How do you limit scrolling?

[thenewa2x]

I've wrote a listener to scroll a window that has been masked. So far I have come up with this:

// Attach mouse wheel scroll listeners.
_global.mWheel = new Object ( );
        mWheel.onMouseWheel = function ( delta:Number )
		{
			// Recalculate delta.
			delta *= 3;
			
			// Shift being held down?
			if ( Key.getCode( ) == 16 )
			{
				// Speed up more.
				delta *= 2;
			}
			
			// Get new position.
			newPos = _root.catpg._y + delta;
			
			// Scrolling Down?
			if ( newPos < _root.catpg._y )
			{
				// Reached end of page?
				if ( ( _root.catpg._height - newPos ) )
					;
				trace( _root.catpg._height - newPos );
			}
			
			// Scrolling up?
			else
			{
			}
			
			_root.catpg._y = newPos;
		}
Mouse.addListener( _global.mWheel );

The scrolling and scrolling acceleration (16 = Shift) works but I don't know how to limit it. I want to prevent it from scrolling beyond the beginning and ending of the clip that was masked. Please let me know if I missed any information I should have provided.

Thanks.

---------------------------------------
TINSTAAFL, which is why I contribute.

 

[thenewa2x]

Just FYI, the height of the content box is dynamic, it changes depending on the contents. The mask size is constant however, it is height: 290, width: 549 and it is called [tt]_root.maskCat[/tt].

---------------------------------------
TINSTAAFL, which is why I contribute.

 

[thenewa2x]

Well I figured out how to prevent it from going too far up.

// Attach mouse wheel scroll listeners.
_global.mWheel = new Object ( );
        mWheel.onMouseWheel = function ( delta:Number )
		{
			// Recalculate delta.
			delta *= 3;
			
			// Shift being held down?
			if ( Key.getCode( ) == 16 )
			{
				// Speed up more.
				delta *= 2;
			}
			
			// Get new position.
			newPos = _root.catpg._y + delta;
			
			// Scrolling Down?
			if ( newPos < _root.catpg._y )
			{
				// Too low?
				if ( ( Math.abs( newPos ) + _global.defaultY ) > _root.catpg._height )
				{
					//
				}
			}
			
			// Scrolling up?
			else
			{
				// Too high up?
				if ( newPos > _global.defaultY )
					newPos = _global.defaultY;
			}
			
			_root.catpg._y = newPos;
		}
Mouse.addListener( _global.mWheel );

Now I just need to know how to prevent it from scrolling down too far.

---------------------------------------
TINSTAAFL, which is why I contribute.

 

[thenewa2x]

Ok, nvm. I think I figured it out. Now I just have to fix another glitch...

Heh.

---------------------------------------
TINSTAAFL, which is why I contribute.