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' ***********************************************************************
' Author           : Elektro
' Last Modified On : 16-February-2015
' ***********************************************************************
' <copyright file="MouseHook.vb" company="Elektro Studios">
'     Copyright (c) Elektro Studios. All rights reserved.
' </copyright>
' ***********************************************************************

#Region " Option Statements "

Option Strict On
Option Explicit On
Option Infer Off

#End Region

#Region " Instructions "

' Go to page:
' Project > Properties > Debug
'
' Then uncheck the option:
' "Enable the Visual Studio Hosting Process"

#End Region

#Region " Usage Examples "

' ''' <summary>
' ''' A low level mouse hook that intercepts mouse events.
' ''' </summary>
'Private WithEvents mouseEvents As New MouseHook(Install:=False) With
'    {
'        .WorkingArea = SystemInformation.VirtualScreen,
'        .SuppressMouseUpEventWhenDoubleClick = False
'    }

' ''' <summary>
' ''' Handles the Load event of the Form1.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
'Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

'    ' Install Mouse Hook on the System.
'    Me.MouseEvents.Install()

'    ' Start processing mouse events.
'    Me.MouseEvents.Enable()

'End Sub

' ''' <summary>
' ''' Handles the FormClosing event of the Form1.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="e">The <see cref="FormClosingEventArgs"/> instance containing the event data.</param>
'Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) _
'Handles MyBase.FormClosing

'    ' Stop processing mouse events.
'    Me.MouseEvents.Disable()

'    ' Uninstall the mouse hook from system.
'    Me.MouseEvents.Uninstall()

'End Sub

' ''' <summary>
' ''' Handles the 'MouseMove' event of the Mouse Hook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseMove(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseMove

'    Debug.WriteLine(String.Format("Mouse Moved To: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseLeftDown' event of the MouseHook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseLeftDown(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseLeftDown

'    Debug.WriteLine(String.Format("Mouse Left Down At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseLeftUp' event of the Mouse Hook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseLeftUp(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseLeftUp

'    Debug.WriteLine(String.Format("Mouse Left Up At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseRightDown' event of the MouseHook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseRightDown(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseRightDown

'    Debug.WriteLine(String.Format("Mouse Right Down At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseRightUp' event of the Mouse Hook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseRightUp(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseRightUp

'    Debug.WriteLine(String.Format("Mouse Right Up At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseMiddleDown' event of the MouseHook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseMiddleDown(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseMiddleDown

'    Debug.WriteLine(String.Format("Mouse Middle Down At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseMiddleUp' event of the Mouse Hook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseMiddleUp(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseMiddleUp

'    Debug.WriteLine(String.Format("Mouse Middle Up At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseLeftDoubleClick' event of the Mouse Hook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseLeftDoubleClick(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseLeftDoubleClick

'    Debug.WriteLine(String.Format("Mouse Left Double-Click At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseRightDoubleClick' event of the Mouse Hook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseRightDoubleClick(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseRightDoubleClick

'    Debug.WriteLine(String.Format("Mouse Right Double-Click At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseMiddleDoubleClick' event of the Mouse Hook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
'Private Sub MouseEvents_MouseMiddleDoubleClick(ByVal sender As Object, ByVal MouseLocation As Point) _
'Handles MouseEvents.MouseMiddleDoubleClick

'    Debug.WriteLine(String.Format("Mouse Middle Double-Click At: x={0}, y={1}",
'                                  CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

' ''' <summary>
' ''' Handles the 'MouseWheel' event of the Mouse Hook.
' ''' </summary>
' ''' <param name="sender">The source of the event.</param>
' ''' <param name="MouseLocation">Contains the mouse [X,Y] coordinates where the event fired.</param>
' ''' <param name="WheelDirection">Contains the wheel direction (WheelUp or WheelDown).</param>
'Private Sub MouseEvents_MouseWheel(ByVal sender As Object,
'                                   ByVal MouseLocation As Point,
'                                   ByVal WheelDirection As MouseHook.WheelDirection) _
'Handles MouseEvents.MouseWheel

'    Debug.WriteLine(String.Format("Mouse Whell ({0}) At: x={1}, y={2}",
'                                  WheelDirection.ToString, CStr(MouseLocation.X), CStr(MouseLocation.Y)))

'End Sub

#End Region

#Region " Imports "

Imports System.ComponentModel
Imports System.Reflection
Imports System.Runtime.InteropServices

#End Region

#Region " MouseHook "

''' <summary>
''' A low level mouse hook that processes mouse input events.
''' </summary>
Friend NotInheritable Class MouseHook : Implements IDisposable

#Region " P/Invoke "

