I don't use the this - word because of the nested functions ans possible
complications with the this pointiong to the prototype movieclip
In terms of scope for the nested function, is this the way to go ?
I just paste my proto,
cheers,
Latcho
MovieClip.prototype.addScroll=function (X,Y,H,mask_mc){
/*
//scrollBar will be added to the _parent of the scrolling window
(because that one is masked)
//mask_mc always has to be on x:0 and y:0 off the content-clip (this)
//X & Y =position relative to the scrollinng content (this) clip's pos
//H= Scrollbar's total height
//mask-mc the mc that masks the content (this)
//assets to bind are 1 attachable clib with linkage 'scrollBarAssets'
//scrollBarAssets - mc should contain a 'scroll_top' / 'scroll_bot'
/ 'scroll_track' all with reference pint 0,0
//also a 'scroll_grip' with reference point *in the middle* !
*/
var contentScrollSpeed=3.75
var gripSpeed=3 // pixels the grip moves when we press the buttons
of the scrollbar
var scrollBarAssets_linkage="scrollBarAssets"
var content_mc=this
var __X= this._x+X
var __Y= this._y+Y
var __H= H
var
scrollBar=this._parent.attachMovie(scrollBarAssets_linkage,this._name+"ScrollBar",this._parent.getNextHighestDepth(),{_x:__X,_y:__Y})
var sb=scrollBar
var grip=sb.scroll_grip
var halfGrip=grip._height/2
sb.diffHeight=Math.max((this._height-mask_mc._height),0)
sb.contentHomePos_y=content_mc._y
sb.scroll_top._x=0
sb.scroll_top._y=0
sb.scroll_track._x=0
sb.scroll_track._y=sb.scroll_top._height
sb.scroll_track._height=__H-sb.scroll_top._height-sb.scroll_bot._height
grip._x=sb.scroll_track._width/2
sb.scroll_grip._y=sb.scroll_top._height+halfGrip
sb.scroll_bot._x=sb.scroll_top._x
sb.scroll_bot._y=__H-sb.scroll_bot._height
sb.bounds=new
Object({left:grip._x,top:grip._y,right:grip._x,bottom:sb.scroll_bot._y-halfGrip})
sb.gripHomePos_y=grip._y
sb.gripMaxMove_px=__H-sb.scroll_top._height-sb.scroll_bot._height-grip._height
grip.onPress=function(){sb.dragStart()}
grip.onReleaseOutside=sb.scroll_grip.onRelease=function(){sb.dragStop()}
sb.setContentYPos=function(px){
gripToPercent=(1-((sb.diffHeight-px)/sb.diffHeight))
gripToY=sb.gripHomePos_y+((sb.gripMaxMove_px)*gripToPercent)
grip._y=Math.min(sb.gripHomePos_y+sb.gripMaxMove_px,gripToY)
sb.dragStart()
sb.dragStop()
}
sb.dragStart=function(){
startDrag(grip, true,
sb.bounds.left,sb.bounds.top,sb.bounds.right,sb.bounds.bottom);
sb.isDragging=true
sb.onEnterFrame=function(){
sb.gripPercent=((grip._y-sb.gripHomePos_y)/(sb.gripMaxMove_px))*100
sb.contentNewPos_y=Math.round(sb.contentHomePos_y-(sb.diffHeight*sb.gripPercent)/100)
sb.diff=content_mc._y-sb.contentNewPos_y
sb.step=sb.diff/contentScrollSpeed
content_mc._y-=sb.step
if(sb.contentNewPos_y==Math.round(content_mc._y)&&sb.isDragging==false){
delete this.onEnterFrame
content_mc._y=Math.round(content_mc._y)
}
}
}
sb.dragStop=function(){
this.scroll_grip.stopDrag();
sb.isDragging=false
}
sb.scroll_bot.onPress=function(){
delete sb.scroll_top.onEnterFrame
sb.scroll_bot.onEnterFrame=function(){
sb.gripNewPos=grip._y+gripSpeed
if(sb.gripNewPos<=sb.gripHomePos_y+sb.gripMaxMove_px){
grip._y=Math.round(sb.gripNewPos)
sb.dragStart()
sb.dragStop()
}else{
grip._y=sb.gripHomePos_y+sb.gripMaxMove_px
delete sb.scroll_bot.onEnterFrame
}
sb.dragStart()
sb.dragStop()
}
}
sb.scroll_bot.onRelease=sb.scroll_bot.onReleaseOutside=function(){
delete this.onEnterFrame
}
sb.scroll_top.onPress=function(){
delete sb.scroll_bot.onEnterFrame
sb.scroll_top.onEnterFrame=function(){
newPos=grip._y-gripSpeed
if(newPos>sb.gripHomePos_y){
grip._y=Math.round(newPos)
sb.dragStart()
sb.dragStop()
}else{
grip._y=sb.gripHomePos_y
delete sb.scroll_top.onEnterFrame
}
sb.dragStart()
sb.dragStop()
}
}
sb.scroll_top.onRelease=sb.scroll_top.onReleaseOutside=function(){
delete sb.scroll_top.onEnterFrame
}
return scrollBar;
}
ASSetPropFlags(MovieClip.prototype, "addScroll", 7)
--
Hartelijke Groet,
Stijn De Ryck
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