16th March 07:10
A serious challenge for a C++ guru
Microsoft very kindly make available a DLL (the browser helper DLL)
which allows you to trap and disable the context menu (right mouse
click) and various 'built-in' browser accelerators (such as ctrl+P
which brings up the print dialogue, and F5, which will refresh the
This is great, and I am duly grateful. However, using the helper DLL
does have a strange side-effect which is annoying our users, and if
anyone has an explanation, I'd be grateful.
What happens is this. If you have any contenteditable fields in your
page (and we have a *lot* of them
<span contenteditable>some editable stuff</span>
and you host this page inside Visual Basic using the standard browser
then without the browser helper DLL attached to the page you can press
the left mouse button and 'sweep' over the text to highlight it. This
is of course a standard piece of Windows behaviour.
Now attach the helper DLL. Now, you can no longer sweep across and
highlight text. Instead, nothing happens.
However, the keyboard still allows this e.g you can press HOME and
CTRL+END to highlight text.
I have tried running up Spy++ to see if somehow there's something
weird going on with message handling but can't pin it down. The DLL
source code doesn't seem to be screwing around with messages it didn't
ought to be handling.
Can anyone suggest a way of pinning down this rather strange problem?.