[AS3]as3压缩位图BitmapData.encode用法源代码示例(4)

ScrollBar.as  

package com.vini123.tool 
{ 
    import flash.display.Sprite; 
    import flash.events.Event; 
    import flash.events.MouseEvent; 
    import flash.geom.Rectangle; 
 
    public class ScrollBar extends Sprite 
    { 
        private var _upBtn:UpBtn; 
        private var _downBtn:DownBtn; 
        private var _lineBar:LineBar; 
        private var _dragBar:DragBar; 
        private var _gap:int = 2; 
        private var _rec:Rectangle; 
 
        private var _dirction:int; 
        private var _scrollTarget:*; 
        private var _barWidth:Number; 
        private var _lineColor:int; 
        private var _visible:Boolean = false; 
 
        public function ScrollBar():void 
        { 
            addEventListener(Event.ADDED_TO_STAGE,addToStageHandler); 
        } 
 
        private function addToStageHandler(e:Event):void 
        { 
            removeEventListener(Event.ADDED_TO_STAGE,addToStageHandler); 
            _upBtn = new UpBtn(); 
            _downBtn = new DownBtn(); 
            _lineBar = new LineBar(); 
            _dragBar = new DragBar(); 
            addChild(_upBtn); 
            addChild(_downBtn); 
            addChild(_lineBar); 
            addChild(_dragBar); 
            _dragBar.addEventListener(MouseEvent.MOUSE_DOWN,mouseDownHandler); 
            _dragBar.addEventListener(MouseEvent.MOUSE_UP,mouseUpHandler); 
            stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler); 
            stage.addEventListener(MouseEvent.MOUSE_WHEEL,mouseWheelHandler); 
 
            _downBtn.addEventListener(MouseEvent.CLICK,clickHandler); 
            _upBtn.addEventListener(MouseEvent.CLICK,clickHandler); 
        } 
 
        private function mouseWheelHandler(e:MouseEvent):void 
        { 
            var _distance:Number = e.delta * 3; 
            _dragBar.y +=  _distance; 
            updateDragBarPosition(); 
        } 
 
 
        private function clickHandler(e:MouseEvent):void 
        { 
            var _distance:Number; 
            _distance = _lineBar.height * 0.2; 
            switch (e.target) 
            { 
                case _downBtn : 
                    _dragBar.y -=  _distance; 
                    break; 
                case _upBtn : 
                    _dragBar.y +=  _distance; 
                    break; 
            } 
            updateDragBarPosition(); 
        } 
 
        private function updateDragBarPosition():void 
        { 
            if (_dragBar.y <= _lineBar.y) 
            { 
                _dragBar.y = _lineBar.y; 
            } 
            else if (_dragBar.y >= (_lineBar.y + _lineBar.height - _dragBar.height)) 
            { 
                _dragBar.y = (_lineBar.y + _lineBar.height - _dragBar.height); 
            } 
            enterHandler(); 
        } 
 
        private function mouseDownHandler(e:MouseEvent):void 
        { 
            _dragBar.startDrag(false,_rec); 
            useHandler(); 
        } 
 
        private function mouseUpHandler(e:MouseEvent):void 
        { 
            _dragBar.stopDrag(); 
            noHandler(); 
        } 
 
        private function updateBar():void 
        { 
            _upBtn.y = 0; 
            _lineBar.y = _upBtn.y + _upBtn.height + _gap; 
            _downBtn.y = _lineBar.y + _lineBar.height + _gap; 
            _dragBar.x = 1; 
            _dragBar.y = _lineBar.y; 
            _rec = new Rectangle(_dragBar.x,_lineBar.y,0,(_lineBar.height - _dragBar.height)); 
        } 
 
        /** 
         *  设置拖动条的属性  
         * @param _length  拖动条的总长度（竖向就是总高度，横向的就是总宽度） 
         * @param _width   拖动条的宽度 （指的是上下两个按钮的宽度和高度） 
         * @param _lineColor 拖动条的线条颜色 
         * @param _fillColor 拖动条的填充颜色 
         * @param _triangleColor 上下两个按钮里边三角形的填充颜色 
         * @param _dirction 表示拖动条的方向，值为0的时候是竖向，为1的时候是横向 
         * @param _visible 表示当被拖动对象小于或等于拖动条的长度时，是否显示拖动条。 
         *  
         */ 
        public function setSize(_length:Number,_width:Number,_lineColor:int,_fillColor:int,_triangleColor:int,_dirction:int,_visible:Boolean = false):void 
        { 
            this._dirction = _dirction; 
            _upBtn.beginDraw(_width,_lineColor,_fillColor,_triangleColor); 
            _downBtn.beginDraw(_width,_lineColor,_fillColor,_triangleColor); 
            _dragBar.beginDraw(_width,(_length - _upBtn.height - _downBtn.height -_gap *2)*0.5,_lineColor); 
            _lineBar.beginDraw(_width,(_length - _upBtn.height - _downBtn.height -_gap *2),_lineColor,_fillColor); 
             
            this._barWidth = _width; 
            this._lineColor = _lineColor; 
            this._visible = _visible; 
            updateBar(); 
        } 
 
