &&
Position.within(drop.element, pX, pY) );
},
deactivate: function(drop) {
Element.Class.remove(drop.element, drop.hoverclass);
this.last_active = null;
},
activate: function(drop) {
if(this.last_active) this.deactivate(this.last_active);
if(drop.hoverclass) {
Element.Class.add(drop.element, drop.hoverclass);
this.last_active = drop;
}
},
show: function(event, element) {
if(!this.drops) return;
var pX = Event.pointerX(event);
var pY = Event.pointerY(event);
Position.prepare();
var i = this.drops.length-1; do {
var drop = this.drops[i];
if(this.is_affected(pX, pY, element, drop)) {
if(drop.onHover)
drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
if(drop.greedy) {
this.activate(drop);
return;
}
}
} while (i--);
},
fire: function(event, element) {
if(!this.last_active) return;
Position.prepare();
if (this.is_affected(Event.pointerX(event), Event.pointerY(event), element, this.last_active))
if (this.last_active.onDrop)
this.last_active.onDrop(element, this.last_active);
},
reset: function() {
if(this.last_active)
this.deactivate(this.last_active);
}
}
Draggables = {
observers: new Array(),
addObserver: function(observer) {
this.observers.push(observer);
},
removeObserver: function(element) { // element instead of obsever fixes mem leaks
for(var i = 0; i < this.observers.length; i++)
if(this.observers[i].element && (this.observers[i].element == element))
this.observers.splice(i,1);
},
notify: function(eventName, draggable) { // 'onStart', 'onEnd'
for(var i = 0; i < this.observers.length; i++)
this.observers[i][eventName](draggable);
}
}
/*--------------------------------------------------------------------------*/
Draggable = Class.create();
Draggable.prototype = {
initialize: function(element) {
var options = Object.extend({
handle: false,
starteffect: function(element) {
new Effect.Opacity(element, {duration:0.2, from:1.0, to:0.7});
},
reverteffect: function(element, top_offset, left_offset) {
new Effect.MoveBy(element, -top_offset, -left_offset, {duration:0.4});
},
endeffect: function(element) {
new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0});
},
zindex: 1000,
revert: false
}, arguments[1] || {});
this.element = $(element);
this.handle = options.handle ? $(options.handle) : this.element;
Element.makePositioned(this.element); // fix IE
this.offsetX = 0;
this.offsetY = 0;
this.originalLeft = this.currentLeft();
this.originalTop = this.currentTop();
this.originalX = this.element.offsetLeft;
this.originalY = this.element.offsetTop;
this.originalZ = parseInt(this.element.style.zIndex || "0");
this.options = options;
this.active = false;
this.dragging = false;
this.eventMouseDown = this.startDrag.bindAsEventListener(this);
this.eventMouseUp = this.endDrag.bindAsEventListener(this);
this.eventMouseMove = this.update.bindAsEventListener(this);
this.eventKeypress = this.keyPress.bindAsEventListener(this);
Event.observe(this.handle, "mousedown", this.eventMouseDown);
Event.observe(document, "mouseup", this.eventMouseUp);
Event.observe(document, "mousemove", this.eventMouseMove);
Event.observe(document, "keypress", this.eventKeypress);
},
destroy: function() {
Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
Event.stopObserving(document, "mouseup", this.eventMouseUp);
Event.stopObserving(document, "mousemove", this.eventMouseMove);
Event.stopObserving(document, "keypress", this.eventKeypress);
},
currentLeft: function() {
return parseInt(this.element.style.left || '0');
},
currentTop: function() {
return parseInt(this.element.style.top || '0')
},
startDrag: function(event) {
if(Event.isLeftClick(event)) {
this.active = true;
var style = this.element.style;
this.originalY = this.element.offsetTop - this.currentTop() - this.originalTop;
this.originalX = this.element.offsetLeft - this.currentLeft() - this.originalLeft;
this.offsetY = event.clientY - this.originalY - this.originalTop;
this.offsetX = event.clientX - this.originalX - this.originalLeft;
Event.stop(event);
}
},
finishDrag: function(event, success) {
this.active = false;
this.dragging = false;
if(success) Droppables.fire(event, this.element);
Draggables.notify('onEnd', this);
var revert = this.options.revert;
if(revert && typeof revert == 'function') revert = revert(this.element);
if(revert && this.options.reverteffect) {
this.options.reverteffect(this.element,
this.currentTop()-this.originalTop,
this.currentLeft()-this.originalLeft);
} else {
this.originalLeft = this.currentLeft();
this.originalTop = this.currentTop();
}
this.element.style.zIndex = this.originalZ;
if(this.options.endeffect)
this.options.endeffect(this.element);
Droppables.reset();
},
keyPress: function(event) {
if(this.active) {
if(event.keyCode==Event.KEY_ESC) {
this.finishDrag(event, false);
Event.stop(event);
}
}
},
endDrag: function(event) {
if(this.active && this.dragging) {
this.finishDrag(event, true);
Event.stop(event);
}
this.active = false;
this.dragging = false;
},
draw: function(event) {
var style = this.element.style;
this.originalX = this.element.offsetLeft - this.currentLeft() - this.originalLeft;
this.originalY = this.element.offsetTop - this.currentTop() - this.originalTop;
if((!this.options.constraint) || (this.options.constraint=='horizontal'))
style.left = ((event.clientX - this.originalX) - this.offsetX) + "px";
