terom@27: // script.aculo.us dragdrop.js v1.8.0, Tue Nov 06 15:01:40 +0300 2007
terom@27: 
terom@27: // Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
terom@27: //           (c) 2005-2007 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
terom@27: // 
terom@27: // script.aculo.us is freely distributable under the terms of an MIT-style license.
terom@27: // For details, see the script.aculo.us web site: http://script.aculo.us/
terom@28: //
terom@28: // Modified by Tero Marttila to strip unused code
terom@27: 
terom@27: var Draggables = {
terom@27:   drags: [],
terom@27:   observers: [],
terom@27:   
terom@27:   register: function(draggable) {
terom@27:     if(this.drags.length == 0) {
terom@27:       this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
terom@27:       this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
terom@27:       this.eventKeypress  = this.keyPress.bindAsEventListener(this);
terom@27:       
terom@27:       Event.observe(document, "mouseup", this.eventMouseUp);
terom@27:       Event.observe(document, "mousemove", this.eventMouseMove);
terom@27:       Event.observe(document, "keypress", this.eventKeypress);
terom@27:     }
terom@27:     this.drags.push(draggable);
terom@27:   },
terom@27:   
terom@27:   unregister: function(draggable) {
terom@27:     this.drags = this.drags.reject(function(d) { return d==draggable });
terom@27:     if(this.drags.length == 0) {
terom@27:       Event.stopObserving(document, "mouseup", this.eventMouseUp);
terom@27:       Event.stopObserving(document, "mousemove", this.eventMouseMove);
terom@27:       Event.stopObserving(document, "keypress", this.eventKeypress);
terom@27:     }
terom@27:   },
terom@27:   
terom@27:   activate: function(draggable) {
terom@27:     if(draggable.options.delay) { 
terom@27:       this._timeout = setTimeout(function() { 
terom@27:         Draggables._timeout = null; 
terom@27:         window.focus(); 
terom@27:         Draggables.activeDraggable = draggable; 
terom@27:       }.bind(this), draggable.options.delay); 
terom@27:     } else {
terom@27:       window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
terom@27:       this.activeDraggable = draggable;
terom@27:     }
terom@27:   },
terom@27:   
terom@27:   deactivate: function() {
terom@27:     this.activeDraggable = null;
terom@27:   },
terom@27:   
terom@27:   updateDrag: function(event) {
terom@27:     if(!this.activeDraggable) return;
terom@27:     var pointer = [Event.pointerX(event), Event.pointerY(event)];
terom@27:     // Mozilla-based browsers fire successive mousemove events with
terom@27:     // the same coordinates, prevent needless redrawing (moz bug?)
terom@27:     if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
terom@27:     this._lastPointer = pointer;
terom@27:     
terom@27:     this.activeDraggable.updateDrag(event, pointer);
terom@27:   },
terom@27:   
terom@27:   endDrag: function(event) {
terom@27:     if(this._timeout) { 
terom@27:       clearTimeout(this._timeout); 
terom@27:       this._timeout = null; 
terom@27:     }
terom@27:     if(!this.activeDraggable) return;
terom@27:     this._lastPointer = null;
terom@27:     this.activeDraggable.endDrag(event);
terom@27:     this.activeDraggable = null;
terom@27:   },
terom@27:   
terom@27:   keyPress: function(event) {
terom@27:     if(this.activeDraggable)
terom@27:       this.activeDraggable.keyPress(event);
terom@27:   },
terom@27:   
terom@27:   addObserver: function(observer) {
terom@27:     this.observers.push(observer);
terom@27:     this._cacheObserverCallbacks();
terom@27:   },
terom@27:   
terom@27:   removeObserver: function(element) {  // element instead of observer fixes mem leaks
terom@27:     this.observers = this.observers.reject( function(o) { return o.element==element });
terom@27:     this._cacheObserverCallbacks();
terom@27:   },
terom@27:   
terom@27:   notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
terom@27:     if(this[eventName+'Count'] > 0)
terom@27:       this.observers.each( function(o) {
terom@27:         if(o[eventName]) o[eventName](eventName, draggable, event);
terom@27:       });
terom@27:     if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
terom@27:   },
terom@27:   
terom@27:   _cacheObserverCallbacks: function() {
terom@27:     ['onStart','onEnd','onDrag'].each( function(eventName) {
terom@27:       Draggables[eventName+'Count'] = Draggables.observers.select(
terom@27:         function(o) { return o[eventName]; }
terom@27:       ).length;
terom@27:     });
terom@27:   }
terom@27: }
terom@27: 
terom@27: /*--------------------------------------------------------------------------*/
terom@27: 
terom@27: var Draggable = Class.create({
terom@27:   initialize: function(element) {
terom@27:     var defaults = {
terom@27:       handle: false,
terom@27:       zindex: 1000,
terom@27:       quiet: false,
terom@27:       delay: 0
