/*
双向(横板+竖版)滚动条
Copyright (c) 2009, www.brandsh.cn, qq:657173348
All rights reserved.
*/
package
{
import flash.display.*;
import flash.events.*;
import flash.geom.Point;
import flash.geom.Rectangle;
import flash.utils.Timer;
public class ScrollBar
{
public static const H = "H";
public static const L = "L";
public const name = "滚动条窗口";
private var _speed:Number = 15;
private var _upBtn:Sprite;
private var _downBtn:Sprite;
private var _tween:Number;
private var _elastic:Boolean;
private var _lineAbleClick:Boolean;
private var _mouseWheel:Boolean;
private var _direction:String;
private var _scale9Grid:Rectangle;
private var _target:DisplayObject;
private var _maskTarget:DisplayObject;
private var _scrollBar:Sprite;
private var _scrollLine:Sprite;
private var _timer:Timer = null;
private var _scrollBarOriginalPoint:Point;
private var _parentMC:DisplayObjectContainer;
private var _rectangle:Rectangle;
private var _distanceX:Number;
private var _distanceY:Number;
private var _targetPoint:Number = NaN;
private var _coor:String;
private var _length:String;
private var _mouse:String;
private var _oldLength:Point;
private var _abled = true;
public function set tween($value:Number):void
{
_tween = $value < 1||$value > 20?1:$value;
}
public function set elastic($value:Boolean):void
{
_elastic = $value ;
if (_abled)
makeScrollBar();
}
public function set lineAbleClick($value:Boolean):void
{
_lineAbleClick = $value ;
if (_lineAbleClick)
_scrollLine.addEventListener(MouseEvent.MOUSE_DOWN, scrollLineMouseDownHandler, false, 0, true );
else
_scrollLine.removeEventListener(MouseEvent.MOUSE_DOWN, scrollLineMouseDownHandler);
}
public function set mouseWheel($value:Boolean):void
{
_mouseWheel = $value ;
if (_mouseWheel && _abled)
_parentMC.stage.addEventListener(MouseEvent.MOUSE_WHEEL, mouseWheelHandler, false, 0, true );
else if(_abled)
_parentMC.stage.removeEventListener(MouseEvent.MOUSE_WHEEL, mouseWheelHandler);
}
public function set direction($value:String):void
{
_direction = $value ;
_coor = _direction == "H"?"x":"y";
_length = _coor == "x"?"width":"height";
_mouse = _coor == "x"?"mouseX":"mouseY";
if (_abled)
makeScrollBar();
}
public function set scale9Grid($value:Rectangle):void
{
_scale9Grid = $value ;
try { _scrollBar.scale9Grid = _scale9Grid } catch (e) { _scrollBar.scale9Grid = null }
}
public function set speed($value:Number):void
{
_speed = $value<5||$value>35?15:$value;
}
public function set UP($target:Sprite):void
{
_upBtn = $target;
if (!_abled)
{
_upBtn.visible = false;
_upBtn.removeEventListener(MouseEvent.MOUSE_DOWN, upDownBtnMouseDownHandler );
return;
}
_upBtn.addEventListener(MouseEvent.MOUSE_DOWN, upDownBtnMouseDownHandler, false, 0, true );
}
public function set DOWN($target:Sprite):void
{
_downBtn = $target;
if (!_abled)
{
_downBtn.visible = false;
_downBtn.removeEventListener(MouseEvent.MOUSE_DOWN, upDownBtnMouseDownHandler );
return;
}
_downBtn.addEventListener(MouseEvent.MOUSE_DOWN, upDownBtnMouseDownHandler, false, 0, true );
}
/**
* 双向(横板+竖版)滚动条
* @param $target DisplayObjectContainer * 被遮罩对象
* @param $maskTarget * * 遮罩对象(可传入Rectangle类型)
* @param $scrollBar Sprite * 滚动滑块
* @param $scrollLine Sprite * 滚动条
* @param $tween Number * 缓动系数
* @param $elastic Boolean * 滑块可否拉伸
* @param $lineAbleClick Boolean * 滚动条可否点击
* @param $mouseWheel Boolean * 滚轮可用
* @param $direction String * 方向(默认纵向)
*/
public function ScrollBar($target:DisplayObjectContainer, $maskTarget:*, $scrollBar:Sprite, $scrollLine:Sprite, $tween:Number = 0, $elastic:Boolean = true, $lineAbleClick:Boolean = false, $mouseWheel:Boolean = true, $direction:String = "L")