    ''' <summary>
    ''' Platform Invocation methods (P/Invoke), access unmanaged code.
    ''' This class does not suppress stack walks for unmanaged code permission.
    ''' <see cref="System.Security.SuppressUnmanagedCodeSecurityAttribute"/>  must not be applied to this class.
    ''' This class is for methods that can be used anywhere because a stack walk will be performed.
    ''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/ms182161.aspx
    ''' </summary>
    Protected NotInheritable Class NativeMethods

#Region " Methods "

        ''' <summary>
        ''' Passes the hook information to the next hook procedure in the current hook chain.
        ''' A hook procedure can call this function either before or after processing the hook information.
        ''' For more info see here:
        ''' http://msdn.microsoft.com/en-us/library/windows/desktop/ms644974%28v=vs.85%29.aspx
        ''' </summary>
        ''' <param name="idHook">
        ''' This parameter is ignored.
        ''' </param>
        ''' <param name="nCode">
        ''' The hook code passed to the current hook procedure.
        ''' The next hook procedure uses this code to determine how to process the hook information.
        ''' </param>
        ''' <param name="wParam">
        ''' The wParam value passed to the current hook procedure.
        ''' The meaning of this parameter depends on the type of hook associated with the current hook chain.
        ''' </param>
        ''' <param name="lParam">
        ''' The lParam value passed to the current hook procedure.
        ''' The meaning of this parameter depends on the type of hook associated with the current hook chain.
        ''' </param>
        ''' <returns>
        ''' This value is returned by the next hook procedure in the chain.
        ''' The current hook procedure must also return this value.
        ''' The meaning of the return value depends on the hook type.
        ''' For more information, see the descriptions of the individual hook procedures.
        ''' </returns>
        <DllImport("user32.dll", CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Auto)>
        Public Shared Function CallNextHookEx(
               ByVal idHook As IntPtr,
               ByVal nCode As Integer,
               ByVal wParam As IntPtr,
               ByVal lParam As IntPtr
        ) As IntPtr
        End Function

        ''' <summary>
        ''' Installs an application-defined hook procedure into a hook chain.
        ''' You would install a hook procedure to monitor the system for certain types of events.
        ''' These events are associated either with a specific thread
        ''' or with all threads in the same desktop as the calling thread.
        ''' For more info see here:
        ''' http://msdn.microsoft.com/en-us/library/windows/desktop/ms644990%28v=vs.85%29.aspx
        ''' </summary>
        ''' <param name="idHook">
        ''' The type of hook procedure to be installed.
        ''' </param>
        ''' <param name="lpfn">
        ''' A pointer to the hook procedure.
        ''' If the dwThreadId parameter is zero or specifies the identifier of a thread created by a different process,
        ''' the lpfn parameter must point to a hook procedure in a DLL.
        ''' Otherwise, lpfn can point to a hook procedure in the code associated with the current process.
        ''' </param>
        ''' <param name="hInstance">
        ''' A handle to the DLL containing the hook procedure pointed to by the lpfn parameter.
        ''' The hMod parameter must be set to NULL if the dwThreadId parameter specifies a thread created by
        ''' the current process and if the hook procedure is within the code associated with the current process.
        ''' </param>
        ''' <param name="threadId">
        ''' The identifier of the thread with which the hook procedure is to be associated.
        ''' For desktop apps, if this parameter is zero, the hook procedure is associated
        ''' with all existing threads running in the same desktop as the calling thread.
        ''' </param>
        ''' <returns>
        ''' If the function succeeds, the return value is the handle to the hook procedure.
        ''' If the function fails, the return value is NULL.
        ''' </returns>
        <DllImport("user32.dll", CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Auto)>
        Public Shared Function SetWindowsHookEx(
               ByVal idHook As HookType,
               ByVal lpfn As LowLevelMouseProcDelegate,
               ByVal hInstance As IntPtr,
               ByVal threadId As UInteger
        ) As IntPtr
        End Function

        ''' <summary>
        ''' Removes a hook procedure installed in a hook chain by the 'SetWindowsHookEx' function.
        ''' For more info see here:
        ''' http://msdn.microsoft.com/en-us/library/windows/desktop/ms644993%28v=vs.85%29.aspx
        ''' </summary>
        ''' <param name="idHook">
        ''' A handle to the hook to be removed.
        ''' This parameter is a hook handle obtained by a previous call to SetWindowsHookEx.
        ''' </param>
        ''' <returns>
        ''' If the function succeeds, the return value is nonzero.
        ''' If the function fails, the return value is zero.
        ''' </returns>
        <DllImport("user32.dll", CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Auto)>
        Public Shared Function UnhookWindowsHookEx(
               ByVal idHook As IntPtr
        ) As Boolean
        End Function

