dragdrop.js
583 lines
| 18.3 KiB
| application/javascript
|
JavascriptLexer
Jean-Philippe Lang
|
r2 | // Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us) | |
| // | |||
| // 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)); | |||
| } | |||
| } | |||
| if(options.accept) options.accept = [options.accept].flatten(); | |||
| 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(point, element, drop) { | |||
| return ( | |||
| (drop.element!=element) && | |||
| ((!drop._containers) || | |||
| this.isContained(element, drop)) && | |||
| ((!drop.accept) || | |||
| (Element.classNames(element).detect( | |||
| function(v) { return drop.accept.include(v) } ) )) && | |||
| Position.within(drop.element, point[0], point[1]) ); | |||
| }, | |||
| deactivate: function(drop) { | |||
| if(drop.hoverclass) | |||
| Element.removeClassName(drop.element, drop.hoverclass); | |||
| this.last_active = null; | |||
| }, | |||
| activate: function(drop) { | |||
| if(drop.hoverclass) | |||
| Element.addClassName(drop.element, drop.hoverclass); | |||
| this.last_active = drop; | |||
| }, | |||
| show: function(point, element) { | |||
| if(!this.drops.length) return; | |||
| if(this.last_active) this.deactivate(this.last_active); | |||
| this.drops.each( function(drop) { | |||
| if(Droppables.isAffected(point, element, drop)) { | |||
| if(drop.onHover) | |||
| drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element)); | |||
| if(drop.greedy) { | |||
| Droppables.activate(drop); | |||
| throw $break; | |||
| } | |||
| } | |||
| }); | |||
| }, | |||
| 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 = { | |||
| drags: [], | |||
| observers: [], | |||
| register: function(draggable) { | |||
| if(this.drags.length == 0) { | |||
| this.eventMouseUp = this.endDrag.bindAsEventListener(this); | |||
| this.eventMouseMove = this.updateDrag.bindAsEventListener(this); | |||
| this.eventKeypress = this.keyPress.bindAsEventListener(this); | |||
| Event.observe(document, "mouseup", this.eventMouseUp); | |||
| Event.observe(document, "mousemove", this.eventMouseMove); | |||
| Event.observe(document, "keypress", this.eventKeypress); | |||
| } | |||
| this.drags.push(draggable); | |||
| }, | |||
| unregister: function(draggable) { | |||
| this.drags = this.drags.reject(function(d) { return d==draggable }); | |||
| if(this.drags.length == 0) { | |||
| Event.stopObserving(document, "mouseup", this.eventMouseUp); | |||
| Event.stopObserving(document, "mousemove", this.eventMouseMove); | |||
| Event.stopObserving(document, "keypress", this.eventKeypress); | |||
| } | |||
| }, | |||
| activate: function(draggable) { | |||
| window.focus(); // allows keypress events if window isn't currently focused, fails for Safari | |||
| this.activeDraggable = draggable; | |||
| }, | |||
| deactivate: function(draggbale) { | |||
| this.activeDraggable = null; | |||
| }, | |||
| updateDrag: function(event) { | |||
| if(!this.activeDraggable) return; | |||
| var pointer = [Event.pointerX(event), Event.pointerY(event)]; | |||
| // Mozilla-based browsers fire successive mousemove events with | |||
| // the same coordinates, prevent needless redrawing (moz bug?) | |||
| if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return; | |||
| this._lastPointer = pointer; | |||
| this.activeDraggable.updateDrag(event, pointer); | |||
| }, | |||
| endDrag: function(event) { | |||
| if(!this.activeDraggable) return; | |||
| this._lastPointer = null; | |||
| this.activeDraggable.endDrag(event); | |||
| }, | |||
| keyPress: function(event) { | |||
| if(this.activeDraggable) | |||
| this.activeDraggable.keyPress(event); | |||
| }, | |||
| addObserver: function(observer) { | |||
| this.observers.push(observer); | |||
| this._cacheObserverCallbacks(); | |||
| }, | |||
| removeObserver: function(element) { // element instead of observer fixes mem leaks | |||
| this.observers = this.observers.reject( function(o) { return o.element==element }); | |||
| this._cacheObserverCallbacks(); | |||
| }, | |||
| notify: function(eventName, draggable, event) { // 'onStart', 'onEnd', 'onDrag' | |||
| if(this[eventName+'Count'] > 0) | |||
| this.observers.each( function(o) { | |||
| if(o[eventName]) o[eventName](eventName, draggable, event); | |||
| }); | |||
| }, | |||
| _cacheObserverCallbacks: function() { | |||
| ['onStart','onEnd','onDrag'].each( function(eventName) { | |||
| Draggables[eventName+'Count'] = Draggables.observers.select( | |||
| function(o) { return o[eventName]; } | |||
| ).length; | |||
| }); | |||
| } | |||
| } | |||
| /*--------------------------------------------------------------------------*/ | |||
| 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; | |||
| element._revert = 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, | |||
| snap: false // false, or xy or [x,y] or function(x,y){ return [x,y] } | |||
| }, arguments[1] || {}); | |||
| this.element = $(element); | |||
| if(options.handle && (typeof options.handle == 'string')) | |||
| this.handle = Element.childrenWithClassName(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.delta = this.currentDelta(); | |||
| this.options = options; | |||
| this.dragging = false; | |||
| this.eventMouseDown = this.initDrag.bindAsEventListener(this); | |||
| Event.observe(this.handle, "mousedown", this.eventMouseDown); | |||
