/*Copyright (c) 2006 Adobe Systems Incorporated
  
  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.
  */
  package qs.controls {
  
          import flash.display.DisplayObjectContainer;
          import flash.utils.Timer;
          import flash.events.TimerEvent;
          import mx.core.IFlexDisplayObject;
          import flash.geom.Matrix;
          import flash.display.DisplayObject;
          import flash.utils.Dictionary;
          import mx.core.IUIComponent;
                  
          public class @ax-actionscript-extra-fisheye-qs-controls-LayoutAnimator {
  
                  private static var running:Number = 0;
                  private const SCALE_TOLERANCE:Number = .01;
                  private const ALPHA_TOLERANCE:Number = .01;
                  private const TRANSLATE_TOLERANCE:Number = .5;
                  private const DEFAULT_ANIMATION_SPEED:Number = .25;
                  private const SIZE_TOLERANCE:Number = .5;
                  private var _priorityInvalid:Boolean = true;
                  public var layoutFunction:Function;
                  public var updateFunction:Function;
                  public var autoPrioritize:Boolean = true;
                  private var _removedTargets:Dictionary;
                  private var _targets:Dictionary;
                  private var _oldTargets:Dictionary;
                  private var _orderedTargets:Array;
                  private var _layoutInvalid:Boolean = false;
                  private var _animationSpeed:Number = DEFAULT_ANIMATION_SPEED;
                  private var _timer:Timer;
                  public var  initializeFunction:Function;
                  public var releaseFunction:Function;
                  public var removeFunction:Function;
                  public var autoRemove:Boolean = false;
                  public var autoRelease:Boolean = false;
                  
  
                  public function @ax-actionscript-extra-fisheye-qs-controls-LayoutAnimator():void
                  {
                          _timer = new Timer(10);
                          _timer.addEventListener(TimerEvent.TIMER,timerHandler);                        
                          _targets = new Dictionary(true);
                  }
                  
                  
                  public function targetFor(child:IFlexDisplayObject):LayoutTarget
                  {
                          var result:LayoutTarget = _targets[child];
                          if(result == null)
                          {
                                  if(_oldTargets != null && child in _oldTargets)
                                  {
                                          result = _targets[child] = _oldTargets[child];
                                          delete _oldTargets[child];
                                  }
                                  else
                                  {
                                          result = _targets[child] = new LayoutTarget(child);
                                  }
                          }
                          return result;
                  }
                  
                  public function releaseTarget(child:IFlexDisplayObject):LayoutTarget
                  {
                          var target:LayoutTarget = _targets[child];
                          if(target == null && _oldTargets != null)
                                  target = _oldTargets[child];
  
                          if(target == null)
                                  return null;
                          return _releaseTarget(target);
                  }
                  
                  private function _releaseTarget(target:LayoutTarget):LayoutTarget
                  {
                          target.state = "removed";
                          if(target.releaseFunction != null)
                                  target.releaseFunction(target);
                          else if (releaseFunction != null)
                                  releaseFunction(target);
                          else
                          {
                                  target.x = target.x + target.unscaledWidth * target.scaleX/2;
                                  target.y = target.y + target.unscaledHeight * target.scaleY/2;
                                  target.scaleX = 0;
                                  target.scaleY = 0;
                          }
                          invalidateLayout();
                          return target;
                  }
                  
                  public function get animating():Boolean
                  {
                          return _timer.running;
                  }
                  public function set items(value:Object):void
                  {
                          _targets = new Dictionary(true);
                          if(value is Array)
                          {
                                  var items:Array = (value as Array);
                                  for(var i:int = 0;i < items.length;i++)
                                  {
                                          _targets[items[i]] = new LayoutTarget( items[i] );
                                  }
                          }
                          else if (value is DisplayObjectContainer)
                          {
                                  var parent:DisplayObjectContainer = DisplayObjectContainer(value);
                                  for(i = 0;i<parent.numChildren;i++)
                                  {
                                          _targets[parent.getChildAt(i)] = new LayoutTarget( IFlexDisplayObject(parent.getChildAt(i)) );
                                  }
                          }
                  }
                  