        ''' <summary>
        ''' Retrieves the current double-click time for the mouse.
        ''' A double-click is a series of two clicks of the mouse button,
        ''' the second occurring within a specified time after the first.
        ''' The double-click time is the maximum number of milliseconds that may occur
        ''' between the first and second click of a double-click.
        ''' The maximum double-click time is 5000 milliseconds.
        ''' </summary>
        ''' <returns>
        ''' The return value specifies the current double-click time, in milliseconds.
        ''' The maximum return value is 5000 milliseconds.
        ''' </returns>
        <DllImport("user32.dll", CharSet:=CharSet.Auto)>
        Public Shared Function GetDoubleClickTime() As Integer
        End Function

#End Region

#Region " Enumerations "

        ''' <summary>
        ''' Specifies a System-Defined Message.
        ''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644927%28v=vs.85%29.aspx#system_defined
        ''' </summary>
        Public Enum WindowsMessages As UInteger

            ''' <summary>
            ''' Posted to a window when the cursor moves.
            ''' If the mouse is not captured, the message is posted to the window that contains the cursor.
            ''' Otherwise, the message is posted to the window that has captured the mouse
            ''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ff468877%28v=vs.85%29.aspx
            ''' </summary>
            WM_MOUSEMOVE = &H200UI

            ''' <summary>
            ''' Posted when the user presses the left mouse button while the cursor is in the client area of a window.
            ''' If the mouse is not captured, the message is posted to the window beneath the cursor.
            ''' Otherwise, the message is posted to the window that has captured the mouse
            ''' </summary>
            WM_LBUTTONDOWN = &H201UI

            ''' <summary>
            ''' Posted when the user releases the left mouse button while the cursor is in the client area of a window.
            ''' If the mouse is not captured, the message is posted to the window beneath the cursor.
            ''' Otherwise, the message is posted to the window that has captured the mouse
            ''' </summary>
            WM_LBUTTONUP = &H202UI

            ''' <summary>
            ''' Posted when the user presses the right mouse button while the cursor is in the client area of a window.
            ''' If the mouse is not captured, the message is posted to the window beneath the cursor.
            ''' Otherwise, the message is posted to the window that has captured the mouse
            ''' </summary>
            WM_RBUTTONDOWN = &H204UI

            ''' <summary>
            ''' Posted when the user releases the right mouse button while the cursor is in the client area of a window.
            ''' If the mouse is not captured, the message is posted to the window beneath the cursor.
            ''' Otherwise, the message is posted to the window that has captured the mouse
            ''' </summary>
            WM_RBUTTONUP = &H205UI

            ''' <summary>
            ''' Posted when the user presses the middle mouse button while the cursor is in the client area of a window.
            ''' If the mouse is not captured, the message is posted to the window beneath the cursor.
            ''' Otherwise, the message is posted to the window that has captured the mouse
            ''' </summary>
            WM_MBUTTONDOWN = &H207UI

            ''' <summary>
            ''' Posted when the user releases the middle mouse button while the cursor is in the client area of a window.
            ''' If the mouse is not captured, the message is posted to the window beneath the cursor.
            ''' Otherwise, the message is posted to the window that has captured the mouse
            ''' </summary>
            WM_MBUTTONUP = &H208UI

            ''' <summary>
            ''' Sent to the active window when the mouse's horizontal scroll wheel is tilted or rotated.
            ''' The DefWindowProc function propagates the message to the window's parent.
            ''' There should be no internal forwarding of the message,
            ''' since DefWindowProc propagates it up the parent chain until it finds a window that processes it.
            ''' </summary>
            WM_MOUSEWHEEL = &H20AUI

        End Enum

        ''' <summary>
        ''' Indicates a type of Hook procedure to be installed.
        ''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644990%28v=vs.85%29.aspx
        ''' </summary>
        Public Enum HookType As UInteger

            ' **************************************
            ' This enumeration is partially defined.
            ' **************************************

            ''' <summary>
            ''' Installs a hook procedure that monitors low-level mouse input events.
            ''' For more information, see the LowLevelMouseProc hook procedure.
            ''' </summary>
            WH_MOUSE_LL = 14UI

        End Enum

        ''' <summary>
        ''' The event-injected flags.
        ''' An application can use the following values to test the flags.
        ''' Testing LLMHF_INJECTED (bit 0) will tell you whether the event was injected.
        ''' If it was, then testing LLMHF_LOWER_IL_INJECTED (bit 1) will tell you
        ''' whether or not the event was injected from a process running at lower integrity level.
        ''' </summary>
        <Flags()>
        Public Enum MsllHookStructFlags As Integer

            ''' <summary>
            ''' Test the event-injected (from any process) flag.
            ''' </summary>
            LLMHF_INJECTED = 1I

            ''' <summary>
            ''' Test the event-injected (from a process running at lower integrity level) flag.
            ''' </summary>
            LLMHF_LOWER_IL_INJECTED = 2I

        End Enum

#End Region

#Region " Structures "

        ''' <summary>
        ''' The POINT structure defines the x- and y- coordinates of a point.
        ''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/dd162805%28v=vs.85%29.aspx
        ''' </summary>
        <StructLayout(LayoutKind.Sequential)>
        Public Structure Point