{
if (!(($maskTarget is DisplayObject) || ($maskTarget is Rectangle))) throw(new Error("没有传入遮罩对象"));
_target = $target;
_maskTarget = $maskTarget is Rectangle?drawMaskTarget($maskTarget):$maskTarget;
_scrollBar = $scrollBar;
_scrollLine = $scrollLine;
_tween = $tween < 1||$tween > 20?1:$tween;
_elastic = $elastic;
_lineAbleClick = $lineAbleClick;
_mouseWheel = $mouseWheel;
_direction = $direction;
_parentMC = _scrollBar.parent;
_coor = $direction == "H"?"x":"y";
_length = _coor == "x"?"width":"height";
_mouse = _coor == "x"?"mouseX":"mouseY";
_oldLength = new Point(_scrollBar.width, _scrollBar.height);
_scale9Grid = new Rectangle(_scrollBar.width / 3, _scrollBar.height / 3, _scrollBar.width / 3, _scrollBar.height / 3);
makeScrollPane();
}
/**
* 刷新UI
*/
public function refresh():void
{
checkAbled();
}
private function makeScrollPane():void
{
initAllThing();
_scrollBarOriginalPoint = new Point(_scrollBar.x, _scrollBar.y);
makeMask();
checkAbled();
}
//检查可用性
private function checkAbled():void
{
if (_maskTarget[_length] >= _target[_length])
{
_scrollBar.visible = false;
_scrollLine.visible = false;
if (_downBtn)_downBtn.visible = false;
if (_upBtn)_upBtn.visible = false;
_abled = false;
if (_upBtn&&_downBtn) {
_upBtn.removeEventListener(MouseEvent.MOUSE_DOWN, upDownBtnMouseDownHandler );
_downBtn.removeEventListener(MouseEvent.MOUSE_DOWN, upDownBtnMouseDownHandler );
}
if (_mouseWheel) makeMouseWheel("stop");
}else
{
_scrollBar.visible = true;
_scrollLine.visible = true;
if (_downBtn)_downBtn.visible = true;
if (_upBtn)_upBtn.visible = true;
_abled = true;
makeScrollBar();
if (_upBtn&&_downBtn) {
_upBtn.addEventListener(MouseEvent.MOUSE_DOWN, upDownBtnMouseDownHandler, false, 0, true );
_downBtn.addEventListener(MouseEvent.MOUSE_DOWN, upDownBtnMouseDownHandler, false, 0, true );
}
if (_lineAbleClick) makeScrollLine();
if (_mouseWheel) makeMouseWheel();
timeListener();
}
}
//timer检测器
private function timeListener():void
{
if (_timer != null) return;
_timer = new Timer(1000 / 30, 0);
_timer.addEventListener(TimerEvent.TIMER, timeHandler, false, 0, true );
_timer.start();
}
//注册点
private function initAllThing():void
{
setRegistration(_maskTarget as DisplayObjectContainer);
setRegistration(_target as DisplayObjectContainer);
setRegistration(_scrollLine);
setRegistration(_scrollBar);
}
//初始化遮罩
private function makeMask():void
{
_target.x = Math.floor(_target.x); //防止文字模糊
_target.y = Math.floor(_target.y);
_maskTarget.x = _target.x;
_maskTarget.y = _target.y;
if (_maskTarget.parent == null)_parentMC.addChild(_maskTarget);
_target.mask = _maskTarget;
}
//背景条
private function makeScrollLine():void
{
_scrollLine.buttonMode = false;
_scrollLine.addEventListener(MouseEvent.MOUSE_DOWN, scrollLineMouseDownHandler, false, 0, true );
}
//滚轮
private function makeMouseWheel(state:String = "start" ):void
{
if(state=="start")
_parentMC.stage.addEventListener(MouseEvent.MOUSE_WHEEL, mouseWheelHandler, false, 0, true );
else if (state == "stop")
_parentMC.stage.removeEventListener(MouseEvent.MOUSE_WHEEL, mouseWheelHandler);
}
//滑块
private function makeScrollBar():void
{
_scrollBar.buttonMode = true;
_scrollBar.mouseChildren = false;
scrollBarLength(); //计算滑块长度
if (_coor == "y")
_rectangle = new Rectangle(_scrollBarOriginalPoint.x, _scrollBarOriginalPoint.y, 0, _scrollLine.getRect(_parentMC)[_length] - _scrollBar.getRect(_parentMC)[_length]);
else
_rectangle = new Rectangle(_scrollBarOriginalPoint.x, _scrollBarOriginalPoint.y, _scrollLine.getRect(_parentMC)[_length] - _scrollBar.getRect(_parentMC)[_length], 0);