                  public function get targets():Dictionary
                  {
                          return _targets;
                  }
                  public function set animationSpeed(value:Number):void
                  {
                          _animationSpeed = (isNaN(value)?DEFAULT_ANIMATION_SPEED:value);
                  }
                  public function get animationSpeed():Number
                  {
                          return _animationSpeed;
                  }
                  
                  public function layout(updateNow:Boolean = false):void
                  {
                          _layoutInvalid = false;
                          startTimer();
                          if(updateNow)
                          {
                                  updateLayout();
                          }
                  }
                  public function invalidateLayout(updateNow:Boolean = false):void
                  {
                          _layoutInvalid = true;
                          startTimer();
                          if(updateNow)
                          {
                                  updateLayout();
                          }
                  }
                  private function startTimer():void
                  {
                          if(_timer.running == false)
                          {
                                  _timer.reset();
                                  _timer.start();
                                  running++;
                          }
                  }
                  private function stopTimer():void
                  {
                          if(_timer.running)
                          {
                                  running--;
                                  _timer.stop();
                          }
                  }
                  private function timerHandler(e:TimerEvent):void
                  {
                          updateLayout();
                          e.updateAfterEvent();
                  }
                  
                  private function invokeLayoutFunction():void
                  {
                          if(autoRelease)
                          {
                                  _oldTargets = _targets;
                                  _targets = new Dictionary(true);
                          }
                          layoutFunction();
                          if(autoRelease)
                          {
                                  var oldTargets:Dictionary = _oldTargets;
                                  _oldTargets = null;
                                  for(var aKey:* in oldTargets)
                                  {
                                          var target:LayoutTarget = oldTargets[aKey];
                                          _targets[aKey] = target;
                                          _releaseTarget(target);
                                  }
                          }
                  }
                  
                  public function updateLayoutWithoutAnimation():void
                  {
                          if(_layoutInvalid == true && layoutFunction != null)
                          {
                                  _layoutInvalid = false;
                                  invokeLayoutFunction();
                          }
  
                          for(var aChild:* in _targets)
                          {
                                  var target:LayoutTarget = _targets[aChild];
                                  var item:IFlexDisplayObject = target.item;
                                  var m:Matrix = DisplayObject(item).transform.matrix;
  
                                  m.tx = target.x;
                                  m.ty = target.y;
                                  m.a = target.scaleX;                                        
                                  m.d = target.scaleY
                                  
                                  DisplayObject(item).alpha = target.alpha;
                                  DisplayObject(item).transform.matrix = m;
                                  item.setActualSize(target.unscaledWidth,target.unscaledHeight);
                                  if(target.state == "removed")
                                  {
                                          delete _targets[target.item];
                                          if(removeFunction != null)
                                          {
                                                  removeFunction(target.item);
                                          }
                                          if(autoRemove)
                                          {
                                                  target.item.parent.removeChild(DisplayObject(target.item));                                                
                                          }
                                          continue;
                                  }
                                  else
                                  {
                                          target.state = "positioned"
                                  }
                          }
                          stopTimer();
                  }
                  
                  public function updateLayout():void
                  {
                          if(_layoutInvalid == true && layoutFunction != null)
                          {
                                  _layoutInvalid = false;
                                  invokeLayoutFunction();
                                  _priorityInvalid = true;
                          }
  
                          
                          var bNeedAnotherTimout:Boolean = false;
  
                          if(_priorityInvalid)
                          {
                                  _priorityInvalid = false;
                                  _orderedTargets = [];
                                  for(var aChild:* in _targets)
                                  {
                                          var target:LayoutTarget = _targets[aChild];
                                          if(autoPrioritize)
                                          {
                                                  target.priority =         (target.state == "removed")?         0:
                                                                                          (target.state == "added")?                 2:
                                                                                                                                                          1;
                                          }
                                          _orderedTargets.push(_targets[aChild]);
                                  }
                                  _orderedTargets.sortOn("priority",Array.NUMERIC | Array.DESCENDING);
                                  
