Rick,
Nikit Zykov had a fine "mini book" that was originally published on C#
Today called "Programmin g Internet Explorer in C#". I am not sure you can
still get hold of it because of all the Wrox stuff in the last year or so,
but if you haven't seen it, I recommend it highly.
Zykov's implementation snippet (greatly simplified, but usable nonetheless)
follows:
=============== =============== =============== ======
Create a handler class able to give us access to the DHTML event object
interface that we need in order to access to some supplemental information
about the event we're managing, like mouse click coordinates or the event
source object. You can get the event property of the window object attached
to the document. Extend your DHTMLDoc class by adding a new Event property
to it:
public IHTMLEventObj Event
{
get{ return doc2.parentWind ow.@event; }
}
Now you can create a new fully functional DHTMLEventHandl er class and a
corresponding delegate
public delegate void DHTMLEvent(IHTM LEventObj e);
public class DHTMLEventHandl er
{
public DHTMLEventHandl er(DHTMLDoc doc)
{
document=doc;
}
[DispId(0)]
public void Call()
{
Handler(documen t.Event);
}
public DHTMLEvent Handler;
DHTMLDoc document;
}
Now create a new DHTMLElement class to allow you to encapsulate the generic
DHTML element functionality.
The first bit will be event handling. In the code below, we implement the
onclick event template:
public class DHTMLElement
{
public DHTMLElement(DH TMLDoc d,object e)
{
if(!(e is IHTMLElement))t hrow new Exception("This is not a DHTML
element!");
doc=d;
elm=(IHTMLEleme nt)e;
}
public event DHTMLEvent onClick
{
add
{
object old=elm.onclick ;
DHTMLEventHandl er h;
if(old.GetType( )==typeof(DHTML EventHandler))h =((DHTMLEventHa ndler)old);
else elm.onclick=h=n ew DHTMLEventHandl er(doc);
h.Handler+=valu e;
}
remove
{
object old=elm.onclick ;
if(old.GetType( )==typeof(DHTML EventHandler))
((DHTMLEventHan dler)old).Handl er-=value;
}
}
IHTMLElement elm;
DHTMLDoc doc;
}
You can do copy-and-paste to create other events handlers; the only
additional work you'll probably have to do concerns querying for special
interfaces for the events that don't concern all the DHTML element types
(like onclick).
Once this work is done, you can add an event handler to any DHTML element by
using only two lines of code, like with DHTML except that in our case, you
are sure it works and you can share one delegate type for all your events.
To give you an example, we'll create the following handler in our Form1
class:
private void DHTMLEvtClick(I HTMLEventObj e)
{
MessageBox.Show ("Click detected at: "+e.x+"/"+e.y,"C# event handler");
}
To attach this to the event, just add these two lines to your
DocumentComplet e handler:
DHTMLElement elm=new DHTMLElement(do c,doc["text1"]);
elm.onClick+=ne w DHTMLEvent(DHTM LEvtClick);
Hope this help!
Peter
"Rick Strahl [MVP]" <ri********@hot mail.com> wrote in message
news:Oa******** ******@TK2MSFTN GP10.phx.gbl...
I'm working on an app that's using the WebBrowser control.
I got the control working fine, hooking to the document object. But I've
run into a major issue with hooking the Document events. Whenever I hook any
of the HTMLDocumnetEve nt2_Event events like this:
HTMLDocumentEve nts2_Event DocEvents = this.Browser.Do cument as
HTMLDocumentEve nts2_Event ;
DocEvents.oncon textmenu += new
HTMLDocumentEve nts2_oncontextm enuEventHandler (Browser_Contex tMenu);
the browser document becomes unresposinve. The events fire fine and the
Document otherwise works - links highlight, status events fire and I can
select linsk with the keyboard. But all mouse clicks are eaten.
It doesn't matter which event I hook - just to verify I used the onhelp
event instead of one that hooks mouse events. As soon as the event gets
hooked up the mouse clicks die. Take it out - all is well (well within
reason).
Any ideas?
+++ Rick ---
--
Rick Strahl
West Wind Technologies
http://www.west-wind.com/
http://www.west-wind.com/weblog/
----------------------------------
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