            ''' <summary>
            ''' The x-coordinate of the point.
            ''' </summary>
            Public X As Integer

            ''' <summary>
            ''' The y-coordinate of the point.
            ''' </summary>
            Public Y As Integer

        End Structure

        ''' <summary>
        ''' Contains information about a low-level mouse input event.
        ''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644970%28v=vs.85%29.aspx
        ''' </summary>
        Public Structure MsllHookStruct

            ''' <summary>
            ''' The ptThe x- and y-coordinates of the cursor, in screen coordinates.
            ''' </summary>
            Public Pt As NativeMethods.Point

            ''' <summary>
            ''' If the message is 'WM_MOUSEWHEEL', the high-order word of this member is the wheel delta.
            ''' The low-order word is reserved.
            ''' A positive value indicates that the wheel was rotated forward, away from the user;
            ''' a negative value indicates that the wheel was rotated backward, toward the user.
            ''' One wheel click is defined as 'WHEEL_DELTA', which is '120'.
            ''' </summary>
            Public MouseData As Integer

            ''' <summary>
            ''' The event-injected flag.
            ''' </summary>
            Public Flags As MsllHookStructFlags

            ''' <summary>
            ''' The time stamp for this message.
            ''' </summary>
            Public Time As UInteger

            ''' <summary>
            ''' Additional information associated with the message.
            ''' </summary>
            Public DwExtraInfo As IntPtr

        End Structure

#End Region

#Region " Delegates "

        ''' <summary>
        ''' Delegate LowLevelMouseProc
        ''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644986%28v=vs.85%29.aspx
        ''' </summary>
        ''' <returns>
        ''' If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
        ''' If nCode is greater than or equal to zero, and the hook procedure did not process the message,
        ''' it is highly recommended that you call CallNextHookEx and return the value it returns;
        ''' otherwise, other applications that have installed WH_MOUSE_LL hooks will not receive hook notifications
        ''' and may behave incorrectly as a result.
        ''' If the hook procedure processed the message,
        ''' it may return a nonzero value to prevent the system from passing the message to the rest of the hook chain or the target window procedure.
        ''' </returns>
        Public Delegate Function LowLevelMouseProcDelegate(
                ByVal nCode As Integer,
                ByVal wParam As NativeMethods.WindowsMessages,
                ByVal lParam As IntPtr
        ) As Integer

#End Region

#Region " Hidden Methods "

        ''' <summary>
        ''' Determines whether the specified System.Object instances are considered equal.
        ''' </summary>
        <EditorBrowsable(EditorBrowsableState.Never)>
        Public Shadows Sub Equals()
        End Sub

        ''' <summary>
        ''' Determines whether the specified System.Object instances are the same instance.
        ''' </summary>
        <EditorBrowsable(EditorBrowsableState.Never)>
        Private Shadows Sub ReferenceEquals()
        End Sub

#End Region

    End Class

#End Region

#Region " Properties "

    ''' <summary>
    ''' Handle to the hook procedure.
    ''' </summary>
    Private Property MouseHook As IntPtr

    ''' <summary>
    ''' The mouse hook delegate.
    ''' </summary>
    Private Property MouseHookDelegate As NativeMethods.LowLevelMouseProcDelegate

    ''' <summary>
    ''' Determines whether the Hook is installed.
    ''' </summary>
    Public Property IsInstalled As Boolean

    ''' <summary>
    ''' Determines whether the Hook is enabled.
    ''' </summary>
    Public Property IsEnabled As Boolean = False

    ''' <summary>
    ''' ** ONLY FOR TESTING PURPOSES **
    ''' Gets or sets a value indicating whether to suppress the last MouseUp event of
    ''' the specified clicked button when a double-click fires.
    '''
    ''' If this value is set to <c>true</c>, the application will send the events in this order for a Double-Click:
    ''' MouseDown, MouseUp, MouseDown, MouseDoubleClick
    '''
    ''' If this value is set to <c>false</c>, the application will send the events in this order for a Double-Click:
    ''' MouseDown, MouseUp, MouseDown, MouseUp, MouseDoubleClick
    '''
    ''' </summary>
    ''' <value><c>true</c> if MouseUp event is suppressed; otherwise <c>false</c>.</value>
    Public Property SuppressMouseUpEventWhenDoubleClick As Boolean = False

    ''' <summary>
    ''' Gets or sets the screen's working area.
    ''' The events fired by this <see cref="MouseHook"/> instance will be restricted to the bounds of the specified rectangle.
    ''' </summary>
    ''' <value>The screen's working area.</value>
    Public Property WorkingArea As Rectangle
        Get
            Return Me.workingarea1
        End Get
        Set(ByVal value As Rectangle)
            Me.workingarea1 = value
        End Set
    End Property