terom@27:     };
terom@27:     
terom@27:     var options = Object.extend(defaults, arguments[1] || { });
terom@27: 
terom@27:     this.element = $(element);
terom@27:     
terom@27:     if(options.handle && Object.isString(options.handle))
terom@27:       this.handle = this.element.down('.'+options.handle, 0);
terom@27:     
terom@27:     if(!this.handle) this.handle = $(options.handle);
terom@27:     if(!this.handle) this.handle = this.element;
terom@27:     
terom@27:     Element.makePositioned(this.element); // fix IE    
terom@27: 
terom@27:     this.options  = options;
terom@27:     this.dragging = false;   
terom@27: 
terom@27:     this.eventMouseDown = this.initDrag.bindAsEventListener(this);
terom@27:     Event.observe(this.handle, "mousedown", this.eventMouseDown);
terom@27:     
terom@27:     Draggables.register(this);
terom@27:   },
terom@27:   
terom@27:   destroy: function() {
terom@27:     Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
terom@27:     Draggables.unregister(this);
terom@27:   },
terom@27:   
terom@27:   currentDelta: function() {
terom@27:     return([
terom@27:       parseInt(Element.getStyle(this.element,'left') || '0'),
terom@27:       parseInt(Element.getStyle(this.element,'top') || '0')]);
terom@27:   },
terom@27:   
terom@27:   initDrag: function(event) {
terom@27:     if(!Object.isUndefined(Draggable._dragging[this.element]) &&
terom@27:       Draggable._dragging[this.element]) return;
terom@27:     if(Event.isLeftClick(event)) {    
terom@27:       // abort on form elements, fixes a Firefox issue
terom@27:       var src = Event.element(event);
terom@27:       if((tag_name = src.tagName.toUpperCase()) && (
terom@27:         tag_name=='INPUT' ||
terom@27:         tag_name=='SELECT' ||
terom@27:         tag_name=='OPTION' ||
terom@27:         tag_name=='BUTTON' ||
terom@27:         tag_name=='TEXTAREA')) return;
terom@27:         
terom@27:       var pointer = [Event.pointerX(event), Event.pointerY(event)];
terom@27:       var pos     = Position.cumulativeOffset(this.element);
terom@27:       this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
terom@27:       
terom@27:       Draggables.activate(this);
terom@27:       Event.stop(event);
terom@27:     }
terom@27:   },
terom@27:   
terom@27:   startDrag: function(event) {
terom@27:     this.dragging = true;
terom@27:     if(!this.delta)
terom@27:       this.delta = this.currentDelta();
terom@27:     
terom@27:     if(this.options.zindex) {
terom@27:       this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
terom@27:       this.element.style.zIndex = this.options.zindex;
terom@27:     }
terom@27:     
terom@27:     Draggables.notify('onStart', this, event);
terom@27:   },
terom@27:   
terom@27:   updateDrag: function(event, pointer) {
terom@27:     if(!this.dragging) this.startDrag(event);
terom@27:     
terom@27:     Draggables.notify('onDrag', this, event);
terom@27:     
terom@27:     this.draw(pointer);
terom@27:     if(this.options.change) this.options.change(this);
terom@27:     
terom@27:     // fix AppleWebKit rendering
terom@27:     if(Prototype.Browser.WebKit) window.scrollBy(0,0);
terom@27:     
terom@27:     Event.stop(event);
terom@27:   },
terom@27:   
terom@27:   finishDrag: function(event, success) {
terom@27:     this.dragging = false;
terom@27:     
terom@27:     Draggables.notify('onEnd', this, event);
terom@27: 
terom@27:     var d = this.currentDelta();
terom@28:     this.delta = d;
terom@27: 
terom@27:     if(this.options.zindex)
terom@27:       this.element.style.zIndex = this.originalZ;
terom@27: 
terom@27:     Draggables.deactivate(this);
terom@27:   },
terom@27:   
terom@27:   keyPress: function(event) {
terom@27:     if(event.keyCode!=Event.KEY_ESC) return;
terom@27:     this.finishDrag(event, false);
terom@27:     Event.stop(event);
terom@27:   },
terom@27:   
terom@27:   endDrag: function(event) {
terom@27:     if(!this.dragging) return;
terom@27:     this.finishDrag(event, true);
terom@27:     Event.stop(event);
terom@27:   },
terom@27:   
terom@27:   draw: function(point) {
terom@27:     var pos = Position.cumulativeOffset(this.element);
terom@27:     
terom@27:     var d = this.currentDelta();
terom@27:     pos[0] -= d[0]; pos[1] -= d[1];
terom@27:     
terom@27:     var p = [0,1].map(function(i){ 
terom@27:       return (point[i]-pos[i]-this.offset[i]) 
terom@27:     }.bind(this));
terom@27:     
terom@27:     var style = this.element.style;
terom@27:     if((!this.options.constraint) || (this.options.constraint=='horizontal'))
terom@27:       style.left = p[0] + "px";
terom@27:     if((!this.options.constraint) || (this.options.constraint=='vertical'))
terom@27:       style.top  = p[1] + "px";
terom@27:     
terom@27:     if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
terom@27:   },
terom@28:    
terom@27: });
terom@27: 
terom@27: Draggable._dragging = { };
terom@27: