' A WebBrowser host fashioned as a UserControl. This allows us to:
' (1) Encapsulate common tasks while using the WebOC (performing actions on DocumentComplete, saving files to 
' disk, etc.).
' (2) Reuse all the above functionality on different forms - particularly
' useful for handling NewWindow2. 

Imports mshtml
Imports System.Resources

Public Class WebOCHostCtrl
    Inherits System.Windows.Forms.UserControl

    ' Expose WebBrowser events so that clients can sink them simply and 
    ' directly, without exposing the underlying control.
    Public Event CommandStateChange(ByVal Sender As Object, ByVal E As AxSHDocVw.DWebBrowserEvents2_CommandStateChangeEvent)
    Public Event EnableBack(ByVal Sender As Object, ByVal E As System.EventArgs)
    Public Event DisableBack(ByVal Sender As Object, ByVal E As System.EventArgs)
    Public Event EnableForward(ByVal Sender As Object, ByVal E As System.EventArgs)
    Public Event DisableForward(ByVal Sender As Object, ByVal E As System.EventArgs)
    Public Event StatusTextChange(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_StatusTextChangeEvent)
    Public Event DocumentComplete(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_DocumentCompleteEvent)
    Public Event TopLevelNavigateComplete2(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_NavigateComplete2Event)

    ' Instance data.
    Private enableCtxMenu As Boolean

    ' The current instance of MSHTML.
    Private WithEvents doc As HtmlDocument

    ' The GUID we need to invoke FInd, View Source and Options on
    ' WebBrowser. Note that the second param is in its two complement
    ' representation because the number otherwise outstrips the size
    ' of a VB short.
    'Private cmdGUID As New Guid(&HED016940, -17061, &H11CF, &HBA, &H4E, &H0, &HC0, &H4F, &HD7, &H8, &H16)

    ' Constants for the above-named commands
    Private Enum MiscCommandTarget
        Find = 1
        ViewSource
        Options
    End Enum

    ' Constants for regular OLECMDID command targets.


    ' Constants for forward/back testing.
    Enum CommandState
        UpdateCommands = -1
        Forward = 1
        Back = 2
    End Enum

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

        ' Load resources.
        rm = New ResourceManager("WebOCHostCtrl", System.Reflection.Assembly.GetExecutingAssembly())
    End Sub

    'UserControl overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If

            rm = Nothing
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents webBrowser As AxSHDocVw.AxWebBrowser
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(WebOCHostCtrl))
        Me.webBrowser = New AxSHDocVw.AxWebBrowser()
        CType(Me.webBrowser, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'webBrowser
        '
        Me.webBrowser.Anchor = (((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
                    Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.webBrowser.Enabled = True
        Me.webBrowser.OcxState = CType(resources.GetObject("webBrowser.OcxState"), System.Windows.Forms.AxHost.State)
        Me.webBrowser.Size = New System.Drawing.Size(616, 320)
        Me.webBrowser.TabIndex = 0
        '
        'WebOCHostCtrl
        '
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.webBrowser})
        Me.Name = "WebOCHostCtrl"
        Me.Size = New System.Drawing.Size(616, 320)
        CType(Me.webBrowser, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    '
    ' PRIVATE INSTANCE VARIABLES
    ' 
    Private rm As ResourceManager

    '
    ' PROPERTIES
    ' 

    ' Obtain a reference to the hosted HTML document. 
    Public ReadOnly Property HtmlDocument() As mshtml.HTMLDocument
        Get
            Dim doc As HTMLDocument
            Try
                doc = CType(webBrowser.Document, mshtml.HTMLDocument)
            Catch
                Throw (New Exception(rm.GetString("Err_HtmlDocumentNotReady")))
            End Try

            HtmlDocument = doc
        End Get
    End Property

    ' 
    ' METHODS
    ' 

    ' Define a simple Navigate to handle most navigation circumstances.
    Public Overloads Sub Navigate(ByVal url As String)
        Dim o As New Object()

        webBrowser.Navigate(url, o, o, o, o)
    End Sub

    Public Overloads Sub Navigate(ByVal url As String, ByVal o As Object)

    End Sub

    ' Print a document, telling the WebBrowser whether or not to display
    ' the UI. MSHTML exposes a method to print as well, but we want these
    ' semantics to work for any document server (Word, Excel, etc.), so we
    ' perform the op against the doc host instead.
    Public Sub Print(ByVal doUI As Boolean)
        'Dim doOpt As SHDocVw.OLECMDEXECOPT

        'If doUI Then
        '    doOpt = SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_PROMPTUSER
        'Else
        '    doOpt = SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_PROMPTUSER
        'End If

        'webBrowser.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINT, doOpt)
    End Sub

    ' Print a document using an MSHTML Print Template.
    Public Sub PrintFormatted(ByVal tmplPath As String)
        'Dim o As New Object()

        'webBrowser.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINT, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, CType(tmplPath, Object), o)
    End Sub

    ' Easy commands to test copy/cut/paste status of the control.
    Public Function IsCutEnabled() As Boolean
        'Dim res As SHDocVw.OLECMDF = webBrowser.QueryStatusWB(SHDocVw.OLECMDID.OLECMDID_CUT)
        'If (res And SHDocVw.OLECMDF.OLECMDF_ENABLED) = SHDocVw.OLECMDF.OLECMDF_ENABLED Then
        '    IsCutEnabled = True
        'Else
        '    IsCutEnabled = False
        'End If
    End Function

    Public Function IsCopyEnabled() As Boolean
        'Dim res As SHDocVw.OLECMDF = webBrowser.QueryStatusWB(SHDocVw.OLECMDID.OLECMDID_COPY)
        'If (res And SHDocVw.OLECMDF.OLECMDF_ENABLED) = SHDocVw.OLECMDF.OLECMDF_ENABLED Then
        '    IsCopyEnabled = True
        'Else
        '    IsCopyEnabled = False
        'End If
    End Function

