Controlling the location of the soft input panel in NETCF

/// <summary>
/// Shows the input panel relative to the given control.
/// </summary>
/// <param name="control">The control.</param>
private void ShowInputPanel(Control control)
{
	NativeMethods.SIPINFO sipInfo;
	var x = 0;
	var y = control.PointToScreen(new Point(0, control.Height)).Y;
 
	this.inputPanel.Enabled = true;
 
	sipInfo = new NativeMethods.SIPINFO();
	sipInfo.cbSize = (uint)Marshal.SizeOf(sipInfo);
	if (NativeMethods.SipGetInfo(ref sipInfo))
	{
		sipInfo.rcSipRect.left = x;
		sipInfo.rcSipRect.top = y;
 
		NativeMethods.SipSetInfo(ref sipInfo);
	}
}

/// <summary>
/// This structure contains information about the current state of the 
/// software-based input panel, such as the software-based input panel 
/// size, screen location, docked status, and visibility status.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct SIPINFO
{
	/// <summary>
	/// Size, in bytes, of the SIPINFO structure. This member must be 
	/// filled in by the application with the size of operator. Because
	/// the system can check the size of the structure to determine 
	/// the operating system version number, this member allows for
	/// future enhancements to the SIPINFO structure while maintaining 
	/// backward compatibility.
	/// </summary>
	public uint cbSize;
 
	/// <summary>
	/// Specifies flags representing state information of the 
	/// software-based input panel. The following table shows the
	/// possible bit flags. These flags can be used in combination. 
	/// </summary>
	public uint fdwFlags;
 
	/// <summary>
	/// Rectangle, in screen coordinates, that represents the area of 
	/// the desktop not obscured by the software-based input panel. 
	/// If the software-based input panel is floating, this rectangle 
	/// is equivalent to the working area. Full-screen applications 
	/// that respond to software-based input panel size changes can 
	/// set their window rectangle to this rectangle. If the
	/// software-based input panel is docked but does not occupy 
	/// an entire edge, then this rectangle represents the largest 
	/// rectangle not obscured by the software-based input panel. 
	/// If an application wants to use the screen space around the
	/// software-based input panel, it needs to reference rcSipRect.
	/// </summary>
	public RECT rcVisibleDesktop;
 
	/// <summary>
	/// Rectangle, in screen coordinates of the window rectangle and 
	/// not the client area, the represents the size and location of 
	/// the software-based input panel. An application does not
	/// generally use this information unless it needs to wrap
	/// around a floating or a docked software-based input panel 
	/// that does not occupy an entire edge.
	/// </summary>
	public RECT rcSipRect;
 
	/// <summary>
	/// Specifies the size of the data pointed to by the pvImData member.
	/// </summary>
	public uint dwImDataSize;
 
	/// <summary>
	/// Void pointer to IM-defined data. The IM calls the
	/// IInputMethod::GetImData and IInputMethod::SetImData methods to
	/// send and receive information from this structure.
	/// </summary>
	public IntPtr pvImData;
}
 
/// <summary>
/// This structure defines the coordinates of the upper-left and
/// lower-right corners of a rectangle. 
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
	/// <summary>
	/// Specifies the x-coordinate of the upper-left corner of the rectangle. 
	/// </summary>
	public int left;
 
	/// <summary>
	/// Specifies the y-coordinate of the upper-left corner of the rectangle. 
	/// </summary>
	public int top;
 
	/// <summary>
	/// Specifies the x-coordinate of the lower-right corner of the rectangle. 
	/// </summary>
	public int right;
 
	/// <summary>
	/// Specifies the y-coordinate of the lower-right corner of the rectangle. 
	/// </summary>
	public int bottom;
}
 
/// <summary>
/// This function receives information including the state of the
/// software-based input panel, the area of the desktop that is not 
/// obscured by the software-based input panel, the screen coordinates
/// of the software-based input panel, and information about the input 
/// method (IM) that the software-based input panel is currently using.
/// </summary>
/// <param name="sipInfo">[out] Pointer to the SIPINFO structure that
/// contains information about the current software-based input panel.</param>
/// <returns>TRUE indicates success. FALSE indicates failure. To get 
/// extended error information, call GetLastError. </returns>
[DllImport("coredll.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SipGetInfo(
	ref SIPINFO sipInfo);
 
/// <summary>
/// This function sets information including the state of the 
/// software-based input panel, the area of the desktop that is not 
/// obscured by the software-based input panel, the screen coordinates 
/// of the software-based input panel, and application-defined information
/// about the input method (IM) that the software-based input panel is
/// currently using.
/// </summary>
/// <param name="sipInfo">ointer to the SIPINFO structure that contains
/// information about the current software-based input panel.</param>
/// <returns>TRUE indicates success. FALSE indicates failure. 
/// To get extended error information, call GetLastError. </returns>
[DllImport("coredll.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SipSetInfo(
	ref SIPINFO sipInfo);

/// <summary>
/// Fired when the user name textbox gets focus.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance 
/// containing the event data.</param>
private void WhenUserNameGotFocus(object sender, EventArgs e)
{
	this.ShowInputPanel(this.userNameTextBox);
}
 
/// <summary>
/// Fired when the user name textbox loses focus.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance 
/// containing the event data.</param>
private void WhenUserNameLostFocus(object sender, EventArgs e)
{
	this.HideInputPanel();
}