                          }
                          
                          var activePriority:int = -1;
                          for(var i:int = _orderedTargets.length-1;i>=0;i--)
                          {
                                  target = _orderedTargets[i];
                                  var item:IFlexDisplayObject = target.item;
                                  var jumpToSize:Boolean = false;
                                  var m:Matrix = DisplayObject(item).transform.matrix;
                                  
                                  if(activePriority >= 0 && target.priority > activePriority)
                                          break;
                                  
                                  var prevWidth:Number = item.width;
                                  var prevHeight:Number = item.height;
                                                          
                                  if(target.state == "added")
                                  {
                                          bNeedAnotherTimout = true;
                                          if(target.initializeFunction != null)
                                          {
                                                  target.initializeFunction(target);
                                                  m = DisplayObject(item).transform.matrix;
                                                  prevWidth = item.width;
                                                  prevHeight = item.height;
                                          }
                                          else if (initializeFunction != null)
                                          {
                                                  initializeFunction(target);
                                                  m = DisplayObject(item).transform.matrix;
                                                  prevWidth = item.width;
                                                  prevHeight = item.height;
                                          }
                                          else
                                          {
                                                  m.tx  = target.x + target.scaleX*target.unscaledWidth/2;
                                                  m.ty  = target.y + target.scaleY*target.unscaledHeight/2;                                        
                                                  m.a = 0;
                                                  m.d = 0;
                                          }                                        
                                          activePriority = target.priority;
                                          target.state = "positioned";
                                  }
                                  else if(target.animate == false || 
                                          (Math.abs(m.tx - target.x) < TRANSLATE_TOLERANCE &&
                                          Math.abs(m.ty - target.y) < TRANSLATE_TOLERANCE &&
                                          Math.abs(m.a - target.scaleX) < SCALE_TOLERANCE &&
                                          Math.abs(m.d - target.scaleY) < SCALE_TOLERANCE &&
                                          Math.abs(item.width - target.unscaledWidth) < SIZE_TOLERANCE &&
                                          Math.abs(item.alpha - target.alpha) < ALPHA_TOLERANCE &&
                                          Math.abs(item.height - target.unscaledHeight) < SIZE_TOLERANCE
                                  ))
                                  {
                                          m.tx = target.x;
                                          m.ty = target.y;
                                          m.a = target.scaleX;                                        
                                          m.d = target.scaleY;
                                          item.alpha = target.alpha;
                                          item.setActualSize(target.unscaledWidth,target.unscaledHeight);
                                          jumpToSize = true;
                                          if(target.state == "removed")
                                          {
                                                  delete _targets[target.item];                
                                                  if(removeFunction != null)
                                                  {
                                                          removeFunction(target.item);
                                                  }
                                                  if(autoRemove)
                                                  {
                                                          target.item.parent.removeChild(DisplayObject(target.item));                                                
                                                  }
                                          }
                                          _orderedTargets.splice(i,1);                        
                                  }
                                  else
                                  {
                                          bNeedAnotherTimout = true;
                                          m.tx  += _animationSpeed*(target.x - m.tx);
                                          m.ty += _animationSpeed*(target.y - m.ty);
                                          m.a = m.a + _animationSpeed*(target.scaleX-m.a);
                                          m.d = m.d + _animationSpeed*(target.scaleY-m.d);
                                          item.alpha = item.alpha + _animationSpeed*(target.alpha-item.alpha);
                                          activePriority = target.priority;
                                  }
                                  DisplayObject(item).transform.matrix = m;
  
                                  if(jumpToSize)
                                  {
                                          item.setActualSize(target.unscaledWidth,target.unscaledHeight);
                                  }
                                  else if(prevWidth != target.unscaledWidth || prevHeight != target.unscaledHeight)
                                  {
                                          item.setActualSize(prevWidth + _animationSpeed*(target.unscaledWidth - prevWidth),
                                                                             prevHeight + _animationSpeed*(target.unscaledHeight - prevHeight));
                                  }
                          }
  
                          if(updateFunction != null)
                                  updateFunction();
                          if(bNeedAnotherTimout == false)
                                  stopTimer();
                  }
          }
  }