    Public Function IsPasteEnabled() As Boolean
        'Dim qVal As SHDocVw.OLECMDF = webBrowser.QueryStatusWB(SHDocVw.OLECMDID.OLECMDID_PASTE)
        'Dim i As Integer
        'If (qVal And SHDocVw.OLECMDF.OLECMDF_ENABLED) = SHDocVw.OLECMDF.OLECMDF_ENABLED Then
        '    IsPasteEnabled = True
        'Else
        '    IsPasteEnabled = False
        'End If
    End Function

    ' View the source of the current HTML page in Notepad.
    Public Sub ViewSource()
        Dim cmdt As IOleCommandTarget
        Dim o As Object

        ' If the doc object isn't set to anything, or there's
        ' some bizarre error in accessing IOleCommandTarget,
        ' exit gracefully.
        Try
            cmdt = CType(doc, IOleCommandTarget)
            'cmdt.Exec(cmdGUID, MiscCommandTarget.ViewSource, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DODEFAULT, o, o)
        Catch
            Throw (New Exception(Err.GetException().Message))
        End Try
    End Sub

    Public Sub Find()
        Dim cmdt As IOleCommandTarget
        Dim o As Object

        ' If the doc object isn't set to anything, or there's
        ' some bizarre error in accessing IOleCommandTarget,
        ' exit gracefully.
        Try
            cmdt = CType(doc, IOleCommandTarget)
            'cmdt.Exec(cmdGUID, MiscCommandTarget.Find, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DODEFAULT, o, o)
        Catch
            Throw (New Exception(Err.GetException().Message))
        End Try
    End Sub

    Public Sub InternetOptions()
        Dim cmdt As IOleCommandTarget
        Dim o As Object

        ' If the doc object isn't set to anything, or there's
        ' some bizarre error in accessing IOleCommandTarget,
        ' exit gracefully.
        Try
            cmdt = CType(doc, IOleCommandTarget)
            'cmdt.Exec(cmdGUID, MiscCommandTarget.Options, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DODEFAULT, o, o)
        Catch
            ' Throw (New Exception(Err.GetException().Message))
        End Try
    End Sub

    ' Enable or disable IE's context menu? This allows the parent host
    ' to render its own.
    Public Property BrowserContextMenu() As Boolean
        Get
            BrowserContextMenu = enableCtxMenu
        End Get
        Set(ByVal Value As Boolean)
            ' Disable it. Note that we'll need to do this for each
            ' page navigation, as the event sink is specific to an 
            ' instance of MSHTML.
            If (True = Value) Then
                DisableContextMenu()
            Else
                EnableContextMenu()
            End If

            enableCtxMenu = Value
        End Set
    End Property

    ' Some simple thunks
    Public Sub GoBack()
        webBrowser.GoBack()
    End Sub

    Public Sub GoForward()
        webBrowser.GoForward()
    End Sub

    Public Sub GoHome()
        webBrowser.GoHome()
    End Sub

    ' Cut/copy/paste methods.
    Public Sub Cut()
        'webBrowser.ExecWB(SHDocVw.OLECMDID.OLECMDID_CUT, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER)
    End Sub

    Public Sub Copy()
        'webBrowser.ExecWB(SHDocVw.OLECMDID.OLECMDID_COPY, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER)
    End Sub

    Public Sub Paste()
        'webBrowser.ExecWB(SHDocVw.OLECMDID.OLECMDID_PASTE, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER)
    End Sub

    ' 
    ' PRIVATE METHODS
    '
    Public Sub DisableContextMenu()

    End Sub

    Public Sub EnableContextMenu()

    End Sub

    ' Multiplex this event, so that hosts don't have to fuss with
    ' the CSC_ values or repeat this logic for every hosted
    ' instance.
    Private Sub webBrowser_CommandStateChange(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_CommandStateChangeEvent) Handles WebBrowser.CommandStateChange
        If CommandState.Back = e.command Then
            If True = e.enable Then
                RaiseEvent EnableBack(sender, New System.EventArgs())
            Else
                RaiseEvent DisableBack(sender, New System.EventArgs())
            End If
        ElseIf CommandState.Forward = e.command Then
            If True = e.enable Then
                RaiseEvent EnableForward(sender, New System.EventArgs())
            Else
                RaiseEvent DisableForward(sender, New System.EventArgs())
            End If
        Else
            RaiseEvent CommandStateChange(sender, e)
        End If
    End Sub

    ' Perform per-document init tasks.
    Private Sub webBrowser_DocumentComplete(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_DocumentCompleteEvent) Handles WebBrowser.DocumentComplete
        Try
            doc = CType(webBrowser.Document, mshtml.HTMLDocument)
        Catch
            ' Not a fatal error - we might be hosting a Word doc in-place,
            ' e.g.
        End Try

        ' Bubble up to our host.
        RaiseEvent DocumentComplete(sender, e)
    End Sub

    'Sink the event and raise it to the container. 
    Private Sub webBrowser_StatusTextChange(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_StatusTextChangeEvent) Handles WebBrowser.StatusTextChange
        RaiseEvent StatusTextChange(sender, e)
    End Sub

    Private Sub webBrowser_TopLevelNavigateComplete2(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_NavigateComplete2Event) Handles WebBrowser.NavigateComplete2
        If (webBrowser.LocationURL).Equals(Convert.ToString(e.uRL)) Then
            RaiseEvent TopLevelNavigateComplete2(sender, e)
        End If
    End Sub
End Class