| Draggables.register(this); | |||
| }, | |||
| destroy: function() { | |||
| Event.stopObserving(this.handle, "mousedown", this.eventMouseDown); | |||
| Draggables.unregister(this); | |||
| }, | |||
| currentDelta: function() { | |||
| return([ | |||
| parseInt(this.element.style.left || '0'), | |||
| parseInt(this.element.style.top || '0')]); | |||
| }, | |||
| initDrag: 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; | |||
| if(this.element._revert) { | |||
| this.element._revert.cancel(); | |||
| this.element._revert = null; | |||
| } | |||
| var pointer = [Event.pointerX(event), Event.pointerY(event)]; | |||
| var pos = Position.cumulativeOffset(this.element); | |||
| this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) }); | |||
| Draggables.activate(this); | |||
| Event.stop(event); | |||
| } | |||
| }, | |||
| startDrag: function(event) { | |||
| this.dragging = true; | |||
| if(this.options.zindex) { | |||
| this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0); | |||
| this.element.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, event); | |||
| if(this.options.starteffect) this.options.starteffect(this.element); | |||
| }, | |||
| updateDrag: function(event, pointer) { | |||
| if(!this.dragging) this.startDrag(event); | |||
| Position.prepare(); | |||
| Droppables.show(pointer, this.element); | |||
| Draggables.notify('onDrag', this, event); | |||
| this.draw(pointer); | |||
| if(this.options.change) this.options.change(this); | |||
| // fix AppleWebKit rendering | |||
| if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0); | |||
| Event.stop(event); | |||
| }, | |||
| finishDrag: function(event, success) { | |||
| 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, event); | |||
| var revert = this.options.revert; | |||
| if(revert && typeof revert == 'function') revert = revert(this.element); | |||
| var d = this.currentDelta(); | |||
| if(revert && this.options.reverteffect) { | |||
| this.options.reverteffect(this.element, | |||
| d[1]-this.delta[1], d[0]-this.delta[0]); | |||
| } else { | |||
| this.delta = d; | |||
| } | |||
| if(this.options.zindex) | |||
| this.element.style.zIndex = this.originalZ; | |||
| if(this.options.endeffect) | |||
| this.options.endeffect(this.element); | |||
| Draggables.deactivate(this); | |||
| Droppables.reset(); | |||
| }, | |||
| keyPress: function(event) { | |||
| if(!event.keyCode==Event.KEY_ESC) return; | |||
| this.finishDrag(event, false); | |||
| Event.stop(event); | |||
| }, | |||
| endDrag: function(event) { | |||
| if(!this.dragging) return; | |||
| this.finishDrag(event, true); | |||
| Event.stop(event); | |||
| }, | |||
| draw: function(point) { | |||
| var pos = Position.cumulativeOffset(this.element); | |||
| var d = this.currentDelta(); | |||
| pos[0] -= d[0]; pos[1] -= d[1]; | |||
| var p = [0,1].map(function(i){ return (point[i]-pos[i]-this.offset[i]) }.bind(this)); | |||
| if(this.options.snap) { | |||
| if(typeof this.options.snap == 'function') { | |||
| p = this.options.snap(p[0],p[1]); | |||
| } else { | |||
| if(this.options.snap instanceof Array) { | |||
| p = p.map( function(v, i) { | |||
| return Math.round(v/this.options.snap[i])*this.options.snap[i] }.bind(this)) | |||
| } else { | |||
| p = p.map( function(v) { | |||
| return Math.round(v/this.options.snap)*this.options.snap }.bind(this)) | |||
| } | |||
| }} | |||
| var style = this.element.style; | |||
| if((!this.options.constraint) || (this.options.constraint=='horizontal')) | |||
| style.left = p[0] + "px"; | |||
| if((!this.options.constraint) || (this.options.constraint=='vertical')) | |||
| style.top = p[1] + "px"; | |||
| if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering | |||
| } | |||
| } | |||
| /*--------------------------------------------------------------------------*/ | |||
| 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: Prototype.emptyFunction, | |||
| onUpdate: Prototype.emptyFunction | |||
| }, 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.childrenWithClassName(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.toUpperCase()==options.tag.toUpperCase() && | |||
| (!options.only || (Element.hasClassName(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) { | |||
| var oldParentNode = element.parentNode; | |||
| dropon.appendChild(element); | |||
| Sortable.options(oldParentNode).onChange(element); | |||
| Sortable.options(dropon).onChange(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.addClassName(Sortable._marker, 'dropmarker'); | |||
| Sortable._marker.style.position = 'absolute'; | |||
| document.getElementsByTagName("body").item(0).appendChild(Sortable._marker); | |||
| } | |||
| var offsets = Position.cumulativeOffset(dropon); | |||
| Sortable._marker.style.left = offsets[0] + 'px'; | |||
| Sortable._marker.style.top = offsets[1] + 'px'; | |||
| if(position=='after') | |||
| if(sortable.overlap == 'horizontal') | |||
| Sortable._marker.style.left = (offsets[0]+dropon.clientWidth) + 'px'; | |||
| else | |||
| Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + '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) || []).map( function(item) { | |||
| return (encodeURIComponent(options.name) + "[]=" + | |||
| encodeURIComponent(item.id.match(options.format) ? item.id.match(options.format)[1] : '')); | |||
| }).join("&"); | |||
| } | |||
| } |