//scroller 自动滚动
 namespace web.layout.behavior.scroller;

namespace sinking {
	//鼠标以SINKING(捕获模式)向下传递下,使用sinking命名空间响应事件
	
	onMouseMove = function (ltTarget,ltOwner,x,y,mouseParams) {
		
		if( mouseParams.button_state )
			return false; // only mouse move in unpressed state.
		
		var scrollInfo = ltOwner.getScrollInfo(); 
		var pos = scrollInfo.pos;
		var rect =scrollInfo.rect;
		var size = scrollInfo.size
		
		if( x < rect.left || x > rect.right ||   y < rect.top || y > rect.bottom )
			return false;
		
		var vh = rect.bottom - rect.top;
		if( vh >= size.cy  )
			return false;
		
		var dh = size.cy - vh; 
		var py = ( y * dh) / vh;
		if( py != pos.y ) {
			pos.y = py; 
			ltOwner.setScrollPos(pos.x,pos.y,false);
		}
		return false; 
	}
}