instiki/public/javascripts/dragdrop.js
2005-11-02 07:34:11 +00:00

516 lines
17 KiB
JavaScript

// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//
// Element.Class part Copyright (c) 2005 by Rick Olson
//
// See scriptaculous.js for full license.
/*--------------------------------------------------------------------------*/
var Droppables = {
drops: [],
remove: function(element) {
this.drops = this.drops.reject(function(d) { return d.element==element });
},
add: function(element) {
element = $(element);
var options = Object.extend({
greedy: true,
hoverclass: null
}, arguments[1] || {});
// cache containers
if(options.containment) {
options._containers = [];
var containment = options.containment;
if((typeof containment == 'object') &&
(containment.constructor == Array)) {
containment.each( function(c) { options._containers.push($(c)) });
} else {
options._containers.push($(containment));
}
}
Element.makePositioned(element); // fix IE
options.element = element;
this.drops.push(options);
},
isContained: function(element, drop) {
var parentNode = element.parentNode;
return drop._containers.detect(function(c) { return parentNode == c });
},
isAffected: function(pX, pY, element, drop) {
return (
(drop.element!=element) &&
((!drop._containers) ||
this.isContained(element, drop)) &&
((!drop.accept) ||
(Element.Class.has_any(element, drop.accept))) &&
Position.within(drop.element, pX, pY) );
},
deactivate: function(drop) {
if(drop.hoverclass)
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.length) 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.isAffected(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--);
if(this.last_active) this.deactivate(this.last_active);
},
fire: function(event, element) {
if(!this.last_active) return;
Position.prepare();
if (this.isAffected(Event.pointerX(event), Event.pointerY(event), element, this.last_active))
if (this.last_active.onDrop)
this.last_active.onDrop(element, this.last_active.element, event);
},
reset: function() {
if(this.last_active)
this.deactivate(this.last_active);
}
}
var Draggables = {
observers: [],
addObserver: function(observer) {
this.observers.push(observer);
},
removeObserver: function(element) { // element instead of obsever fixes mem leaks
this.observers = this.observers.reject( function(o) { return o.element==element });
},
notify: function(eventName, draggable) { // 'onStart', 'onEnd'
this.observers.invoke(eventName, draggable);
}
}
/*--------------------------------------------------------------------------*/
var 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) {
var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
new Effect.MoveBy(element, -top_offset, -left_offset, {duration:dur});
},
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);
if(options.handle && (typeof options.handle == 'string'))
this.handle = Element.Class.childrenWith(this.element, options.handle)[0];
if(!this.handle) this.handle = $(options.handle);
if(!this.handle) this.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.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);
this.registerEvents();
},
destroy: function() {
Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
this.unregisterEvents();
},
registerEvents: function() {
Event.observe(document, "mouseup", this.eventMouseUp);
Event.observe(document, "mousemove", this.eventMouseMove);
Event.observe(document, "keypress", this.eventKeypress);
Event.observe(this.handle, "mousedown", this.eventMouseDown);
},
unregisterEvents: function() {
//if(!this.active) return;
//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)) {
// abort on form elements, fixes a Firefox issue
var src = Event.element(event);
if(src.tagName && (
src.tagName=='INPUT' ||
src.tagName=='SELECT' ||
src.tagName=='BUTTON' ||
src.tagName=='TEXTAREA')) return;
// this.registerEvents();
this.active = true;
var pointer = [Event.pointerX(event), Event.pointerY(event)];
var offsets = Position.cumulativeOffset(this.element);
this.offsetX = (pointer[0] - offsets[0]);
this.offsetY = (pointer[1] - offsets[1]);
Event.stop(event);
}
},
finishDrag: function(event, success) {
// this.unregisterEvents();
this.active = false;
this.dragging = false;
if(this.options.ghosting) {
Position.relativize(this.element);
Element.remove(this._clone);
this._clone = null;
}
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();
}
if(this.options.zindex)
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 pointer = [Event.pointerX(event), Event.pointerY(event)];
var offsets = Position.cumulativeOffset(this.element);
offsets[0] -= this.currentLeft();
offsets[1] -= this.currentTop();
var style = this.element.style;
if((!this.options.constraint) || (this.options.constraint=='horizontal'))
style.left = (pointer[0] - offsets[0] - this.offsetX) + "px";
if((!this.options.constraint) || (this.options.constraint=='vertical'))
style.top = (pointer[1] - offsets[1] - 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(Element.getStyle(this.element,'position')=='')
style.position = "relative";
if(this.options.zindex) {
this.options.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
style.zIndex = this.options.zindex;
}
if(this.options.ghosting) {