if((!this.options.constraint) || (this.options.constraint=='vertical'))
style.top = ((event.clientY - this.originalY) - this.offsetY) + "px";
if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
},
update: function(event) {
if(this.active) {
if(!this.dragging) {
var style = this.element.style;
this.dragging = true;
if(style.position=="") style.position = "relative";
style.zIndex = this.options.zindex;
Draggables.notify('onStart', this);
if(this.options.starteffect) this.options.starteffect(this.element);
}
Droppables.show(event, this.element);
this.draw(event);
if(this.options.change) this.options.change(this);
// fix AppleWebKit rendering
if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
Event.stop(event);
}
}
}
/*--------------------------------------------------------------------------*/
SortableObserver = Class.create();
SortableObserver.prototype = {
initialize: function(element, observer) {
this.element = $(element);
this.observer = observer;
this.lastValue = Sortable.serialize(this.element);
},
onStart: function() {
this.lastValue = Sortable.serialize(this.element);
},
onEnd: function() {
if(this.lastValue != Sortable.serialize(this.element))
this.observer(this.element)
}
}
Sortable = {
sortables: new Array(),
options: function(element){
var element = $(element);
for(var i=0;i<this.sortables.length;i++)
if(this.sortables[i].element == element)
return this.sortables[i];
return null;
},
destroy: function(element){
var element = $(element);
for(var i=0;i<this.sortables.length;i++) {
if(this.sortables[i].element == element) {
var s = this.sortables[i];
Draggables.removeObserver(s.element);
for(var j=0;j<s.droppables.length;j++)
Droppables.remove(s.droppables[j]);
for(var j=0;j<s.draggables.length;j++)
s.draggables[j].destroy();
this.sortables.splice(i,1);
}
}
},
create: function(element) {
var element = $(element);
var options = Object.extend({
element: element,
tag: 'li', // assumes li children, override with tag: 'tagname'
overlap: 'vertical', // one of 'vertical', 'horizontal'
constraint: 'vertical', // one of 'vertical', 'horizontal', false
containment: element, // also takes array of elements (or id's); or false
handle: false, // or a CSS class
only: false,
hoverclass: null,
onChange: function() {},
onUpdate: function() {}
}, arguments[1] || {});
// clear any old sortable with same element
this.destroy(element);
// build options for the draggables
var options_for_draggable = {
revert: true,
constraint: options.constraint,
handle: handle };
if(options.starteffect)
options_for_draggable.starteffect = options.starteffect;
if(options.reverteffect)
options_for_draggable.reverteffect = options.reverteffect;
if(options.endeffect)
options_for_draggable.endeffect = options.endeffect;
if(options.zindex)
options_for_draggable.zindex = options.zindex;
// build options for the droppables
var options_for_droppable = {
overlap: options.overlap,
containment: options.containment,
hoverclass: options.hoverclass,
onHover: function(element, dropon, overlap) {
if(overlap>0.5) {
if(dropon.previousSibling != element) {
var oldParentNode = element.parentNode;
element.style.visibility = "hidden"; // fix gecko rendering
dropon.parentNode.insertBefore(element, dropon);
if(dropon.parentNode!=oldParentNode && oldParentNode.sortable)
oldParentNode.sortable.onChange(element);
if(dropon.parentNode.sortable)
dropon.parentNode.sortable.onChange(element);
}
} else {
var nextElement = dropon.nextSibling || null;
if(nextElement != element) {
var oldParentNode = element.parentNode;
element.style.visibility = "hidden"; // fix gecko rendering
dropon.parentNode.insertBefore(element, nextElement);
if(dropon.parentNode!=oldParentNode && oldParentNode.sortable)
oldParentNode.sortable.onChange(element);
if(dropon.parentNode.sortable)
dropon.parentNode.sortable.onChange(element);
}
}
}
}
// fix for gecko engine
Element.cleanWhitespace(element);
options.draggables = [];
options.droppables = [];
// make it so
var elements = element.childNodes;
for (var i = 0; i < elements.length; i++)
if(elements[i].tagName && elements[i].tagName==options.tag.toUpperCase() &&
(!options.only || (Element.Class.has(elements[i], options.only)))) {
// handles are per-draggable
var handle = options.handle ?
Element.Class.childrenWith(elements[i], options.handle)[0] : elements[i];
options.draggables.push(new Draggable(elements[i], Object.extend(options_for_draggable, { handle: handle })));
Droppables.add(elements[i], options_for_droppable);
options.droppables.push(elements[i]);
}
// keep reference
this.sortables.push(options);
// for onupdate
Draggables.addObserver(new SortableObserver(element, options.onUpdate));
},
serialize: function(element) {
var element = $(element);
var sortableOptions = this.options(element);
var options = Object.extend({
tag: sortableOptions.tag,
only: sortableOptions.only,
name: element.id
}, arguments[1] || {});
var items = $(element).childNodes;
var queryComponents = new Array();
for(var i=0; i<items.length; i++)
if(items[i].tagName && items[i].tagName==options.tag.toUpperCase() &&
(!options.only || (Element.Class.has(items[i], options.only))))
queryComponents.push(
encodeURIComponent(options.name) + "[]=" +
encodeURIComponent(items[i].id.split("_")[1]));
return queryComponents.join("&");
}
}