package com.fylibs.components.effects
{
import flash.display.DisplayObject;
import flash.events.Event;
import flash.events.MouseEvent; /**
* 用于拖动对象时的缓动效果
* @author Frost.Yen
* @E-mail 871979853@qq.com
* @create 2015-12-11 下午3:22:27
*
*/
public class DragMove
{
private var _direction:String = "horizontal";
private var _ratio:Number = 0.900000;
/**
* 按下的坐标（当horizontal时为x坐标，当vertical时为y坐标）
*/
private var _downCoor:Number;
/**
* 移动的坐标（当horizontal时为x坐标，当vertical时为y坐标）
*/
private var _moveCoor:Number;
/**
* 缓动偏移量
*/
private var _offset:Number;
/**
* 坐标标记（当horizontal时为x，当vertical时为y）
*/
private var _coor:String = "mouseX";
/**
* 标记是否按下状态
*/
private var _isDown:Boolean;
private var _target:DisplayObject;
private var _max:Number;
private var _min:Number;
/**
* 拖拽缓动
* @param target 需要拖拽的对象
* @param max 拖拽对象的最大坐标值
* @param min 拖拽对象的最小坐标值
* @param direction 缓动方向
*/
public function DragMove(target:DisplayObject,max:Number,min:Number,direction:String="horizontal")
{
_max = max;
_min = min;
_direction = direction;
_direction == "horizontal"?_coor = "mouseX":_coor = "mouseY";
_target = target;
_target.addEventListener(MouseEvent.MOUSE_DOWN,onDown);
}
/**
* 刷新
* @param max 拖拽对象的最大坐标值
* @param min 拖拽对象的最小坐标值
*/
public function refresh(max:Number,min:Number):void
{
_max = max;
_min = min;
}
private function onDown(e:MouseEvent):void
{
_isDown = true;
_downCoor = _target[_coor];
_target.stage.addEventListener(MouseEvent.MOUSE_MOVE, onMove);
_target.stage.addEventListener(MouseEvent.MOUSE_UP, onUp);
_target.addEventListener(Event.ENTER_FRAME,onEnterFrame);
}
private function onEnterFrame(e:Event):void
{
_offset = _offset * _ratio;
_target.x = _target.x + _offset;
if (_target.x < _min){
_target.x = _min ;
}
if (_target.x > _max){
_target.x = _max;
}
if(Math.abs(_offset)<0.001){
_offset+=0.1;
_target.removeEventListener(Event.ENTER_FRAME,onEnterFrame);
}
}
private function onMove(e:MouseEvent):void
{
if (_isDown) {
_moveCoor = _target[_coor];
_offset = _moveCoor - _downCoor
_offset = _offset / 20;
}
}
private function onUp(e:MouseEvent):void
{
_isDown = false;
_target.stage.removeEventListener(MouseEvent.MOUSE_UP, onUp);
_target.stage.removeEventListener(MouseEvent.MOUSE_MOVE, onMove); }
/**
* 移动方向，horizontal横向，vertical纵向
*/
public function get direction():String
{
return _direction;
} /**
* @private
*/
public function set direction(value:String):void
{
_direction = value;
} /**
* 缓动系数
*/
public function get ratio():Number
{
return _ratio;
} /**
* @private
*/
public function set ratio(value:Number):void
{
_ratio = value;
} }
}