I'm writing a program that is designed for quick navigation using
specific buttons on the keyboard. In doing this, I have added a
KeyPress event for every control on the form to intercept the key
pressed and pass it to a standard subroutine that identifies what
action should be taken.
Unfortunately, I have a web-browser contol on the form and the
webbrowser does not include a KeyPress event.
I need some way to intercept keypress and mousedown events for the
webbrowser - my thought was to put a control that has these events on
top of the webbrowser, but I have been unable to find a control that
can be transparent while also sitting on top of a webbrowser - the
imagebox control will be transparent, but for some reason it always
falls behind the webbrowser even when I force it to the Front.
my second thought is to trap key press and mouse click events from
within the html pages I am showing in the webbrowser and then passing
them along to vb - but I don't have the slightest clue how to do that,
or even if it can be done.
Does anyone have any ideas on a soltion to this problem?
any help would be appreciated.
thanks.
Trevor Fairchild
12  24190 
Actually I'd never even heard of KeyPreview. It makes my code a lot
more compact, but unfortunately, after some testing, it does not
affect keypress events when the webbrowser is in focus.
For the moment, I have trapped the Got Focus event of the webbrowser,
redirecting it to another control, but this only works if the user
left-clicks in the webbrowser; a right-click sends commands to the
webbrowser than I cannot hijack back to VB6.
I've got some VBScript that is written into the html page that
disables the drop-down menu that you'd normally get in a web page.
The only workaround I can think of is to put a msgbox command in the
VBScript function alerting the user that he/she will have to click
elsewhere in the form in order to use the hot keys again. er*****@nowhere .com (J French) wrote in message news:<40******* *******@news.bt click.com>... On 2 Feb 2004 08:33:48 -0800, MR*******@e-crime.on.ca (Trevor
Fairchild) wrote:
Have you tried Form.KeyPreview ?
On 3 Feb 2004 05:28:44 -0800, MR*******@e-crime.on.ca (Trevor
Fairchild) wrote: Actually I'd never even heard of KeyPreview. It makes my code a lot
more compact, but unfortunately, after some testing, it does not
affect keypress events when the webbrowser is in focus.
For the moment, I have trapped the Got Focus event of the webbrowser,
redirecting it to another control, but this only works if the user
left-clicks in the webbrowser; a right-click sends commands to the
webbrowser than I cannot hijack back to VB6.
I've got some VBScript that is written into the html page that
disables the drop-down menu that you'd normally get in a web page.
The only workaround I can think of is to put a msgbox command in the
VBScript function alerting the user that he/she will have to click
elsewhere in the form in order to use the hot keys again.
That sounds horrible
I don't use the MS webbrowser control so my suggestions can only be
'theoretical'
It sounds as if you do not particularly want the Webbrowser to have
focus ... so you could grab it back using its GotFocus event
- or even a Timer
Assuming you are using Microsoft Internet Controls - WebBrowser1
- it looks as if it steals certain keys /before/ the Form gets them in
the KeyDown Event
- [F5] and Chr$(8) for a start
And annoyinly my version of that control does not have any KeyDown
event
- shifting Focus away from it in the GotFocus event is pretty brutal
- but that might be a solution
Do you really want people to click on the HTML viewer ?
- it sounds not, but I can't be sure
Form.KeyPreview should do exactly what it says on the box
The simple answer is no, I don't want anyone to bother clicking in the
webbrowser, but there's no way for me to actually prevent them from
doing this.
I have already set the WebBrowser1.Got Focus event to automatically
bounce the focus to another control that will handle the keypress
events properly. Unfortunately, this only works if the user
LEFT-clicks with the mouse. a right click sends commands to the
webbrowser itself that supercedes the GotFocus event, for some reason.
I had also thought of the timer, but am concerned about the
performance costs for such a workaround to the subject. The program
is designed for a very fast series of key-press events to cycle
through content of a database (one time trial had me going through
3,000 records in an hour), and as such I'd have to have the timer set
to a pretty high pace in order to make the re-setting of focus
unnoticed by the user - all that for a relatively unlikely, but not
impossible situation.
I have a very simple VBscript function that is hard-coded in the html
pages, that prevents users from right-clicking the html page to get
the standard IE6 options, like view source and Save Picture as, so I
can enter code in that function to inform the user he/she will have to
click somewhere else on the form to use the hot keys again, but that
is kind of hokey and not very professional.
Unforutnately, there isn't even an Enabled or Locked property for the
webbrowser.
That's why I was hoping there was some way of superimposing another
control overtop of the webbrowser - something that could be invisible
but still hijack all attempts to click on the browser.
On 3 Feb 2004 13:17:40 -0800, MR*******@e-crime.on.ca (Trevor
Fairchild) wrote:
<snip> Unforutnatel y, there isn't even an Enabled or Locked property for the
webbrowser.
That's why I was hoping there was some way of superimposing another
control overtop of the webbrowser - something that could be invisible
but still hijack all attempts to click on the browser.
Hah !
I thought this might be the case
Stick the WebBrowser on a Frame
- and disable the Frame
mwahahahaha, that did it, thanks!
mwahahaha that did it, thanks!
On 3 Feb 2004 13:17:40 -0800, MRTrevorF@e-crime.on.ca (Trevor
Fairchild) wrote:
<snip>
[color=blue]
>Unforutnatel y, there isn't even an Enabled or Locked property for the
>webbrowser.
>
>That's why I was hoping there was some way of superimposing another
>control overtop of the webbrowser - something that could be invisible
>but still hijack all attempts to click on the browser.[/color]
Hah !
I thought this might be the case
Stick the WebBrowser on a Frame
- and disable the Frame
The problem then is that the browser won't react to key up / down, and that it's scrollbars won't work...
With VB and the IE browser control, you can use a div that is *transparent* and position absolute (adjust z-index as needed) ... either set its width and height to 0 px, place off the visible area, or its z-index to 0 behind everything else; choose which ever you prefer for initial position / state.
Next, create a function in your web page to lock out the user by adjusting the div so that it is in front of everything else (I used a div the size of my page and set its z-index to 3 -- use what works for you). Resize if needed ...
When you want to lock the page, call this lock out function from VB like this:
WebBrowser1.Doc ument.parentWin dow.execScript( "SetLock()" , "JavaScript ")
All left clicks now hit the div and will not affect anything behind it ... Use this html code to block right clicks:
<HTML oncontextmenu=" return false;">
(tested with VB6 and IE6 ... NOTE: users can still select text)
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