コード例 #1
0
        /// <summary>
        /// Get the scroll position of a text box.
        /// </summary>
        public static unsafe Win32.POINT GetScrollPos(IntPtr handle)
        {
            Win32.POINT res = new Win32.POINT();
            IntPtr      ptr = new IntPtr(&res);

            Win32.SendMessage(handle, Win32.EM_GETSCROLLPOS, 0, ptr);
            return(res);
        }
コード例 #2
0
        /// <summary>
        /// Helper function for dealing with strange Windows behavior.
        /// When a text box is bigger than 65535 pixels, Windows applies some strange
        /// scaling to whatever value you pass in to SetScrollPos(). The same scaling
        /// is not applied to GetScrollPos(), meaning that if you set the scroll pos
        /// to the value you just received from GetScrollPos(), the position will
        /// actually jump.
        ///
        /// This function compensates for that by finding a value to send to SetScrollPos
        /// so that GetScrollPos() returns the value specified by point.
        /// </summary>
        public static void SetScrollPos(IntPtr handle, Win32.POINT point)
        {
            double t0 = -1, t1 = 0, y0 = -1, y1 = 0;
            int    iter_max = 100;

            while (iter_max-- > 0)
            {
                double t = (point.y - y0) / (y1 - y0) * (t1 - t0) + t0;
                SetScrollPosRaw(handle, new Win32.POINT(point.x, (int)t));
                Win32.POINT p    = GetScrollPos(handle);
                double      yres = p.y;
                if ((int)yres == point.y || (int)yres == y1 || (int)t == t1)
                {
                    break;
                }
                t0 = t1;
                y0 = y1;
                t1 = t;
                y1 = yres;
            }
        }
コード例 #3
0
        /// <summary>
        /// Set the scroll position of a text box.
        /// </summary>
        public static unsafe void SetScrollPosRaw(IntPtr handle, Win32.POINT point)
        {
            IntPtr ptr = new IntPtr(&point);

            Win32.SendMessage(handle, Win32.EM_SETSCROLLPOS, 0, ptr);
        }