Mouse Scrolling

//obj_controller step
if view_current == 0
    {
        x = mouse_x;
        y = mouse_y;
        if keyboard_check( vk_left )
        {
            view_xview -= 10;
        }
        if keyboard_check( vk_right )
        {
            view_xview += 10;
        }
        if keyboard_check( vk_up )
        {
            view_yview -= 10;
        }
        if keyboard_check( vk_down )
        {
           view_yview += 10;
        }
    }
//view[0]
view_wview[ 0 ] = 2000;
view_hview[ 0 ] = 2000;
view_object[ 0 ] = obj_controller;
view_hspeed[ 0 ] = 8;
view_vspeed[ 0 ] = 8;