    ''' <summary>
    ''' The screen's working area
    ''' </summary>
    Private workingarea1 As Rectangle = SystemInformation.VirtualScreen

#End Region

#Region " Enumerations "

    ''' <summary>
    ''' Indicates the whell direction of the mouse.
    ''' </summary>
    Public Enum WheelDirection As Integer

        ''' <summary>
        ''' The wheel is moved up.
        ''' </summary>
        WheelUp = 1I

        ''' <summary>
        ''' The wheel is moved down.
        ''' </summary>
        WheelDown = 2I

    End Enum

#End Region

#Region " Events "

    ''' <summary>
    ''' Occurs when the mouse moves.
    ''' </summary>
    Public Event MouseMove(ByVal sender As Object,
                           ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse left button is pressed.
    ''' </summary>
    Public Event MouseLeftDown(ByVal sender As Object,
                               ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse left button is released.
    ''' </summary>
    Public Event MouseLeftUp(ByVal sender As Object,
                             ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse left button performs a double-click.
    ''' A double click is considered as: (MouseLeftDown + MouseLeftUp) * 2
    ''' </summary>
    Public Event MouseLeftDoubleClick(ByVal sender As Object,
                                      ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse right button is pressed.
    ''' </summary>
    Public Event MouseRightDown(ByVal sender As Object,
                                ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse right button is released.
    ''' </summary>
    Public Event MouseRightUp(ByVal sender As Object,
                              ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse right button performs a double-click.
    ''' A double click is considered as: (MouseLeftDown + MouseLeftUp) * 2
    ''' </summary>
    Public Event MouseRightDoubleClick(ByVal sender As Object,
                                       ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse middle button is pressed.
    ''' </summary>
    Public Event MouseMiddleDown(ByVal sender As Object,
                                 ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse middle button is released.
    ''' </summary>
    Public Event MouseMiddleUp(ByVal sender As Object,
                               ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse middle button performs a double-click.
    ''' A double click is considered as: (MouseLeftDown + MouseLeftUp) * 2
    ''' </summary>
    Public Event MouseMiddleDoubleClick(ByVal sender As Object,
                                        ByVal mouseLocation As Point)

    ''' <summary>
    ''' Occurs when the mouse wheel is moved up or down.
    ''' </summary>
    Public Event MouseWheel(ByVal sender As Object,
                            ByVal mouseLocation As Point,
                            ByVal wheelDirection As WheelDirection)

#End Region

#Region " Exceptions "

    ''' <summary>
    ''' Exception that is thrown when trying to enable or uninstall a mouse hook that is not installed.
    ''' </summary>
    <Serializable>
    Friend NotInheritable Class MouseHookNotInstalledException : Inherits Exception

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookNotInstalledException"/> class.
        ''' </summary>
        Friend Sub New()
            MyBase.New("MouseHook is not installed.")
        End Sub

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookNotInstalledException" /> class with a specified error message.
        ''' </summary>
        ''' <param name="message">The message that describes the error.</param>
        Friend Sub New(message As String)
            MyBase.New(message)
        End Sub

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookNotInstalledException"/> class.
        ''' </summary>
        ''' <param name="message">The message that describes the error.</param>
        ''' <param name="inner">The inner exception.</param>
        Friend Sub New(message As String, inner As Exception)
            MyBase.New(message, inner)
        End Sub

    End Class

    ''' <summary>
    ''' Exception that is thrown when trying to disable a mouse hook that is not enabled.
    ''' </summary>
    <Serializable>
    Friend NotInheritable Class MouseHookNotEnabledException : Inherits Exception

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookNotEnabledException"/> class.
        ''' </summary>
        Friend Sub New()
            MyBase.New("MouseHook is not enabled.")
        End Sub

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookNotEnabledException" /> class with a specified error message.
        ''' </summary>
        ''' <param name="message">The message that describes the error.</param>
        Friend Sub New(message As String)
            MyBase.New(message)
        End Sub

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookNotEnabledException"/> class.
        ''' </summary>
        ''' <param name="message">The message that describes the error.</param>
        ''' <param name="inner">The inner exception.</param>
        Friend Sub New(message As String, inner As Exception)
            MyBase.New(message, inner)
        End Sub

    End Class

    ''' <summary>
    ''' Exception that is thrown when trying to enable a mouse hook that is already enabled.
    ''' </summary>
    <Serializable>
    Friend NotInheritable Class MouseHookEnabledException : Inherits Exception

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookEnabledException"/> class.
        ''' </summary>
        Friend Sub New()
            MyBase.New("MouseHook is already enabled.")
        End Sub

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookEnabledException" /> class with a specified error message.
        ''' </summary>
        ''' <param name="message">The message that describes the error.</param>
        Friend Sub New(message As String)
            MyBase.New(message)
        End Sub

