(function( $ ){
    

$.ControlAnchor = {
    NONE: 0,
    TOP_LEFT: 1,
    TOP_RIGHT: 2,
    BOTTOM_RIGHT: 3,
    BOTTOM_LEFT: 4
};

$.Control = function ( elmt, anchor, container ) {
    this.elmt       = elmt;
    this.anchor     = anchor;
    this.container  = container;
    this.wrapper    = $.makeNeutralElement( "span" );
    this.wrapper.style.display = "inline-block";
    this.wrapper.appendChild( this.elmt );

    if ( this.anchor == $.ControlAnchor.NONE ) {
        // IE6 fix
        this.wrapper.style.width = this.wrapper.style.height = "100%";    
    }

    if ( this.anchor == $.ControlAnchor.TOP_RIGHT || 
         this.anchor == $.ControlAnchor.BOTTOM_RIGHT ) {
        this.container.insertBefore( 
            this.wrapper, 
            this.container.firstChild 
        );
    } else {
        this.container.appendChild( this.wrapper );
    }
};

$.Control.prototype = {

    destroy: function() {
        this.wrapper.removeChild( this.elmt );
        this.container.removeChild( this.wrapper );
    },

    isVisible: function() {
        return this.wrapper.style.display != "none";
    },

    setVisible: function( visible ) {
        this.wrapper.style.display = visible ? 
            "inline-block" : 
            "none";
    },

    setOpacity: function( opacity ) {
        if ( this.elmt[ $.SIGNAL ] && $.Browser.vendor == $.BROWSERS.IE ) {
            $.setElementOpacity( this.elmt, opacity, true );
        } else {
            $.setElementOpacity( this.wrapper, opacity, true );
        }
    }
};

}( OpenSeadragon ));