this._clone = this.element.cloneNode(true);
Position.absolutize(this.element);
this.element.parentNode.insertBefore(this._clone, this.element);
}
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);
}
}
}
/*--------------------------------------------------------------------------*/
var 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() {
Sortable.unmark();
if(this.lastValue != Sortable.serialize(this.element))
this.observer(this.element)
}
}
var Sortable = {
sortables: new Array(),
options: function(element){
element = $(element);
return this.sortables.detect(function(s) { return s.element == element });
},
destroy: function(element){
element = $(element);
this.sortables.findAll(function(s) { return s.element == element }).each(function(s){
Draggables.removeObserver(s.element);
s.droppables.each(function(d){ Droppables.remove(d) });
s.draggables.invoke('destroy');
});
this.sortables = this.sortables.reject(function(s) { return s.element == element });
},
create: function(element) {
element = $(element);
var options = Object.extend({
element: element,
tag: 'li', // assumes li children, override with tag: 'tagname'
dropOnEmpty: false,
tree: false, // fixme: unimplemented
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,
ghosting: false,
format: 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,
ghosting: options.ghosting,
constraint: options.constraint,
handle: options.handle };
if(options.starteffect)
options_for_draggable.starteffect = options.starteffect;
if(options.reverteffect)
options_for_draggable.reverteffect = options.reverteffect;
else
if(options.ghosting) options_for_draggable.reverteffect = function(element) {
element.style.top = 0;
element.style.left = 0;
};
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: Sortable.onHover,
greedy: !options.dropOnEmpty
}
// fix for gecko engine
Element.cleanWhitespace(element);
options.draggables = [];
options.droppables = [];
// make it so
// drop on empty handling
if(options.dropOnEmpty) {
Droppables.add(element,
{containment: options.containment, onHover: Sortable.onEmptyHover, greedy: false});
options.droppables.push(element);
}
(this.findElements(element, options) || []).each( function(e) {
// handles are per-draggable
var handle = options.handle ?
Element.Class.childrenWith(e, options.handle)[0] : e;
options.draggables.push(
new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
Droppables.add(e, options_for_droppable);
options.droppables.push(e);
});
// keep reference
this.sortables.push(options);
// for onupdate
Draggables.addObserver(new SortableObserver(element, options.onUpdate));
},
// return all suitable-for-sortable elements in a guaranteed order
findElements: function(element, options) {
if(!element.hasChildNodes()) return null;
var elements = [];
$A(element.childNodes).each( function(e) {
if(e.tagName && e.tagName==options.tag.toUpperCase() &&
(!options.only || (Element.Class.has(e, options.only))))
elements.push(e);
if(options.tree) {
var grandchildren = this.findElements(e, options);
if(grandchildren) elements.push(grandchildren);
}
});
return (elements.length>0 ? elements.flatten() : null);
},
onHover: function(element, dropon, overlap) {
if(overlap>0.5) {
Sortable.mark(dropon, 'before');
if(dropon.previousSibling != element) {
var oldParentNode = element.parentNode;
element.style.visibility = "hidden"; // fix gecko rendering
dropon.parentNode.insertBefore(element, dropon);
if(dropon.parentNode!=oldParentNode)
Sortable.options(oldParentNode).onChange(element);
Sortable.options(dropon.parentNode).onChange(element);
}
} else {
Sortable.mark(dropon, 'after');
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)
Sortable.options(oldParentNode).onChange(element);
Sortable.options(dropon.parentNode).onChange(element);
}
}
},
onEmptyHover: function(element, dropon) {
if(element.parentNode!=dropon) {
dropon.appendChild(element);
}
},
unmark: function() {
if(Sortable._marker) Element.hide(Sortable._marker);
},
mark: function(dropon, position) {
// mark on ghosting only
var sortable = Sortable.options(dropon.parentNode);
if(sortable && !sortable.ghosting) return;
if(!Sortable._marker) {
Sortable._marker = $('dropmarker') || document.createElement('DIV');
Element.hide(Sortable._marker);
Element.Class.add(Sortable._marker, 'dropmarker');
Sortable._marker.style.position = 'absolute';
document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
}
var offsets = Position.cumulativeOffset(dropon);
Sortable._marker.style.top = offsets[1] + 'px';
if(position=='after') Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
Sortable._marker.style.left = offsets[0] + 'px';
Element.show(Sortable._marker);
},
serialize: function(element) {
element = $(element);
var sortableOptions = this.options(element);
var options = Object.extend({
tag: sortableOptions.tag,
only: sortableOptions.only,
name: element.id,
format: sortableOptions.format || /^[^_]*_(.*)$/
}, arguments[1] || {});
return $(this.findElements(element, options) || []).collect( function(item) {
return (encodeURIComponent(options.name) + "[]=" +
encodeURIComponent(item.id.match(options.format) ? item.id.match(options.format)[1] : ''));
}).join("&");
}
}