        ''' <summary>
        ''' Initializes a new instance of the <see cref="MouseHookEnabledException"/> class.
        ''' </summary>
        ''' <param name="message">The message that describes the error.</param>
        ''' <param name="inner">The inner exception.</param>
        Friend Sub New(message As String, inner As Exception)
            MyBase.New(message, inner)
        End Sub

    End Class

#End Region

#Region " Constructors "

    ''' <summary>
    ''' Prevents a default instance of the <see cref="MouseHook"/> class from being created.
    ''' </summary>
    Private Sub New()
    End Sub

    ''' <summary>
    ''' Initializes a new instance of the <see cref="MouseHook"/> class.
    ''' </summary>
    ''' <param name="Install">
    ''' If set to <c>true</c>, the Hook starts initialized for this <see cref="MouseHook"/> instance.
    ''' </param>
    Public Sub New(Optional ByVal install As Boolean = False)

        If install Then
            Me.Install()
        End If

    End Sub

#End Region

#Region " Public Methods "

    ''' <summary>
    ''' Installs the Mouse Hook, then start processing messages to fire events.
    ''' </summary>
    Public Sub Install()

        If Me.IsVisualStudioHostingProcessEnabled() Then
            Throw New Exception("Visual Studio Hosting Process should be deactivated.")
            Exit Sub
        End If

        Me.MouseHookDelegate = New NativeMethods.LowLevelMouseProcDelegate(AddressOf LowLevelMouseProc)

        Try
            Me.MouseHook = NativeMethods.SetWindowsHookEx(NativeMethods.HookType.WH_MOUSE_LL,
                                                          Me.MouseHookDelegate,
                                                          New IntPtr(Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly.GetModules()(0)).ToInt32), 0)

            Me.IsInstalled = True

        Catch ex As Exception
            Throw

        End Try

    End Sub

    ''' <summary>
    ''' Uninstalls the Mouse Hook and free all resources, then stop processing messages to fire events.
    ''' </summary>
    Public Sub Uninstall()

        If Not Me.IsInstalled Then
            Throw New MouseHookNotInstalledException

        Else
            Me.IsEnabled = False
            Me.IsInstalled = False
            Me.Finalize()

        End If

    End Sub

    ''' <summary>
    ''' Temporally disables the Mouse Hook events.
    ''' To Re-enable the events, call the <see cref="Enable"/> method.
    ''' </summary>
    Public Sub Disable()

        If Not Me.IsInstalled Then
            Throw New MouseHookNotInstalledException

        ElseIf Not Me.IsEnabled Then
            Throw New MouseHookNotEnabledException

        Else
            Me.IsEnabled = False

        End If

    End Sub

    ''' <summary>
    ''' Re-enables the Mouse Hook events.
    ''' </summary>
    Public Sub Enable()

        If Not Me.IsInstalled Then
            Throw New MouseHookNotInstalledException

        ElseIf Me.IsEnabled Then
            Throw New MouseHookEnabledException

        Else
            Me.IsEnabled = True

        End If

    End Sub

#End Region

#Region " Private Methods "

    ''' <summary>
    ''' Determines whether the Visual Studio Hosting Process is enabled on the current application.
    ''' </summary>
    ''' <returns><c>true</c> if Visual Studio Hosting Process is enabled; otherwise, <c>false</c>.</returns>
    Private Function IsVisualStudioHostingProcessEnabled() As Boolean
        Return AppDomain.CurrentDomain.FriendlyName.EndsWith("vshost.exe", StringComparison.OrdinalIgnoreCase)
    End Function

    ''' <summary>
    ''' Processes the mouse windows messages and raises it's corresponding events.
    ''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644986%28v=vs.85%29.aspx
    ''' </summary>
    ''' <param name="nCode">
    ''' A code the hook procedure uses to determine how to process the message.
    ''' If nCode is less than zero, the hook procedure must pass the message to the CallNextHookEx function
    ''' without further processing and should return the value returned by CallNextHookEx.
    ''' </param>
    ''' <param name="wParam">The identifier of the mouse message.</param>
    ''' <param name="lParam"> A pointer to an <see cref="NativeMethods.MSLLHOOKSTRUCT"/> structure.</param>
    ''' <returns>
    ''' If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
    ''' If nCode is greater than or equal to zero, and the hook procedure did not process the message,
    ''' it is highly recommended that you call CallNextHookEx and return the value it returns;
    ''' otherwise, other applications that have installed WH_MOUSE_LL hooks will not receive hook notifications
    ''' and may behave incorrectly as a result.
    ''' If the hook procedure processed the message,
    ''' it may return a nonzero value to prevent the system from passing the
    ''' message to the rest of the hook chain or the target window procedure.
    ''' </returns>
    Private Function LowLevelMouseProc(ByVal nCode As Integer,
                                       ByVal wParam As NativeMethods.WindowsMessages,
                                       ByVal lParam As IntPtr) As Integer

        If Not Me.IsEnabled Then
            Return CInt(NativeMethods.CallNextHookEx(MouseHook, nCode, New IntPtr(wParam), lParam))
        End If

        Static leftClickTime As Integer = 0I ' Determines a left button double-click.
        Static rightClickTime As Integer = 0I ' Determines a right button double-click.
        Static middleClickTime As Integer = 0I ' Determines a middle button double-click.