        /** 
         *设置被拖动的对象  
         * @param value 
         *  
         */ 
        public function set scrollTarget(value:*):void 
        { 
            _scrollTarget = value; 
            var _h1:Number = this.height > _scrollTarget.height ? _lineBar.height :(this.height / _scrollTarget.height) *_lineBar.height; 
            _h1_h1 = _h1 < 30 ? 30:_h1; 
            _dragBar.beginDraw(_barWidth,_h1,_lineColor); 
            _rec = new Rectangle(_dragBar.x,_lineBar.y,0,(_lineBar.height - _dragBar.height)); 
            enterHandler(); 
        } 
 
        private function enterHandler(e:Event = null):void 
        { 
            if (_lineBar.height == _dragBar.height) 
            { 
                if (! _visible) 
                { 
                    this.visible = false; 
                } 
                _scrollTarget.y = this.y; 
            } 
            else 
            { 
                this.visible = true; 
                _scrollTarget.y = this.y + (_dragBar.y - _lineBar.y) * (this.height - _scrollTarget.height)/(_lineBar.height - _dragBar.height); 
            } 
        } 
 
        private function useHandler():void 
        { 
            addEventListener(Event.ENTER_FRAME,enterHandler); 
        } 
 
        private function noHandler():void 
        { 
            removeEventListener(Event.ENTER_FRAME,enterHandler); 
        } 
    } 
} 
 
import flash.display.Shape; 
import flash.display.Sprite; 
 
class UpBtn extends Sprite 
{ 
    private var _rect:Shape; 
    private var _triangle:Shape; 
    public function UpBtn():void 
    { 
        _rect = new Shape(); 
        _triangle = new Shape(); 
        addChild(_rect); 
        addChild(_triangle); 
    } 
 
    public function beginDraw(_h:Number,_lineColor:int,_fillColor:int,_triangleColor:int):void 
    { 
        _rect.graphics.clear(); 
        _rect.graphics.lineStyle(1,_lineColor); 
        _rect.graphics.beginFill(_fillColor,1); 
        _rect.graphics.drawRect(0,0,_h,_h); 
        _rect.graphics.endFill(); 
 
        _triangle.graphics.clear(); 
        _triangle.graphics.lineStyle(1,_triangleColor); 
        _triangle.graphics.beginFill(_triangleColor,1); 
 
        _triangle.graphics.moveTo(_h/3,0); 
        _triangle.graphics.lineTo(2*_h/3,_h/2.5); 
        _triangle.graphics.lineTo(0,_h/2.5); 
        _triangle.graphics.lineTo(_h/3,0); 
 
        _triangle.x = _rect.width * 0.5 - _triangle.width * 0.5; 
        _triangle.y = _rect.height * 0.5 - _triangle.height * 0.5; 
    } 
} 
 
class DownBtn extends Sprite 
{ 
    private var _rect:Shape; 
    private var _triangle:Shape; 
 
    public function DownBtn():void 
    { 
        _rect = new Shape(); 
        _triangle = new Shape(); 
        addChild(_rect); 
        addChild(_triangle); 
    } 
 
    public function beginDraw(_h:int,_lineColor:int,_fillColor:int,_triangleColor:int):void 
    { 
        _rect.graphics.clear(); 
        _rect.graphics.lineStyle(1,_lineColor); 
        _rect.graphics.beginFill(_fillColor,1); 
        _rect.graphics.drawRect(0,0,_h,_h); 
        _rect.graphics.endFill(); 
 
        _triangle.graphics.clear(); 
        _triangle.graphics.lineStyle(1,_triangleColor); 
        _triangle.graphics.beginFill(_triangleColor,1); 
        _triangle.graphics.moveTo(0,0); 
        _triangle.graphics.lineTo(2*_h/3,0); 
        _triangle.graphics.lineTo(_h/3,_h/2.5); 
        _triangle.graphics.lineTo(0,0); 
 
        _triangle.x = _rect.width * 0.5 - _triangle.width * 0.5; 
        _triangle.y = _rect.height * 0.5 - _triangle.height * 0.5; 
    } 
} 
 
class LineBar extends Sprite 
{ 
 
    private var _rect:Shape; 
    public function LineBar():void 
    { 
        _rect = new Shape(); 
        addChild(_rect); 
    } 
 
    public function beginDraw(_w:int,_h:int,_lineColor:int,_fillColor:int):void 
    { 
        _rect.graphics.clear(); 
        _rect.graphics.lineStyle(1,_lineColor); 
        _rect.graphics.beginFill(_fillColor,1); 
        _rect.graphics.drawRect(0,0,_w,_h); 
        _rect.graphics.endFill(); 
    } 
} 
 
class DragBar extends Sprite 
{ 
    private var _rect:Shape; 
    public function DragBar():void 
    { 
        _rect = new Shape(); 
        addChild(_rect); 
        beginDraw(15,100,0xFFF8E9); 
    } 
 
    public function beginDraw(_w:int,_h:int,_fillColor:int):void 
    { 
        _rect.graphics.clear(); 
        _rect.graphics.beginFill(_fillColor,1); 
        _rect.graphics.drawRect(0,0,(_w-1),_h); 
        _rect.graphics.endFill(); 
    } 
}