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// Some interop code taken from Mike Marshall's AnyForm

using System;

using System.Drawing;

using System.Runtime.InteropServices;

namespace Hardcodet.Wpf.TaskbarNotification.Interop

{

  /// <summary>

  /// Resolves the current tray position.

  /// </summary>

  public static class TrayInfo

  {

    /// <summary>

    /// Gets the position of the system tray.

    /// </summary>

    /// <returns>Tray coordinates.</returns>

    public static Point GetTrayLocation()

    {

      var info = new AppBarInfo();

      info.GetSystemTaskBarPosition();

      Rectangle rcWorkArea = info.WorkArea;

      int x = 0, y = 0;

      if (info.Edge == AppBarInfo.ScreenEdge.Left)

      {

        x = rcWorkArea.Left + 2;

        y = rcWorkArea.Bottom;

      }

      else if (info.Edge == AppBarInfo.ScreenEdge.Bottom)

      {

        x = rcWorkArea.Right;

        y = rcWorkArea.Bottom;

      }

      else if (info.Edge == AppBarInfo.ScreenEdge.Top)

      {

        x = rcWorkArea.Right;

        y = rcWorkArea.Top;

      }

      else if (info.Edge == AppBarInfo.ScreenEdge.Right)

      {

        x = rcWorkArea.Right;

        y = rcWorkArea.Bottom;

      }

      return new Point { X = x, Y = y};

    }

  }

  internal class AppBarInfo

  {

    [DllImport("user32.dll")]

    private static extern IntPtr FindWindow(String lpClassName, String lpWindowName);

    [DllImport("shell32.dll")]

    private static extern UInt32 SHAppBarMessage(UInt32 dwMessage, ref APPBARDATA data);

    [DllImport("user32.dll")]

    private static extern Int32 SystemParametersInfo(UInt32 uiAction, UInt32 uiParam,

                                                     IntPtr pvParam, UInt32 fWinIni);

    private const int ABE_BOTTOM = 3;

    private const int ABE_LEFT = 0;

    private const int ABE_RIGHT = 2;

    private const int ABE_TOP = 1;

    private const int ABM_GETTASKBARPOS = 0x00000005;

    // SystemParametersInfo constants

    private const UInt32 SPI_GETWORKAREA = 0x0030;

    private APPBARDATA m_data;

    public ScreenEdge Edge

    {

      get { return (ScreenEdge) m_data.uEdge; }

    }

    public Rectangle WorkArea

    {

      get

      {

        Int32 bResult = 0;

        var rc = new RECT();

        IntPtr rawRect = Marshal.AllocHGlobal(Marshal.SizeOf(rc));

        bResult = SystemParametersInfo(SPI_GETWORKAREA, 0, rawRect, 0);

        rc = (RECT) Marshal.PtrToStructure(rawRect, rc.GetType());

        if (bResult == 1)

        {

          Marshal.FreeHGlobal(rawRect);

          return new Rectangle(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top);

        }

        return new Rectangle(0, 0, 0, 0);

      }

    }

    public void GetPosition(string strClassName, string strWindowName)

    {

      m_data = new APPBARDATA();

      m_data.cbSize = (UInt32) Marshal.SizeOf(m_data.GetType());

      IntPtr hWnd = FindWindow(strClassName, strWindowName);

      if (hWnd != IntPtr.Zero)

      {

        UInt32 uResult = SHAppBarMessage(ABM_GETTASKBARPOS, ref m_data);

        if (uResult != 1)

        {

          throw new Exception("Failed to communicate with the given AppBar");

        }

      }

      else

      {

        throw new Exception("Failed to find an AppBar that matched the given criteria");

      }

    }

    public void GetSystemTaskBarPosition()

    {

      GetPosition("Shell_TrayWnd", null);

    }

    public enum ScreenEdge

    {

      Undefined = -1,

      Left = ABE_LEFT,

      Top = ABE_TOP,

      Right = ABE_RIGHT,

      Bottom = ABE_BOTTOM

    }

    [StructLayout(LayoutKind.Sequential)]

    private struct APPBARDATA

    {

      public UInt32 cbSize;

      public IntPtr hWnd;

      public UInt32 uCallbackMessage;

      public UInt32 uEdge;

      public RECT rc;

      public Int32 lParam;

    }

    [StructLayout(LayoutKind.Sequential)]

    private struct RECT

    {

      public Int32 left;

      public Int32 top;

      public Int32 right;

      public Int32 bottom;

    }

  }

}