        If nCode = 0I Then

            Dim x As Integer
            Dim y As Integer

            Dim mouseStruct As NativeMethods.MsllHookStruct
            mouseStruct = CType(Marshal.PtrToStructure(lParam, mouseStruct.GetType()),
                                NativeMethods.MsllHookStruct)

            ' Fix X coordinate.
            Select Case mouseStruct.Pt.X

                Case Is <= 0I
                    If mouseStruct.Pt.X >= Me.WorkingArea.Location.X Then
                        x = mouseStruct.Pt.X

                    ElseIf mouseStruct.Pt.X <= Me.WorkingArea.Location.X Then

                        If mouseStruct.Pt.X <= (Me.WorkingArea.Location.X - Me.WorkingArea.Width) Then
                            x = (Me.WorkingArea.Location.X - Me.WorkingArea.Width)
                        Else
                            x = mouseStruct.Pt.X

                        End If

                    End If

                Case Is >= Me.WorkingArea.Width
                    x = Me.WorkingArea.Width

                Case Else
                    x = mouseStruct.Pt.X

            End Select

            ' Fix Y coordinate.
            Select Case mouseStruct.Pt.Y

                Case Is >= Me.WorkingArea.Height
                    y = Me.WorkingArea.Height

                Case Is <= 0I
                    y = 0I

                Case Else
                    y = mouseStruct.Pt.Y

            End Select

            If x <= Me.WorkingArea.Width AndAlso
               y < Me.WorkingArea.Height AndAlso
               mouseStruct.Pt.X > Me.WorkingArea.Width Then
                Return CInt(NativeMethods.CallNextHookEx(MouseHook, nCode, New IntPtr(wParam), lParam))

            ElseIf x <= Me.WorkingArea.Width AndAlso
                   y < Me.WorkingArea.Height AndAlso
                   mouseStruct.Pt.X < Me.WorkingArea.X Then
                Return CInt(NativeMethods.CallNextHookEx(MouseHook, nCode, New IntPtr(wParam), lParam))

            ElseIf x = Me.WorkingArea.Width AndAlso
                   y < Me.WorkingArea.Height Then

                If Not Me.WorkingArea.Contains(x - 1, y) Then
                    Return CInt(NativeMethods.CallNextHookEx(MouseHook, nCode, New IntPtr(wParam), lParam))
                End If

            ElseIf x < Me.WorkingArea.Width AndAlso
                   y = Me.WorkingArea.Height Then

                If Not Me.WorkingArea.Contains(x, y - 1) Then
                    Return CInt(NativeMethods.CallNextHookEx(MouseHook, nCode, New IntPtr(wParam), lParam))
                End If

            End If

            Select Case wParam

                Case NativeMethods.WindowsMessages.WM_MOUSEMOVE
                    RaiseEvent MouseMove(Me, New Point(x, y))

                Case NativeMethods.WindowsMessages.WM_LBUTTONDOWN
                    RaiseEvent MouseLeftDown(Me, New Point(x, y))

                Case NativeMethods.WindowsMessages.WM_LBUTTONUP
                    If leftClickTime <> 0 Then
                        leftClickTime = Environment.TickCount() - leftClickTime
                    End If

                    If (leftClickTime <> 0I) AndAlso (leftClickTime < NativeMethods.GetDoubleClickTime()) Then
                        leftClickTime = 0I
                        If Not Me.SuppressMouseUpEventWhenDoubleClick Then
                            RaiseEvent MouseLeftUp(Me, New Point(x, y))
                        End If
                        RaiseEvent MouseLeftDoubleClick(Me, New Point(x, y))

                    Else
                        leftClickTime = Environment.TickCount()
                        RaiseEvent MouseLeftUp(Me, New Point(x, y))

                    End If

                Case NativeMethods.WindowsMessages.WM_RBUTTONDOWN
                    RaiseEvent MouseRightDown(Me, New Point(x, y))

                Case NativeMethods.WindowsMessages.WM_RBUTTONUP
                    If rightClickTime <> 0I Then
                        rightClickTime = Environment.TickCount() - rightClickTime
                    End If

                    If (rightClickTime <> 0I) AndAlso (rightClickTime < NativeMethods.GetDoubleClickTime()) Then
                        rightClickTime = 0I
                        If Not Me.SuppressMouseUpEventWhenDoubleClick Then
                            RaiseEvent MouseRightUp(Me, New Point(x, y))
                        End If
                        RaiseEvent MouseRightDoubleClick(Me, New Point(x, y))