_scrollBar.addEventListener(MouseEvent.MOUSE_DOWN, scrollBarMouseDownHandler, false, 0, true );
_scrollBar.addEventListener(MouseEvent.MOUSE_UP, scrollBarMouseUpHandler, false, 0, true );
_scrollBar.parent.stage.addEventListener(MouseEvent.MOUSE_UP, scrollBarMouseUpHandler, false, 0, true );
_scrollBar.root.stage.addEventListener(Event.MOUSE_LEAVE, scrollBarMouseUpHandler, false, 0, true );
}
//计算滑块长度
private function scrollBarLength():void
{
if (_elastic)
try { _scrollBar.scale9Grid = _scale9Grid } catch (e) { _scrollBar.scale9Grid = null }
else
_scrollBar.scale9Grid = null;
_scrollBar.width = _oldLength.x;
_scrollBar.height = _oldLength.y;
_scrollBar[_length] = _elastic ? _scrollLine[_length] * _maskTarget[_length] / _target[_length] : _oldLength[_coor];
}
private function scrollBarMouseDownHandler(e:MouseEvent):void
{
_distanceX = _scrollBar.x - _parentMC.mouseX;
_distanceY = _scrollBar.y - _parentMC.mouseY;
_scrollBar.addEventListener(Event.ENTER_FRAME, scrolBarEnterFrameHandler, false, 0, true );
}
private function scrollBarMouseUpHandler(e:*):void
{
_scrollBar.removeEventListener(Event.ENTER_FRAME, scrolBarEnterFrameHandler);
}
private function scrolBarEnterFrameHandler(e:Event):void
{
makeDragBar();
}
private function timeHandler(e:TimerEvent):void
{
scrollMachine();
}
//滚动条点击
private function scrollLineMouseDownHandler(e:MouseEvent):void
{
if (_parentMC[_mouse] > _scrollBar[_coor])
_scrollBar[_coor] += 3*_speed;
else
_scrollBar[_coor] -= 3*_speed;
judgeBoundary();
}
//上下按钮点击
private function upDownBtnMouseDownHandler(e:MouseEvent):void
{
if (e.currentTarget == _downBtn)
_scrollBar[_coor] += 3*_speed;
else
_scrollBar[_coor] -= 3 * _speed;
judgeBoundary();
}
//鼠标滚轮
private function mouseWheelHandler(e:MouseEvent):void
{
if (e.delta < 0)
_scrollBar[_coor] += _speed;
else
_scrollBar[_coor] -= _speed;
judgeBoundary();
}
//拖动滑块
private function makeDragBar():void
{
_scrollBar.x = _parentMC.mouseX + _distanceX;
_scrollBar.y = _parentMC.mouseY + _distanceY;
judgeBoundary();
}
//判断边界
private function judgeBoundary() :void
{
if (_scrollBar.x < _rectangle.x)
_scrollBar.x = _rectangle.x;
if (_scrollBar.x > _rectangle.right)
_scrollBar.x = _rectangle.right;
if (_scrollBar.y < _rectangle.y )
_scrollBar.y = _rectangle.y;
if (_scrollBar.y > _rectangle.bottom)
_scrollBar.y = _rectangle.bottom;
}
//滚动计算公式
private function scrollMachine():void
{
_targetPoint = _maskTarget[_coor] - (_scrollBar[_coor] - _scrollBarOriginalPoint[_coor]) * (_target[_length] - _maskTarget[_length]) / (_scrollLine[_length] - _scrollBar[_length]);
if (Math.abs(_target[_coor] - _targetPoint) < .3)
{
if (_target[_coor] != _targetPoint) _target[_coor] = _targetPoint;
return;
}
if (_tween != 0)
_target[_coor] += (_targetPoint - _target[_coor]) / _tween;
else
_target[_coor] = _targetPoint;
}
//绘制遮罩
private function drawMaskTarget($rect:Rectangle):Sprite
{
var maskTarget:Sprite = new Sprite();
maskTarget.graphics.beginFill(0xffffff);
maskTarget.graphics.drawRect($rect.x, $rect.y, $rect.width, $rect.height);
maskTarget.graphics.endFill();
return maskTarget;
}
//注册点移到左上角
private function setRegistration($target:DisplayObjectContainer):void
{
var rect = $target.getRect($target);
var _x = rect.x;
var _y = rect.y;
var depth:Number = $target.numChildren;
if (depth == 0) return;
for (var i:uint = 0; i < depth; i++ )
{
var target:DisplayObject = $target.getChildAt(i);
target.x -= _x;
target.y -= _y;
}
if ($target.parent != null)
{
$target.x += _x;
$target.y += _y;
}
}
}
}
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