MiNiWebブラウザのコアテクノロジの詳細

         ///<summary>

        /// Returns the automation object for the web browser

        ///</summary>

        public object Application

        {

            get { return axIWebBrowser2.Application; }

        }

/// <summary>

/// An extended version of the <see cref="WebBrowser"/> control.

/// </summary>    

public class extendedwebbrowser : system.windows.forms.webbrowser

{

  //   (MORE CODE HERE)

 

 SYSTEM.WINDOWS.FORMS.AXHOST.CONNECTIONPOINTCOOKIE COOKIE;

 WEBBROWSEREXTENDEDEVENTS EVENTS;

 

  /// <SUMMARY>

 /// THIS METHOD WILL BE CALLED TO GIVE

 /// YOU A CHANCE TO CREATE YOUR OWN EVENT SINK

 /// </SUMMARY>

 [PERMISSIONSET(SECURITYACTION.LINKDEMAND, NAME = "FULLTRUST")]

 PROTECTED OVERRIDE VOID CREATESINK()

 {

   // MAKE SURE TO CALL THE BASE CLASS OR THE NORMAL EVENTS WON'T FIRE

   BASE.CREATESINK();

   EVENTS = NEW WEBBROWSEREXTENDEDEVENTS(THIS);

   COOKIE = NEW AXHOST.CONNECTIONPOINTCOOKIE(THIS.ACTIVEXINSTANCE, 

                     EVENTS, TYPEOF(UNSAFENATIVEMETHODS.DWEBBROWSEREVENTS2));

 }

 

  /// <SUMMARY>

 /// DETACHES THE EVENT SINK

 /// </SUMMARY>

 [PERMISSIONSET(SECURITYACTION.LINKDEMAND, NAME = "FULLTRUST")]

 PROTECTED OVERRIDE VOID DETACHSINK()

  {

   IF (NULL != COOKIE)

       {

        COOKIE.DISCONNECT();

        COOKIE = NULL;

   }

 }

 

  /// <SUMMARY>

 /// FIRES WHEN DOWNLOADING OF A DOCUMENT BEGINS

 /// </SUMMARY>

 PUBLIC EVENT EVENTHANDLER DOWNLOADING;

 

  /// <SUMMARY>

 /// RAISES THE <SEE CREF="DOWNLOADING"/> EVENT

 /// </SUMMARY>

 /// <PARAM NAME="E">EMPTY <SEE CREF="EVENTARGS"/></PARAM>

 /// <REMARKS>

 /// YOU COULD START AN ANIMATION

 /// OR A NOTIFICATION THAT DOWNLOADING IS STARTING

 /// </REMARKS>

 PROTECTED VOID ONDOWNLOADING(EVENTARGS E)

  {

   IF (DOWNLOADING != NULL)

        DOWNLOADING(THIS, E);

 }

 

 //   (MORE CODE HERE)

 

  THE IMPLEMENTATION OF DWEBBROWSEREVENTS2 FOR FIRING EXTRA EVENTS
}

public partial class browsercontrol : usercontrol
    {

     public browsercontrol()

      {

       initializecomponent();

       _browser = new extendedwebbrowser();

       _browser.dock = dockstyle.fill;

 

       // here's the new downloadcomplete event

       _browser.downloadcomplete += 

         new eventhandler(_browser_downloadcomplete);

       // some more code here 

       this.containerpanel.controls.add(_browser);

       // some more code here 

     }

 

 

     void _browser_downloadcomplete(object sender, eventargs e)

      {

       // check wheter the document is available (it should be)

       if (this.webbrowser.document != null)

         // subscribe to the error event

         this.webbrowser.document.window.error += 

           new htmlelementerroreventhandler(window_error);

     }

 

     void window_error(object sender, htmlelementerroreventargs e)

      {

       // we got a script error, record it

       scripterrormanager.instance.registerscripterror(e.url, 

                                e.description, e.linenumber);

       // let the browser know we handled this error.

       e.handled = true;

     }

 

     // some more code here

   }

void _browser_startnewwindow(object sender, 

 browserextendednavigatingeventargs e)

  {

   // here we do the pop-up blocker work

 

   // note that in windows 2000 or lower this event will fire, but the

   // event arguments will not contain any useful information

   // for blocking pop-ups.

 

   // there are 4 filter levels.

   // none: allow all pop-ups

   // low: allow pop-ups from secure sites

   // medium: block most pop-ups

   // high: block all pop-ups (use ctrl to override)

 

   // we need the instance of the main form,

   // because this holds the instance

   // to the windowmanager.

   mainform mf = getmainformfromcontrol(sender as control);

   if (mf == null)

     return;

 

   // allow a popup when there is no information

   // available or when the ctrl key is pressed

   bool allowpopup = (e.navigationcontext == urlcontext.none) 

        || ((e.navigationcontext & 

        urlcontext.overridekey) == urlcontext.overridekey);

 

   if (!allowpopup)

    {

     // give none, low & medium still a chance.

     switch (settingshelper.current.filterlevel)

      {

       case popupblockerfilterlevel.none:

         allowpopup = true;

         break;

       case popupblockerfilterlevel.low:

         // see if this is a secure site

         if (this.webbrowser.encryptionlevel != 

                  webbrowserencryptionlevel.insecure)

           allowpopup = true;

         else

           // not a secure site, handle this like the medium filter

           goto case popupblockerfilterlevel.medium;

         break;

       case popupblockerfilterlevel.medium:

         // this is the most dificult one.

         // only when the user first inited

         // and the new window is user inited

         if ((e.navigationcontext & urlcontext.userfirstinited) 

              == urlcontext.userfirstinited && 

              (e.navigationcontext & urlcontext.userinited) 

              == urlcontext.userinited)

           allowpopup = true;

         break;

     }

   }

 

   if (allowpopup)

    {

     // check wheter it's a html dialog box.

     // if so, allow the popup but do not open a new tab

     if (!((e.navigationcontext & 

            urlcontext.htmldialog) == urlcontext.htmldialog))

      {

       extendedwebbrowser ewb = mf.windowmanager.new(false);

       // the (in)famous application object

       e.automationobject = ewb.application;

     }

   }

   else

     // here you could notify the user that the pop-up was blocked

     e.cancel = true;

 }