                    Else
                        rightClickTime = Environment.TickCount()
                        RaiseEvent MouseRightUp(Me, New Point(x, y))

                    End If

                Case NativeMethods.WindowsMessages.WM_MBUTTONDOWN
                    RaiseEvent MouseMiddleDown(Me, New Point(x, y))

                Case NativeMethods.WindowsMessages.WM_MBUTTONUP
                    If middleClickTime <> 0I Then
                        middleClickTime = Environment.TickCount() - middleClickTime
                    End If

                    If (middleClickTime <> 0I) AndAlso (middleClickTime < NativeMethods.GetDoubleClickTime()) Then
                        middleClickTime = 0I
                        If Not Me.SuppressMouseUpEventWhenDoubleClick Then
                            RaiseEvent MouseMiddleUp(Me, New Point(x, y))
                        End If
                        RaiseEvent MouseMiddleDoubleClick(Me, New Point(x, y))

                    Else
                        middleClickTime = Environment.TickCount()
                        RaiseEvent MouseMiddleUp(Me, New Point(x, y))

                    End If

                Case NativeMethods.WindowsMessages.WM_MOUSEWHEEL
                    RaiseEvent MouseWheel(Me, New Point(x, y), If(mouseStruct.MouseData < 0I,
                                                                 WheelDirection.WheelDown,
                                                                 WheelDirection.WheelUp))

                Case Else
                    ' Do Nothing
                    Exit Select

            End Select

            Return CInt(NativeMethods.CallNextHookEx(MouseHook, nCode, New IntPtr(wParam), lParam))

        ElseIf nCode < 0I Then
            Return CInt(NativeMethods.CallNextHookEx(MouseHook, nCode, New IntPtr(wParam), lParam))

        Else ' nCode > 0
            Return CInt(NativeMethods.CallNextHookEx(MouseHook, nCode, New IntPtr(wParam), lParam))

        End If

    End Function

#End Region

#Region " Hidden Methods "

    ''' <summary>
    ''' Serves as a hash function for a particular type.
    ''' </summary>
    <EditorBrowsable(EditorBrowsableState.Never)>
    Public Shadows Sub GetHashCode()
    End Sub

    ''' <summary>
    ''' Gets the System.Type of the current instance.
    ''' </summary>
    ''' <returns>The exact runtime type of the current instance.</returns>
    <EditorBrowsable(EditorBrowsableState.Never)>
    Public Shadows Function [GetType]() As Type
        Return Me.GetType
    End Function

    ''' <summary>
    ''' Determines whether the specified System.Object instances are considered equal.
    ''' </summary>
    <EditorBrowsable(EditorBrowsableState.Never)>
    Public Shadows Sub Equals()
    End Sub

    ''' <summary>
    ''' Determines whether the specified System.Object instances are the same instance.
    ''' </summary>
    <EditorBrowsable(EditorBrowsableState.Never)>
    Private Shadows Sub ReferenceEquals()
    End Sub

    ''' <summary>
    ''' Returns a String that represents the current object.
    ''' </summary>
    <EditorBrowsable(EditorBrowsableState.Never)>
    Public Shadows Sub ToString()
    End Sub

#End Region

#Region "IDisposable Support"

    ''' <summary>
    ''' Flag to detect redundant calls at <see cref="Dispose"/> method.
    ''' </summary>
    Private disposedValue As Boolean

    ''' <summary>
    ''' Releases unmanaged and optionally managed resources.
    ''' </summary>
    ''' <param name="disposing">
    ''' <c>true</c> to release both managed and unmanaged resources;
    ''' <c>false</c> to release only unmanaged resources.
    ''' </param>
    Protected Sub Dispose(ByVal disposing As Boolean)

        Me.IsEnabled = False

        If Not Me.disposedValue Then

            If disposing Then ' Dispose managed state (managed objects).

            Else ' Free unmanaged resources (unmanaged objects).
                NativeMethods.UnhookWindowsHookEx(Me.MouseHook)

            End If

        End If

        Me.disposedValue = True

    End Sub

    ''' <summary>
    ''' Allows an object to try to free resources
    ''' and perform other cleanup operations before it is reclaimed by garbage collection.
    ''' </summary>
    Protected Overrides Sub Finalize()

        ' Do not change this code. Put cleanup code in method: Dispose(ByVal disposing As Boolean)

        Me.Dispose(disposing:=False)
        MyBase.Finalize()

    End Sub

    ''' <summary>
    ''' Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
    ''' </summary>
    Private Sub Dispose() Implements IDisposable.Dispose

        ' Do not change this code. Put cleanup code in method: Dispose(ByVal disposing As Boolean)

        Me.Dispose(disposing:=True)
        GC.SuppressFinalize(obj:=Me)

    End Sub

#End Region

End Class

#End Region